New online purchasing capabilities support broader market adoption; Company to showcase LaserSlat SAVER at FABTECH® 2026 and EuroBLECH 2026

LaFox, IL | October 19, 2026 – Richardson Electronics, Ltd. (NASDAQ: RELL), a global leader in the aftermarket of industrial laser consumables, today announced the launch of e-commerce capabilities for select LaserSlat SAVER^® products on rellaser.com, expanding the Company’s digital sales capabilities and providing U.S. customers with a more direct and convenient purchasing option. The Company also announced that LaserSlat SAVER is now available across a broad range of European markets.

LaserSlat SAVER is Richardson Electronics’ eco-friendly preventative maintenance solution designed to help reduce slag buildup on laser cutting machine slats. By helping maintain cleaner slats, the solution supports consistent cutting performance, reduces maintenance requirements, minimizes downtime, and extends the useful life of laser cutting table components. LaserSlat SAVER is compatible with all laser cutting machines and performs effectively on high-power fiber lasers up to 100 kW.

Adding online purchasing expands Richardson Electronics’ digital sales capabilities and provides an additional channel to reach customers in the laser-cutting market. The e-commerce functionality complements the Company’s existing direct sales and technical support capabilities and makes it easier for U.S. customers to research and purchase select LaserSlat SAVER products online. Expanded availability across European markets provides more European fabricators access to the product through Richardson Electronics’ established European infrastructure and supports the Company’s strategy to grow its recurring consumables business.

“Expanding our digital sales capabilities and European availability gives more customers convenient access to LaserSlat SAVER and helps us broaden the product’s reach in the laser cutting market,” said Claudio Schutz, Vice President and General Manager of the Industrial Components Group at Richardson Electronics. “We see continued opportunity to build awareness and adoption of LaserSlat SAVER among fabricators seeking to reduce maintenance, increase uptime, ensure part quality, and maximize equipment utilization.”

Richardson Electronics will showcase LaserSlat SAVER at EuroBLECH 2026, October 20–23, 2026, at the Hanover Exhibition Grounds in Hanover, Germany. The Company will exhibit at Booth 11-F166, where attendees can learn more about LaserSlat SAVER and the Company’s expanding portfolio of premium aftermarket parts and consumables for industrial laser systems. Richardson Electronics will also showcase LaserSlat SAVER at FABTECH 2026, October 21–23, 2026, at the Las Vegas Convention Center in Las Vegas, Nevada. The Company will exhibit at Booth C2422, where attendees can meet with Richardson Electronics’ laser experts and learn how LaserSlat SAVER, power grid tubes, and a broad portfolio of laser consumables, including laser optics, nozzles and accessories, dust collection filters, bellows, service parts, and other consumables for industrial laser systems, can support preventive maintenance programs and operational performance for CO2 and fiber laser cutting equipment.

FABTECH is North America’s largest metal forming, fabricating, welding, and finishing event, and EuroBLECH is a leading international exhibition for sheet metal working. Both events provide Richardson Electronics with an opportunity to engage directly with manufacturers and fabricators seeking technologies that can improve equipment productivity, reduce operating costs, and extend equipment life.

For more information about LaserSlat SAVER and Richardson Electronics’ laser products and solutions, to purchase select products online in the U.S., or to confirm availability in your European market, visit www.rellaser.com.

About Richardson Electronics, Ltd.

Richardson Electronics, Ltd. is a leading global manufacturer of engineered solutions, green energy products, power grid and microwave tubes and related consumables; power conversion and RF and microwave components; CT X-ray tubes; and customized display solutions. More than 50% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts, Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our supplier code of conduct. We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair through its global infrastructure. More information is available at www.rell.com.

Richardson Electronics, Ltd. common stock trades on the NASDAQ Global Select Market under the ticker symbol RELL.

