POWER SOLUTIONS INTERNATIONAL, INC. (PSIX) Business

Item 1.    Business.

General Business Overview

Power Solutions International, Inc., incorporated under the laws of the state of Delaware in 2011, designs, engineers, manufactures, markets and sells a broad range of advanced, emission-certified engines and power systems that are powered by a wide variety of clean, alternative fuels, including natural gas, propane, and biofuels, as well as gasoline and diesel options, within the power systems, industrial and transportation end markets. The Company manages the business as a single reportable segment.

The Company’s products are primarily used by global original equipment manufacturers (“OEMs”) and end-user customers across a wide range of applications and equipment that includes standby and prime power generation, demand response, microgrid, combined heat and power, arbor equipment, material handling (including forklifts), agricultural and turf, construction, pumps and irrigation, compressors and utility vehicles.

The Company provides highly engineered, comprehensive solutions designed to meet specific customer application requirements and technical specifications, including those imposed by environmental regulatory bodies, including the U.S. Environmental Protection Agency (“EPA”), the California Air Resources Board (“CARB”), the People’s Republic of China’s Ministry of Ecology and Environment (“MEE”) and regulatory bodies within the European Union (“EU”).

The Company’s products include both sourced and internally designed and manufactured engines that are engineered and integrated with associated components. These comprehensive power systems are tested and validated to meet quality, safety, durability and environmental standards and regulations.

Through advanced research and development (“R&D”) and engineering capabilities, the Company is able to provide its customers with highly optimized, efficient, durable and emissions-compliant products that enhance their competitive position.

The Company’s business is diversified across end markets and applications and also includes extensive aftermarket and service parts programs. These programs consist of (i) internal aftermarket service parts programs with worldwide sales and distribution capabilities and (ii) internal OEM-developed service parts programs for components and products supplied by the Company.

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The Company’s end markets, product categories and equipment are as highlighted in the following table:

Products

The Company’s sourced and internally designed and manufactured engine blocks are engineered and integrated with associated components in a range of configurations that includes basic engine blocks integrated with appropriate fuel system parts as well as completely packaged power systems that include combinations of front accessory drives, cooling systems, electronic systems, air intake systems, fuel systems, housings, power takeoff systems, exhaust systems, hydraulic systems, enclosures, brackets, hoses, tubes, packaging, telematics and other assembled componentry. The Company also designs and manufactures large, custom-engineered integrated electrical power generation systems for both standby and prime power applications. The Company’s comprehensive power systems are tested and validated to meet quality, safety, durability and environmental standards and regulations.

The Company sells engines and power systems, including both emission-certified compression ignition and spark-ignition internal combustion engines which are enabled by advanced controls to run on a wide variety of clean, alternative fuels, including natural gas, propane, and biofuels, as well as gasoline and diesel options, within the power systems, industrial and transportation end markets. Natural gas, gasoline, propane, and biofuel engines range from 0.99 liters (“L”) to 53L, while Diesel options range from 20L to 88L. The Company also designs and fabricates power system enclosures and sources electrification components that are engineered and integrated into desired configurations deemed “New Energy” within the industrial end market.

Strategic Initiatives/Growth Strategies

The Company continues to execute a comprehensive set of business objectives aimed at improving profitability, streamlining processes, strengthening the business and focusing on achieving growth in higher-return product lines. Key elements of these objectives and other initiatives are highlighted below.

Sustained profitability

The Company continues to improve profitability through the review of its customer and product portfolio. To date, this has resulted in strategic price increases in certain areas of the business, along with product redesign and the re-sourcing of certain components, to support improved margins. This program is a multi-year effort and will entail a strategic assessment of certain

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areas in which profitability does not meet established thresholds. The Company also continues to transform its manufacturing operations through the ongoing adoption of lean, agile and flexible lines, which provides opportunities for improved efficiency, margins and profitability, particularly as volume and sales increase. The Company has also been investing heavily in the expansion of its heavy-duty engine product line, which has historically provided better margins, particularly through its collaboration with Weichai America Corp., a wholly-owned subsidiary of Weichai Power Co., Ltd. (HK2338, 000338.SZ) (herein collectively referred to as “Weichai”). Weichai is the beneficial owner of 46.0% of the outstanding Common Stock.

