 Vanguard Group Inc. reduced its position in Otter Tail Co. NASDAQ:OTTR by 1.5 during the 2nd quarter, according to its most recent filing with the SEC. The firm owned 4,023,427 shares of the utilities providers stock after selling 60,111 shares during the quarter. Vanguard Group Inc. owned about 0.10 of Otter Tail worth 156,069,000 as ... 