Candel Therapeutics, Inc. (CADL)

CIK: 0001841387. SIC: 2836 Biological Products, (No Diagnostic Substances). Latest 10-K as of: 2026-03-12.

SIC breadcrumb: Manufacturing > Chemicals And Allied Products > SIC 2836 Biological Products, (No Diagnostic Substances)

SEC company page: https://www.sec.gov/edgar/browse/?CIK=1841387. Latest filing source: 0001193125-26-103134.

Selected Fundamentals

Financials

Annual standardized facts from SEC companyfacts as of latest extracted filing date 2026-03-12. Source: https://data.sec.gov/api/xbrl/companyfacts/CIK0001841387.json. Derived margins, ratios, and free cash flow are computed from the extracted annual SEC facts.

Flow metrics use full-year FY periods from 10-K/10-K/A filings; balance-sheet metrics use FY-end instants. Free cash flow = operating cash flow - capital expenditures. Missing metrics are omitted rather than fabricated.

Ratios

ROE and ROA use period-end equity/assets. Liabilities / equity uses total liabilities divided by stockholders' equity. Current ratio uses current assets divided by current liabilities when both are reported.

Financial Charts

Quarterly

Quarterly standardized facts from SEC companyfacts as of latest extracted filing date 2026-05-14. Source: https://data.sec.gov/api/xbrl/companyfacts/CIK0001841387.json.

Flow metrics use discrete quarter-length periods from 10-Q/10-Q/A filings. Q4 revenue and net income are derived only when annual FY and nine-month YTD facts exist for the same fiscal year; derived Q4 values are labeled. EPS Q4 is not derived.

Quarterly Charts

Macro Cross-References

• CPIAUCSL - Consumer Price Index for All Urban Consumers: All Items in U.S. City Average
• UNRATE - Unemployment Rate
• FEDFUNDS - Federal Funds Effective Rate
• CES0500000003 - Average Hourly Earnings of All Employees, Total Private
• DFEDTARU - Federal Funds Target Range - Upper Limit
• DFEDTARL - Federal Funds Target Range - Lower Limit
• DGS3MO - Market Yield on U.S. Treasury Securities at 3-Month Constant Maturity
• DGS2 - Market Yield on U.S. Treasury Securities at 2-Year Constant Maturity
• DGS10 - Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity
• DGS30 - Market Yield on U.S. Treasury Securities at 30-Year Constant Maturity
• T10Y2Y - 10-Year Treasury Constant Maturity Minus 2-Year Treasury Constant Maturity
• CPILFESL - Consumer Price Index for All Urban Consumers: All Items Less Food and Energy
• CPIUFDSL - Consumer Price Index for All Urban Consumers: Food
• CPIENGSL - Consumer Price Index for All Urban Consumers: Energy
• CUSR0000SAH1 - Consumer Price Index for All Urban Consumers: Shelter
• PCEPI - Personal Consumption Expenditures: Chain-type Price Index
• PCEPILFE - Personal Consumption Expenditures Excluding Food and Energy: Chain-type Price Index
• PPIACO - Producer Price Index by Commodity: All Commodities
• T10YIE - 10-Year Breakeven Inflation Rate
• U6RATE - Total Unemployed, Plus All Marginally Attached Workers Plus Total Employed Part Time for Economic Reasons
• PAYEMS - All Employees, Total Nonfarm
• CIVPART - Labor Force Participation Rate
• EMRATIO - Employment-Population Ratio
• UNEMPLOY - Unemployed
• CE16OV - Employment Level
• ICSA - Initial Claims
• JTSJOL - Job Openings: Total Nonfarm
• JTSQUR - Quits: Total Nonfarm
• GDPC1 - Real Gross Domestic Product
• A191RL1Q225SBEA - Real Gross Domestic Product: Percent Change from Preceding Period
• INDPRO - Industrial Production: Total Index
• TCU - Capacity Utilization: Total Index
• HOUST - New Privately-Owned Housing Units Started: Total Units
• PERMIT - New Privately-Owned Housing Units Authorized in Permit-Issuing Places: Total Units
• RSAFS - Advance Retail Sales: Retail Trade
• PCE - Personal Consumption Expenditures
• DSPIC96 - Real Disposable Personal Income
• PSAVERT - Personal Saving Rate
• M2SL - M2
• BOPGSTB - U.S. International Trade in Goods and Services: Balance
• MSPUS - Median Sales Price of Houses Sold for the United States
• HSN1F - New One Family Houses Sold: United States
• RHORUSQ156N - Homeownership Rate in the United States
• TTLCONS - Total Construction Spending: Total Construction in the United States
• RRVRUSQ156N - Rental Vacancy Rate in the United States
• TOTALSL - Total Consumer Credit Owned and Securitized
• REVOLSL - Revolving Consumer Credit Owned and Securitized
• DRCCLACBS - Delinquency Rate on Credit Card Loans, All Commercial Banks
• GDP - Gross Domestic Product
• GPDI - Gross Private Domestic Investment
• GCE - Government Consumption Expenditures and Gross Investment
• PCEC - Personal Consumption Expenditures
• NETEXP - Net Exports of Goods and Services
• GFDEBTN - Federal Debt: Total Public Debt
• GFDEGDQ188S - Federal Debt: Total Public Debt as Percent of Gross Domestic Product
• FYFSD - Federal Surplus or Deficit
• FGRECPT - Federal Government Current Receipts
• FGEXPND - Federal Government: Current Expenditures
• MANEMP - All Employees, Manufacturing
• USCONS - All Employees, Construction
• USTRADE - All Employees, Retail Trade
• USFIRE - All Employees, Financial Activities
• USGOVT - All Employees, Government
• AWHAETP - Average Weekly Hours of All Employees, Total Private
• DGORDER - Manufacturers' New Orders: Durable Goods
• NEWORDER - Manufacturers' New Orders: Nondefense Capital Goods Excluding Aircraft
• BUSINV - Total Business Inventories
• EXPGS - Exports of Goods and Services
• IMPGS - Imports of Goods and Services
• IR - Import Price Index (End Use): All Commodities
• PPIFIS - Producer Price Index by Commodity: Final Demand

Latest quarter (10-Q)

Latest 10-Q source: 0001193125-26-222904.

Extracted structurally from real Item 2 body heading to real Item 3/4 boundary. Confidence: high. Filing date: 2026-05-14. Report date: 2026-03-31.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

You should read the following discussion and analysis of our financial condition and results of operations together with our condensed consolidated financial statements and the related notes and other financial information included elsewhere in this Quarterly Report on Form 10-Q (Form 10-Q). Some of the information contained in this discussion and analysis contains forward-looking statements that involve risks and uncertainties. You should review the section titled “Risk factors” in this Form 10-Q for a discussion of important factors that could cause actual results to differ materially from the results described below.

Overview

We are a clinical stage biopharmaceutical company focused on developing off-the-shelf viral immunotherapies that elicit an individualized, systemic anti-tumor immune response to help patients fight cancer. Our engineered viruses are designed to induce a systemic anti-tumor response due to induction of immunogenic cell death within the tumor microenvironment, thus releasing tumor neo-antigens and creating a pro-inflammatory microenvironment at the site of injection. This is intended to lead to in-situ immunization against the injected tumor and uninjected distant metastases. Local administration is designed to achieve these therapeutic effects while minimizing systemic exposure and associated toxicity.

The immune cells induced by these viral immunotherapies are believed to target patients’ specific tumor antigens, potentially enhancing anti-tumor immune activity in immunologically “hot” tumors while at the same time infiltrating the tumor microenvironment, transforming non-inflamed “cold” tumors with limited immune response into “hot” tumors. While our product candidates are administered directly into the tumor, we have observed systemic immune responses in our preclinical studies and clinical trials that may indicate the potential of our product candidates to induce systemic immune response against distal, uninjected tumors, also known as an “abscopal” effect.

We believe viral immunotherapy is among the most promising cancer treatment modalities today. Our goal is to further improve patient outcomes through viral immunotherapies by selecting the optimal vector, specific transgenes and clinical indications for each tumor type while optimizing product candidate attributes, such as high-titer formulation, intratumoral administration to induce systemic anti-tumor immunity, and storage conditions that could potentially lower logistical barriers for patients and clinicians.

We have established two clinical off-the-shelf viral immunotherapy platforms based on novel, genetically modified adenovirus and herpes simplex virus (HSV) constructs, respectively.

Our most advanced product candidate, aglatimagene besadenovec (referred to herein as aglatimagene and previously as CAN-2409), is an off-the-shelf engineered adenovirus product candidate, administered in conjunction with the prodrug valacyclovir, and has generated promising clinical activity across a range of solid tumor indications. Aglatimagene is being studied in the following ongoing clinical trials:

•
Prostate Cancer

o
A pivotal phase 3 randomized, double-blind, placebo-controlled clinical trial in the United States under a Special Protocol Assessment (SPA) with the U.S. Food and Drug Administration (FDA) evaluating patients with newly diagnosed, localized prostate cancer who have an intermediate- or high-risk for progression. The FDA granted Fast Track Designation for the use of aglatimagene for the treatment of localized, primary prostate cancer in combination with radiation therapy to improve the local control rate.

o
The primary goal of curative treatment for localized prostate cancer is complete tumor eradication, as outlined by National Comprehensive Cancer Network (NCCN) guidelines. However, up to 30% of intermediate- to high-risk patients experience recurrence despite radical therapy, and salvage treatments often carry significant side effects and limited efficacy. Recurrence at a microscopic level in prostate biopsies beyond two years post-treatment is strongly linked to subsequent biochemical failure, higher rates of metastasis, need for salvage anti-cancer therapies, and prostate cancer-specific mortality after prolonged follow up (10 years) (Singh S et al. Prostate Cancer Prostatic Dis 2021;24:612-622). Studies also show that patients prioritize the perception of being cancer-free and are often willing to risk long-term complications to achieve this. Fear of recurrence remains prevalent, especially after biochemical failure (Hoffman RM et al. Cancer 2003;97:1653-62 ; Jayadevappa R et al. J Clin Oncol 2019;37:964-73; Nilsson R et al. Eur Urol Open Sci 2021;25:44-51). Therefore, this study aimed to assess whether adding aglatimagene plus valacyclovir to standard of care (SoC) radiotherapy could improve disease-free survival (DFS) in patients pursuing curative treatment, a primary endpoint established in the SPA with the FDA. We completed enrollment of this trial in September 2021.

▪
In December 2024, we announced positive topline data from our phase 3 clinical trial (DeWeese TL et al. Lancet Oncology (In press)). This randomized, double-blind, placebo-controlled, multicenter clinical trial enrolled 745 patients (intent to treat population (ITT)) to evaluate the effectiveness and safety of aglatimagene plus prodrug (valacyclovir) viral immunotherapy in combination with SoC external beam radiation therapy to improve DFS in patients with intermediate- to high-risk (single high-risk feature), localized prostate cancer. Patients were randomized 2:1 (496 in aglatimagene+prodrug and 249 in

19

placebo + prodrug). Both arms received standard-of-care external beam radiation therapy (EBRT) +/- short course androgen deprivation therapy (ADT) (≤6 months) and were stratified by NCCN risk group and ADT use. Three intraprostatic injections of aglatimagene (5x10 11vp/2mL) or placebo were administered, each followed by 14 days of prodrug.