Warranty expense mitigation efforts

The Company continues to limit its warranty expense through various mitigation efforts. As part of this, the Company is developing reimbursement and commercial remedies from key suppliers for components supplied by third parties, where applicable, at the same time ensuring any contractual obligations with customers include more favorable warranty terms for the Company wherever possible. Also, the Company continues to evaluate and improve its engineering validation and reliability programs for products and applications as well as make investments in technology to further enhance its tools and processes.

Streamlining of business processes and footprint rationalization

The Company has an ongoing program to review and identify cost reduction opportunities throughout the organization while simultaneously planning for strategic growth. As part of this program, the Company has adopted tighter controls over spending and centralized certain business processes.

Strengthen the business through the optimization of business systems and technology

The Company is working to strengthen its business through the optimization of its business systems and technology to support the strengthening of internal controls, improve processes, drive greater operational efficiencies and provide better and timelier decision making across the organization. The Company also continues to work on the enhancement and optimization of its Enterprise Resource Planning system and associated workflows.

Grow the business in the highest return on investment areas

The Company has been a major participant in the power systems market for many years as a supplier to several of the world’s leading power generation companies and through its large custom genset enclosure business. Continuing to build on its broad product offering, the Company received EPA certification for its 32L and 40L heavy-duty engines in 2018 and for its 53L heavy-duty engines in 2019. These heavy-duty engines provide a natural-gas-fueled power range from 500 kilowatt-electric (“kWe”) to 1.25 megawatt (“MW”), allowing the Company to serve a greater portion of the demand response, microgrid, combined heat and power, and oil and gas markets. Additionally, in 2019, the EPA granted emergency standby certification for certain diesel engines sold by the Company, which are largely designed for emergency use in critical infrastructure applications. Also, the engines can handle mission critical customer operations in the health care, data center, hospitality and transportation industries. In addition to dedicating significant R&D resources within the power systems end market, the Company has also strategically invested in expanding its management, sales and operations staff to support these efforts. The Company’s heavy-duty engines have historically provided better margins.

Capitalize on key market trends

The Company’s breadth of products and solutions will enable it to capitalize on numerous market trends that it believes have the potential to drive customer demand for its products and contribute toward its long-term growth. Further, the Company’s R&D activity is largely focused on expanding its solutions to further address trends in these areas. The key trends include the following:

•the worldwide growth of intermittent sources of energy, such as wind and solar, and an aged electric grid in the United States, coupled with power outage activity due to weather or power shutdowns, are driving increased demand for generators, microgrids and demand response equipment;

•stringent regulations and growing efforts to reduce emissions are driving demand for clean energy and alternatives to diesel power engines in several markets such as the power generation market for microgrids, oil and gas applications, and arbor care markets, among others;

•growth in data centers and their increasing demand for electricity, which is driving growth for backup power (commercial generators/microgrids);

•growth in e-commerce activity around the world, which is driving demand for last-mile delivery vehicles; and

•the availability of automotive engines that are suited for industrial application.

New product expansion by leveraging deep industry experience

Throughout the Company’s history, it has evolved from a provider of diesel power systems to becoming a major supplier of power systems fueled by alternatives to diesel, including gasoline, propane, and natural gas, among others. By leveraging the

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deep industry experience of its engineering and new-product development teams, the Company is continuing to take steps to broaden the range of its power system product offerings, including engine classes, power ratings and the OEM and direct user market categories into which it supplies products. The Company plans to capitalize on its technologically sophisticated, in-house design, prototyping, testing and application engineering capabilities to further refine its superior power system technology. Due to increasing demand for new energy and latest market trends, the Company continues to offer battery packs for its industrial market.

