Live feed07:00:00·1784dPRReleasevia QuantisnowHoughton Mifflin Harcourt Announces Strong Second Quarter 2021 Results; Delivers Billings Growth of 25%; Raises Full Year GuidanceByQuantisnow·Wall Street's wire, on your screen.HMHC· Houghton Mifflin Harcourt CompanyMiscellaneous