About Richardson Electronics – Power & Microwave Technologies

For over 75 years, Richardson Electronics has been your industry-leading global provider of engineered solutions, RF & microwave, and power products. The Power & Microwave Technologies group continues this legacy and complements it with new products from the world’s most innovative technology partners. Richardson Electronics’ Power & Microwave Technologies group focuses on what we do best: identify and design disruptive technologies, introduce new products on a global basis, develop solutions for our customers, and provide exceptional worldwide support. As a global company, we provide solutions and add value through design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair—all through our existing global infrastructure. More information is available at rellpower.com | relltubes.com | rellaser.com.

3YO Technology:

3YO Technology provides specialized, 100% natural and certified biodegradable liquids designed to protect sheet metal surfaces during industrial laser cutting, plasma cutting and welding. Our solutions aim to improve performance, increase productivity while removing hazardous products from factories. At 3YO Technology, we believe the future of industrial operations lies in natural, high-performance solutions and systems, safe for people, effective for business, and respectful of the planet. More information is available at www.3YOTechnology.com

Backed by a REV Act incentive, local manufacturer to expand operations and scale production of commercial battery energy storage systems

LA FOX, Ill. (Oct. 12, 2026) — ComEd and Richardson Electronics, Ltd. (NASDAQ: RELL) today joined state and industry leaders to announce Richardson Electronics’ expanded manufacturing of locally produced battery energy storage systems and plans to install its first onsite battery energy storage system demonstration project.

This initiative is a critical step toward scaling locally made battery energy storage solutions that strengthen grid reliability, support renewable energy integration, and store energy for use during periods of high demand while helping ease supply-related energy costs.

“For generations, manufacturing has been part of northern Illinois’ identity, and Richardson’s announcement demonstrates how that sector continues to shape our region’s economic future,” said ComEd President and CEO Gil Quiniones. “ComEd is committed to supporting business growth by making the grid investments needed to deliver industry-leading reliability at rates that are well below the average commercial and industrial rates for the top 20 largest metropolitan areas.”

Richardson, a legacy manufacturer based in La Fox, is currently building the largest commercial battery storage system in Illinois. Its planned operational expansion will help scale the development and distribution of these products. Richardson is installing a 5-MWh research and development demonstration project, supported through the ComEd interconnection process.

“Richardson Electronics has a long history of solving complex power and energy challenges through innovation and U.S.-based manufacturing,” said Greg Peloquin, Executive Vice President and General Manager of Power & Microwave Technologies and Green Energy Solutions groups. “Our advanced energy storage solutions will help customers manage energy more efficiently while supporting a more reliable and resilient grid. We value ComEd’s collaboration in bringing this onsite demonstration project to life.”

The initiative is also supported by the Reimagining Energy and Vehicles in Illinois, or REV Illinois, program, which is helping Richardson Electronics strengthen its La Fox operations, advance energy technology manufacturing and support continued economic growth in Illinois.

“As demand for reliable and affordable energy increases, Illinois has an opportunity not only to deploy new technologies, but to manufacture them,” said Illinois Economic Development Corporation President and CEO Christy George. “Richardson Electronics’ expansion demonstrates how Illinois’ manufacturing expertise can drive growth in emerging industries like battery storage while helping strengthen the energy infrastructure that supports our economy.”

Increasing battery energy storage is a key component of Illinois’ recently enacted Clean and Reliable Grid Affordability Act (CRGA), which seeks to strengthen grid reliability and help address forecasted energy supply shortfalls. By storing electricity for use during periods of peak demand, battery storage can support a more resilient grid, integrate additional clean energy resources, and help ensure Illinois has the energy capacity needed to power future economic growth.

“Safe, reliable and affordable energy is critical to the success of Illinois’ manufacturing sector and will require new generation, transmission investment and new technologies such as battery storage,” said Mark Denzler, President & CEO of the Illinois Manufacturers’ Association. “Richardson Electronics and ComEd’s announcement of a next-generation 5 MWh commercial battery storage system is a great example of manufacturing innovation and ingenuity that will help drive growth and economic development in Illinois.”

