 Alliancebernstein L.P. boosted its stake in US Ecology Inc NASDAQ:ECOL by 6.7 during the 4th quarter, according to its most recent Form 13F filing with the Securities and Exchange Commission SEC. The firm owned 38,623 shares of the business services providers stock after buying an additional 2,415 shares during the period. Alliancebernstein L.P. owned 0.17 ... 