Sec Form 4 Filing - Skogerbo Pal @ HMH Holding Inc - 2026-05-05

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Skogerbo Pal 2. Issuer Name and Ticker or Trading Symbol HMH Holding Inc [ HMH] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Technology Officer (Last) (First) (Middle) 3300 NORTH SAM HOUSTON PARKWAY EAST 3. Date of Earliest Transaction (MM/DD/YY) 05/05/2026 (Street) HOUSTON, TX77032 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 05/05/2026 A 12,468 ( 1 ) ( 2 ) A $ 0 73,744 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Skogerbo Pal 3300 NORTH SAM HOUSTON PARKWAY EAST HOUSTON, TX77032 Chief Technology Officer Signatures /s/ Dwight W. Rettig, attorney-in-fact 05/07/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents restricted stock units granted to the reporting person under the HMH Holding Inc. 2026 Long-Term Incentive Plan on May 5, 2026. Each restricted stock unit represents a contingent right to receive one share of Class A common stock, par value $0.01 per share, of HMH Holding Inc. (the "Issuer"). Due to an administrative error in the calculation of equity awards granted on April 2, 2026, fewer restricted stock units were granted to the reporting person than were approved by the Board of Directors of the Issuer to be granted on that date. This grant represents a true-up award to align the number of restricted stock units granted with the amounts originally approved. ( 2 )(Continued from footnote 1) The restricted stock units include 9,659 restricted stock units that vested immediately upon grant, 624 restricted stock units that vest on September 1, 2026, 874 restricted stock units that vest in two equal annual installments on September 1, 2026 and September 1, 2027 and 1,311 restricted stock units that vest in three equal annual installments on September 1, 2026, September 1, 2027 and September 1, 2028.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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