Battery energy storage systems can charge when electricity is available and discharge when it is needed, helping customers manage energy use and support a more flexible electric system. Depending on how they are configured, batteries can also provide backup capabilities, reduce demand during peak periods, and support the integration of renewable energy resources.

“When Kane County Commissioner Rick Williams and I first met with Richardson to discuss this project, I was immediately intrigued by both the economic and energy benefits the project could bring to the area and the state,” said State Representative Dan Ugaste (65th District). “Energy storage will be an important part of having affordable and reliable energy going forward. Seeing the value this project could bring, I was glad to help facilitate discussions with the Department of Commerce and Economic Opportunity to bring this project to fruition.”

ComEd is supporting the project through its customer interconnection process and engineering studies. The company’s work includes helping prepare the site for the demonstration system and guiding Richardson through any potential system upgrade needs. This work will help to safely and reliably connect the demonstration system while maintaining service for surrounding customers. Projects like these are also eligible to apply for ComEd’s Distributed Generation Rebate Program, which recently hit a $350 million milestone. ComEd customers installing qualifying battery storage can receive an upfront rebate of up to $300 per kilowatt-hour of storage capacity. For example, a typical 13.5-kWh home battery could qualify for a rebate of about $4,050.

“Richardson Electronics’ continued investment in La Fox is a great example of how Illinois businesses can lead the way in developing innovative energy solutions while creating good-paying jobs right here in our communities,” said State Representative Jeff Keicher (70th House District). “As Illinois works to strengthen the reliability and affordability of our electric grid, projects like this will play an important role in ensuring we meet our future needs, while strengthening our state’s position as an advanced manufacturing leader.”

Throughout its 80-year history, Richardson Electronics has evolved from a traditional tube or electron device manufacturer into a leader in advanced energy technologies, with a growing focus on energy storage and clean energy applications. Richardson Electronics is the largest supplier of pitch energy modules for wind turbines in North America. Through strategic partnerships with companies such as Gotion Illinois, Richardson Electronics offers advanced BESS platforms in several sizes, including 211-kWh, 422-kWh, and 760-kWh systems for commercial use, as well as a 5-MWh system for large-scale utility deployments

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ComEd is a unit of Chicago-based Exelon Corporation (NASDAQ: EXC), a Fortune 200 energy company, serving almost 11 million electricity and natural gas customers – the largest number of customers in the U.S. ComEd powers the lives of more than 4.2 million customers across northern Illinois, or 70 percent of the state’s population. For more information visit ComEd.com, and connect with the company on Facebook, Instagram, LinkedIn, X, and YouTube.

First quarter net sales increased 18.9% year over year, with growth across all three business units

First quarter net income increased 112.6% to $4.1 million, or $0.27 per common share (diluted)

Company generated free cash flow of $4.2 million for first quarter

Backlog at August 29, 2026 was $184.4 million, up 36.9% year-over-year

Read the full press release here

LAFOX, Ill., September 30, 2026 (GLOBE NEWSWIRE) — Richardson Electronics, Ltd. (NASDAQ: RELL) plans to release its financial results for its first quarter ended August 29, 2026 after the close of business on Wednesday, October 7, 2026. The release will be distributed by GlobeNewswire and will be available on the Company’s website at www.rell.com.

On Thursday, October 8, 2026, at 9:00 a.m. Central Time, Edward J. Richardson, Chairman and Chief Executive Officer, and Robert J. Ben, Chief Financial Officer, will host a conference call to discuss the Company’s first quarter fiscal year 2027 results. A question-and-answer session will be included as part of the call’s agenda.

Participant Instructions

Participants may register for the call here. While not required, it is recommended you join 10 minutes prior to the event start. A replay of the call will be available beginning at 1:00 p.m. Central Time on October 8, 2026, for seven days. Registration instructions are also on our website at www.rell.com.

In addition, the webcast link is available here .

About Richardson Electronics, Ltd.

