 Skandinaviska Enskilda Banken AB publ lessened its position in Arena Pharmaceuticals, Inc. NASDAQ:ARNA by 19.8 during the 1st quarter, according to the company in its most recent Form 13F filing with the SEC. The institutional investor owned 40,200 shares of the biopharmaceutical companys stock after selling 9,900 shares during the period. Skandinaviska Enskilda Banken AB ... 