▪
The median follow-up time for the recruited population was 50.3 months. The primary outcome measure, DFS, included the evaluation of post-treatment biopsies, performed at two years from the end of radiation, for the microscopic presence of tumor recurrence. Local or systemic recurrence and death from any cause were also part of the primary endpoint.

▪
The study met its primary endpoint, demonstrating a statistically significant improvement in DFS in patients in the aglatimagene arm compared to the placebo arm. Key topline results include:

•
The primary endpoint, as agreed with the FDA under a SPA, was met: statistically significant improvement in DFS for aglatimagene plus radiation therapy (n=496) vs. placebo plus radiation therapy (n=249) (p=0.0155; HR 0.70;95% CI; 0.52 to 0.94). Median DFS was not reached for the aglatimagene treatment arm vs. 86.1 months in the placebo arm.

•
This result was supported by secondary and exploratory endpoints:

o
Statistically significant improvement in prostate cancer-specific DFS (exclusion of non-prostate cancer related deaths) in the aglatimagene arm vs. placebo (p=0.0046; HR 0.62, 95% CI 0.44 to 0.87)

o
Exploratory subset analysis showed that improvement in prostate cancer-specific DFS was observed, independent of the use of short-term ADT and independent of the type of EBRT (conventional EBRT vs. moderate hypofractionated EBRT)

o
Statistically significant increase in the proportion of patients achieving a prostate-specific antigen (PSA) nadir (0.2 ng/ml) in the aglatimagene arm compared to the placebo control arm (67.1% vs. 58.6%, respectively; p=0.0164)

o
Statistically significant increase in the proportion of patients with a pathological complete response in 2-year post-treatment biopsies (80.4% in the aglatimagene arm vs. 63.6% in the control arm; p=0.0015)

▪
Aglatimagene was generally well tolerated. The most common aglatimagene-related adverse events were flu-like symptoms, fever and chills, which were generally mild to moderate in severity and self-limited. There was no increase in serious adverse events after aglatimagene administration vs. placebo.

▪
In May 2025, after submission of these topline data to the FDA, we announced that the FDA granted Regenerative Medicine Advanced Therapy (RMAT) Designation for aglatimagene for the treatment of newly diagnosed, localized prostate cancer in patients with intermediate- to high-risk disease.

▪
In June 2025, the results from the positive phase 3 clinical trial of aglatimagene in patients with intermediate- to high-risk, localized prostate cancer were presented in an oral session at the Annual Meeting of the American Society of Clinical Oncology (ASCO).

▪
In September 2025, we presented subgroup analysis of the phase 3 clinical trial during the Annual Meeting of the American Society for Radiation Oncology (ASTRO). The data demonstrated that the effect of aglatimagene on DFS was independent of the type of radiotherapy used (conventional EBRT vs. moderate hypofractionated EBRT). For moderate EBRT, the hazard ratio (HR) was 0.52 (95% CI: 0.30–0.93), and for conventional EBRT, the HR was 0.76 (95% CI: 0.53–1.07). For prostate cancer-specific DFS, HR in moderate hypofractionated EBRT recipients was 0.54 (95% CI: 0.28-1.03), and for conventional EBRT, the HR was 0.64 (0.43 -0.95). Subgroup analyses of prostate cancer-specific DFS demonstrated that aglatimagene outperformed standard of care across all categories, with HRs ranging from 0.49 in patients with intermediate-risk favorable prostate cancer to 0.69 in patients with high-risk disease.

▪
We expect to announce supportive data on prostate cancer-specific outcomes (prostate cancer-specific DFS, time to biochemical failure, time to metastasis, and time to salvage anti-cancer therapy) after extended follow-up during a plenary oral presentation at the American Urological Association (AUA) 2026 Annual Meeting (Garzotto MG et al.) in May 2026.

▪
In addition, in the third quarter of 2026, we expect to present novel immunological biomarker data in patients with localized prostate cancer.

20

▪
We are in ongoing dialogue with the FDA in preparation for the Company’s anticipated submission of a Biologics License Application (BLA) for aglatimagene in prostate cancer in the fourth quarter of 2026.

o
A phase 2 randomized, double-blind, placebo-controlled clinical trial in the United States evaluating patients with low- to intermediate-risk, localized prostate cancer undergoing active surveillance. We completed enrollment of this trial in May 2019.

▪
In December 2024, we reported that this phase 2 clinical trial of aglatimagene monotherapy in 190 patients with low- to intermediate-risk localized prostate cancer undergoing active surveillance showed a trend toward improvement in time to radical treatment and the percentage of patients achieving negative (prostate cancer-free) biopsies at 1-year post-treatment. However, these differences did not reach statistical significance, which might be explained by 1) the fact that the study was not statistically powered for the primary endpoint (progression-free survival), 2) ~70% of patients had low-risk disease (which makes it more difficult to detect a treatment effect), 3) patients received only 2 administrations of aglatimagene rather than 3 as used in the phase 3 clinical trial described above, and 4) patients did not receive radiotherapy (preclinical models of prostate cancer have shown synergy between aglatimagene and radiotherapy in this specific indication). Aglatimagene was generally well tolerated. The most common aglatimagene-related adverse events were flu-like symptoms, fever and chills, which were generally mild to moderate in severity and self-limited.

o
We have initiated a phase 2a, open-label, multi-center study evaluating biomarkers and biodistribution and shedding o

[Excerpt truncated for page length; source filing is linked above.]

Latest 10-K MD&A

Extracted structurally from real Item 7 body heading to real Item 7A/8 boundary. Confidence: high. Filing date: 2026-03-12. Report date: 2025-12-31.

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

You should read the following discussion and analysis of our financial condition and results of operations together with our consolidated financial statements and the related notes and other financial information included elsewhere in this Annual Report on Form 10-K. Some of the information contained in this discussion and analysis contains forward-looking statements that involve risks and uncertainties. You should review the section titled “Risk factors” in this Annual Report on Form 10-K for a discussion of important factors that could cause actual results to differ materially from the results described below.

Overview

We are a clinical stage biopharmaceutical company focused on developing off-the-shelf viral immunotherapies that elicit an individualized, systemic anti-tumor immune response to help patients fight cancer. Our engineered viruses are designed to induce a systemic anti-tumor response due to induction of immunogenic cell death within the tumor microenvironment, thus releasing tumor neo-antigens and creating a pro-inflammatory microenvironment at the site of injection. This is intended to lead to in-situ immunization against the injected tumor and uninjected distant metastases. Local administration is designed to achieve these therapeutic effects while minimizing systemic exposure and associated toxicity.

The immune cells induced by these viral immunotherapies are believed to target patients’ specific tumor antigens, potentially improving responses in immunologically “hot” tumors while at the same time infiltrating the tumor microenvironment, transforming non-inflamed “cold” tumors with limited immune response into “hot” tumors. While our product candidates are administered directly into the tumor, we have observed systemic immune responses in our preclinical studies and clinical trials that may indicate the potential of our product candidates to induce systemic immune response against distal, uninjected tumors, also known as an “abscopal” effect.

We believe viral immunotherapy is among the most promising cancer treatment modalities today. Our goal is to further improve patient outcomes through viral immunotherapies by selecting the optimal vector, specific transgenes and clinical indications for each tumor type while optimizing product candidate attributes, such as high-titer formulation, intratumoral administration to induce systemic anti-tumor immunity, and storage conditions that could potentially lower logistical barriers for patients and clinicians.

We have established two clinical off-the-shelf viral immunotherapy platforms based on novel, genetically modified adenovirus and herpes simplex virus (HSV) constructs, respectively.

Our most advanced product candidate, aglatimagene besadenovec (referred to herein as aglatimagene and previously as CAN-2409), is an off-the-shelf adenovirus product candidate, administered in conjunction with the prodrug valacyclovir, and has generated promising clinical activity across a range of solid tumor indications. Aglatimagene is being studied in the following ongoing clinical trials:

▪
Prostate Cancer

o
A pivotal phase 3 randomized, double-blind, placebo-controlled clinical trial in the United States under a Special Protocol Assessment (SPA) with the U.S. Food and Drug Administration (FDA) evaluating patients with newly diagnosed, localized prostate cancer who have an intermediate- or high-risk for progression. The FDA granted Fast Track Designation for the use of aglatimagene for the treatment of localized, primary prostate cancer in combination with radiation therapy to improve the local control rate.

o
The primary goal of curative treatment for localized prostate cancer is complete tumor eradication, as outlined by National Comprehensive Cancer Network (NCCN) guidelines. However, up to 30% of intermediate- to high-risk patients experience recurrence despite radical therapy, and salvage treatments often carry significant side effects and limited efficacy. Recurrence beyond two years post-treatment is strongly linked to need for salvage anti-cancer therapies, higher rates of metastasis, and prostate cancer-specific mortality after prolonged follow up (10 years). Studies also show that patients prioritize the perception of being cancer-free and are often willing to risk long-term complications to achieve this. Fear of recurrence remains prevalent, especially after biochemical failure (Hoffman RM et al. Cancer 2003;97:1653-62 ; Jayadevappa R et al. J Clin Oncol 2019;37:964-73 ; Nilsson R et al. Eur Urol Open Sci 2021;25:44-51). Therefore, this study aimed to assess whether adding aglatimagene plus valacyclovir to standard of care (SoC) radiotherapy could improve disease-free survival (DFS) in patients pursuing curative treatment, a primary endpoint established in the SPA with the FDA. We completed enrollment of this trial in September 2021.

•
In December 2024, we announced positive topline data from our phase 3 clinical trial. This randomized, double-blind, placebo-controlled, multicenter clinical trial enrolled 745 patients (intent to treat population (ITT)) to evaluate the effectiveness and safety of aglatimagene plus prodrug (valacyclovir) viral immunotherapy in combination with SoC external beam radiation

105

therapy to improve DFS in patients with intermediate- to high-risk (single high-risk feature), localized prostate cancer. Patients were randomized 2:1 (496 in aglatimagene + prodrug and 249 in placebo + prodrug). Both arms received standard of care external beam radiation therapy (EBRT) +/- short course androgen deprivation therapy (ADT) (≤6 months) and were stratified by NCCN risk group and ADT use. Three intraprostatic injections of aglatimagene (5x10 11vp/2mL) or placebo were administered, each followed by 14 days of prodrug. The median follow-up time for the recruited population was 50.3 months. The primary outcome measure, DFS, included the evaluation of post-treatment biopsies, performed at two years from the end of radiation, for the presence of tumor recurrence. Local or systemic recurrence and death from any cause were also part of the primary endpoint.

The study met its primary endpoint, demonstrating a statistically significant improvement in DFS in patients in the aglatimagene arm compared to the placebo arm. Key topline results include:

•
The primary endpoint, as agreed with the FDA under a SPA, was met: statistically significant improvement in DFS for aglatimagene plus radiation therapy (n=496) vs. placebo plus radiation therapy (n=249) (p=0.0155; HR 0.70; 95% CI; 0.52 to 0.94). Median DFS was not reached for the aglatimagene treatment arm vs. 86.1 months in the placebo arm.

•
This result was supported by secondary and exploratory endpoints:

o
Statistically significant improvement in prostate cancer-specific DFS (exclusion of non-prostate cancer related deaths) in the aglatimagene arm vs. placebo (p=0.0046; HR 0.62, 95% CI 0.44 to 0.87)

o
Exploratory subset analysis showed that improvement in prostate cancer-specific DFS was observed, independent of the use of short-term ADT and independent of the type of EBRT (conventional EBRT vs. moderate hypofractionated EBRT)

o
Statistically significant increase in the proportion of patients achieving a prostate-specific antigen (PSA) nadir (0.2 ng/ml) in the aglatimagene arm compared to the placebo control arm (67.1% vs. 58.6%, respectively; p=0.0164)

o
Statistically significant increase in the proportion of patients with a pathological complete response in 2-year post-treatment biopsies (80.4% in the aglatimagene arm vs. 63.6% in the control arm; p=0.0015)

•
Aglatimagene was generally well tolerated. The most common aglatimagene-related adverse events were flu-like symptoms, fever and chills, which were generally mild to moderate in severity and self-limited. There was no increase in serious adverse events after aglatimagene administration vs. placebo.

•
In May 2025, after submission of these topline data to the FDA, we announced that the FDA granted Regenerative Medicine Advanced Therapy (RMAT) Designation for aglatimagene for the treatment of newly diagnosed, localized prostate cancer in patients with intermediate- to high-risk disease.

•
In June 2025, the results from the positive phase 3 clinical trial of aglatimagene in patients with intermediate- to high-risk, localized prostate cancer were presented in an oral session at the Annual Meeting of the American Society of Clinical Oncology (ASCO).

•
In September 2025, we presented subgroup analysis of the phase 3 clinical trial during the Annual Meeting of the American Society for Radiation Oncology (ASTRO). The data demonstrated that the effect of aglatimagene on prostate-specific DFS was independent of the type of radiotherapy used (conventional EBRT vs. moderate hypofractionated EBRT). For moderate EBRT, the hazard ratio (HR) was 0.52 (95% CI: 0.30–0.93), and for conventional EBRT, the HR was 0.76 (95% CI: 0.53–1.07). Subgroup analyses of prostate cancer-specific DFS demonstrated that aglatimagene outperformed standard of care across all categories, with HRs ranging from 0.49 in patients with intermediate-risk favorable prostate cancer to 0.69 in patients with high-risk disease.

•
We expect to announce supportive data on prostate cancer-specific outcomes (prostate cancer-specific DFS, time to salvage anti-cancer therapy, and time to metastasis) after extended follow-up in the second quarter of 2026.

106

•
In addition, in the third quarter of 2026, we expect to present novel immunological biomarker data in patients with localized prostate cancer.

•
We are in ongoing dialogue with the FDA in preparation for the Company’s anticipated submission of a Biologics License Application (BLA) for aglatimagene in prostate cancer in the fourth quarter of 2026.

o
A phase 2 randomized, double-blind, placebo-controlled clinical trial in the United States evaluating patients with low- to intermediate-risk, localized prostate cancer undergoing active surveillance. We completed enrollment of this trial in May 2019.

•
In December 2024, we reported that this phase 2 clinical trial of aglatimagene monotherapy in 190 patients with low- to intermediate-risk, localized prostate cancer undergoing active surveillance showed a trend toward improvement in time to radical treatment and the percentage of patients achieving negative (prostate cancer-free) biopsies at 1-year post-treatment. However, these differences did not reach statistical significance, which might be explained by 1) the fact that the study was not statistically powered for the primary endpoint (progression-free survival), 2) ~70% of patients had low-risk disease (which makes it more difficult to detect a treatment effect), 3) patients received only 2 administrations of aglatimagene rather than 3 as used in the phase 3 clinical trial described above, and 4) patients did not receive radiotherapy (preclinical models of prostate cancer have shown synergy between aglatimagene and radiotherapy in this specific indication). Aglatimagene was generally well tolerated. The most common aglatimagene-related adverse events were flu-like symptoms, fever and chills, which were generally mild to moderate in severity and self-limited.

o
We have initiated a phase 2a, open-label, multi-center study evaluating biomarkers and biodistribution and shedding of aglatimagene plus valacyclovir in men with localized, intermediate-risk prostate cancer who are planning to receive EBRT. The study aims to recruit up to 45 patients (30 in the treatment arm and 15 in the control arm treated with EBRT alone). Biosamples (blood, urine, semen) will be collected at specified timepoints. We anticipate that this data will be submitted as part of the BLA filing in the fourth quarter of 2026.

▪
Non-Small Cell Lung Cancer (NSCLC)

o
An open-label phase 2a clinical trial in the United States evaluating aglatimagene plus valacyclovir in combination with continued PD-(L)1 checkpoint inhibitors in patients with stage III/IV NSCLC who have inadequate response to front line PD-(L)1 checkpoint inhibitor treatments. In April 2023, we announced that the FDA granted Fast Track Designation for aglatimagene plus valacyclovir in combination with pembrolizumab in order to improve survival or delay progression in patients with unresectable stage III or stage IV NSCLC, who are resistant to first line PD-(L)1 inhibitor therapy and who do not have activating molecular driver mutations or have progressed on directed molecular therapy. These patients historically have had an expected median overall survival (mOS) of 12 months when treated with SoC second-line chemotherapy (Reckamp K et al. J Clin Onc 2022;40:2295-2306). The aim of the aglatimagene immunotherapy antitumor strategy is to improve overall survival beyond the median of 12 months in patients treated with two aglatimagene injections and raise the long tail of survival.

o
In March 2025, we announced overall survival data from this phase 2a clinical trial of aglatimagene in NSCLC:

▪
In patients with an inadequate response to immune checkpoint inhibitor (ICI) treatment who received 2 aglatimagene plus valacyclovir courses (Cohort 1+2, per protocol population, n=46), mOS was 24.5 months.

▪
In patients with progressive disease, despite ICI treatment (Cohort 2, per protocol population, n=41), mOS was 21.5 months, which is markedly longer than the 9.8–11.8 months of survival reported in published literature in a similar patient population receiving standard of care of docetaxel second-line chemotherapy (Paz-Ares LG et al, J Clin Oncol 2024;42:2860-2872 ; Ahn MJ et al, J Clin Onc 2024;43:260-272).

▪
37% of patients with progressive disease at enrollment were still alive 24 months after aglatimagene treatment at the time of the March 3, 2025 data cut, suggesting a long tail of survival. 14/15 patients with overall survival 24 months and 9/9 patients with overall survival 30 months had non-squamous NSCLC.

▪
In patients with non-squamous NSCLC and progressive disease despite ICI (Cohort 2, per protocol population, n=33), observed mOS was 25.4 months after aglatimagene treatment.

107

▪
Aglatimagene continued to exhibit a generally favorable safety and tolerability profile during the extended follow-up period.

o
Based on these positive findings, we plan to initiate a pivotal phase 3 clinical trial of aglatimagene in patients with progressive, metastatic, non-squamous NSCLC despite ICI treatment in the second quarter of 2026.

o
We expect to announce updated data on OS including data on long-term survival and biomarker analysis from the phase 2a clinical trial in the first quarter of 2026.

▪
Pancreatic Cancer

o
We conducted a randomized controlled phase 2a clinical trial in the United States and Mexico evaluating the activity of aglatimagene in borderline resectable pancreatic ductal adenocarcinoma (PDAC). In December 2023, we announced that the FDA granted Fast Track Designation for aglatimagene plus valacyclovir for the treatment of patients with PDAC to improve overall survival. In April 2024, we announced updated positive overall survival data and supportive biomarker data and also announced that the FDA has granted Orphan Drug Designation for aglatimagene for the treatment of PDAC. In July 2025, we announced that the European Medicines Agency (EMA) has granted Orphan Designation for aglatimagene for the treatment of pancreatic cancer.

o
In February 2025, we announced the final analysis of this phase 2a clinical trial of aglatimagene in borderline resectable PDAC:

▪
Estimated median overall survival after enrollment was 31.4 months in the aglatimagene group versus 12.5 months in the control group.

▪
Importantly, 3 out of 7 patients who received aglatimagene were still alive at the time of data cut-off (February 20, 2025) with survival of 66.0, 63.6, and 35.8 months, respectively, after enrollment; survival from the time of diagnosis was 73.5, 68.8 and 41.3 months, respectively, for these patients. In contrast, only one out of 6 patients randomized to SoC chemotherapy arm remained alive at the data cutoff; histologic analysis at resection showed intraepithelial neoplasia associated with improved prognosis in this patient.

▪
Median post-progression survival was 21.2 months in the aglatimagene arm vs. 6.4 months in the control arm.

▪
In October 2025, we decided to pause on further clinical development of aglatimagene in PDAC, in the context of portfolio prioritization, unless externally funded through a grant or other non-dilutive external funding.

Our lead HSV-based product candidate, linoserpaturev (referred to previously as CAN-3110), is currently being evaluated in an ongoing investigator-sponsored phase 1b clinical trial in the initial target indication of recurrent high-grade glioma (HGG). Patients recruited in this study have previously failed SoC treatment and have a poor prognosis (expected overall survival 6-9 months).

In October 2023, we published an article in Nature that reported extended overall survival associated with immune activation in patients with recurrent HGG treated with linoserpaturev. Notably, data reported an increased survival in the 66% of patients with positivity for anti-HSV1 antibodies (mOS of 14.2 months). Immune status was positively associated with survival both in patients with pre-existing HSV1 antibodies (pre-treatment) and in 33% of patients who, while negative at baseline, developed anti-HSV1 antibodies after a single injection of linoserpaturev. Clinical responses were observed in both injected and uninjected lesions in patients with multifocal disease. Significant tumor responses were observed in both arm A and arm B of this study. Analysis of post-treatment samples demonstrated evidence of persistent HSV antigen expression and replication in both injected and uninjected tumor tissue associated with CD8+ T cell infiltration. The extent of immune activation, measured by gene profiling and quantification of immune cells in post-treatment specimens, was associated with the presence of anti-HSV1 antibodies and survival. Survival was also associated with the diversity of the T cell repertoire in circulating T cells, suggesting that patients who were able to mount a diverse immune response against the virus and tumor antigens released during the oncolytic process after linoserpaturev administration, had improved survival.

In February 2024, we announced that the FDA granted Fast Track Designation for linoserpaturev for the treatment of patients with recurrent HGG to improve overall survival. In May 2024, we also announced that the FDA granted Orphan Drug Designation for linoserpaturev for the treatment of recurrent HGG.

In November 2024, during the Society for Immunotherapy of Cancer (SITC) Annual Meeting, we presented data demonstrating the antitumor activity of linoserpaturev in preclinical models of melanoma, a tumor characterized by high

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Nestin expression, frequent loss-of-function in CDKN2A, and alterations in the Ras-Raf signaling pathway. This data supports the potential to expand the evaluation of linoserpaturev into tumors beyond recurrent HGG, creating a potential pipeline in a product.

We are conducting an extension of the clinical trial (arm C), in which patients with recurrent glioblastoma receive a repeat dosing regimen of linoserpaturev (up to six injections over four months). Clinical data from arm C will help evaluate whether multiple injections could further improve survival. This clinical trial extension is supported by the Break Through Cancer foundation. In October 2024, at the 16th Annual International Oncolytic Virotherapy Conference (IOVC), we presented initial clinical and biomarker data from Arm C of the linoserpaturev trial. The principal investigator reported improved survival compared to historical controls in patients who received multiple injections of linoserpaturev. Post-treatment longitudinal biopsies showed a near absence of tumor cells with dense lymphocyte infiltration, particularly in patients with post-treatment MRI enhancement, consistent with radiologic pseudo-progression. These findings were reported in a Science Translational Medicine manuscript published in October 2025, which followed two patients from Arm C through 97 serial tumor biopsies. Serial brain biopsy samples showed extensive immune-mediated remodeling of the tumor microenvironment after linoserpaturev administration, characterized by dense lymphocyte infiltration and extensive tumor necrosis (death). One patient achieved a complete pathological response, with clearance of tumor cells from post-treatment biopsies. In contrast, MRI scans for both patients showed apparent tumor enlargement (pseudo-progression), underscoring that conventional imaging criteria may underestimate linoserpaturev’s immunologic activity. These results illustrate the limitations of conventional imaging in evaluating the response to viral immunotherapy in glioblastoma and highlight the importance of overall survival data, supported by histology, in this indication.

In October 2025, we also announced updated OS data for Arm A and Arm B as of August 15, 2025. The updated mOS was 11.8 months for arm A (n=41) (CI: 8.3–14.9) and 12.0 months for arm B (n=9) (CI: 10.0–NA), respectively, after a single injection of linoserpaturev. One patient from arm A and one patient from arm B were still alive after prolonged follow-up (59.2 and 42.4 months, respectively, after linoserpaturev administration). At the time of data cutoff, 9 patients in arm C had received multiple administrations of linoserpaturev. At the 1×10⁸ plaque-forming unit (PFU) dose, 3 patients received 4 injections, 1 patient received 5 injections, and 2 patients received 6 injections. At the 1×10⁷ PFU dose, 1 patient received 4 injections, and 2 patients received 5 injections. Median follow-up was 8.9 months. Four out of 9 patients were alive at the time of data cutoff (range 3.1-28.2 months after initiation of linoserpaturev treatment). Five patients had died, of which 3 died more than one year after initiation of linoserpaturev treatment (range 5.5-21.8 months).

We have recently completed enrollment in arm C, and expect to present mature mOS data and an update on long-term survivors in the fourth quarter of 2026.

In January 2026, we received clearance for an IND that will support enabling work for a potential future randomized controlled phase 2 dose regimen finding study of linoserpaturev in recurrent glioblastoma.

We have also designed additional novel viral immunotherapy candidates using our proprietary enLIGHTEN™ Discovery Platform, a systematic, iterative HSV-based discovery platform leveraging human biology and advanced analytics to create new viral immunotherapy candidates for solid tumors.

In November 2023, during the SITC 2023 Annual Meeting, we presented two posters describing the key elements of the platform and the development of the first experimental agent from the enLIGHTEN Discovery Platform. The first agent based on enLIGHTEN™, Alpha-201 Macro1, is an investigational viral immunotherapy designed to interfere with the CD47/SIRPα pathway and activate innate immune surveillance. Results demonstrated monotherapy activity of this agent following local administration in a preclinical model of lung and breast cancer. Additional preclinical data presented at SITC confirmed the capability of the enLIGHTEN™ Advanced Analytics suite to predict optimal gene payload combinations to arm viral vectors, enabling the design of potential combination therapeutics to overcome tumor resistance especially in cancers resistant to immune checkpoint inhibitor treatment.

In April 2024, during the American Association for Cancer Research's 2024 Annual Meeting, we presented data on a second preclinical candidate from the enLIGHTEN™ Discovery Platform, a first-in-class multimodal immunotherapy for induction of tertiary lymphoid structures, being developed as a novel therapeutic strategy for solid tumors. Data presented included preclinical in vivo evidence of monotherapy activity of this preclinical candidate as well as activity when administered in combination with immune checkpoint inhibitors (improved survival as compared to PD-1 only treated mice).

In October 2024, during the 16th Annual IOVC, we presented data on a novel biological multimodal therapeutic from the enLIGHTENTM Discovery Platform, the third preclinical candidate, encoding IL-12 and IL-15. Data included the ability of this asset to induce expansion and activation of natural killer and CD8+ T cells, resulting in significant inhibition of tumor growth and tumor regression in two different tumor models.

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We currently own development and commercialization rights for all our programs in major markets, including the United States, Europe and Asia, allowing us to control development and seek approval in these areas as we prepare our commercialization efforts.

General Corporate

We were incorporated in Delaware in June 2003 as Advantagene, Inc. (Advantagene). In December 2019, Advantagene licensed substantially all the assets of Periphagen, a company focused on engineering HSV as a gene therapy vector, and in September 2020, licensed linoserpaturev from Mass General Brigham (MGB). In December 2020, we formally changed our name from Advantagene to Candel Therapeutics, Inc. We completed our initial public offering in July 2021.

On August 5, 2022, we filed a shelf registration statement on Form S-3 (as amended to date, the 2022 Shelf) with the U.S. Securities and Exchange Commission (SEC), which covered the offering, issuance and sale by us of up to an aggregate of $200.0 million of our common stock, preferred stock, debt securities, warrants and/or units of any combination thereof. We simultaneously entered into a sales agreement with Jefferies LLC, as sales agent, to provide for the issuance and sale by us of up to $75.0 million of our common stock from time to time in “at-the-market” offerings under the 2022 Shelf (the 2022 ATM Program). The 2022 Shelf was declared effective by the SEC on August 12, 2022 and expired on August 12, 2025. As of August 12, 2025 we had sold and issued 3,923,829 shares of common stock under the 2022 ATM Program, with total net proceeds of $20.9 million.

On December 16, 2024, we issued and sold 12,000,001 shares of common stock at a price to the public of $6.00 per share and pre-funded warrants to purchase up to an aggregate of 3,333,333 shares of common stock at a price to the public of $5.99 per pre-funded warrant to purchase one share of the common stock for aggregate gross proceeds of approximately $92.0 million (the 2024 Follow-On Offering). We received approximately $85.9 million in net proceeds from the 2024 Follow-On Offering after deducting underwriting discounts and commissions and offering expenses. During the twelve months ended December 31, 2025, 3,328,064 shares of common stock were issued upon the exercise of the pre-funded warrants. As of December 31, 2025, all pre-funded warrants were exercised.

On June 25, 2025, we issued and sold 3,221,395 shares of common stock at a price per share of $4.67 to purchasers including existing healthcare-focused institutional investors, executive officers, and directors of the Company in a registered direct offering for aggregate gross proceeds of approximately $15.0 million, before deducting offering expenses payable by us (the Registered Direct Offering). We received approximately $14.3 million in net proceeds from the Registered Direct Offering after deducting offering expenses.

On August 14, 2025, we filed a shelf registration statement on Form S-3 (the 2025 Shelf) with the SEC, which covers the offering, issuance, and sale by us of up to an aggregate of $300.0 million of our common stock, preferred stock, debt securities, warrants and/or units of any combination thereof. We simultaneously entered into a sales agreement with Jefferies LLC, as sales agent, to provide for the issuance and sale by us of up to $50.0 million of our common stock from time to time in “at-the-market” offerings under the 2025 Shelf (the 2025 ATM Program). The 2025 Shelf was declared effective by the SEC on August 22, 2025. As of December 31, 2025 and through March 5, 2026, we have not sold any shares of common stock under the 2025 ATM Program.

On February 23, 2026, we issued and sold 18,348,624 shares of common stock at a price to the public of $5.45 per share for aggregate gross proceeds of approximately $100 million (the 2026 Follow-On Offering). We received approximately $93.5 million in net proceeds from the 2026 Follow-On Offering after deducting underwriting discounts and commissions and offering expenses. We also granted the underwriters a 30-day option to purchase up to 2,752,293 additional shares of common stock at the public offering price, less the underwriting discount.

Our cash and cash equivalents were $119.7 million as of December 31, 2025. We believe our existing cash and cash equivalents, together with the net proceeds from the 2026 Follow-On Offering, will enable us to fund our operating expenses and capital expenditure requirements into the first quarter of 2028.

Collaborations

We are a party to a number of license, royalty and collaboration agreements under which we license patents, patent applications and other intellectual property to and from third parties.

RTW. On February 19, 2026, we entered into a purchase and sale agreement (the RTW Purchase Agreement) with funds managed by RTW Investments, LP (RTW). Under the terms of the RTW Purchase Agreement, RTW has agreed to pay us $100 million (the RTW Purchase Price) upon the marketing approval of aglatimagene for the treatment of intermediate-risk and high-risk localized prostate cancer by the FDA in exchange for a tiered royalty on future net sales of aglatimagene in the United States. RTW will be entitled to a 4.67% royalty on the portion of annual net sales in the United States that is less than or equal to $1 billion, and a 1.33% royalty on the portion of annual net sales in the United States, exceeding $1 billion. The 4.67% tier will increase to 6.67% if annual net sales do not achieve certain specified

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levels (the Ratchet), subject to a cure opportunity by us (provided that such Ratchet and cure opportunity may each subsequently occur more than once).

The royalty payments become payable following the first commercial sale of aglatimagene in the United States and end upon RTW’s receipt of $250 million in royalty payments (the RTW Royalty Cap). If we undergo a change of control with, or sell aglatimagene and all of the aglatimagene rights to, a third party, the RTW Purchase Agreement provides the Company and RTW with an option for us to pay certain specified amounts to terminate the RTW Purchase Agreement, depending upon the timing for such transaction, up to the RTW Royalty Cap (the Buy-Out Option). If either party exercises the Buy-Out Option, the RTW Purchase Agreement will automatically terminate upon payment of the specified amount.

The transaction is subject to certain closing conditions, including that FDA approval must occur by a specified date, conditions related to our indebtedness and other customary closing conditions. The RTW Purchase Agreement also contains customary representations, warranties and indemnities on the part of us and RTW and customary covenants on the part of us, including around our indebtedness as well as licensing and other activities related to aglatimagene and its rights.

