 Alliancebernstein L.P. trimmed its stake in Par Pacific Holdings, Inc. NYSEAMERICAN:PARR by 57.2 in the first quarter, Holdings Channel.com reports. The firm owned 56,700 shares of the oil and gas companys stock after selling 75,857 shares during the quarter. Alliancebernstein L.P.s holdings in Par Pacific were worth 403,000 as of its most recent SEC filing. ... 