Leverage the Company’s relationship with Weichai

In March 2017, the Company and Weichai executed a strategic collaboration agreement (the “Collaboration Agreement”) under which they have been working together to accelerate market opportunities for each company’s respective product lines across various geographic and end-user markets. On March 22, 2023, the Collaboration Agreement was extended for an additional term of three years, expiring in March 2026. The Company received a renewal notice from Weichai and is in the process of negotiating the renewal of the Collaboration Agreement; however, no formal extension has been executed as of the date of this filing.

The Collaboration Agreement provides the Company with strategic benefits and opportunities, including the ability to leverage Weichai’s strengths and capabilities in R&D, manufacturing, procurement and distribution and its widespread sales channels in China and other emerging markets. This collaboration has enabled the Company to broaden its existing product portfolio, improve material quality, decrease costs, accelerate the development of new products and bring them to market, and expand access and exposure to new markets.

Also, through the Company’s relationship with Weichai, it has access to Weichai’s ‘New Energy’ product portfolio and is exploring product diversification opportunities in the areas of battery storage and electrification.

Expand global business

Through the expansion of its product lineup and the entry into new markets, the Company has a history of growing its product offerings internationally beyond North America. The Company sees long-term opportunity in continuing to grow its business worldwide with further R&D investment including new-product development and offerings. In January 2022, PSI and Société Internationale des Moteurs Baudouin (“Baudouin”), a subsidiary of Weichai, entered into an international distribution and sales agreement which enables Baudouin to bring PSI’s power systems line of products into the European, Middle Eastern, and African markets, which resulted in $1.2 million of sales during the year ended December 31, 2025. Beginning January 2024, this agreement automatically extends for additional one-year terms unless notice is given by one of the parties. In addition to sales, Baudouin will manage service, support, warranty claims, and technical requests. The Company believes that this agreement will continue to offer enhanced global growth opportunities, particularly in Europe.

Sales and Marketing

The Company employs a direct sales and marketing approach to maintain maximum interface with and service support for its OEM customers. This direct interface incorporates the corporate internal technical sales representatives. The Company complements its direct OEM relationships with a localized, independent sales and product support organization. This localized sales and support organization provides the necessary knowledge of local customs and requirements while also delivering immediate sales assistance and customer support.

The Company has invested in and is focused on capturing aftermarket sales of the value-added components that are included in its power systems. With a significant portion of the selling prices of the Company’s power systems coming from value-added components, this is a large, continuing growth opportunity for its aftermarket business.

Customers

The Company’s customers primarily include global OEMs and direct end-users across a wide range of applications that demand high product quality, best-in-class engineering support and on-time delivery. Within several applications for which the Company provides solutions, it maintains supplier relationships with customers, which are often among the largest in that category.

The Company’s largest customer represented 20% of consolidated net sales in 2025. The largest customer changes from time to time as a result of various factors, including prevailing market conditions, customers’ strategies and inventory of the Company’s power systems.

Competition

Each of the Company’s end markets have a variety of competitors, including engine manufacturers, independent suppliers and distributors of engines, fuel systems and component providers, manufacturers of power generation equipment, engine packagers

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and integrators, and the in-house operations of certain OEMs, some of which have longer operating histories, strong brand recognition and significantly greater financial and marketing resources.

Notwithstanding significant competition, the Company believes that the following factors provide it with a differentiated value proposition that allows the Company to compete effectively:

•fuel-agnostic strategy;

•demonstrated expertise in off-road applications;

•ability to leverage Weichai’s strengths and capabilities;

•completeness and comprehensiveness of engines and power systems;

•expansive product integrations, including electronics, controls, fuel systems and transmissions;

•commonality of technology platform spanning all product lines;

•emissions regulation compliance and certification;

•breadth and depth of advanced engineering disciplines;

•industry-leading product and application engineering;

•competitive pricing/cost;

•ability to tailor power systems to specific customer needs;

•performance and quality;

•speed to market; and

•customer support and service.

Manufacturing

The Company manufactures and assembles its products at facilities in suburban Chicago, Illinois, as well as in Darien and Beloit, Wisconsin, and customizes its power systems to meet specific requirements of OEM applications and the needs of its OEM customers. The Company has invested in precision computer numerical control (“CNC”) machining equipment to finish its internally designed engine blocks and cylinder heads, which are cast by various suppliers. The manufacturing lines in the Company’s production facilities are technologically sophisticated, lean, agile and flexible, and the Company allocates production capacity on its mixed model manufacturing lines to accommodate the demand levels and product mix required by its OEM customers.

The Company focuses on safety, people, quality, on-time delivery, cost and environment in its manufacturing operations. The Company is certified to the most recent International Organization for Standardization (“ISO”) standard, ISO 9001: 2015. The ISO 9000 family of quality management standards, which must be met in order to become ISO certified, is designed to help organizations monitor and improve the quality and delivery of their products and/or services to their customers. The Company uses tools such as Six Sigma, Lean Manufacturing, 80/20, Value Stream Mapping and other manufacturing engineering strategies to help manage its business, build quality, drive performance and continually improve culture within the manufacturing operations’ teams. The Company also uses a customer relationship management database to help collect customer feedback and to track overall quality performance at its OEM customers. Structured staff training is a constant priority and includes closed-loop quality monitoring and feedback systems.

Research, Development and Engineering

The Company’s research, development and engineering programs are focused on new product development and enhancements to current products, in addition to performance and quality improvements across its product lines. Its efforts are market driven, with the sales team identifying and defining market requirements and trends and its engineering and new-product development groups reviewing existing power system portfolios and developing new solutions that build upon the technology within that portfolio.

The Company’s product and application development engineering teams include in-house mechanical and electrical engineering functions, including advanced engine modeling, simulation, analysis and testing. Internal resources are supplemented with engineering outsourcing relationships for design, development and product testing. In addition to these engineering outsourcing relationships, the Company benefits from the design, development and testing capabilities of its supplier base. The Company staffs its engineering support activities associated with released product and component sourcing programs with dedicated internal engineering personnel.

Research, development and engineering expenditures include salaries, contractor fees, building costs, utilities, testing, information technology and administrative expenses and are expensed, net of contract reimbursements, when incurred. From time to time, the Company enters into agreements with its customers to fund a portion of the research, development and engineering costs of a particular project. These reimbursements are accounted for as a reduction of the related research, development and engineering expenditure. The Company’s net research, development and engineering expenditures for 2025 and 2024 were $18.2 million and $20.1 million, respectively.

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Supplier Relationships

In addition to producing its own engines, the Company has established relationships with its suppliers for certain engines that are integrated into the Company’s comprehensive power systems, the most significant of which are HD Hyundai Infracore Co., LTD (“HD Hyundai”), a subsidiary of HD Hyundai, Shenyang Packson Technology Co., LTD. (“SPY”), Chongqing Duchengrongfeng Mechanic Manufacture Co., Ltd (“CDM”) and Weichai. The Company also sources other power system components and coordinates design efforts with third-party suppliers for some of its key components. In general, the prices at which the Company purchases engines, components and other raw materials are based on market factors, including the prices offered by other suppliers operating in the same market and the prevailing market prices of raw materials.

The Company aggregates product sourcing efforts across its large and diverse OEM customer base and across industry categories, capitalizing on volume, economies of scale and global supply opportunities. The Company’s customers benefit from the aggregation of its global sourcing, procurement, and assembly and services, obtaining cost benefits that they might not obtain if they were to rely on their own internal resources, capabilities and more limited demand requirements. Through this process, customers are able to streamline their supply base by consolidating procurement and assembly efforts down to a single part number product supplied by the Company. The Company delivers this assembly to its customers’ production lines ready to install into the customers’ product.

The Company is party to a nonexclusive supply agreement with HD Hyundai, under which it purchases and distributes specified HD Hyundai engines within a territory consisting of the United States, Canada and Mexico with no minimum product purchase commitments. Beginning in 2024, the supply agreement automatically extends for additional one-year terms unless a notice of termination is provided by either party six months prior to the scheduled expiration.

