HMH Holding Inc. Schedule 13G shows Citadel entities and Kenneth Griffin jointly report beneficial ownership of 665,923 shares (representing 6.3%) of Class A common stock. The filing notes 10,520,000 Shares outstanding as of April 2, 2026 and holdings are reported as of the opening of the market on April 9, 2026. The filing attributes 15 shares to Citadel Securities and reports Mr. Griffin as beneficially owning 665,938 shares (6.3%).
Positive
None.
Negative
None.
Insights
Citadel group reports a ~6.3% passive stake in HMH as of early April 2026.
The filing lists 665,923 shares held via Citadel Multi-Strategy Equities Master Fund Ltd., with the percentage calculated from 10,520,000 shares outstanding as of April 2, 2026. The statement is a standard beneficial-ownership disclosure under Schedule 13G and reflects shared voting and dispositive power rather than sole control.
Holder activity appears passive; subsequent filings could show changes if dispositions or acquisitions occur. Timing and exact instruments (if any convertible/exercisable securities are included) are described only as possible in the filing.
Filing follows joint reporting conventions and includes a power-of-attorney signature.
The joint filing names Citadel Advisors, CAH, CGP, Citadel Securities entities and Kenneth Griffin, and incorporates a power of attorney for signature. It clarifies shared voting/dispositive power of 665,923 shares for several Citadel entities and 665,938 shares for Mr. Griffin.
Disclosure aligns with Schedule 13G practice for passive/institutional investors; note the filing’s citation to an 8-K for the outstanding-share count and market-open dating for holdings.
Key Figures
Citadel holdings:665,923 sharesKenneth Griffin holdings:665,938 sharesCitadel Securities holdings:15 shares+1 more
4 metrics
Citadel holdings665,923 sharesreported as holdings by Citadel entities; market open April 9, 2026
Kenneth Griffin holdings665,938 sharesreported beneficial ownership; market open April 9, 2026
Citadel Securities holdings15 sharesreported separately for Citadel Securities
Shares outstanding used10,520,000 sharesused to calculate percentages as of April 2, 2026
A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.
beneficially ownregulatory
"Each of Citadel Advisors LLC ... may be deemed to beneficially own 665,923 Shares"
Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.
shared dispositive powerfinancial
"Shared Dispositive Power 665,923.00 reported for several entities"
joint filing agreementregulatory
"Exhibit 99.1 - Joint Filing Agreement"
power of attorneylegal
"Seth Levy is signing on behalf of Kenneth Griffin as attorney-in-fact"
A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
HMH Holding Inc.
(Name of Issuer)
Class A common stock, par value $0.01 per share (the "Shares")
(Title of Class of Securities)
40445M100
(CUSIP Number)
04/02/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
40445M100
1
Names of Reporting Persons
Citadel Advisors LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
665,923.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
665,923.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
665,923.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.3 %
12
Type of Reporting Person (See Instructions)
IA, HC, OO
Comment for Type of Reporting Person: The percentages reported in this Schedule 13G are based upon 10,520,000 Shares outstanding as of April 2, 2026 (according to the issuer's Form 8-K as filed with the Securities and Exchange Commission on April 2, 2026). Except as described in the preceding sentence, all Shares for the holdings of the reporting persons reported in this Schedule 13G are as of the opening of the market on April 9, 2026.
SCHEDULE 13G
CUSIP Number(s):
40445M100
1
Names of Reporting Persons
Citadel Advisors Holdings LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
665,923.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
665,923.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
665,923.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.3 %
12
Type of Reporting Person (See Instructions)
HC, PN
SCHEDULE 13G
CUSIP Number(s):
40445M100
1
Names of Reporting Persons
Citadel GP LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
665,923.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
665,923.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
665,923.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.3 %
12
Type of Reporting Person (See Instructions)
HC, OO
SCHEDULE 13G
CUSIP Number(s):
40445M100
1
Names of Reporting Persons
Citadel Securities LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
15.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
15.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
15.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
0.0 %
12
Type of Reporting Person (See Instructions)
BD, OO
SCHEDULE 13G
CUSIP Number(s):
40445M100
1
Names of Reporting Persons
Citadel Securities Group LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
15.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
15.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
15.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
0.0 %
12
Type of Reporting Person (See Instructions)
HC, PN
SCHEDULE 13G
CUSIP Number(s):
40445M100
1
Names of Reporting Persons
Citadel Securities GP LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
15.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
15.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
15.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
0.0 %
12
Type of Reporting Person (See Instructions)
HC, OO
SCHEDULE 13G
CUSIP Number(s):
40445M100
1
Names of Reporting Persons
Kenneth Griffin
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
665,938.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
665,938.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
665,938.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.3 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
HMH Holding Inc.
(b)
Address of issuer's principal executive offices:
3300 North Sam Houston Parkway East, Houston, TX 77032
Item 2.
