Katie Seitz Evans - 30 Jun 2025 Form 4 Insider Report for MAGNITE, INC. (MGNI)

Reporting relationship: President, Operations
Issuer ticker: MGNI
Reported as of: 30 Jun 2025
Net transaction value: -$512,909
SEC form: 4
Accepted by SEC: 02 Jul 2025, 16:15:43 UTC
Prior SEC filing: 18 Jun 2025
Next SEC filing: 20 Aug 2025
Source filing: View source filing
Reporting owner signature: /s/ Aaron Saltz, attorney-in-fact

Key filing fact

Katie Seitz Evans filed Form 4 for MAGNITE, INC. (MGNI) on 02 Jul 2025.

Key facts

This page summarizes Katie Seitz Evans's Form 4 filing for MAGNITE, INC. (MGNI).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 02 Jul 2025, 16:15.

Change

Previous filing in this sequence was filed on 18 Jun 2025.
Current net transaction value: -$512,909.

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 0001700262 Primary reporting owner

Evans Katie Seitz

Relationship: President, Operations
Address: C/O MAGNITE, INC., 1250 BROADWAY, 15TH FLOOR, NEW YORK
Signature: /s/ Aaron Saltz, attorney-in-fact
Signature date: 02 Jul 2025

Reported non-derivative transactions

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

MGNI transaction

Common Stock

Options Exercise

Transaction value: $58,255
Shares: +16,137
Change %: +3.6%
Price: $3.61
Shares after: 458,925
Date: 30 Jun 2025
Ownership: Direct
Footnotes: F1

MGNI transaction

Common Stock

Sale

Transaction value: $183,876
Shares: -8,358
Change %: -1.8%
Price: $22.00
Shares after: 450,567
Date: 30 Jun 2025
Ownership: Direct
Footnotes: F1

MGNI transaction

Common Stock

Sale

Transaction value: $387,288
Shares: -16,137
Change %: -3.6%
Price: $24.00
Shares after: 434,430
Date: 30 Jun 2025
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MGNI transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -16,137
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 30 Jun 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 16,137
Exercise price: $3.61
Footnotes: F1, F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote F1

This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

Footnote F2

25% of the total number of shares underlying this option vested on February 14, 2019 and the remaining shares vested 1/36 per month over the next 36 months thereafter.

Footnote F3

Granted as compensation for services.