Houghton Mifflin Upgraded By Goldman Sachs On Attractive Cash Flow By: Benzinga via Benzinga August 01, 2016 at 07:12 AM EDT While the Information Services group has outperformed over the past month, shares of Houghton Mifflin Harcourt Co (NASDAQ: HMHC) ... Read More >> Related Stocks: Houghton Mifflin Har