Magnite (MGNI): Vanguard Reports 14,654,432 Shares (10.29%)

The Vanguard Group filed an amended Schedule 13G reporting ownership of 14,654,432 shares of Magnite Inc. common stock, equal to 10.29% of the class.

Rhea-AI Filing Summary

The Vanguard Group filed an amended Schedule 13G reporting ownership of 14,654,432 shares of Magnite Inc. common stock, equal to 10.29% of the class. Vanguard reports 0 shares of sole voting power and 972,050 shares of shared voting power, with 13,506,122 shares of sole dispositive power and 1,148,310 shares of shared dispositive power. The filing states these securities are held in the ordinary course of business and not for the purpose of changing or influencing control.

Positive

• Large, passive stake of 14,654,432 shares (10.29%), indicating institutional confidence
• Declared ordinary-course holding on a Schedule 13G, suggesting no immediate control intent

Negative

• None.

Insights

Institutional Ownership Analyst

Vanguard holds a meaningful passive stake of 10.29% in Magnite.

Holding 14,654,432 shares at 10.29% makes Vanguard a significant institutional owner but the filing is a Schedule 13G, which signals a non‑activist, passive position rather than an intent to influence control.

Key dependencies include client mandates and managed account flows that determine disposition power; monitor any subsequent Schedule 13D or Form 4 filings for changes in voting intent or trading that could alter this passive classification within a near‑term horizon.

FAQ

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

What stake does Vanguard report in Magnite (MGNI)?

Vanguard reports beneficial ownership of 14,654,432 shares, representing 10.29% of Magnite common stock.

Does Vanguard claim voting control over MGNI shares?

Vanguard reports 0 shares of sole voting power and 972,050 shares of shared voting power.

How much dispositive power does Vanguard have over MGNI shares?

Vanguard reports 13,506,122 shares of sole dispositive power and 1,148,310 shares of shared dispositive power.

Is Vanguard seeking to influence Magnite's control according to the filing?

No. The filing certifies the securities are held in the ordinary course of business and not for changing or influencing control.

What filing type did Vanguard submit for MGNI and when was it signed?

Vanguard submitted an amended Schedule 13G and the signature date on the filing is 10/06/2025.

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

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Accepted by SEC EDGAR 10/06/2025 - 05:18 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

Magnite Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

55955D100

(CUSIP Number)

09/30/2025

(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)

SCHEDULE 13G

CUSIP No. 55955D100

1

Names of Reporting Persons

The Vanguard 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

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 972,050.00
7	Sole Dispositive Power 13,506,122.00
8	Shared Dispositive Power 1,148,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

14,654,432.00

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)

10.29 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Magnite Inc
(b)	Address of issuer's principal executive offices: 1250 Broadway, 15th Floor, New York, NY, 10001
Item 2.
(a)	Name of person filing: The Vanguard Group
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd., Malvern, PA 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 55955D100
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: 14654432
(b)	Percent of class: 10.29 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 972050
	(iii) Sole power to dispose or to direct the disposition of: 13506122
	(iv) Shared power to dispose or to direct the disposition of: 1148310
Item 5.	Ownership of 5 Percent or Less of a Class.
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. The Vanguard Group, Inc.'s clients, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein. No one other person's interest in the securities reported herein is more than 5%.
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.

The Vanguard Group

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	10/06/2025