In November 2023, the Company entered into a supply agreement with CDM, for the exclusive purchase and distribution of engines in North and South America, in the industrial and power system markets. The Company entered into this supply agreement to source certain engines previously supplied by Shenyang Aerospace Mitsubishi Motors Engine Manufacturing Co., Ltd. (“SAME”), whose ability to supply product was suspended because of the intensified enforcement and expansion of the UFLPA near the end of 2023. Beginning December 2024, the supply agreement automatically extends for additional one-year terms unless a notice of termination is provided by either party six months prior to scheduled expiration.

In November 2023, the Company also entered into a supply agreement with SPY, for the exclusive purchase and distribution of engines in North and South America, in the industrial and power system markets. The Company entered into this supply agreement to source certain engines previously supplied by SAME, whose ability to supply product was suspended because of the intensified enforcement and expansion of the UFLPA near the end of 2023. Beginning December 2024, the supply agreement automatically extends for additional one-year terms unless a notice of termination is provided by either party six months prior to scheduled expiration.

Product Support

The Company’s dedicated team of product and application engineers enables it to deliver high-quality, responsive technical support to its OEM and end-user customers. The Company provides technical support and training to its customers, including in-plant training and support through web and phone-based field service. The Company further supports its customers by engaging regional providers to perform warranty services and offer support for its power systems. The Company also leverages its technical resources to provide service and support functions for its power systems sold to OEM customers.

Backlog

Backlog generally is not considered a significant factor in the Company’s business.

Employees and Human Capital

As of December 31, 2025, the Company’s workforce consisted of approximately 1,000 full-time employees. None of the members of the Company’s workforce are represented by a union or covered by a collective bargaining agreement.

Company values include focusing on developing and maintaining a world class workforce through personal accountability, teamwork, customer service and innovation. The Company monitors and manages attrition. It approves, through its human resources department, the replacement of key positions that it believes are critical to sustaining improved business performance and analyzes departure data to continually improve upon the experience of employees. Turnover for salaried employees in 2025 was approximately 18.0%.The Company’s talent management and succession planning process includes the identification of key positions based on current and future business strategies, the identification of potential successors, and a plan for talent development.

The Company focuses on attracting and retaining the best employees by providing market competitive pay and benefits. This ensures sustainability of the organization. The Company’s short-term and long-term incentive plans are designed to provide a variable pay opportunity to reward the attainment of key financial and operational goals as well as shareholder value creation.

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In addition to the base and variable pay plans, the Company offers employees other benefits including medical, paid-time off, and retirement savings plans.

Health and safety are also a key priority, as the Company is committed to removing conditions that cause personal injury or occupational illness. Employees participate in training sessions focused on these topics and are encouraged to promote behaviors that protect others from risk of injury. The Company sets annual targets for its Total Recordable Incident Rate (“TRIR”) and Days Away, Restricted or Transferred (“DART”) and regularly reviews these metrics. For 2025, the Company achieved an overall TRIR of 7.42, meaning that for every 100 full-time employees, 7.42 employees incurred an injury that resulted in recordable medical treatment. The DART Rate was 4.22 in 2025, meaning that for every 100 full-time employees, 4.22 individuals experienced an incident that resulted in lost time or modified duty.

Environmental Matters

The Company’s reporting facilities follow the guidelines required for its federally enforceable state operating permits (FESOP) used with the Illinois Environmental Protection Agency (IEPA), and the Wisconsin Department of Natural Resources (WDNR) Type-B permit guidelines. This includes monitoring the emissions produced from these locations as part of the requirements within the states where PSI operates. A majority of PSI's current production utilizes traditional utility supply. PSI’s production processes that require product testing rely on liquid propane and natural gas fuels, which produce lower emissions than diesel and gasoline.

The Company is committed to producing high quality products that provide reduced emissions and to operating its facilities in a manner that mitigates their impact on the environment.

