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

Signature
/s/ Aaron Saltz, attorney-in-fact
Issuer symbol
MGNI
Transactions as of
24 Jun 2025
Net transactions value
-$1,077,570
Form type
4
Filing time
26 Jun 2025, 17:21:23 UTC
Previous filing
20 Jun 2025
Next filing
02 Jul 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 26 Jun 2025 0001523288

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MGNI Common Stock Options Exercise $184,800 +35,000 +7.9% $5.28 478,528 24 Jun 2025 Direct F1
transaction MGNI Common Stock Sale $698,250 -35,000 -7.3% $19.95 443,528 24 Jun 2025 Direct F1
transaction MGNI Common Stock Options Exercise $190,080 +36,000 +8.1% $5.28 479,528 26 Jun 2025 Direct F1
transaction MGNI Common Stock Sale $754,200 -36,000 -7.5% $20.95 443,528 26 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 -35,000 -30% $0.000000 80,784 24 Jun 2025 Common Stock 35,000 $5.28 Direct F1, F2, F3
transaction MGNI Employee Stock Option (Right to Buy) Options Exercise $0 -36,000 -45% $0.000000 44,784 26 Jun 2025 Common Stock 36,000 $5.28 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 April 1, 2021 and the remaining options shares vested in 36 equal installments each calendar month thereafter.
F3 Granted as compensation for services.