Richardson Electronics, Ltd. and Ioxus Sign Global Distribution Agreement

Builds market awareness of Ioxus’ innovative ultracapacitor products and technology

LaFox, IL, Wednesday, July 15, 2015 – Richardson Electronics, Ltd. (NASDAQ: RELL) announced today a new global distribution agreement with Ioxus, Inc., a leading manufacturer of high-performance ultracapacitor technology headquartered in Oneonta, NY. The agreement supports Ioxus’ efforts to increase market awareness and market share of its latest products and innovative technology.

Ioxus manufactures iCAP® ultracapacitors, iMOD® modules, and THiNCAP® pouch cells and modules that are optimized for the highest energy and power density. Ioxus recently launched their leading edge 85º Titan™ ultracapacitor product line and the new industry changing line of 22 iMOD X-Series® ultracapacitor modules. The 22 X-Series modules allow customers to quickly integrate ultracaps into their application with little development cost or design lead time. Ioxus ultracapacitor cells and modules serve the automotive, hybrid bus, wind turbine pitch control, micro grid, UPS and industrial markets.

Richardson Electronics is a global channel partner for industry-leading electronic components and engineered solutions.

“Ioxus develops premium performance ultracapacitor technology and proves through extensive testing that their products achieve longer life than what is currently offered on the market,” said Greg Peloquin, Executive Vice President of Richardson Electronics’ Power & Microwave Technologies group. “Ioxus’ technology is extremely exciting for our sales team to promote to our customers, since these products offer key differentiators with distinct advantages.”

“With Richardson Electronics as a channel partner, Ioxus will leverage Richardson’s vast market reach to build market awareness of our latest products and leading technology to capture more design wins,” stated Jeff Colton, Vice President of Sales at Ioxus. “Their global presence and technical expertise will help us reach new customers and effectively take advantage of the opportunities in the rapidly expanding markets for ultracapacitor applications.”

About Richardson Electronics, Ltd.

Richardson Electronics, Ltd. is a leading global provider of engineered solutions, power grid and microwave tubes and related consumables; high value displays, flat panel detector solutions and replacement parts for diagnostic imaging equipment; and customized display solutions. We serve customers in the 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 online at www.rellpower.com.

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

About Ioxus, Inc.

Ioxus manufactures high performance ultracapacitor technology for transportation, alternative energy, medical, industrial and consumer product markets. The company offers the broadest range of cell styles in the industry, from 100 Farads to 3,000 Farads, with both iCAP® cylindrical and THiNCAP® pouch cell form factors. With our proprietary mixes and coating processes, Ioxus makes a superior electrode for ultracapacitors with higher power and energy density compared to other ultracapacitors. Ioxus designs and manufactures smaller, lighter weight iMOD® modules and the new 85°C Titan™ iMOD X-Series® family of module systems. Ioxus is headquartered in Oneonta, N.Y., with sales, service and quick-delivery inventory in Shanghai, China. More information is available online at www.ioxus.com.