FMR LLC discloses 5.1% MasterBrand Inc (MBC) ownership in Schedule 13G

Rhea-AI Filing Summary

FMR LLC filed a Schedule 13G reporting beneficial ownership of 10,370,825.43 shares of MASTERBRAND INC common stock, representing 5.1% of the class as of 06/30/2026. FMR LLC reports sole voting power over 10,326,133.34 shares and sole dispositive power over 10,370,825.43 shares, with no shared voting or dispositive power.

Abigail P. Johnson is also reported as having sole dispositive power over the same 10,370,825.43 shares, with no voting power. One or more other persons have rights to dividends or sale proceeds in these shares, but no such person holds more than five percent of MASTERBRAND INC’s outstanding common stock.

Key Figures

Beneficial ownership: 10,370,825.43 shares Percent of class: 5.1% Sole voting power: 10,326,133.34 shares +2 more

5 metrics

Beneficial ownership 10,370,825.43 shares Common stock of MASTERBRAND INC beneficially owned by FMR LLC

Percent of class 5.1% Portion of MASTERBRAND INC common stock class held by FMR LLC

Sole voting power 10,326,133.34 shares Shares of MASTERBRAND INC over which FMR LLC has sole voting power

Sole dispositive power (FMR LLC) 10,370,825.43 shares Shares of MASTERBRAND INC over which FMR LLC can direct disposition

Sole dispositive power (Abigail P. Johnson) 10,370,825.43 shares Shares of MASTERBRAND INC over which Abigail P. Johnson has sole dispositive power

Key Terms

beneficially owned, Sole Voting Power, Sole Dispositive Power, Schedule 13G, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 10370825.43"

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

"5 | Sole Voting Power 10,326,133.34 6 | Shared Voting Power 0.00"

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.

Sole Dispositive Power financial

"7 | Sole Dispositive Power 10,370,825.43 8 | Shared Dispositive Power 0.00"

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.

Schedule 13G regulatory

"Please see Exhibit 99 for 13d-1(k) (1) agreement."

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.

parent holding company financial

"Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company"

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

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FAQ

What percentage of MASTERBRAND INC (MBC) shares does FMR LLC report owning?

FMR LLC reports beneficial ownership of 5.1% of MASTERBRAND INC’s common stock. This stake corresponds to 10,370,825.43 shares as of June 30, 2026, giving FMR a meaningful but minority position in the company.

How many MASTERBRAND INC (MBC) shares does FMR LLC have voting power over?

FMR LLC reports sole voting power over 10,326,133.34 shares of MASTERBRAND INC common stock. It reports no shared voting power, indicating voting authority is concentrated solely within FMR for these shares.

What dispositive powers over MASTERBRAND INC (MBC) shares are reported by FMR LLC?

FMR LLC reports sole dispositive power over 10,370,825.43 shares of MASTERBRAND INC common stock and no shared dispositive power. Dispositive power refers to the authority to sell or otherwise dispose of the shares.

What is Abigail P. Johnson’s reported interest in MASTERBRAND INC (MBC)?

Abigail P. Johnson is reported with sole dispositive power over 10,370,825.43 shares of MASTERBRAND INC and no voting power. This reflects her control over the disposition of these shares but not their voting rights.

Do other investors share in the economic interest of MASTERBRAND INC (MBC) shares held by FMR LLC?

Yes. The filing states that one or more other persons have rights to dividends or sale proceeds from MASTERBRAND INC shares. However, no such person’s interest exceeds five percent of the company’s outstanding common stock.

Why was a Schedule 13G filed for MASTERBRAND INC (MBC)?

A Schedule 13G was filed because FMR LLC’s beneficial ownership reached 5.1% of MASTERBRAND INC’s common stock. Crossing the five percent threshold requires institutional investors to report their holdings and voting and dispositive powers.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

MASTERBRAND INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

57638P104

(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): 57638P104

1

Names of Reporting Persons

FMR 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 10,326,133.34
6	Shared Voting Power 0.00
7	Sole Dispositive Power 10,370,825.43
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

10,370,825.43

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)

5.1 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 57638P104

1

Names of Reporting Persons

Abigail P. Johnson

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 0.00
7	Sole Dispositive Power 10,370,825.43
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

10,370,825.43

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)

5.1 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MASTERBRAND INC
(b)	Address of issuer's principal executive offices: 3300 ENTERPRISE PARKWAY,SUITE 300,BEACHWOOD,OH,US,44122
Item 2.
(a)	Name of person filing: FMR LLC
(b)	Address or principal business office or, if none, residence: 245 Summer Street, Boston, Massachusetts 02210
(c)	Citizenship: Not applicable
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP Number(s): 57638P104
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: 10370825.43
(b)	Percent of class: 5.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Please see the responses to Items 5 and 6 on the cover page.
	(ii) Shared power to vote or to direct the vote: 0.00
	(iii) Sole power to dispose or to direct the disposition of: 10370825.43
	(iv) Shared power to dispose or to direct the disposition of: 0.00
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.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. One or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the COMMON STOCK of MASTERBRAND INC. No one other person's interest in the COMMON STOCK of MASTERBRAND INC is more than five percent of the total outstanding COMMON STOCK.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See attached Exhibit 99.
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.

FMR LLC

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 3, 2023, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Date:	08/05/2026

Abigail P. Johnson

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 26, 2023, by and on behalf of Abigail P. Johnson**
Date:	08/05/2026

Comments accompanying signature: * This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 10, 2023, accession number: 0000315066-23-000003. ** This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 31, 2023, accession number: 0000315066-23-000038.

Exhibit Information

Please see Exhibit 99 for 13d-1(k) (1) agreement.