Richardson Electronics, Ltd. is a leading global manufacturer of engineered solutions, green energy products, power grid and microwave tubes, and related consumables; power conversion and RF and microwave components including green energy solutions; tubes for diagnostic imaging equipment; and customized display solutions.

More than 55% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts, or Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our Supplier Code of Conduct. We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific, and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair through its global infrastructure. More information is available at www.rell.com.

Richardson Electronics’ common stock trades on the NASDAQ Global Select Market under the ticker symbol RELL.

LaFox, IL | September 15, 2026 – Richardson Electronics, Ltd. (NASDAQ: RELL), a global provider of engineered solutions for the green energy, power management, and custom display markets, will participate in a webcast presentation and host one-on-one meetings with investors at the Lytham Partners Fall 2026 Investor Conference, taking place virtually on September 29-30, 2026.

Company Webcast

The webcast presentation will take place at 2:00 p.m. ET on Tuesday, September 29, 2026. The webcast can be accessed by visiting the conference website at https://lythampartners.com/fall2026/ or directly at https://app.webinar.net/vdG7YOZxaAm. The webcast will also be available for replay following the event.

1×1 Meetings

Management will be participating in virtual one-on-one meetings throughout the event. To arrange a meeting with management, please contact Lytham Partners at 1×1@lythampartners.com or register for the event at https://lythampartners.com/fall2026invreg/.

About Richardson Electronics, Ltd.

Richardson Electronics, Ltd. is a leading global manufacturer of engineered solutions, green energy products, power grid and microwave tubes, and related consumables; power conversion and RF and microwave components including green energy solutions; tubes for diagnostic imaging equipment; and customized display solutions. More than 55% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts, or Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our Supplier Code of Conduct. We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific, and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair through its global infrastructure. More information is available at www.rell.com. Richardson Electronics’ common stock trades on the NASDAQ Global Select Market under the ticker symbol RELL.

Forward-Looking Statements

This release includes certain “forward-looking” statements as defined by the Securities and Exchange Commission. Statements in this press release regarding the Company’s business that are not historical facts represent “forward-looking” statements that involve risks and uncertainties. For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see Item 1A, “Risk Factors” in the Company’s Annual Report on Form 10-K filed on August 3, 2026, and other reports we file with the Securities and Exchange Commission. The Company assumes no responsibility to update the “forward-looking” statements in this release as a result of new information, future events or otherwise.

Multi-million-dollar program includes an 18-system, 7 MWh deployment, demonstrating growing energy storage capabilities

LaFox, IL | August 20, 2026 – Richardson Electronics, Ltd. (NASDAQ: RELL), a global provider of engineered solutions for renewable energy and other power management applications, today announced that, in collaboration with its technology partners, it will deliver 18 customized battery energy storage systems (BESS) for deployment across seven remote communities in Alaska. The multi-million-dollar program represents another significant deployment for Richardson’s growing energy storage business and demonstrates the Company’s ability to combine its engineering capabilities with complementary technologies to address complex power management applications.

As remote communities in Alaska work to strengthen energy resilience and improve the reliability of their power infrastructure, renewable energy and energy storage technologies are becoming increasingly important. Working in collaboration with its technology partners, Richardson Electronics has developed customized energy storage solutions designed to operate reliably in Alaska’s challenging climate and extreme temperatures. The systems will provide a combined energy storage capacity of 7 MWh, with project completion expected by the end of 2027. Each system is being engineered to meet the unique energy requirements of its respective community, with a focus on performance, reliability, and operation in demanding environmental conditions.

“This project demonstrates Richardson Electronics’ ability to leverage our engineering expertise and technology partnerships to deliver innovative energy storage solutions for challenging applications,” said Greg Peloquin, Executive Vice President and General Manager of Power & Microwave Technologies and Green Energy Solutions groups. “The deployment also represents another important step in the continued growth of our battery energy storage business. By combining our engineered solutions capabilities with complementary technologies, we are well positioned to pursue opportunities where reliability, customization, and technical expertise are critical.”