Periphagen. On December 9, 2019, we entered into a series of agreements, including an exclusive license agreement, a novation agreement, an equipment purchase agreement and an intellectual property assignment agreement, collectively the Periphagen Agreements, with Periphagen, whereby we acquired certain assets and licensed certain rights (including specified patent rights and know-how, or the Licensed IP Rights) of Periphagen, primarily consisting of exclusive rights to their technology platform and a portfolio of preclinical, development stage virus vectors. The primary classes of assets are HSV-derived assets expressing neurotrophin-3 (or NT-3 Assets) and other HSV-derived assets (Gene Transfer Neuro-Assets). Under the license agreement, Periphagen granted us a worldwide exclusive license with the right to grant sublicenses through multiple tiers under the Licensed IP Rights to conduct research and to develop, make, have made, use, have used, offer for sale, have sold, export and import products incorporating the Licensed IP Rights in all fields of use except the treatment, diagnosis, and prevention of nononcologic skin diseases and conditions (including use as an aesthetic).

On June 7, 2023, we entered into an amendment to the exclusive license agreement. Under the amendment, our rights to the NT-3 Assets and Gene Transfer Neuro-Assets reverted to Periphagen, and we no longer have any obligations (including without limitation diligence obligations and payment obligations) with respect to the NT-3 Assets or Gene Transfer Neuro-Assets. With respect to the remaining Licensed IP Rights, we retained a worldwide exclusive license with the right to grant sublicenses through multiple tiers under the Licensed IP Rights to conduct research and to develop, make, have made, use, have used, offer for sale, have sold, export and import products incorporating the Licensed IP Rights in field of the treatment, diagnosis, and prevention of oncologic diseases and conditions.

Mass General Brigham (MGB). On January 20, 2018, we entered into an exclusive option agreement (the Option Agreement) with MGB. Pursuant to the Option Agreement, we obtained the exclusive right from MGB to negotiate a world-wide, royalty-bearing license to develop and commercialize products covered by certain MGB patents, including those patents covering linoserpaturev, in the field of gene therapy and oncolytic vector therapy for the treatment or prevention of cancerous tumors in humans or animals, as such field is further detailed in the Option Agreement (the Licensed Field). In consideration for MGB’s granting of the exclusive option, we paid MGB a non-refundable fee of $40,000.

Under the Option Agreement, we were required to use reasonable efforts to enter into a clinical trial agreement with MGB. We entered into such clinical trial agreement with MGB (MGB Clinical Trial Agreement) on June 19, 2018. Under the MGB Clinical Trial Agreement, we have committed to remitting financial support for the performance of a specified phase 1 clinical trial by MGB pursuant to a protocol summary contained in the Option Agreement.

On September 15, 2020, we exercised our option and entered into an exclusive patent license agreement with MGB (the MGB License Agreement). Under the MGB License Agreement, MGB granted to us (a) an exclusive, royalty-bearing license under certain of MGB’s patents to make, have made, use, have used, sell and have sold certain products covered by such licensed patents (Licensed Products) and otherwise practice processes covered by such licensed patents (Licensed Processes); and (b) a non-exclusive, royalty-bearing license under certain other of MGB’s patents to make, have made, use, have used, sell and have sold Licensed Products, but not to sell or have sold Licensed Processes. The foregoing rights are sublicensable, subject to sublicensing terms set forth in the MGB License Agreement. In connection with executing the MGB License Agreement, we paid a license issue fee and also agreed to reimburse MGB for all reasonable fees and expenses MGB had incurred and will incur for the preparation, filing, prosecution and maintenance of the licensed patent rights.

Ventagen. On March 1, 2014, we entered into an exclusive license agreement ( the Ventagen Agreement) with Ventagen, a related party. The Ventagen Agreement provides Ventagen an exclusive license, with rights to grant sublicense (subject to certain terms and conditions) under any worldwide patent rights and know-how owned or

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controlled by us during the term of the Ventagen Agreement which cover applicable technology utilizing the delivery method of the herpes derived TK protein to tumors or other tissues via a viral vector (as further specified therein), to research, use, have used, import, have imported, export, have exported, offer for sale, have sold, sell, distribute and market certain products for the prevention or treatment of cancer in humans and any use in animals (or the Field of Use), or the Licensed Products, for commercial sale and distribution within Mexico, Belize, Guatemala, Honduras, El Salvador, Costa Rica, Nicaragua, Panama, Colombia and Bolivia.

Components of Our Results of Operations

Revenue

To date, we have not generated any revenue from product sales and do not expect to generate any revenue from sales of products in the foreseeable future.

Operating Expenses

Our operating expenses since inception have consisted solely of research and development costs and general and administrative costs.

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for our product development activities for our two primary drug candidates, aglatimagene and linoserpaturev. We expense research and development costs as incurred. These include the following:

•
employee-related costs, including salaries, benefits and stock-based compensation expense, for personnel engaged in research, development and clinical management functions;

•
expenses incurred under agreements with third party clinical sites for the treatment and follow-up for patients enrolled in our clinical trials;

•
the cost of acquiring and manufacturing preclinical study materials, including manufacturing registration and validation batches;

•
payments made under third-party licensing agreements;

•
costs incurred to develop the manufacturing process and capabilities for future clinical trials and commercialization. Our clinical trial material for use in our existing clinical trials was manufactured in prior years;

•
costs related to compliance with quality and regulatory requirements;

•
costs of outside consultants, primarily related to regulatory; and

•
facility-related expenses, which include direct depreciation costs and expenses for rent and maintenance of facilities and insurance, and other operating costs if specifically identifiable to research and development activities.

We expect that our research and development expenses will continue to increase substantially for the foreseeable future and will comprise a larger percentage of our total expenses as we complete our clinical trials and commence additional clinical trials, continue to discover and develop additional product candidates and develop and scale our manufacturing capabilities. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to increased scale and duration of later stage clinical trials.

We cannot determine with certainty the duration and costs of future clinical trials of aglatimagene and linoserpaturev or any other product candidate we may develop or if, when, or to what extent we will generate revenue from the commercialization and sale of any product candidate for which we obtain marketing approval. At this time, we cannot accurately estimate or know the nature, timing and costs of the efforts that will be necessary to complete the clinical development of, or obtain regulatory approval for, any of our current or future product candidates. The duration, costs, and timing of clinical trials and development of aglatimagene and linoserpaturev and any other product candidate we may develop will depend on a variety of factors, including:

•
the scope, rate of progress, expense and results of clinical trials;

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•
our successful enrollment in and completion of clinical trials, including our ability to generate positive data from any such trials;

•
our ability to add and retain key research and development personnel;

•
the actual probability of success for our product candidates, including their safety and efficacy, early clinical data, competition, manufacturing capability, and commercial viability;

•
significant and changing government regulation and regulatory guidance;

•
the timing and receipt of any marketing approvals;

•
the progress of the development efforts of parties with whom we may enter into collaboration agreements, and the terms and timing of any additional collaboration agreements, license or other arrangement, including the timing of any payments thereunder;

•
our ability to enter into agreements with contract development and manufacturing organizations (CDMOs) for the development, clinical manufacture and commercial manufacture of our product candidates aglatimagene and linoserpaturev;

•
costs related to manufacturing of our product candidates or to account for any future changes in our manufacturing plans;

•
our ability to successfully commercialize our product candidates, if and when approved;

•
raising additional funds necessary to complete clinical development of our product candidates;

•
our ability to obtain and maintain third-party insurance coverage and adequate reimbursement for our product candidates, if and when approved;

•
the acceptance of our product candidates, if approved, by patients, the medical community and third-party payors;

•
effectively competing with other products if our product candidates are approved;

•
the impact of any business interruptions to our operations, including the timing and enrollment of patients in our planned clinical trials, or to those of our manufacturers, suppliers, or other vendors, resulting from any future public health crisis, ongoing geopolitical conflicts and related global economic sanctions, or tariffs or other trade restrictions;

•
our ability to maintain a continued acceptable safety profile for our therapies following approval;

•
our ability to obtain and maintain patents, trade secret and other intellectual property protection and regulatory exclusivity for our product candidates, both in the United States and internationally; and

•
the expense of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights.

A change in the outcome of any of these variables with respect to the development of a product candidate could significantly change the costs and timing associated with the development of that product candidate. We may never succeed in obtaining regulatory approval for any of our product candidates.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries and other related costs, including stock-based compensation, for personnel in our executive, finance, business development, and administrative functions. General and administrative expenses also include legal fees relating to intellectual property and corporate matters; professional fees for accounting, auditing, tax and consulting services; commercial readiness costs; insurance costs including directors and officers insurance; travel expenses; and facility-related expenses, which include direct depreciation costs and expenses for rent and maintenance of facilities, and other operating costs that are not specifically attributable to research and development activities.

We expect that our general and administrative expenses will increase in the future as we increase our personnel headcount to support our continued clinical development and manufacturing activities and to meet the requirements of a public company. We expect to incur increased expenses associated with being a public company, including costs of

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accounting, audit, legal, regulatory, and tax-related services associated with maintaining compliance with exchange listing and SEC requirements; director and officer insurance costs; and investor and public relations costs.

Grant Income

Grant income consists of amounts received under a grant from the Massachusetts Life Sciences Center.

Interest Income

Interest income primarily consists of amounts earned on investment of cash equivalents.

Interest Expense

Interest expense primarily consists of interest expense on our debt under our Loan and Security Agreement with Trinity and our Loan Agreement with SVB.

Change in Fair Value of Warrant Liabilities

In connection with the November 13, 2018 issuance of Series B preferred stock we issued warrants to the purchasers of the Series B preferred stock, to purchase up to 7,344,968 shares of our common stock with an exercise price of $6.81 per share. On October 14, 2025, the Company entered into an amendment (the Warrant Amendment) with holders, including affiliates of Paul Manning and Chris Martell, who are directors of the Company, of the Series B Warrants and the Conditional Series B Warrants. Pursuant to the Warrant Amendment, the holders agreed (i) to extend the expiration date of the Series B Warrants and the Conditional Series B Warrants from November 2025 to September 2027; (ii) to irrevocably release the Company and its directors, officers and affiliates (collectively, the Releasees) from any and all claims that the holders may have against the Releasees related to any alleged breach of or wrongful act under that certain Series B Preferred Stock Purchase Agreement dated November 13, 2018 by and between the Company and PBM ADV Holdings, LLC (the Purchase Agreement) and the issuance of shares of the Company’s Series B preferred stock or existing warrants under the Purchase Agreement; (iii) to not, during the six months following the Warrant Amendment, (x) transfer or dispose of any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock, or (y) enter into any swap or other arrangement that transfers to another any of the economic consequences of ownership of such securities, subject to certain exceptions set forth in the Warrant Amendment; and (iv) that, if requested by the underwriters in any equity financing transaction undertaken by the Company prior to September 30, 2027, to execute a standard lock-up agreement in connection with such equity financing. We also issued a warrant to the NC Incorporated Ohio Trust, an irrevocable trust funded by us, to purchase 162,740 shares of our common stock, $0.01 par value, at an exercise price of $1.46 per share, subject to adjustments as specified in the warrant agreement (the NC Ohio Warrants). Certain of those warrants are recorded as a liability on our balance sheet. The warrants recorded as a liability are remeasured to their fair value at each reporting date with changes in the fair value recognized as a component of other income (expense), net in the consolidated statements of operations. We will continue to recognize changes in the fair value of the warrants until they are exercised, expire or qualify for equity classification. The fair value of the warrants is determined based on significant inputs not observable in the market. The fair value of the warrants uses various valuation methods, including the Monte Carlo method, the option-pricing method, probability-weighted expected return and the hybrid method, all of which incorporate assumptions and estimates, to value the common stock warrants. The hybrid method is often used when a company is expecting a liquidity event in the near future and is a combination of the option-pricing and probability-weighted expected return methods. Estimates and assumptions impacting the fair value measurement include the fair value per share of the underlying shares of common stock, risk-free interest rate, expected dividend yield, and the remaining contractual term of the warrants.

