X0306 4 2021-05-31 0 0001580156 Houghton Mifflin Harcourt Co HMHC 0001733903 Desravines Jean S. C/O HOUGHTON MIFFLIN HARCOURT CO. 125 HIGH STREET BOSTON MA 02110 1 0 0 0 Common Stock 2021-05-31 4 M 0 55556 0.00 A 73721 D Restricted Stock Units 2021-05-31 4 M 0 55556 0.00 D Common Stock 55556 0 D Restricted Stock Units 2021-05-31 4 A 0 11066 0.00 A Common Stock 11066 11066 D Each restricted stock unit represents a contingent right to receive one share of Houghton Mifflin Harcourt Company's (the "Company") common stock. The restricted stock units vested on May 31, 2021 and were settled in exchange for a like amount of shares of the Company's common stock. This grant of restricted stock units will vest on May 31, 2022, subject to continued service on the Company's board of directors. William F. Bayers is the Executive Vice President, Secretary and General Counsel of the Company. /s/ William F. Bayers, Attorney-in-Fact 2021-06-02