Ariel Investments (MAT) discloses 15.4M-share, 5.3% beneficial stake in Mattel

Rhea-AI Filing Summary

Ariel Investments, LLC reported beneficial ownership of Mattel Inc common stock on a Schedule 13G. Ariel beneficially owns 15,415,955 shares, representing 5.3% of Mattel’s common stock. Ariel has sole voting power over 14,351,708 shares and sole dispositive power over all 15,415,955 shares.

The filing states that Ariel’s adviser clients have the right to receive or direct the receipt of dividends and sale proceeds for the reported securities. However, none of Ariel’s individual clients has an economic interest in more than 5% of Mattel’s outstanding common stock.

Key Figures

Shares beneficially owned: 15,415,955 shares Percent of class: 5.3% Sole voting power: 14,351,708 shares +1 more

4 metrics

Shares beneficially owned 15,415,955 shares Mattel common stock beneficially owned by Ariel Investments, LLC

Percent of class 5.3% Percentage of Mattel common stock class owned by Ariel Investments, LLC

Sole voting power 14,351,708 shares Shares of Mattel over which Ariel has sole voting power

Sole dispositive power 15,415,955 shares Shares of Mattel over which Ariel has sole dispositive power

Key Terms

beneficially owned, sole voting power, sole dispositive power, Schedule 13G

4 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 15,415,955"

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 14,351,708.00"

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 15,415,955.00"

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

"all securities reported upon this Schedule."

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

What percentage of Mattel Inc (MAT) does Ariel Investments own?

Ariel Investments, LLC beneficially owns 5.3% of Mattel Inc’s common stock. This stake corresponds to 15,415,955 shares reported on a Schedule 13G as of the filing date.

How many Mattel (MAT) shares does Ariel Investments report on its Schedule 13G?

Ariel Investments reports beneficial ownership of 15,415,955 Mattel common shares. It holds sole voting power over 14,351,708 shares and sole dispositive power over all 15,415,955 shares.

What voting power does Ariel Investments have in Mattel Inc (MAT)?

Ariel Investments has sole voting power over 14,351,708 Mattel shares and no shared voting power. It also has sole dispositive power over 15,415,955 shares, giving it significant authority over that block.

Do Ariel Investments’ clients individually own over 5% of Mattel (MAT)?

According to the disclosure, none of Ariel Investments, LLC’s clients has an economic interest in more than 5% of Mattel’s common stock. Clients, however, are entitled to dividends and sale proceeds from the reported shares.

What type of filing did Ariel Investments make for Mattel (MAT)?

Ariel Investments filed a Schedule 13G reporting its beneficial ownership of Mattel common stock. Schedule 13G is a beneficial ownership report typically used by certain passive or institutional investors.

Who signed the Mattel (MAT) Schedule 13G on behalf of Ariel Investments?

The Schedule 13G was signed by James Prescott, Vice President, Compliance at Ariel Investments, LLC. The signature date listed is 08/14/2026, confirming the firm’s attestation of the ownership figures.

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

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Available on EDGAR 08/14/2026 - 09:59 AM Accepted by SEC EDGAR 08/14/2026 - 09:58 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Mattel Inc

(Name of Issuer)

Common Stock SH

(Title of Class of Securities)

577081102

(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): 577081102

1

Names of Reporting Persons

Ariel Investments, 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 14,351,708.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 15,415,955.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

15,415,955.00

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: Mattel Inc
(b)	Address of issuer's principal executive offices: 333 Continental Boulevard, El Segundo, US-CA, 90245, US
Item 2.
(a)	Name of person filing: Ariel Investments, LLC
(b)	Address or principal business office or, if none, residence: 200 E. Randolph Street, Suite 2900, Chicago, 60601, United States
(c)	Citizenship: DELAWARE
(d)	Title of class of securities: Common Stock SH
(e)	CUSIP Number(s): 577081102
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: 15,415,955
(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: 14,351,708
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 15,415,955
	(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.
	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. Ariel Investments, LLC's adviser clients have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, all securities reported upon this Schedule. None of Ariel Investments, LLC's clients have an economic interest in more than 5% of the subject securities reported upon this Schedule.
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.

Ariel Investments, LLC

Signature:	James Prescott
Name/Title:	Vice President, Compliance
Date:	08/14/2026