Power Integrations Set to Join Russell 3000 Index

Annual Index Reconstitution Scheduled to Take Effect On June 27


SAN JOSE, Calif., June 17, 2008 (PRIME NEWSWIRE) -- Power Integrations (Nasdaq:POWI), the leader in high-voltage integrated circuits for energy-efficient power conversion, is set to join the broad-market Russell 3000(r) Index when Russell Investments reconstitutes its comprehensive set of U.S. and global equity indexes on June 27, according to a preliminary list of additions posted Friday on www.russell.com.

Annual reconstitution of Russell's U.S. indexes captures the 4,000 largest U.S. stocks as of the end of May, ranking them by total market capitalization. As a result of its membership in the Russell 3000, Power Integrations will also be included in the small-cap Russell 2000(r) Index as well as the appropriate growth and value style indexes. Russell determines membership for its equity indexes primarily by objective, market-capitalization rankings and style attributes.

The Russell 3000 also serves as the U.S. component of the Russell Global Index, which Russell launched last year.

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. An industry-leading $4.4 trillion in assets currently are benchmarked to them.

About Power Integrations

Power Integrations is the leading supplier of high-voltage analog integrated circuits used in power conversion. The company's breakthrough integrated-circuit technology enables compact, energy-efficient power supplies in a wide range of electronic products, in both AC-DC and DC-DC applications. The company's EcoSmart(r) energy-efficiency technology, which dramatically reduces energy waste, has saved consumers and businesses around the world more than an estimated $2.9 billion on their electricity bills since its introduction in 1998. For more information, visit the company's website at www.powerint.com.



            

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