Sean Patrick Buckley - 08 Sep 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: 08 Sep 2025
Transactions value $: -$1,003,400
Form type: 4
Filing time: 10 Sep 2025, 17:00:08
Previous filing: 20 Aug 2025
Next filing: 18 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, 15TH FLOOR, NEW YORK	/s/ Aaron Saltz, attorney-in-fact	10 Sep 2025	0001865116

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MGNI	Common Stock	Sale	-$511K	-20K	-6.11%	$25.56	307K	08 Sep 2025	Direct	F1
transaction	MGNI	Common Stock	Sale	-$492K	-20K	-6.51%	$24.61	287K	09 Sep 2025	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.50 to $25.69, 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.
F2	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.51 to $25.07, 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.

Content

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.50 to $25.69, 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.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.51 to $25.07, 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.