In connection with the October 14, 2025 Trinity LSA we issued warrants to the Lenders to purchase up to 254,642 shares of our common stock, $0.01 pay value, at an exercise price of $5.89 per share. In connection with the drawdown of any Tranche under the Trinity LSA, the Company is required to issue to the Lenders warrants (the Lender Warrants) to purchase shares of the Company’s common stock, $0.01 par value per share. The exercise price for the Lender Warrants is equal to $5.89 per share. The number of shares of common stock for which each Lender Warrant is exercisable is equal to 3.0% of the applicable drawn down amount, divided by the exercise price. The Lender Warrants shall have a term of ten years from the date of issuance and shall permit cashless net exercise, all in accordance with their terms. Certain of those warrants are recorded as a liability on our balance sheet. The warrants recorded as a liability are remeasured to their fair value at each reporting date with changes in the fair value recognized as a component of other income (expense), net in the consolidated statements of operations. We will continue to recognize changes in the fair value of the warrants until they are exercised, expire or qualify for equity classification. The fair value of the warrants is determined based on significant inputs not observable in the market. The fair value of the warrants is determined using a hybrid Monte Carlo simulation and Black-Scholes methodology, which incorporates assumptions and estimates to value the common stock warrants. Key inputs, estimates, and assumptions impacting the fair value measurement include the Company stock price, risk-free interest rate, expected dividend yield, volatility, remaining

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contractual term of the warrants, timing of milestone achievements, and expected stock price increases and decreases in success and failure scenarios related to the milestones.

Income Taxes

Since our inception, we have generated cumulative federal and state net operating loss and research and development credit carryforwards for which we have not recorded any net tax benefit due to uncertainty around utilizing these tax attributes within their respective carryforward periods.

As of December 31, 2025, we had federal net operating loss carryforwards (NOLs) of approximately $141.1 million and state NOLs of approximately $131.2 million which may be available to offset future taxable income. Our federal NOLs include $8.8 million available to reduce future taxable income through 2037 and approximately $132.3 million of NOLs that do not expire and are available to reduce future taxable income indefinitely. The state NOLs are available to offset future taxable income through 2045. As of December 31, 2025, we also had federal and state research and development tax credit carryforwards of $5.7 million and $2.6 million, respectively, which are available to offset federal and state tax liabilities through 2045 and 2040, respectively.

Realization of future tax benefits is dependent on many factors, including our ability to generate taxable income within the NOL period. Our management has evaluated the positive and negative evidence bearing upon the realizability of our deferred tax assets, which are comprised principally of net operating loss carryforwards and certain tax credits.

Management has considered our history of cumulative net losses incurred since inception, as well as our lack of product revenue since inception, and has determined that it is more likely than not that we will not realize the benefits of its deferred tax assets. As a result, a full valuation allowance has been established at December 31, 2025.

NOL and tax credit carryforwards may become subject to an annual limitation in the event of certain cumulative changes in the ownership interest of significant stockholders over a three-year period in excess of 50%, as provided under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended (the Code), as well as under similar state provisions. These ownership changes may limit the amount of NOLs that can be utilized annually to offset future taxable income. In general, an ownership change, as defined under Section 382 of the Code (Section 382), results from transactions increasing the ownership of certain stockholders or public groups in the stock of a corporation by more than 50% over a three-year period. We have completed several financings and not yet determined if such a limitation would be placed against our NOL. We will make such a determination prior to the utilization of any NOL.

Results of Operations

The following table summarizes our results of operations for the years ended December 31, 2025 and 2024 (in thousands):

YEAR ENDED DECEMBER 31,

2025

2024

CHANGE

Operating expenses:

Research and development

$

30,496

$

19,314

$

11,182

General and administrative

17,770

14,057

3,713

Total operating expenses

48,266

33,371

14,895

Loss from operations

(48,266

)

(33,371

)

(14,895

)

Grant income

89

—

89

Interest income

3,915

1,086

2,829

Interest expense

(2,119

)

(2,090

)

(29

)

Change in fair value of warrant liabilities

8,199

(20,802

)

29,001

Net loss

$

(38,182

)

$

(55,177

)

$

16,995

Comparison of the Years Ended December 31, 2025 and 2024

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Research and Development Expenses

The following table summarizes our research and development expenses for the years ended December 31, 2025 and 2024 (in thousands):

YEAR ENDED DECEMBER 31,

INCREASE

2025

2024

(DECREASE)

Clinical development

$

14,738

$

5,196

$

9,542

Employee-related

12,308

11,669

639

Depreciation, impairment, and loss on sale and disposals of fixed assets

1,230

1,020

210

Occupancy

649

546

103

Pre-clinical research

634

384

250

Recruiting

247

0

247

Other

690

499

191

$

30,496

$

19,314

$

11,182

Research and development expenses increased $11.2 million from $19.3 million for the year ended December 31, 2024 to $30.5 million for the year ended December 31, 2025. The increase was primarily attributable to a $9.5 million increase in clinical development costs driven by increased manufacturing, clinical trial and regulatory costs for aglatimagene programs and a $0.6 million increase in employee-related expenses.

General and Administrative Expenses

The following table summarizes our general and administrative expenses for the years ended December 31, 2025 and 2024 (in thousands):

YEAR ENDED DECEMBER 31,

INCREASE

2025

2024

(DECREASE)

Employee-related

$

7,624

$

6,831

$

793

Professional and consulting fees

5,609

5,263

346

Commercial readiness

2,689

—

2,689

Insurance

988

1,188

(200

)

Occupancy

194

192

2

Information technology costs

138

125

13

Recruiting

20

—

20

Other

508

458

50

$

17,770

$

14,057

$

3,713

General and administrative expenses increased $3.7 million from $14.1 million for the year ended December 31, 2024 to $17.8 million for the year ended December 31, 2025. The increase was primarily attributable to a $2.7 million increase in commercial readiness costs, a $0.8 million increase in employee-related expenses, and a $0.3 million increase in professional and consulting fees.

Grant Income

There was $88,800 of grant income for the year ended December 31, 2025, compared to zero for the year ended December 31, 2024. Grant income for the year ended December 31, 2025 relates to the recognition of income from a grant from the Massachusetts Life Sciences Center.

Interest Income

Interest income was $3.9 million for the year ended December 31, 2025, compared to $1.1 million for the year ended December 31, 2024, and primarily represents earnings on our cash equivalents. The increase in interest income is the result of interest being generated on a higher cash equivalents balance for the year ended December 31, 2025 compared to the year ended December 31, 2024.

Interest Expense

Interest expense was $2.1 million for each of the years ended December 31, 2025 and 2024, and represents interest expense on our outstanding debt obligations.

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Change in Fair Value of Warrant Liabilities

The change in fair value of our warrant liabilities was a decrease in the fair value of $8.2 million for the year ended December 31, 2025, compared to an increase in the fair value of $20.8 million for the year ended December 31, 2024. The change in the fair value of the warrant liabilities is primarily related to the existing Series B Warrant liability and is primarily driven by lower volatility and changes in the underlying value of our stock price, partially offset by term to maturity.

Liquidity and Capital Resources

Since our inception, we have not generated any revenue from product sales and have incurred significant operating losses. We expect to continue to incur significant expenses and operating losses for the foreseeable future as we advance the clinical development of our product candidates. We expect that our research and development and general and administrative costs will continue to increase significantly, including in connection with conducting clinical trials for our product candidates, developing our manufacturing capabilities which may include the cost of establishing a relationship with contract manufacturers to support commercial launch of our product candidate aglatimagene and costs associated with equipping our laboratory and manufacturing facility to support clinical trials and commercialization and providing general and administrative support for our operations, including the cost associated with operating as a public company. As a result, we will need additional capital to fund our operations, which we may obtain from additional equity or debt financings, collaborations, licensing arrangements or other sources. As of December 31, 2025, we had cash and cash equivalents of $119.7 million. Based on current plans and assumptions, we expect that our existing cash and cash equivalents, together with the net proceeds from the 2026 Follow-On Offering, will be sufficient to fund our current operating plan into the first quarter of 2028. We will require additional capital to commercialize aglatimagene in early localized prostate cancer, to advance the phase 3 trial for aglatimagene in NSCLC, and to advance the development of linoserpaturev beyond the current trials.

We do not currently have any approved products and have never generated any revenue from product sales. We have financed our operations primarily through proceeds from government grants and proceeds from the sale of convertible notes, common stock, and our convertible preferred stock. As of December 31, 2025, we have raised approximately $291.9 million of gross proceeds from such transactions, including $15.9 million of government grants, $66.1 million from the sale of convertible preferred stock, $207.6 million from the sale of our common stock and accompanying pre-funded warrants, and $2.3 million from stock option exercises. Our cash and cash equivalents totaled $119.7 million as of December 31, 2025. We had $47.1 million of debt as of December 31, 2025.

On February 24, 2022, we entered into a Loan Agreement with SVB pursuant to which SVB agreed to provide term loans to us in an aggregate principal amount of $20.0 million. We borrowed $20.0 million upon entering into the SVB Loan Agreement. The term loan was secured by substantially all of our properties, rights and assets, except for our intellectual property, which is subject to a negative pledge under the SVB Loan Agreement.

The term loan bore interest at a floating rate per annum equal to the greater of (A) 5.75% and (B) the prime rate (as published in the money rates section of The Wall Street Journal) plus 2.50%. We were required to make monthly interest payments, and commencing on February 1, 2024, 24 consecutive installments of principal plus monthly payments of accrued interest. The term loan had a maturity date of January 1, 2026. Upon repayment in full of the term loans, we were required to pay a final payment fee equal to 4.50% of the original principal amount of any funded term loan being repaid. The SVB Loan Agreement permitted voluntary prepayment of all, but not less than all, of the SVB term loans, subject to a prepayment premium of 1% to 3% based upon the timing of the prepayment. We used a portion of the proceeds from the First Tranche of the Trinity LSA (defined below) to repay the SVB Loan Agreement in full on October 14, 2025.