For the full year ended 2025, approximately 74% of the engines sold run on either propane or natural gas. Also, the Company has taken the following steps to enhance its sustainability:

•updated most of the interior/exterior lighting in its buildings to LED lighting. As lamps or fixtures burn out or require replacement, they are converted to LED (if not already) as a measure of energy conservation;

•recycling of certain materials including cardboard, metal, wood scrap, used oil and antifreeze, and metal processing coolants and lubricants reclamation;

•reduced loaded hot testing of large displacement engines due to quality improvements (reduces noise, emissions and fuel consumption)

The Company intends to continue exploring additional avenues for greater sustainability through new product development and the exploration of additional operational opportunities.

Impact of Government Regulation

The Company’s power systems are subject to extensive statutory and regulatory requirements that directly or indirectly impose standards governing exhaust emissions, evaporative emissions, greenhouse gas (“GHG”) emissions and noise. The Company’s power systems are subject to compliance with regulatory standards imposed by the EPA, state regulatory agencies in the United States, including CARB, and other regulatory agencies around the world. Although as of January 1, 2024, the Company no longer sells engines into the on-road market, because its engines are still sold into the off-road market, the Company must ensure certification to the specific regulations within the applicable statutory segment. For products sold into the U.S. market, both EPA and CARB have imposed specific regulations on engines used in off-road equipment. These regulations generally serve to restrict exhaust emissions, with a primary focus on oxides of nitrogen, hydrocarbons and carbon monoxide. Exhaust emission regulations for engines used in off-road industrial and power generation equipment vary based upon the use of the equipment into which the engine is incorporated (such as stationary power generation or mobile off-highway industrial equipment) and the type of fuel used to drive the power system. The Company continues to make significant investments into the necessary intellectual property that supports full compliance of the Company’s engines now and into the foreseeable future.

The first EPA emissions regulations adopted for diesel engines, known as Tier 1, applied to diesel engines used in mobile off-highway applications in the U.S., and similar standards for diesel engines, known as Stage I regulations, were implemented thereafter in the EU. The EPA and applicable agencies in the EU have continued to develop emissions regulations for diesel engines in the U.S. and the EU, respectively, and have adopted more restrictive standards. The current diesel engine emission requirements in the U.S are known as Tier 4 and are applicable to off-road diesel engines used in industrial equipment. Similarly, the EU has adopted more restrictive standards under its Stage V regulations. Tier 4 and Stage V regulations call for reductions in levels of particulate matter and oxides of nitrogen.

The initial and ongoing certification requirements vary by power system application and market segment. Each application must undergo a series of rigorous and demanding tests to demonstrate compliance with regulatory standards, including useful life, zero hours and durability testing. Once a power system is certified, regulatory agencies impose ongoing compliance requirements, which include testing newly produced power systems on a regular quarterly schedule to ensure ongoing compliance with applicable regulations. In addition, there are field audit requirements, which require the removal of power

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systems from service at specified stages of their useful lives to perform confirmatory exhaust emissions testing and/or on-board diagnostic (“OBD”) system audits and testing. All of the Company’s emission-certified power systems meet existing exhaust emission standards of the EPA and CARB. Failure to comply with these standards could result in materially adverse effects on the Company’s future financial results.

Information about the Company’s Executive Officers

The following selected information for each of the Company’s current executive officers was prepared as of February 26, 2026.

