 Alliancebernstein L.P. lifted its stake in shares of Casa Systems Inc NASDAQ:CASA by 40.9 in the first quarter, according to its most recent Form 13F filing with the Securities and Exchange Commission. The institutional investor owned 4,837,539 shares of the companys stock after buying an additional 1,404,069 shares during the quarter. Alliancebernstein L.P. owned approximately ... 