David Day - 18 Jun 2025 Form 4 Insider Report for MAGNITE, INC. (MGNI)

Signature
/s/ Aaron Saltz, attorney-in-fact
Issuer symbol
MGNI
Transactions as of
18 Jun 2025
Net transactions value
-$535,188
Form type
4
Filing time
20 Jun 2025, 16:26:33 UTC
Previous filing
16 May 2025
Next filing
26 Jun 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Day David CHIEF FINANCIAL OFFICER C/O MAGNITE, INC., 1250 BROADWAY, 15TH FLOOR, NEW YORK /s/ Aaron Saltz, attorney-in-fact 20 Jun 2025 0001523288

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MGNI Common Stock Options Exercise $187,678 +38,146 +8.6% $4.92 481,674 18 Jun 2025 Direct F1
transaction MGNI Common Stock Sale $722,867 -38,146 -7.9% $18.95 443,528 18 Jun 2025 Direct F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MGNI Employee Stock Option (Right to Buy) Options Exercise $0 -38,146 -100% $0.000000 0 18 Jun 2025 Common Stock 38,146 $4.92 Direct F1, F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 The reported transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 13, 2025.
F2 25% of the stock options vested on February 1, 2020 and the remaining option shares vested in 36 equal installments each calendar month thereafter.
F3 Granted as compensation for services.