On August 5, 2022, we filed the 2022 Shelf with the SEC, which covered the offering, issuance and sale by us of up to an aggregate of $200.0 million of our common stock, preferred stock, debt securities, warrants and/or units of any combination thereof. We simultaneously entered into a sales agreement with Jefferies LLC, as sales agent, to provide for the issuance and sale by us of up to $75.0 million of our common stock from time to time in “at-the-market” offerings under the 2022 Shelf. The 2022 Shelf was declared effective by the SEC on August 12, 2022 and expired on August 12, 2025. As of August 12, 2025, we had sold and issued 3,923,829 shares of common stock under the 2022 ATM Program, with total net proceeds of $20.9 million.

In connection with the 2024 Follow-On Offering, we issued and sold 12,000,001 shares of common stock at a price to the public of $6.00 per share and pre-funded warrants to purchase up to an aggregate of 3,333,333 shares of common stock at a price to the public of $5.99 per pre-funded warrant to purchase one share of the common stock for aggregate gross proceeds of approximately $92.0 million. We received approximately $85.9 million in net proceeds from the 2024 Follow-On Offering after deducting underwriting discounts and commissions and offering expenses. During the twelve months ended December 31, 2025, 3,328,064 shares of common stock were issued upon exercise of the pre-funded warrants. As of December 31, 2025, all pre-funded warrants were exercised.

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In connection with the Registered Direct Offering, we issued and sold 3,221,395 shares of common stock at a price per share of $4.67 to the purchasers for aggregate gross proceeds of approximately $15.0 million, before deducting offering expenses payable by us. We received approximately $14.3 million in net proceeds from the Registered Direct Offering after deducting offering expenses.

On August 14, 2025, we filed the 2025 Shelf with the SEC, which covers the offering, issuance, and sale by us of up to an aggregate of $300.0 million of our common stock, preferred stock, debt securities, warrants and/or units of any combination thereof. We simultaneously entered into a sales agreement with Jefferies LLC, as sales agent, to provide for the issuance and sale by us of up to $50.0 million of our common stock from time to time in “at-the-market” offerings under the 2025 Shelf. The 2025 Shelf was declared effective by the SEC on August 22, 2025. As of December 31, 2025 and through March 5, 2026, we have not sold any shares of common stock under the 2025 ATM Program.

On October 14, 2025, we entered into a Loan and Security Agreement, as amended by that certain First Amendment to Loan and Security Agreement dated as of March 10, 2026 (the Trinity LSA), with the lenders party thereto (the Lenders) and Trinity Capital Inc., as administrative agent and collateral agent (the Agent).

Under the Trinity LSA, the Lenders agreed to extend debt capital to us, at our request, in the form of a term loan, in tranches totaling an aggregate principal amount of up to $130.0 million as follows: (a) at closing, the aggregate principal amount of $50.0 million (the First Tranche), (b) until May 30, 2027, subject to the achievement of certain regulatory, clinical and operational milestones by March 31, 2027, the aggregate principal amount of $20.0 million (the Second Tranche), (c) following funding of the Second Tranche, until February 29, 2028, subject to the achievement of certain regulatory and operational milestones by December 31, 2027, the aggregate principal amount of $30.0 million (the Third Tranche), and (d) following funding of the Third Tranche, in Lenders’ sole discretion, the aggregate principal amount of $30.0 million (the Fourth Tranche and collectively with the First Tranche, the Second Tranche and the Third Tranche, the Tranches). The obligations of the Lenders to extend such debt capital are subject to certain conditions precedent described in the Trinity LSA. We are required to pay a commitment fee of 1.0% of the amount drawn, plus related documentation and funding fees, in connection with each drawdown. On October 14, 2025 (the Closing Date), we drew down the First Tranche. Our obligations under the facility are secured by a first priority security interest in substantially all of our assets.

All Tranches will mature on October 1, 2030 (the Maturity Date), unless earlier accelerated under the terms of the Trinity LSA. At maturity, we are required to repay the then-outstanding principal amount, together with any accrued and unpaid interest thereon. In addition, at maturity or early termination of the Trinity LSA, we are required to pay the Lenders an additional 4.25% of the amounts drawn down by us under the Trinity LSA.

Interest accrues on the Tranches that we have drawn down at a floating rate per annum, calculated based on a 360-day year, equal to the greater of (a) the sum of (i) The Wall Street Journal Prime Rate and (ii) 3.0%, and (b) 9.75%. For the first 36 months after the Closing Date, we are required to make monthly payments of interest only in arrears. Upon the achievement of a certain commercial milestone by June 30, 2028, the Interest Only Period will be extended by twelve months. In the event of such extension of the Interest Only Period, the duration of the Amortization Period will decrease by the same amount. In any event, the total term of all Tranches shall not exceed 60 months.

We may voluntarily prepay the outstanding loan balance at any time, in whole or in part, subject to the payment of prepayment premiums and payment of the Exit Fee on the principal amount then prepaid. If prepayment occurs on or before the first anniversary of the Closing Date, the premium shall equal 3.0% of the principal being repaid. Thereafter, if prepayment occurs on or before the second anniversary of the Closing Date, the premium shall equal 2.0% of the principal being repaid. Thereafter, if prepayment occurs on or before the Maturity Date, the premium shall equal 1.0% of the principal being repaid.

The Trinity LSA contains customary affirmative and negative covenants, including with respect to notice obligations, limitations on new indebtedness, liens, investments and transactions with our affiliates, restrictions on the payment of dividends, maintenance of collateral and accounts and maintenance of insurance. The Trinity LSA also contains financial covenants requiring, if our market capitalization is less than $550 million, we maintain minimum cash and cash equivalents pledged to secure the obligations under the Trinity LSA, less certain accounts payable, of at least (i) beginning from July 1, 2026 through the date, that we have raised at least $93.5 million in unrestricted net cash proceeds from one or more bona fide equity financings and/or upfront proceeds from business development after the Closing Date, 67.5% of all of the aggregate principal amount of outstanding obligations under the Trinity LSA, and (ii) beginning from the earlier of (x) October 1, 2027 and (ii) the date upon which we receive written notice of certain regulatory outcomes, through the date that the we obtain certain regulatory approvals, 75% of the aggregate outstanding principal amount of the obligations under the Trinity LSA.

In connection with the drawdown of any Tranche, we are required to issue to the Lenders warrants (the Lender Warrants) to purchase shares of our common stock, $0.01 par value per share. The exercise price for the Lender Warrants shall be equal to $5.89 per share. The number of shares of common stock for which each Lender Warrant is exercisable is equal to 3.0% of the applicable drawn down amount, divided by the exercise price. The Lender Warrants

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shall have a term of ten years from the date of issuance and shall permit cashless net exercise, all in accordance with their terms. In connection with the drawdown of the First Tranche, we issued a Lender Warrant to purchase up to 254,642 shares of Common Stock.

As of December 31, 2025, we had an accumulated deficit of $230.4 million and have not generated any product sales. We do not know when, or if, we will generate revenue from product sales. We will not generate significant revenue from product sales unless and until we obtain regulatory approval and commercialize one of our current or future product candidates. Our primary uses of capital are, and we expect will continue to be, compensation and related expenses, third-party clinical and contract manufacturing costs, legal and other regulatory expenses, and general overhead costs. We expect that we will continue to generate losses for the foreseeable future, and we expect the losses to increase as we continue the development of, and seek regulatory approvals for, our product candidates, and begin to commercialize any approved products. We are subject to risks in the development of our products, and we may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. We will require substantial additional financing to fund our operations and to continue to execute our strategy, and we will pursue a range of options to secure additional capital.

In connection with the 2026 Follow-On Offering, we issued and sold 18,348,624 shares of common stock at a price to the public of $5.45 per share for aggregate gross proceeds of approximately $100 million (the 2026 Follow-On Offering). We received approximately $93.5 million in net proceeds from the 2026 Follow-On Offering after deducting underwriting discounts and commissions and offering expenses. We also granted the underwriters a 30-day option to purchase up to 2,752,293 additional shares of common stock at the public offering price, less the underwriting discount.

If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may be required to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or to grant licenses on terms that may not be favorable to us. If we are unable to raise capital when needed or on acceptable terms, it would have a negative impact on our financial condition and we could be forced to delay, reduce or eliminate our research, clinical trials, product development or future commercialization efforts.

Cash Flows

The following table summarizes our sources and uses of cash for the periods presented (in thousands):

YEARS ENDED DECEMBER 31,

2025

2024

Net cash used in operating activities

$

(38,311

)

$

(27,023

)

Net cash used in investing activities

(560

)

(16

)

Net cash provided by financing activities

56,098

94,280

Net increase in cash, cash equivalents and restricted cash

$

17,227

$

67,241

Cash Flows for the Years Ended December 31, 2025 and 2024

Operating Activities

Net cash used in operating activities for the year ended December 31, 2025 was $38.3 million, primarily consisting of a net loss of $38.2 million. We had non-cash charges of $2.3 million primarily related to the $8.2 million change in the fair value of our warrant liabilities, partially offset by non-cash stock-based compensation. Net cash used in operating activities was also impacted by $2.2 million in changes in operating assets and liabilities, primarily driven by an increase of $2.3 million in accrued expenses and an increase of $0.8 million in accounts payable. These changes were primarily offset by an increase of $0.5 million in prepaid expenses and other current assets and a decrease of $0.5 million in lease-related liabilities.

Net cash used in operating activities for the year ended December 31, 2024 was $27.0 million, primarily consisting of a net loss of $55.2 million as we incurred expenses associated with our clinical programs and incurred costs associated with operating as a public company. We had non-cash charges of $27.8 million primarily related to the $20.8 million change in the fair value of our warrant liability and non-cash stock-based compensation. Net cash used in operating activities was also impacted by $0.3 million in changes in operating assets and liabilities, primarily driven by an increase of $0.8 million in accrued expenses and a decrease of $0.2 million in prepaid expenses and other current assets. These changes were partially offset by a decrease of $0.5 million in lease-related liabilities and a decrease of $0.2 million in accounts payable.

Investing Activities

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Net cash used in investing activities for the year ended December 31, 2025 was $560,000 and consisted of the purchase of fixed assets.

Net cash used in investing activities for the year ended December 31, 2024 was $16,000 and consisted of the purchase of fixed assets.

Financing Activities

Net cash provided by financing activities for the year ended December 31, 2025 was $56.1 million and consisted of $47.9 million of net proceeds from the Trinity term loan, $14.3 million of net proceeds from the issuance of common stock in the Registered Direct Offering, $5.0 million of net proceeds from the issuance of common stock under our 2022 ATM Program, and $0.5 million of proceeds from option exercises, partially offset by $11.7 million of principal payments on our term loan with SVB.

Net cash provided by financing activities for the year ended December 31, 2024 was $94.3 million and consisted of $85.9 million of net proceeds from the issuance of common stock and accompanying pre-funded warrants in the 2024 Follow-On Offering, $15.8 million of net proceeds from the issuance of common stock under the ATM Program and $1.7 million of proceeds from option exercises, partially offset by $9.2 million of principal payments on our term loan with SVB.

