Brian Gephart - 01 Oct 2026 Form 4 Insider Report for MAGNITE, INC. (MGNI)

Reporting relationship: CHIEF FINANCIAL OFFICER
Issuer ticker: MGNI
Reported as of: 01 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Oct 2026, 16:21:51 UTC
Prior SEC filing: 18 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Aaron Saltz, attorney-in-fact

Key filing fact

Brian Gephart filed Form 4 for MAGNITE, INC. (MGNI) on 02 Oct 2026.

Key facts

This page summarizes Brian Gephart's Form 4 filing for MAGNITE, INC. (MGNI).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 02 Oct 2026, 16:21.

Change

Previous filing in this sequence was filed on 18 Aug 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001778484 Primary reporting owner

Gephart Brian

Relationship: CHIEF FINANCIAL OFFICER
Address: C/O MAGNITE, INC., 1250 BROADWAY, 9TH FLOOR, NEW YORK
Signature: /s/ Aaron Saltz, attorney-in-fact
Signature date: 02 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MGNI transaction

Common Stock

Award

Transaction value
Shares: +64,682
Change %: +63%
Price: $0.000000^*
Shares after: 167,010
Date: 01 Oct 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Represents restricted stock units that vest as follows: 17,518 on November 15, 2027, 4,043 on each February 15, May 15, August 15, and November 15 thereafter until August 15, 2030 and 2,691 on November 15, 2030, subject to continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances.

Footnote F2

Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan.