blue pool capital which manages part of the fortunes of alibaba group holding ltd cofounders joe tsai and jack ma took new equity positions in hudson pacific properties inc and airbnb inc last quarter while adding to its bets on microsoft corp and facebook inc the hong kongbased firm founded in 2004 disclosed in a regulatory filing it held 441 million of us stocks at the end of last year that’s an increase of 144 million from september  an almost 50 jump compared with a 12 gain in the sp 500 index last quarter