Third Point takes 1.6 mln share stake in BlackRock, 4.5 mln in Alibaba

NEW YORK, Aug 11 (Reuters) - Dan Loeb's Third Point took a 1.6 million-share stake in BlackRock Inc and reinitiated a stake in Alibaba Group Holding of 4.5 million shares during the second quarter ended June 30, according to regulatory filings late on Friday.