MGNI insider sells 19,233 shares for $365K

MGNI insider sale reported: Sean Buckley reported the sale of 19,233 shares of common stock under a 10b5-1 plan on 06/17/2026, generating $365,427 in proceeds.

Rhea-AI Filing Summary

MGNI insider sale reported: Sean Buckley reported the sale of 19,233 shares of common stock under a 10b5-1 plan on 06/17/2026, generating $365,427 in proceeds. The filing also lists 12,482 Restricted Stock Units (08/15/2023) and 6,751 Performance Stock Awards (01/01/2026).

Insights

Securities Compliance Analyst

Routine 10b5-1 sale by an executive; procedural disclosure.

This Form 144 records a 10b5-1 selling-plan transaction of 19,233 shares on 06/17/2026, with aggregate proceeds of $365,427. The filing lists related equity awards (RSUs and Performance Stock Awards) with their grant dates.

Because the sale was executed under a prearranged 10b5-1 plan, the action is procedural; subsequent filings would show any further plan activity.

Key Figures

Shares sold: 19,233 shares Aggregate proceeds: $365,427 Restricted Stock Units: 12,482 units +1 more

4 metrics

Shares sold 19,233 shares sale on 06/17/2026 under 10b5-1

Aggregate proceeds $365,427 proceeds from 06/17/2026 sale

Restricted Stock Units 12,482 units grant date 08/15/2023

Performance Stock Awards 6,751 awards grant date 01/01/2026

Key Terms

10b5-1, Restricted Stock Units, Performance Stock Awards

3 terms

10b5-1 regulatory

"10b5-1 Sales for SEAN BUCKLEY 1250 Broadway"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Restricted Stock Units financial

"Restricted Stock Units | Issuer | 12,482 | 08/15/2023"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Performance Stock Awards financial

"Performance Stock Awards | Issuer | 6,751 | 01/01/2026"

FAQ

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

What did MGNI insider Sean Buckley report in Form 144?

Sean Buckley reported the sale of 19,233 shares of common stock under a 10b5-1 plan on 06/17/2026, with aggregate proceeds of $365,427. The filing also lists RSUs and Performance Stock Awards with grant dates.

How many Restricted Stock Units and Performance Stock Awards are listed in the MGNI filing?

The filing lists 12,482 Restricted Stock Units granted on 08/15/2023 and 6,751 Performance Stock Awards granted on 01/01/2026. These award counts are presented as securities information in the notice.

Was the sale by Sean Buckley executed under a trading plan?

Yes, the sale is identified as a 10b5-1 sales transaction on 06/17/2026, indicating it was executed under a prearranged trading plan. The filing records the transaction as a covered sale under that plan.

How much did Sean Buckley receive from the reported sale?

The aggregate proceeds disclosed for the reported sale are $365,427 tied to the disposition of 19,233 shares on 06/17/2026. The filing pairs the share count with this aggregate dollar amount.

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

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Accepted by SEC EDGAR 07/07/2026 - 04:36 PM Learn about SEC filing dates

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	0001865116
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MAGNITE, INC.
SEC File Number	001-36384
Address of Issuer	1250 Broadway, 9th Floor New York NEW YORK 10001
Phone	2122432769
Name of Person for Whose Account the Securities are To Be Sold	SEAN BUCKLEY
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	Officer

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	19233	400815.72	143215003	07/07/2026	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	08/15/2023	Restricted Stock Units	Issuer			12482	08/15/2023	N/A
Common	01/01/2026	Performance Stock Awards	Issuer			6751	01/01/2026	N/A

* 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
10b5-1 Sales for SEAN BUCKLEY 1250 Broadway, 9th Floor New York NY 10001	Common	06/17/2026	19233	365427.00

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 08/15/2023 through 05/15/2026.
Date of Notice	07/07/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/10/2025
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	/s/ Sean Buckley
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)