(a)
Name of person filing:
This Schedule 13G is being jointly filed by Citadel Advisors LLC ("Citadel Advisors"), Citadel Advisors Holdings LP ("CAH"), Citadel GP LLC ("CGP"), Citadel Securities LLC ("Citadel Securities"), Citadel Securities Group LP ("CALC4"), Citadel Securities GP LLC ("CSGP") and Mr. Kenneth Griffin (collectively with Citadel Advisors, CAH, CGP, Citadel Securities, CALC4 and CSGP, the "Reporting Persons") with respect to the Shares of the above-named issuer owned by Citadel Multi-Strategy Equities Master Fund Ltd., a Cayman Islands company ("CM"), and Citadel Securities. Such owned Shares may include other instruments exercisable for or convertible into Shares.
Citadel Advisors is the portfolio manager for CM. CAH is the sole member of Citadel Advisors. CGP is the general partner of CAH. CALC4 is the non-member manager of Citadel Securities. CSGP is the general partner of CALC4. Mr. Griffin is the President and Chief Executive Officer of CGP, and owns a controlling interest in CGP and CSGP.
The filing of this statement shall not be construed as an admission that any of the Reporting Persons is the beneficial owner of any securities covered by the statement other than the securities actually owned by such person (if any).
(b)
Address or principal business office or, if none, residence:
The address of each of the Reporting Persons is 830 Brickell Plaza, Miami, Florida 33131.
(c)
Citizenship:
Each of Citadel Advisors, CGP, Citadel Securities and CSGP is organized as a limited liability company under the laws of the State of Delaware. Each of CALC4 and CAH is organized as a limited partnership under the laws of the State of Delaware. Mr. Griffin is a U.S. citizen.
(d)
Title of class of securities:
Class A common stock, par value $0.01 per share (the "Shares")
(e)
CUSIP Number(s):
40445M100
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own 665,923 Shares.
2. Citadel Securities LLC may be deemed to beneficially own 15 Shares.
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own 15 Shares.
4. Mr. Griffin may be deemed to beneficially own 665,938 Shares.
(b)
Percent of class:
1. The number of Shares that each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC may be deemed to beneficially own constitutes 6.3% of the Shares outstanding.
2. The number of Shares that Citadel Securities LLC may be deemed to beneficially own constitutes 0.0% of the Shares outstanding.
3. The number of Shares that each of Citadel Securities Group LP and Citadel Securities GP LLC may be deemed to beneficially own constitutes 0.0% of the Shares outstanding.
4. The number of Shares that Mr. Griffin may be deemed to beneficially own constitutes 6.3% of the Shares outstanding.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0
2. Citadel Securities LLC: 0
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0
4. Mr. Griffin: 0
(ii) Shared power to vote or to direct the vote:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 665,923
2. Citadel Securities LLC: 15
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 15
4. Mr. Griffin: 665,938
(iii) Sole power to dispose or to direct the disposition of:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 0
2. Citadel Securities LLC: 0
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 0
4. Mr. Griffin: 0
(iv) Shared power to dispose or to direct the disposition of:
1. Each of Citadel Advisors LLC, Citadel Advisors Holdings LP and Citadel GP LLC: 665,923
2. Citadel Securities LLC: 15
3. Each of Citadel Securities Group LP and Citadel Securities GP LLC: 15
4. Mr. Griffin: 665,938
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
Not Applicable
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
SIGNATURE
After reasonable 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.
Citadel Advisors LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/09/2026
Citadel Advisors Holdings LP
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/09/2026
Citadel GP LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/09/2026
Citadel Securities LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/09/2026
Citadel Securities Group LP
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/09/2026
Citadel Securities GP LLC
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, Authorized Signatory
Date:
04/09/2026
Kenneth Griffin
Signature:
/s/ Seth Levy
Name/Title:
Seth Levy, attorney-in-fact*
Date:
04/09/2026
Comments accompanying signature: * Seth Levy is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Advisors LLC on Schedule 13G for Allakos Inc. on October 13, 2023.
Citadel reports beneficial ownership of 665,923 shares, equal to 6.3% of Class A shares. The percentage is based on 10,520,000 Shares outstanding as of April 2, 2026 and holdings are reported as of the market open on April 9, 2026.
How many shares does Kenneth Griffin beneficially own in HMH?
Kenneth Griffin is reported as beneficially owning 665,938 shares, which the filing states represents 6.3% of the outstanding Class A shares. The filing dates holdings to the market open on April 9, 2026.
Does Citadel Securities hold HMH shares separately?
Yes. Citadel Securities is reported as beneficially owning 15 shares, shown separately from the 665,923-share position attributed to Citadel Advisors’ fund. The filing lists shared voting and dispositive power where applicable.
What is the effective outstanding share count used in the filing?
The filing cites 10,520,000 Shares outstanding as of April 2, 2026 for the percentage calculations. Holdings themselves are reported as of the opening of trading on April 9, 2026.
