David Day - 24 Jun 2025 Form 4 Insider Report for MAGNITE, INC. (MGNI)

Reporting relationship: CHIEF FINANCIAL OFFICER
Issuer ticker: MGNI
Reported as of: 24 Jun 2025
Net transaction value: -$1,077,570
SEC form: 4
Accepted by SEC: 26 Jun 2025, 17:21:23 UTC
Prior SEC filing: 20 Jun 2025
Next SEC filing: 02 Jul 2025
Source filing: View source filing
Reporting owner signature: /s/ Aaron Saltz, attorney-in-fact

Key filing fact

David Day filed Form 4 for MAGNITE, INC. (MGNI) on 26 Jun 2025.

Key facts

This page summarizes David Day's Form 4 filing for MAGNITE, INC. (MGNI).
6 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 26 Jun 2025, 17:21.

Change

Previous filing in this sequence was filed on 20 Jun 2025.
Current net transaction value: -$1,077,570.

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 0001523288 Primary reporting owner

Day David

Relationship: CHIEF FINANCIAL OFFICER
Address: C/O MAGNITE, INC., 1250 BROADWAY, 15TH FLOOR, NEW YORK
Signature: /s/ Aaron Saltz, attorney-in-fact
Signature date: 26 Jun 2025

Reported non-derivative transactions

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

MGNI transaction

Common Stock

Options Exercise

Transaction value: $184,800
Shares: +35,000
Change %: +7.9%
Price: $5.28
Shares after: 478,528
Date: 24 Jun 2025
Ownership: Direct
Footnotes: F1

MGNI transaction

Common Stock

Sale

Transaction value: $698,250
Shares: -35,000
Change %: -7.3%
Price: $19.95
Shares after: 443,528
Date: 24 Jun 2025
Ownership: Direct
Footnotes: F1

MGNI transaction

Common Stock

Options Exercise

Transaction value: $190,080
Shares: +36,000
Change %: +8.1%
Price: $5.28
Shares after: 479,528
Date: 26 Jun 2025
Ownership: Direct
Footnotes: F1

MGNI transaction

Common Stock

Sale

Transaction value: $754,200
Shares: -36,000
Change %: -7.5%
Price: $20.95
Shares after: 443,528
Date: 26 Jun 2025
Ownership: Direct
Footnotes: F1

Reported derivative securities

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

MGNI transaction Derivative

Employee Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -35,000
Change %: -30%
Price: $0.000000
Shares after: 80,784
Date: 24 Jun 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 35,000
Exercise price: $5.28
Footnotes: F1, F2, F3

MGNI transaction Derivative

Employee Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -36,000
Change %: -45%
Price: $0.000000
Shares after: 44,784
Date: 26 Jun 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 36,000
Exercise price: $5.28
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

The reported transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 13, 2025.

Footnote F2

25% of the stock options vested on April 1, 2021 and the remaining options shares vested in 36 equal installments each calendar month thereafter.

Footnote F3

Granted as compensation for services.