The project further demonstrates Richardson Electronics’ expanding capabilities in the energy storage market and its ability to deliver customized solutions for demanding applications. By combining its engineering, manufacturing, and systems integration expertise with complementary technologies from its partners, Richardson is positioned to address a broad range of energy storage and power management requirements while supporting more reliable and resilient power infrastructure from Illinois to Alaska.

About Richardson Electronics, Ltd.

Richardson Electronics, Ltd. is a leading global manufacturer of engineered solutions, green energy products, power grid and microwave tubes and related consumables; power conversion and RF and microwave components; CT X-ray tubes; and customized display solutions. More than 50% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts, or Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our supplier code of conduct. We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair through its global infrastructure. More information is available at www.rell.com.

Richardson Electronics, Ltd. common stock trades on the NASDAQ Global Select Market under the ticker symbol RELL.

About Richardson Electronics – Green Energy Solutions

Richardson Electronics Green Energy Solutions combines our key technology partners and engineered solutions capabilities to design and manufacture key products for the fast-growing energy storage market and power management applications. As a designer, manufacturer, technology partner, and authorized distributor, GES’s strategy is to provide specialized technical expertise and engineered solutions using our core design engineering and manufacturing capabilities on a global basis. We provide solutions and add value through design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair—all through our existing global infrastructure. GES focuses on products for numerous green energy applications such as wind, solar, hydrogen, and electric vehicles and other power management applications that support green solutions such as synthetic diamond manufacturing. For more information, visit us at https://www.rell.com/greenenergysolutions/.

Forward-Looking Statements

This release includes certain “forward-looking” statements as defined by the Securities and Exchange Commission. Statements in this press release regarding the Company’s business that are not historical facts represent “forward-looking” statements that involve risks and uncertainties. For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see Item 1A, “Risk Factors” in the Company’s Annual Report on Form 10-K filed on August 3, 2026, and other reports we file with the Securities and Exchange Commission. The Company assumes no responsibility to update the “forward-looking” statements in this release as a result of new information, future events or otherwise.

Presentation on Wednesday, August 26 at 3:00 P.M. ET / 2:00 P.M. CT

LaFox, IL | August 12, 2026 – Richardson Electronics, Ltd. (NASDAQ: RELL), a global provider of engineered solutions for the green energy, power management, and custom display markets, today announced that it will be presenting and hosting one-on-one meetings at the Midwest IDEAS Investor Conference being held at The InterContinental Chicago Magnificent Mile on August 26, 2026. Edward J. Richardson, Chairman and CEO, and Wendy Diddell, COO of Richardson Electronics, Ltd., will be giving a formal presentation in Room #3 and answering questions from investors on Wednesday, August 26 at 3:00 P.M. ET / 2:00 P.M. CT. The presentation is a webcast and can be accessed through the conference host’s main website: https://www.threepartadvisors.com/midwest and in the investor relations section of the Company’s website: www.rell.com, following the presentation.

If interested in scheduling a 1×1 session or learning more about the IDEAS conferences, please contact Lacey Wesley at (817) 769 -2373 or lWesley@IDEASconferences.com.

About Richardson Electronics, Ltd.

Richardson Electronics, Ltd. is a leading global manufacturer of engineered solutions, green energy products, power grid and microwave tubes, and related consumables; power conversion and RF and microwave components including green energy solutions; tubes for diagnostic imaging equipment; and customized display solutions. More than 55% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts, or Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our Supplier Code of Conduct. We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific, and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair through its global infrastructure. More information is available at www.rell.com. Richardson Electronics’ common stock trades on the NASDAQ Global Select Market under the ticker symbol RELL.

