UNITED STATES 

SECURITIES AND EXCHANGE COMMISSION 

WASHINGTON, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934

(Amendment No.   )

Filed by the Registrant	☒
Filed by a Party other than the Registrant	☐

Check the appropriate box:
☐	Preliminary Proxy Statement
☐	Confidential, For Use of the Commission Only (as Permitted by Rule 14a-6(e)(2))
☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Pursuant to § 240.14a-12

MAGNITE, INC. 

(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):
☒	No fee required

☐	Fee paid previously with preliminary materials
☐	Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

Important Notice of Availability of Proxy Materials for the Annual Meeting of Stockholders of

TO BE HELD ON:

Wednesday, June 12, 2024 at 12:00 p.m., Eastern Time

By Virtual Meeting via live webcast

COMPANY NUMBER

ACCOUNT NUMBER

CONTROL NUMBER

This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. 

If you want to receive a paper or e-mail copy of the proxy materials you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below before May 29, 2024. 

Please visit http://www.astproxyportal.com/ast/18899/, where the following materials are available for view: 

• Notice of Annual Meeting of Stockholders

• Proxy Statement

• Form of Electronic Proxy Card

• Annual Report on Form 10-K

TO REQUEST MATERIAL:		TELEPHONE: 888-Proxy-NA (888-776-9962) or 201-299-6210 (for international callers) E-MAIL: help@equiniti.com
		WEBSITE: https://us.astfinancial.com/OnlineProxyVoting/ProxyVoting/RequestMaterials
TO VOTE:		ONLINE: To access your online proxy card, please visit www.voteproxy.com and follow the on-screen instructions or scan the QR code with your smartphone. You may enter your voting instructions at www.voteproxy.com up until 11:59 PM Eastern Time the day before the meeting date.
		VIRTUALLY AT THE MEETING: The company will be hosting the meeting live via the Internet this year. To attend the meeting via the Internet please visit https://web.lumiconnect.com/293659257 (password: magnite2024) and be sure to have available the control number.
		TELEPHONE: To vote by telephone, please visit www.voteproxy.com to view the materials and to obtain the toll free number to call.
		MAIL: You may request a card by following the instructions above.

	1.	Election of Directors:
		Sarah P. Harden
		James Rossman
		Diane Yu
	2.	To ratify the selection of Deloitte & Touche LLP as the company’s independent registered public accounting firm for the current fiscal year.
	3.	To approve, on an advisory basis, of the compensation of the company's named executive officers.
	4.	To transact such other business as may properly come before the meeting or any postponements or adjournments thereof.
	THE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” THE ELECTION OF DIRECTORS, “FOR” PROPOSAL 2 AND “FOR” PROPOSAL 3.
Please note that you cannot use this notice to vote by mail.