 Two Sigma Advisers LP lifted its position in Houghton Mifflin Harcourt Co NASDAQ:HMHC by 73.7 during the 1st quarter, HoldingsChannel reports. The firm owned 39,600 shares of the business services providers stock after acquiring an additional 16,800 shares during the quarter. Two Sigma Advisers LPs holdings in Houghton Mifflin Harcourt were worth 74,000 at the ... 