 Alliancebernstein L.P. trimmed its position in Atrion Co. NASDAQ:ATRI by 19.1 during the fourth quarter, according to the company in its most recent 13F filing with the Securities and Exchange Commission SEC. The fund owned 3,427 shares of the medical instruments suppliers stock after selling 810 shares during the period. Alliancebernstein L.P.s holdings in Atrion ... 