About IDEAS Investor Conferences

The mission of the IDEAS Conferences is to provide independent regional venues for quality companies to present their investment merits to an influential audience of investment professionals.  Unlike traditional bank-sponsored events, IDEAS Investor Conferences are “SPONSORED BY INVESTORS. FOR INVESTORS.” and for the benefit of regional investment communities.  Conference sponsors collectively have more than $200 billion in assets under management and include: 1102 Partners, Adirondack Research and Management, Allianz Global Investors: NFJ Investment Group, Aristotle Capital Boston, Ascend Wealth Advisors, Barrow Hanley Mewhinney & Strauss, Constitution Research & Management, Inc., Diamond Hill, First Wilshire Securities Management, Inc., Granahan Investment Management, Great Lakes Advisors, Greenbrier Partners Capital Management, LLC, Hodges Capital Management, Ironwood Investment Management, Keeley Teton Advisors, Luther King Capital Management, Marble Harbor Investment Counsel, North Star Investment Management, Punch & Associates, Shepherd Kaplan Krochuk, Westwood Holdings Group, Inc., and William Harris Investors. The IDEAS Investor Conferences are held annually and are produced by Three Part Advisors, LLC.  Additional information about the events can be located at www.IDEASconferences.com.

Forward-Looking Statements

This release includes certain “forward-looking” statements as defined by the Securities and Exchange Commission. Statements in this press release regarding the Company’s business that are not historical facts represent “forward-looking” statements that involve risks and uncertainties. For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see Item 1A, “Risk Factors” in the Company’s Annual Report on Form 10-K filed on August 3, 2026, and other reports we file with the Securities and Exchange Commission. The Company assumes no responsibility to update the “forward-looking” statements in this release as a result of new information, future events or otherwise.

Expanded RESS^TM portfolio strengthens Richardson Electronics’ position in the growing commercial and industrial battery energy storage systems market

LaFox, IL | August 4, 2026 – Richardson Electronics, Ltd. (NASDAQ: RELL), a global provider of engineered solutions for power, microwave, and energy storage applications, today announced the expansion of its Richardson Energy Storage Solutions (RESS™) branded portfolio with the introduction of the RESS211 and RESS422 commercial battery energy storage systems (BESS). Together with the previously introduced RESS760 platform, the Company now offers a broader portfolio of scalable energy storage solutions for a wide range of commercial and industrial (C&I) applications.

The addition of the RESS211 and RESS422 systems marks another milestone in Richardson Electronics’ strategy to expand its commercial battery energy storage system offerings. As businesses seek to reduce energy costs, improve resiliency, and modernize their electrical infrastructure, the Company’s growing RESS™ portfolio offers flexible solutions for peak demand management, backup power, renewable energy integration, and participation in utility demand response and other utility incentive programs.

Richardson Electronics delivers engineered battery energy storage system solutions tailored to each customer’s operational and infrastructure requirements. Whether customers require standalone DC battery blocks or fully integrated turnkey battery energy storage systems, the Company’s engineering expertise enables solutions configured to meet specific power, capacity, and application requirements.

With nearly 80 years of engineering and manufacturing expertise, Richardson Electronics differentiates itself by delivering more than battery systems. The Company combines engineering, system integration, manufacturing expertise, and technical support to provide customized energy storage solutions that address each customer’s unique operational requirements.

Greg Peloquin, Executive Vice President and General Manager of Power & Microwave Technologies and Green Energy Solutions at Richardson Electronics, said, “The addition of the RESS211 and RESS422 systems expands our commercial energy storage portfolio and reinforces our commitment to delivering engineered energy storage solutions for commercial and industrial customers. As the market continues to grow, we are well positioned to provide flexible, scalable solutions backed by Richardson Electronics’ engineering expertise and nearly 80 years of manufacturing excellence.”

Key benefits of the RESS™ product family include:

• Expanded portfolio with scalable 211kWh, 422kWh, and 760kWh battery energy storage systems

• Modular solutions available as standalone DC battery blocks or fully integrated turnkey systems
• Designed to help businesses reduce energy costs, improve resiliency, and optimize energy management
• Opportunities to participate in utility demand response and other grid service incentive programs, where available

The expanding RESS™ portfolio reflects Richardson Electronics’ continued investment in engineered energy storage solutions and strengthens the Company’s ability to support commercial and industrial customers as demand for reliable, flexible, and scalable battery energy storage systems continues to grow.

