 Alliancebernstein L.P. grew its holdings in PDF Solutions, Inc. NASDAQ:PDFS by 29.7 in the first quarter, HoldingsChannel.com reports. The institutional investor owned 35,898 shares of the technology companys stock after buying an additional 8,228 shares during the quarter. Alliancebernstein L.P.s holdings in PDF Solutions were worth 421,000 at the end of the most recent reporting ... 