Funding Requirements

We expect our operating expenses to increase substantially in the future in connection with our ongoing activities, particularly as we advance aglatimagene and linoserpaturev through research and development, clinical trials, and develop our manufacturing capabilities, as we research and as we prepare for potential marketing approval and potential commercialization. We also expect to incur additional costs associated with operating as a public company.

Specifically, our costs and expenses will increase as we:

•
advance the clinical development of aglatimagene and linoserpaturev;

•
develop our manufacturing capabilities, including through relationships with contract manufacturers for potential commercial manufacturing of our product candidate aglatimagene and the development, construction and qualification of our clinical manufacturing capabilities, internally or through CDMOs for our product candidate linoserpaturev;

•
pursue preparatory activities for potential launch and commercialization for aglatimagene in localized prostate cancer;

•
pursue the preclinical and clinical development of other product candidates using our enLIGHTEN™ Discovery Platform, an HSV-based platform; and

•
expand our operational, financial, and management systems and increase personnel, including personnel to support our operations as a public company.

We believe that our existing cash and cash equivalents as of December 31, 2025, together with the net proceeds from the 2026 Follow-On Offering, will enable us to fund our operating expenses and capital expense requirements into the first quarter of 2028. We have based this estimate on assumptions that may prove to be incorrect, and we could utilize our available capital resources sooner than we currently expect.

Because of the numerous risks and uncertainties associated with the research, development, and commercialization of therapeutics, it is difficult to estimate with certainty the amount of our working capital requirements. Our future funding requirements will depend on many factors, including:

•
the progress, costs, and results of our clinical development and clinical trials for aglatimagene and linoserpaturev;

•
the progress, costs, and results of our additional research and preclinical development programs;

•
the costs, timing and outcome of regulatory review of our product candidates;

•
our ability to establish and maintain collaborations on favorable terms, if at all;

•
the outcome, timing and cost of meeting regulatory requirements established by the FDA and comparable foreign regulatory authorities, if applicable, for our product candidates;

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•
the costs and timing of internal and external process development for our manufacturing capabilities;

•
the scope, progress, results, and costs of any product candidates that we may derive from our HSV-based platform or with collaborators;

•
the costs of preparing, filing and prosecuting patent applications, obtaining, maintaining and enforcing our intellectual property rights and defending intellectual property-related claims; hire additional personnel in research, manufacturing, and regulatory and clinical development, as well as management personnel;

•
the extent to which we in-license or acquire rights to other products, product candidates, or technologies;

•
additions or departures of key scientific or management personnel;

•
the costs and timing of future commercialization activities, including product manufacturing, marketing, sales, and distribution for any of our product candidates for which we obtain marketing approval;

•
the amount of revenue, if any, received from commercial sales of our product candidates, should any of our product candidates receive marketing approval; and

•
the costs of operating as a public company.

Until such time as we can generate significant revenue from product sales, if ever, we expect to finance our cash needs through a combination of public or private equity or debt financings and other sources, which may include collaborations strategic alliances and licensing arrangements with third parties. We do not have any committed external source of funds. To the extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest may be diluted, and the terms of these securities may include liquidation or other preferences that could adversely affect your rights as a common stockholder. Debt financing and equity financing, if available, may involve agreements that include restrictive covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends, that could adversely impact our ability to conduct our business, in addition to those restrictive covenants contained in the Trinity LSA. If we raise additional funds through other sources, such as collaboration agreements, strategic alliances, licensing arrangements or marketing and distribution arrangements, we may have to relinquish valuable rights to our technologies, future revenue streams, product development, and research programs or product candidates, or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds when needed, we may be required to delay, limit, reduce, or terminate our product development or future commercialization efforts or grant rights to develop and market products or product candidates that we would otherwise prefer to develop and market ourselves.

Contractual Obligations and Commitments

Our primary contractual obligations are our facility lease, the Loan Agreement with SVB, and the Periphagen Note. The table below summarizes the contractual obligations that will become due as of December 31, 2025 (in thousands):

PAYMENTS DUE BY PERIOD

(in thousands)

TOTAL

LESS THAN

1 YEAR

1 TO 3

YEARS

3 TO 5

YEARS

Operating lease obligation (1)

$

2,285

$

618

$

1,241

$

426

Loan Agreement with Trinity (2)

71,177

4,879

13,540

52,758

Periphagen Note (3)

1,352

—

1,352

—

Total

$

74,814

$

5,497

$

16,133

$

53,184

(1)
Represents future minimum lease payments under our operating lease for office and laboratory space at our Needham, Massachusetts facility. Our facility lease, as amended, extends to August of 2029.

(2)
Represents future principal, interest payments, and the final payment fee on our Loan Agreement with Trinity, which matures on October 1, 2030.

(3)
Represents a $1.0 million promissory note plus interest under the terms of our asset purchase agreements with Periphagen, Inc. The promissory note is due upon maturity in November 2027.

See our consolidated financial statements and related footnotes elsewhere in this Annual Report on Form 10-K for additional information on these agreements.

We also enter into contracts in the normal course of business with hospitals, clinics, universities, and other third parties for clinical trials and testing and with construction contractors and process developers for the construction of our manufacturing facility. These contracts do not contain minimum purchase commitments and are cancelable by us upon prior written notice. Payments due upon cancelation consist only of payments for services provided or expenses

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incurred, including noncancelable obligations of our service providers, up to the date of cancelation. These payments are not included in the table above as the amount and timing of such payments are not known.

Critical Accounting Estimates

Our management’s discussion and analysis of financial condition and results of operations is based on our financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). The preparation of our consolidated financial statements and related disclosures requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, costs and expenses, and the disclosure of contingent assets and liabilities in our financial statements. These items are monitored and analyzed by us for changes in facts and circumstances, and material changes in these estimates could occur in the future. We base our estimates on historical experience, known trends and events, and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an ongoing basis. Our actual results may materially differ from these estimates under different assumptions or conditions.

While our significant accounting policies are described in more detail in the notes to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K, we believe that the following accounting policies are those most significant to the judgments and estimates used in the preparation of our consolidated financial statements.

Accrued Research and Development Expenses

As part of the process of preparing our financial statements, we are required to estimate our accrued research and development expenses. This process involves reviewing open contracts and purchase orders, communicating with our personnel to identify services that have been performed on our behalf, and estimating the level of service performed and the associated costs incurred for the services when we have not yet been invoiced or otherwise notified of the actual costs. Most of our service providers invoice us in arrears for services performed, on a pre-determined schedule or when contractual milestones are met; however, some require advance payments. We make estimates of our accrued expenses as of each balance sheet date in our financial statements based on facts and circumstances known to us at that time. We periodically confirm the accuracy of these estimates with the service providers and make adjustments, if necessary. Examples of estimated accrued research and development expenses include fees paid to the following:

•
clinical trial sites where patients are being treated with our product candidates;

•
consultants providing services related to process development, regulatory and other services; and

•
CDMOs who are manufacturing commercial-scale quantities of our product candidates.

Actual services performed may vary from our estimates, resulting in adjustments to research and development costs or inventories in future periods. Changes in these estimates that result in material changes to our accruals could materially affect our results of operations.

Determination of Fair Value of Warrants

In connection with the Series B convertible preferred stock issuance in November 2018, we issued warrants to purchase shares of common stock of which certain warrants are shown as a liability on the balance sheet. The fair value of the warrants was determined based on significant inputs not observable in the market. The fair value of the warrants uses various valuation methods, including the Monte Carlo method, the option-pricing method, probability-weighted expected return and the hybrid method, all of which incorporate assumptions and estimates, to value the common stock warrants. The hybrid method is often used when a company is expecting a liquidity event in the near future and is a combination of the option-pricing and probability-weighted expected return methods. Estimates and assumptions impacting the fair value measurement include the fair value per share of the underlying shares of common stock prior to the IPO, risk-free interest rate, expected dividend yield, expected volatility of the price of the underlying preferred stock, and the remaining contractual term of the warrants. The most significant assumption in the model impacting the fair value of the common stock warrants is the fair value of our common stock as of each remeasurement date. Prior to the IPO, we determined the fair value per share of the underlying common stock by taking into consideration the most recent sales of preferred stock, results obtained from third-party valuations and additional factors that were deemed relevant.

In connection with the drawdown of any Tranche under the Trinity LSA entered into in October 2025, we are required to issue to the Lenders warrants to purchase shares of common stock of which certain warrants are shown as a liability on the balance sheet. The fair value of the warrants was determined based on significant inputs not observable in the market. The fair value of the warrants is determined based on significant inputs not observable in the market. The fair value of the warrants is determined using a hybrid Monte Carlo simulation and Black-Scholes methodology, which

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incorporates assumptions and estimates to value the common stock warrants. Key inputs, estimates, and assumptions impacting the fair value measurement include the Company stock price, risk-free interest rate, expected dividend yield, volatility, remaining contractual term of the warrants, timing of milestone achievements, and expected stock price increases and decreases in success and failure scenarios related to the milestones. The most significant assumptions in the model impacting the fair value of the common stock warrants is the volatility of the Company’s common stock, and expected stock price increases or decreases on the respective milestone dates.

Stock-Based Compensation

We measure stock options and other stock-based awards granted to our employees, directors, consultants, advisors based on the fair value on the date of the grant. We recognize compensation expense over the requisite service period, which is generally the vesting period of the respective award. We recognize forfeitures as they occur. For stock-based awards granted to non-employees, compensation expense is recognized over the vesting period which approximates the period over which services are rendered by such non-employees.

We estimate the fair value of each stock option grant on the date of grant using the Black-Scholes option-pricing model, which uses as inputs the fair value of our common stock and assumptions we make for the expected volatility of our common stock, the expected term of our stock options, the risk-free interest rate for a period that approximates the expected term of our stock options, and our expected dividend yield.

Recent Accounting Pronouncements

A description of recent accounting pronouncements that may potentially impact our financial position, results of operations, or cash flows is disclosed in Note 2 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.

Emerging Growth Company Status

In April 2012, the Jumpstart Our Business Startups Act of 2012 (the JOBS Act) was enacted. Section 107 of the JOBS Act provides that an “emerging growth company,” or an EGC, can take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act of 1933, as amended (the Securities Act) for complying with new or revised accounting standards. Thus, an EGC can delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. We have elected to use the extended transition period for new or revised accounting standards during the period in which we remain an emerging growth company; however, we may adopt certain new or revised accounting standards early.

We will remain an emerging growth company until the earliest to occur of: (1) the last day of the fiscal year in which we have more than $1.235 billion in annual revenue; (2) the date we qualify as a “large accelerated filer,” with at least $700.0 million of equity securities held by non-affiliates; (3) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the prior three-year period; and (4) the last day of the fiscal year ending after the fifth anniversary of our initial public offering.

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