Sean Patrick Buckley - 15 Nov 2025 Form 4 Insider Report for MAGNITE, INC. (MGNI)

Role
President, Revenue
Signature
/s/ Aaron Saltz, attorney-in-fact
Issuer symbol
MGNI
Transactions as of
15 Nov 2025
Net transactions value
-$223,866
Form type
4
Filing time
18 Nov 2025, 19:41:08 UTC
Previous filing
10 Sep 2025
Next filing
26 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Buckley Sean Patrick President, Revenue C/O MAGNITE, INC., 1250 BROADWAY, 9TH FLOOR, NEW YORK /s/ Aaron Saltz, attorney-in-fact 18 Nov 2025 0001865116

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MGNI Common Stock Tax liability $164,734 -11,642 -4.1% $14.15 275,551 15 Nov 2025 Direct F1
transaction MGNI Common Stock Sale $59,131 -4,426 -1.6% $13.36 271,125 18 Nov 2025 Direct F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 Represents the non-discretionary forfeiture of shares on behalf of the Reporting Person pursuant to an arrangement mandated by the Issuer to cover the tax withholding obligations associated with the vesting of restricted stock units.
F2 The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 24, 2023.
F3 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.14 to $13.50, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4.