Houghton Mifflin Harcourt to Host Investor Day on June 23, 2017

BOSTON – Global learning company Houghton Mifflin Harcourt (“HMH” or the “Company”) (NASDAQ: HMHC) today announced that it will host an Investor Day on Friday, June 23, 2017 in New York City. The meeting is scheduled to begin at 9 a.m. ET.

At the event, HMH’s management team will highlight the Company’s unique Education assets and capabilities, and provide additional insight on how to better understand the drivers of the business through the cycle. Investors and analysts will also have an opportunity to view HMH’s digital showcase featuring the Company’s latest innovative products.

Professional investors and financial analysts interested in attending the event should email hmhevents@hmhco.com. Advance registration is required.

The event will be webcast live and accompanying slides will be available at ir.hmhco.com at the start of the meeting. A replay of the event will be archived and available on the Company’s website following the event.

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About Houghton Mifflin Harcourt

Houghton Mifflin Harcourt (NASDAQ:HMHC) is a global learning company dedicated to changing people’s lives by fostering passionate, curious learners. As a leading provider of pre-K–12 education content, services, and cutting-edge technology solutions across a variety of media, HMH enables learning in a changing landscape. HMH is uniquely positioned to create engaging and effective educational content and experiences from early childhood to beyond the classroom. HMH serves more than 50 million students in over 150 countries worldwide, while its award-winning children’s books, novels, non-fiction, and reference titles are enjoyed by readers throughout the world. For more information, visit www.hmhco.com.

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Contact Information:

Investor Relations Brian S. Shipman, CFA Senior Vice President, Investor Relations (212) 592-1177 brian.shipman@hmhco.com

Media Relations Leah Riviere Senior Communications Manager, Corporate Affairs (617) 351-5020 leah.riviere@hmhco.com