For more information about Richardson Energy Storage Solutions, visit www.rell.com/RESS.

About Richardson Electronics, Ltd.

Richardson Electronics, Ltd. is a leading global manufacturer of engineered solutions, green energy products, power grid and microwave tubes and related consumables; power conversion and RF and microwave components; CT X-ray tubes; and customized display solutions. More than 50% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts, or Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our supplier code of conduct. We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair through its global infrastructure. More information is available at www.rell.com.

Richardson Electronics, Ltd. common stock trades on the NASDAQ Global Select Market under the ticker symbol RELL.

About Richardson Electronics – Green Energy Solutions

Richardson Electronics Green Energy Solutions combines our key technology partners and engineered solutions capabilities to design and manufacture key products for the fast-growing energy storage market and power management applications. As a designer, manufacturer, technology partner, and authorized distributor, GES’s strategy is to provide specialized technical expertise and engineered solutions using our core design engineering and manufacturing capabilities on a global basis. We provide solutions and add value through design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair—all through our existing global infrastructure. GES focuses on products for numerous green energy applications such as wind, solar, hydrogen, and electric vehicles and other power management applications that support green solutions such as synthetic diamond manufacturing. For more information, visit us at https://www.rell.com/greenenergysolutions/.

Forward-Looking Statements

This release includes certain “forward-looking” statements as defined by the Securities and Exchange Commission. Statements in this press release regarding the Company’s business that are not historical facts represent “forward-looking” statements that involve risks and uncertainties. For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see Item 1A, “Risk Factors” in the Company’s Annual Report on Form 10-K filed on August 3, 2026, and other reports we file with the Securities and Exchange Commission. The Company assumes no responsibility to update the “forward-looking” statements in this release as a result of new information, future events or otherwise.

Fourth quarter net sales increased 27.6% year over year, with growth across all three business units

Fourth quarter GAAP net income increased 244.4% to $3.7 million, or $0.25 per common share (diluted)

Fiscal 2026 net sales increased 9.4%, marking the Company’s second consecutive year of annual sales growth

Backlog reached $164.4 million, its highest level in three years and an increase of 8.7% from the third quarter

Read the full press release here

LAFOX, Ill., July 15, 2026  — Richardson Electronics, Ltd. (NASDAQ: RELL) plans to release its financial results for its fourth quarter ended May 30, 2026 after the close of business on Wednesday, July 22, 2026. The release will be distributed by GlobeNewswire and will be available on the Company’s website at www.rell.com.

On Thursday, July 23, 2026, at 9:00 a.m. Central Time, Edward J. Richardson, Chairman and Chief Executive Officer, and Robert J. Ben, Chief Financial Officer, will host a conference call to discuss the Company’s fourth quarter fiscal year 2026 results. A question-and-answer session will be included as part of the call’s agenda.

Participant Instructions

Participants may register for the call here. While not required, it is recommended you join 10 minutes prior to the event start. A replay of the call will be available beginning at 1:00 p.m. Central Time on July 23, 2026, for seven days. Registration instructions are also on our website at www.rell.com.

In addition, the webcast link is available here.

About Richardson Electronics, Ltd.

Richardson Electronics, Ltd. is a leading global manufacturer of engineered solutions, green energy products, power grid and microwave tubes, and related consumables; power conversion and RF and microwave components including green energy solutions; tubes for diagnostic imaging equipment; and customized display solutions.

More than 55% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts, or Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our Supplier Code of Conduct. We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific, and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair through its global infrastructure. More information is available at www.rell.com.

Richardson Electronics’ common stock trades on the NASDAQ Global Select Market under the ticker symbol RELL.