0001415889-25-017858.txt : 20250620 0001415889-25-017858.hdr.sgml : 20250620 20250620162633 ACCESSION NUMBER: 0001415889-25-017858 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20250618 FILED AS OF DATE: 20250620 DATE AS OF CHANGE: 20250620 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Day David CENTRAL INDEX KEY: 0001523288 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-36384 FILM NUMBER: 251061766 MAIL ADDRESS: STREET 1: 21700 OXNARD STREET STREET 2: SUITE 1600 CITY: WOODLAND HILLS STATE: CA ZIP: 91367 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: MAGNITE, INC. CENTRAL INDEX KEY: 0001595974 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC. [7370] ORGANIZATION NAME: 06 Technology EIN: 208881738 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 1250 BROADWAY STREET 2: 15TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10001 BUSINESS PHONE: 212-243-2769 MAIL ADDRESS: STREET 1: 1250 BROADWAY STREET 2: 15TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10001 FORMER COMPANY: FORMER CONFORMED NAME: RUBICON PROJECT, INC. DATE OF NAME CHANGE: 20140106 4 1 form4-06202025_080628.xml X0508 4 2025-06-18 0001595974 MAGNITE, INC. MGNI 0001523288 Day David C/O MAGNITE, INC. 1250 BROADWAY, 15TH FLOOR NEW YORK NY 10001 false true false false CHIEF FINANCIAL OFFICER 1 Common Stock 2025-06-18 4 M 0 38146 4.92 A 481674 D Common Stock 2025-06-18 4 S 0 38146 18.95 D 443528 D Employee Stock Option (Right to Buy) 4.92 2025-06-18 4 M 0 38146 0 D 2029-02-20 Common Stock 38146 0 D The reported transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 13, 2025. 25% of the stock options vested on February 1, 2020 and the remaining option shares vested in 36 equal installments each calendar month thereafter. Granted as compensation for services. /s/ Aaron Saltz, attorney-in-fact 2025-06-20