 Alliancebernstein L.P. lifted its position in shares of Power Integrations Inc NASDAQ:POWI by 0.4 during the 1st quarter, HoldingsChannel reports. The fund owned 49,020 shares of the semiconductor companys stock after purchasing an additional 194 shares during the period. Alliancebernstein L.P.s holdings in Power Integrations were worth 4,330,000 at the end of the most recent ... 