[144] Magnite, Inc. SEC Filing

Rhea-AI Filing Summary

Magnite, Inc. (MGNI) filed a Form 144 indicating a planned sale of 9,289 common shares worth approximately $204,358 at prevailing market prices. The shares were originally acquired on 02/15/2024 as restricted stock directly from the issuer and will be executed through Morgan Stanley Smith Barney LLC on or about 06/30/2025. Total shares outstanding are reported at 141,110,559, so the proposed sale represents less than 0.01 % of the float.

The filing lists David Buonasera as the selling shareholder, who has already disposed of 12,395 shares over the past three months for gross proceeds of $194,776.59. While the dollar amounts are modest relative to Magnite’s market capitalization, consecutive insider sales can raise sentiment concerns for some investors. The form contains no operational or financial performance data and makes no assertions about Magnite’s fundamentals; it solely discloses the insider’s intent to sell under Rule 144.

Positive

• None.

Negative

• Insider continues to sell shares, potentially signaling reduced personal confidence although amounts are immaterial.

Insights

Corporate Governance Expert

TL;DR: Small, routine Rule 144 sale; sentiment slightly negative but immaterial financially.

The transaction involves 9,289 shares, following two earlier sales in May totaling 12,395 shares. Cumulatively, the insider will have sold about 21,684 shares—still an insignificant fraction of Magnite’s ~141 million shares outstanding. Because no additional context (e.g., option expirations, tax obligations) is provided, investors may view the pattern as mild bearish sentiment from the insider. However, the dollar value is too small to affect liquidity or ownership structure. I classify the filing as not impactful for valuation, but worth noting in governance tracking.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	9289	204358.00	141110559	06/30/2025	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/15/2024	Restricted Stock	Issuer			9289	02/15/2024	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
DAVID BUONASERA 1250 Broadway, 15th Floor New York NY 10001	Common	05/27/2025	8742	139872.00
DAVID BUONASERA 1250 Broadway, 15th Floor New York NY 10001	Common	05/23/2025	3653	54904.59

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What is Magnite (MGNI) disclosing in this Form 144?

The company reports an insider’s plan to sell 9,289 common shares worth about $204k on or after 06/30/2025.

Who is selling the shares according to the filing?

David Buonasera is listed as the selling shareholder under Rule 144.

How many Magnite shares has the insider sold recently?

The insider sold 12,395 shares in May 2025 and now plans to sell an additional 9,289 shares.

What percentage of Magnite’s outstanding shares does the planned sale represent?

Less than 0.01 % of the 141,110,559 shares outstanding.

Does the filing include any financial performance data?

No, Form 144 only details the intended sale; it contains no earnings or operational metrics.