0001966857-26-000006.txt : 20260603 0001966857-26-000006.hdr.sgml : 20260603 20260603164507 ACCESSION NUMBER: 0001966857-26-000006 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20260601 FILED AS OF DATE: 20260603 DATE AS OF CHANGE: 20260603 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Buonasera David CENTRAL INDEX KEY: 0001966857 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-36384 FILM NUMBER: 261061544 MAIL ADDRESS: STREET 1: C/O MAGNITE, INC. STREET 2: 1250 BROADWAY, 15TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10001 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: 9TH FLOOR CITY: NEW YORK STATE: NY BUSINESS PHONE: 212-243-2769 MAIL ADDRESS: STREET 1: 1250 BROADWAY STREET 2: 9TH FLOOR CITY: NEW YORK STATE: NY FORMER COMPANY: FORMER CONFORMED NAME: RUBICON PROJECT, INC. DATE OF NAME CHANGE: 20140106 4 1 form4-06032026_040601.xml X0609 4 2026-06-01 0001595974 MAGNITE, INC. MGNI 0001966857 Buonasera David false C/O MAGNITE, INC. 1250 BROADWAY, 9TH FLOOR NEW YORK NY 10001 false true false false CHIEF TECHNOLOGY OFFICER 1 Common Stock 2026-06-01 4 S 0 1409 15 D 292784 D The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025. /s/ Aaron Saltz, attorney-in-fact 2026-06-03