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Form 4 reporting owner · CIK 0001865116

Buckley Sean Patrick

Officer

Sean Buckley has served as our President, Revenue & Market Strategy since April 2026. Prior to that, Mr. Buckley served as our President, Revenue from January 2025 through March 2026, our Chief Revenue Officer from January 2022 through December 2024 and our Chief Revenue Officer, CTV, from May 2021 through December 2021. Previously, he served as the Chief Operating Officer for SpotX, Inc. from January 2020 to June 2021, Chief Revenue Officer from January 2017 to January 2020, SVP, Global Revenue from July 2014 to January 2017, and Vice President, Platform from June 2013 to July 2014. Mr. Buckley holds a B.S. in Business Administration from Northeastern University. David Buonasera has served as Chief…

Biography from the company’s latest DEF 14A proxy statement

28Open-market trades
1Ticker
—Avg 90d after buys
+6.04%Avg 90d after sales
—Avg 180d after buys
+2.14%Avg 180d after sales

MGNI price and prints

Full MGNI chart

MAGNITE, INC. 28 open-market prints by this insider, 5/16/2023 – 8/18/2026. Triangles mark only their Form 4 purchases and sales.

MGNI adjusted close▲ buy▼ sale
6.5111.5116.5221.5226.522026-08-18 sell Buckley Sean Patrick2026-08-17 sell Buckley Sean Patrick2026-08-06 sell Buckley Sean Patrick2026-07-07 sell Buckley Sean Patrick2026-06-17 sell Buckley Sean Patrick2025-11-24 sell Buckley Sean Patrick2025-11-18 sell Buckley Sean Patrick2025-09-09 sell Buckley Sean Patrick2025-09-08 sell Buckley Sean Patrick2025-08-19 sell Buckley Sean Patrick2025-08-18 sell Buckley Sean Patrick2025-05-16 sell Buckley Sean Patrick2025-02-19 sell Buckley Sean Patrick2025-02-07 sell Buckley Sean Patrick2024-11-18 sell Buckley Sean Patrick2024-11-11 sell Buckley Sean Patrick2024-08-20 sell Buckley Sean Patrick2024-08-19 sell Buckley Sean Patrick2024-07-16 sell Buckley Sean Patrick2024-07-15 sell Buckley Sean Patrick2024-06-05 sell Buckley Sean Patrick2024-05-24 sell Buckley Sean Patrick2024-05-16 sell Buckley Sean Patrick2023-08-16 sell Buckley Sean Patrick2023-06-02 sell Buckley Sean Patrick2023-05-16 sell Buckley Sean Patrick2023-04-252026-09-18

MGNI trades

Clear
DateForm 4TickerSideSharesValue90d180d
8/18/2026
Form 410b5-1
MGNIMAGNITE, INCOfficer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL2,759$69.0K+6.04%hist+2.14%hist
8/17/2026
Form 410b5-1
MGNIMAGNITE, INCOfficer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL8,271$201.1K+6.04%hist+2.14%hist
8/6/2026
Form 410b5-1
MGNIMAGNITE, INCOfficer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL47,942$1.20M+6.04%hist+2.14%hist
8/6/2026
Form 410b5-1
MGNIMAGNITE, INCOfficer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL19,237$442.5K+6.04%hist+2.14%hist
7/7/2026
Form 410b5-1
MGNIMAGNITE, INCOfficer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL19,233$404.5K+6.04%hist+2.14%hist
6/17/2026
Form 410b5-1
MGNIMAGNITE, INCOfficer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL19,233$365.4K−30.0%+2.14%hist
11/24/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL2,213$32.1K+23.2%+9.84%
11/18/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL4,426$59.1K+13.7%+0.07%
9/9/2025
Form 4
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL20,000$492.2K+38.9%+44.5%
9/8/2025
Form 4
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL20,000$511.2K+41.2%+46.6%
8/19/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL9,315$218.2K+38.8%+47.0%
8/18/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL10,886$259.6K+45.1%+52.4%
5/16/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL9,692$152.5K−51.8%+8.56%
2/19/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL10,527$201.4K+15.9%−27.5%
2/7/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Revenue
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL18,693$373.9K+29.7%−6.19%
11/18/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL10,001$156.0K−24.0%+2.05%
11/11/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL2,619$40.6K−30.3%−1.96%
11/11/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL2,623$38.0K−30.3%−1.96%
8/20/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL2,623$35.4K−17.7%−45.9%
8/19/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL2,623$32.9K−19.5%−48.1%
7/16/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL19,604$303.9K+21.7%+1.96%
7/15/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL19,607$284.3K+19.0%−1.44%
6/5/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL21,653$292.3K+1.54%−26.2%
5/24/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL2,682$33.5K−7.40%−27.5%
5/16/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF REVENUE OFFICER
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL16,925$211.6K−4.42%−35.9%
8/16/2023
Form 4
MGNIMAGNITE, INCChief Revenue Officer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL5,273$43.8K+8.15%−15.7%
6/2/2023
Form 4
MGNIMAGNITE, INCChief Revenue Officer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL12,219$158.7K+37.9%+37.6%
5/16/2023
Form 4
MGNIMAGNITE, INCChief Revenue Officer
MAGNITE, INC · Services-Computer Programming, Data Processing, Etc.IndustryServices-Computer Programming, Data Processing, Etc.Mkt cap (est.)$11.22BPrice$25.1552w high$25.6352w low$11.20		SELL5,640$61.4K+19.6%+34.8%

Chart uses split-adjusted closes from the first print through the latest available bar. Returns use the last close on or before the trade date and the first close on or after 90 and 180 calendar days. Sales are signed so a declining price is a positive result for the seller. Not investment advice.