Schroder discloses 5.3% stake in HMH Holding

Schroder Investment Management Group, through Schroder Investment Management North America Inc., reports beneficial ownership of Class A shares of HMH Holding Inc. The group reports holding 609,527 Class A shares, representing 5.3% of this class.

Rhea-AI Filing Summary

Schroder Investment Management Group, through Schroder Investment Management North America Inc., reports beneficial ownership of Class A shares of HMH Holding Inc. The group reports holding 609,527 Class A shares, representing 5.3% of this class. Schroder reports sole power to vote and sole power to dispose of all 609,527 shares, with no shared voting or dispositive power. The shares are held on a beneficial basis, and the filing is executed on behalf of the advisers by Thomas Darnowski, CEO, Americas, under a power of attorney.

Key Figures

Beneficially owned shares: 609,527 shares Percent of class: 5.3% Sole voting power: 609,527 shares +3 more

6 metrics

Beneficially owned shares 609,527 shares Class A common stock beneficially owned by Schroder Investment Management Group

Percent of class 5.3% Percentage of HMH Holding Inc Class A shares reported as beneficially owned

Sole voting power 609,527 shares Shares over which Schroder reports sole power to vote or direct the vote

Shared voting power 0 shares Shares over which Schroder reports shared power to vote

Sole dispositive power 609,527 shares Shares over which Schroder reports sole power to dispose or direct disposition

Shared dispositive power 0 shares Shares over which Schroder reports shared dispositive power

Key Terms

beneficially owned, sole voting power, shared voting power, sole dispositive power, +2 more

6 terms

beneficially owned financial

"Amount beneficially owned: 609,527"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Sole Voting Power 609,527.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

shared voting power financial

"Shared Voting Power 0.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

sole dispositive power financial

"Sole Dispositive Power 609,527.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

shared dispositive power financial

"Shared Dispositive Power 0.00"

Schedule 13G regulatory

"form_type: SCHEDULE 13G"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What percentage of HMH (HMH) Class A shares does Schroder Investment Management Group report owning?

Schroder Investment Management Group reports beneficial ownership of 5.3% of HMH Holding Inc’s Class A shares. This corresponds to a reported holding of 609,527 shares with sole voting and dispositive power over the entire position.

How many HMH (HMH) Class A shares does Schroder Investment Management Group beneficially own?

Schroder Investment Management Group reports beneficial ownership of 609,527 HMH Holding Inc Class A shares. The group states it has sole voting and sole dispositive power over all 609,527 shares, with no shared authority reported.

Does Schroder Investment Management Group have sole or shared voting power over its HMH (HMH) stake?

Schroder Investment Management Group reports sole voting power over 609,527 HMH Holding Inc Class A shares. It reports zero shared voting power, indicating all reported voting authority is held on a sole basis.

Who signed the Schedule 13G related to HMH (HMH) for Schroder Investment Management Group?

The Schedule 13G is signed by Thomas Darnowski, CEO, Americas. The signature is noted as being provided under a power of attorney authorizing him to sign on behalf of the listed Schroder advisers.

Which Schroder entity in the U.S. is associated with the HMH (HMH) Schedule 13G filing?

The filing identifies Schroder Investment Management North America Inc. as a reporting entity. It reports beneficial ownership of 609,527 HMH Holding Inc Class A shares, equal to 5.3% of that class, with sole voting and dispositive power.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/12/2026 - 11:24 AM Accepted by SEC EDGAR 08/12/2026 - 11:23 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

HMH Holding Inc

(Name of Issuer)

CL A

(Title of Class of Securities)

40445M100

(CUSIP Number)

06/30/2026

(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

SCHRODER INVESTMENT MANAGEMENT GROUP

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 KINGDOM

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 609,527.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 609,527.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

609,527.00

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)

5.3 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 40445M100

1

Names of Reporting Persons

Schroder Investment Management North America Inc.

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 609,527.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 609,527.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

609,527.00

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)

5.3 %

12

Type of Reporting Person (See Instructions)

IA

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, Texas 77032 United States
Item 2.
(a)	Name of person filing: Schroder Investment Management Group
(b)	Address or principal business office or, if none, residence: London Wall Place, London, EC2Y 5AU, GB, United
(c)	Citizenship: United Kingdom,
(d)	Title of class of securities: CL A
(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: 609,527
(b)	Percent of class: 5.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 609,527
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 609,527
	(iv) Shared power to dispose or to direct the disposition of: 0
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 acquired and are held in the ordinary course of business and 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.

SCHRODER INVESTMENT MANAGEMENT GROUP

Signature:	/s/ Thomas Darnowski
Name/Title:	Thomas Darnowski, CEO, Americas
Date:	08/11/2026

Schroder Investment Management North America Inc.

Signature:	/s/ Thomas Darnowski
Name/Title:	Thomas Darnowski, CEO, Americas
Date:	08/11/2026

Comments accompanying signature: **Authorized by Power of Attorney to sign on behalf of the below Advisers: Schroder Investment Management Group