Water Island Capital boosted its position in Kythera Biopharmaceuticals Inc (NASDAQ:KYTH) by 7.6% during the third quarter, according to its most recent filing with the Securities and Exchange Commission. The institutional investor owned 897,702 shares of the biopharmaceutical company's stock after buying an additional 63,318 shares during the period. Kythera Biopharmaceuticals accounts for 3.4% of [...]