X0303 4 2008-12-31 0000833640 POWER INTEGRATIONS INC POWI 0001389039 Bailey Doug 5245 HELLYER AVE SAN JOSE CA 95138 0 1 0 0 VP Marketing Stock Option (right to buy Common Stock) 31.15 2008-12-31 4 D 0 25000 4.00 D 2008-10-29 2018-04-29 Common Stock 25000 0 D The options were tendered in exchange for payment of $4.00 per underlying share of Common Stock pursuant to an issuer tender offer described in the Tender Offer Statement on Schedule TO filed with the Commission on December 3, 2008, as amended on December 8, 2008, December 23, 2008 and January 5, 2009 (the "Tender Offer"). /s/ Doug Bailey 2009-01-05