C. (Dino) Xykis was appointed as the Chief Executive Officer on April 24, 2023, after serving as Interim CEO since June 2, 2022. Mr. Xykis also served as the Company’s Chief Technical Officer from March 15, 2021 until July 9, 2024. He is responsible for the oversight of the Company and its advanced product development, engineering design and analysis, on-highway engineering, applied engineering, emissions and certification, Waterford, Michigan engineering operations, program management and product strategic planning. Since joining the Company in 2010 and until his appointment as Chief Technical Officer in March 2021, Mr. Xykis served as Vice President of Engineering for the Company. He has more than 30 years of professional experience in multi-disciplined engineering areas including senior management and executive positions at various companies including Cummins Inc., a publicly traded company on the NYSE, and Generac Power Systems, a publicly traded company on the NYSE. Mr. Xykis also served as Adjunct Professor of Mechanical Engineering and Mechanics at the Milwaukee School of Engineering and previously served on the audit and compensation committees of the Board of Directors of Image Sensing Systems, a publicly traded company on Nasdaq, from 1996 to 2001. Mr. Xykis has also served on the advisory board of Civil, Environmental, and Geo-Engineering, College of Science and Engineering, University of Minnesota for the past eight years. Mr. Xykis holds a Bachelor’s degree in Structural Engineering, a Master’s degree in Vibration/Dynamics, and a PhD. in Structural/Applied Mechanics from the University of Minnesota, Minneapolis.

Xun (Kenneth) Li was appointed Chief Financial Officer of Power Solutions International, Inc. on August 26, 2022. As Chief Financial Officer, Mr. Li has responsibility for the Company’s finance, accounting, financial planning and analysis, treasury, tax, risk management, internal audit, and related functions, and supports the Chief Executive Officer and Board of Directors on financial and strategic matters. From 2020 to August 2022, Mr. Li served as Chief Financial Officer of ND Paper, a pulp, packaging, and paper company. He was a member of the executive leadership team with responsibility for finance and accounting functions and strategic planning. From 2008 to 2020, Mr. Li held financial leadership positions at Caterpillar Inc., a publicly traded company, including serving as Chief Financial Officer of machine product group from 2013 to 2020. From 2003 to 2008, Mr. Li held finance leadership roles at Ford Motor Company, a publicly traded company. Mr. Li holds a Master of Business Administration with high distinction and a Master of Science in Accounting from the University of Michigan, a Master of Science in Mechanical Engineering from the University of Oklahoma, and a Bachelor of Science in Mechanical Engineering from Shanghai Jiao Tong University. He is a Certified Public Accountant in the state of Illinois.

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Zhaoying (Dorothy) Du was appointed General Counsel and Corporate Secretary of Power Solutions International, Inc. on September 15, 2025. As General Counsel and Corporate Secretary, Ms. Du has responsibility for the Company's legal affairs, corporate governance, compliance, risk management, securities, and related functions, and supports the Chief Executive Officer and Board of Directors on legal and strategic matters. Ms. Du has 20 years of experience providing strategic legal counsel to U.S. and multinational companies, leading initiatives to address complex commercial and regulatory matters, helping businesses manage risks, drive innovation, and implement pragmatic legal solutions that support business success. From March 2025 to September 2025, Ms. Du led the global supply chain legal team of Lenovo, a publicly traded company. She was a member of the Lenovo global supply chain executive leadership team, advising on procurement, factory setup, trade compliance, regulatory risks, and contract negotiations across global operations. From February 2016 to March 2025, Ms. Du served as Global Head of Legal of Motorola Mobility, a Lenovo company, where she was a member of the executive leadership team, overseeing matters including artificial intelligence, R&D, commercial contracts, intellectual property, compliance, data privacy and information security, corporate governance, corporate secretary, litigation, and other legal functions. From 2013 to 2016, she served as General Counsel of the China operations and Senior Counsel for compliance and risk management at The Warranty Group (now part of Assurant, Inc.). From 2005 to 2012, Ms. Du served as Co-Chair of the APAC Practice Group at Freeborn & Peters (now part of Smith, Gambrell & Russell, LLP) and as an attorney at Sonnenschein Nath & Rosenthal, LLP (now Dentons LLP), advising on cross-border transactions, securities, corporate governance, mergers and acquisitions, financing, compliance, and other complex matters. Ms. Du holds a Juris Doctor degree from the University of Missouri - Kansas City School of Law, a Master of Arts degree in Political Science from the University of Georgia, and a Bachelor of Law degree from Sun Yat-Sen University Law School. She is licensed to practice law in Illinois and is admitted to practice law in China.