HMHC Houghton Mifflin Harcourt Company

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE TO

Tender Offer Statement under Section 14(d)(1) or 13(e)(1)

of the Securities Exchange Act of 1934

(Amendment No. 3)

HOUGHTON MIFFLIN HARCOURT COMPANY

(Name of Subject Company (Issuer))

HARBOR PURCHASER INC.

(Name of Filing Persons (Offeror))

a wholly owned subsidiary of

HARBOR HOLDING CORP.

(Name of Filing Persons (Parent of Offeror))

Common Stock, par value $0.01 per share

(Title of Class of Securities)

44157R109

(CUSIP Number of Class of Securities)

Daniel Sugar

Veritas Capital Fund Management, L.L.C.

9 West 57th Street, 32nd Floor

New York, New York 10019

(212) 415-6700

(Name, address, and telephone numbers of person authorized to receive notices and communications on behalf of filing persons)

With copies to:

Richard A. Presutti

Milbank LLP

55 Hudson Yards

New York, NY 10001

(212) 530-5001

Check the appropriate boxes below to designate any transactions to which the statement relates:

Check the following box if the filing is a final amendment reporting the results of the tender offer:  ☐

If applicable, check the appropriate box(es) below to designate the appropriate rule provision(s) relied upon:

This Amendment No. 3 (this “Amendment”) amends and supplements the Tender Offer Statement on Schedule TO filed with the U.S. Securities and Exchange Commission on March 7, 2022 (together with any amendments and supplements hereto, this “Schedule TO”) by Harbor Purchaser Inc., a Delaware corporation (the “Offeror”) and a wholly owned subsidiary of Harbor Holding Corp., a Delaware corporation (“Parent”), which is an indirect, wholly owned subsidiary of The Veritas Capital Fund VII, L.P., a Delaware limited partnership (the “Sponsor”). This Schedule TO relates to the offer by the Offeror to purchase all of the issued and outstanding Company Shares at a purchase price of $21.00 per share (the “Offer Price”), net to the holder thereof in cash, net of applicable withholding taxes and without interest, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated March 7, 2022 (the “Offer to Purchase”), and in the related Letter of Transmittal (the “Letter of Transmittal”), which, together with the Offer to Purchase, as each may be amended or supplemented from time to time in accordance with the Merger Agreement described below, collectively constitute the “Offer”), copies of which are annexed to and filed with the Schedule TO as Exhibits (a)(1)(A) and (a)(1)(B), respectively. All the information set forth in the Offer to Purchase is incorporated herein by reference in response to all of the applicable items in the Schedule TO and is supplemented by the information specifically provided in the Schedule TO, except that such information is amended and supplemented to the extent specifically provided in this Amendment. The Agreement and Plan of Merger, dated as of February 21, 2022 (as amended by Amendment No. 1, entered into on March 21, 2022, a copy of which is attached as Exhibit (d)(5) to the Schedule TO), by and among Parent, the Offeror and Houghton Mifflin Harcourt Company, a Delaware corporation (“HMH”), a copy of which is attached as Exhibit (d)(1) thereto, is incorporated herein by reference with respect to Items 4 through 11 of the Schedule TO. Unless otherwise indicated, references to sections in this Amendment are references to sections of the Offer to Purchase. Capitalized terms used and not otherwise defined in this Amendment shall have the meanings assigned to such terms in the Offer to Purchase or in the Schedule TO. This Amendment is being filed to amend and supplement Items 1 through 9 and Item 11 of the Schedule TO as reflected below.

ITEMS 1 THROUGH 9 AND ITEM 11.

The Offer to Purchase and Items 1 through 9 and 11 of the Schedule TO, to the extent such Items incorporate by reference the information contained in the Offer to Purchase, are hereby amended and supplemented by adding the following text thereto:

“On March 29, 2022, Purchaser extended the expiration of the Offer. The Offer was previously scheduled to expire at one minute after 11:59 p.m., New York City time, on April 1, 2022. The expiration date of the Offer has been extended until one minute after 11:59 p.m., New York City time, on April 6, 2022, unless further extended. Computershare Trust Company, N.A., the depositary for the Offer, has indicated that as of one minute after 11:59 p.m., New York City time, March 28, 2022, approximately 1,803,547 Company Shares had been validly tendered into and not validly withdrawn from the Offer, representing 0.6% of the outstanding Company Shares.

On March 29, 2022,Veritas Capital issued a press release announcing the extension of the Offer. The full text of the press release is attached as Exhibit (a)(5)(B) to the Schedule TO and is incorporated herein by reference.”

AMENDMENTS TO THE OFFER TO PURCHASE AND EXHIBITS TO THE SCHEDULE TO.

All references to “one minute after 11:59 p.m., New York City time, on April 1, 2022” set forth in the Offer to Purchase (Exhibit (a)(1)(A)), Letter of Transmittal (Exhibit (a)(1)(B)), Notice of Guaranteed Delivery (Exhibit (a)(1)(C)), Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees (Exhibit (a)(1)(D)), and Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees (Exhibit (a)(1)(E)) are hereby amended and replaced with “one minute after 11:59 p.m., New York City time, on April 6, 2022.”

ITEM 12. EXHIBITS.

Item 12 of this Schedule TO is hereby amended by adding the following exhibits:

SIGNATURES

After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

HARBOR PURCHASER INC.

HARBOR HOLDING CORP.

Dated: March 29, 2022