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Form 4 reporting owner · CIK 0001700262

Evans Katie Seitz

Officer

Katie Evans has served as our President, Product & Operations since April 2026. Prior to that, Ms. Evans served as our President, Operations from January 2025 through March 2026, our Chief Operating Officer from September 2020 through December 2024 and our General Manager, CTV from April 2020 through August 2020. Previously, she served as Chief Operating Officer of Telaria from March 2017 to April 2020 and as Senior Vice President, Strategy and Operations, from November 2015 to March 2017. Ms. Evans holds a B.S. in Business Administration from the University of Richmond. Brian Gephart has served as our Chief Accounting Officer since June 2021. Prior to joining the Company, Mr. Gephart served as the Chief…

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

33Open-market trades
3Tickers
—Avg 90d after buys
+19.1%Avg 90d after sales
—Avg 180d after buys
+33.5%Avg 180d after sales

MGNI price and prints

MGNITRMRTLRA

MAGNITE, INC. 30 open-market prints by this insider, 2/16/2021 – 9/11/2026. Triangles mark only their Form 4 purchases and sales. Full MGNI chart

MGNI adjusted close▲ buy▼ sale
5.7819.7833.7947.7961.802026-09-11 sell Evans Katie Seitz2026-09-09 sell Evans Katie Seitz2026-09-08 sell Evans Katie Seitz2026-08-06 sell Evans Katie Seitz2025-08-27 sell Evans Katie Seitz2025-08-25 sell Evans Katie Seitz2025-08-18 sell Evans Katie Seitz2025-06-30 sell Evans Katie Seitz2025-06-16 sell Evans Katie Seitz2025-06-05 sell Evans Katie Seitz2025-02-07 sell Evans Katie Seitz2024-11-11 sell Evans Katie Seitz2024-06-13 sell Evans Katie Seitz2023-08-16 sell Evans Katie Seitz2023-07-11 sell Evans Katie Seitz2023-06-12 sell Evans Katie Seitz2023-05-16 sell Evans Katie Seitz2023-03-01 sell Evans Katie Seitz2022-04-06 sell Evans Katie Seitz2021-09-14 sell Evans Katie Seitz2021-09-13 sell Evans Katie Seitz2021-08-16 sell Evans Katie Seitz2021-05-17 sell Evans Katie Seitz2021-04-05 sell Evans Katie Seitz2021-04-01 sell Evans Katie Seitz2021-02-16 sell Evans Katie Seitz2021-01-262026-09-18

MGNI trades

Clear
DateForm 4TickerSideSharesValue90d180d
9/11/2026
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		SELL13,997$335.9K+19.1%hist+33.5%hist
9/9/2026
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		SELL11,100$260.4K+19.1%hist+33.5%hist
9/8/2026
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		SELL32,285$762.9K+19.1%hist+33.5%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		SELL20,000$480.0K+19.1%hist+33.5%hist
8/27/2025
Form 4
MGNIMAGNITE, INCPresident, Operations
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		SELL21,509$548.9K+42.0%+55.7%
8/25/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Operations
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		SELL8,345$217.0K+41.8%+55.3%
8/18/2025
Form 4
MGNIMAGNITE, INCPresident, Operations
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		SELL10,487$250.1K+45.1%+52.4%
6/30/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Operations
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		SELL8,358$183.9K+7.63%+31.8%
6/30/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Operations
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		SELL16,137$387.3K+7.63%+31.8%
6/16/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Operations
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$370.0K−27.7%+14.7%
6/5/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Operations
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		SELL35,000$607.6K−40.5%+17.5%
2/7/2025
Form 410b5-1
MGNIMAGNITE, INCPresident, Operations
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		SELL12,520$250.4K+29.7%−6.19%
11/11/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF OPERATING 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		SELL12,824$205.2K−30.3%−1.96%
6/13/2024
Form 410b5-1
MGNIMAGNITE, INCCHIEF OPERATING 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		SELL14,541$200.2K+6.78%−21.2%
8/16/2023
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL7,038$58.5K+8.15%−15.7%
7/11/2023
Form 410b5-1
MGNIMAGNITE, INCChief Operating 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		SELL17,774$266.6K+51.1%+37.8%
6/12/2023
Form 410b5-1
MGNIMAGNITE, INCChief Operating 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		SELL11,098$149.0K+39.4%+36.9%
5/16/2023
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL7,450$81.1K+19.6%+34.8%
3/1/2023
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL78,155$858.9K−9.96%+28.5%
4/6/2022
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL15,805$207.5K+26.1%+47.4%
9/14/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL32,260$967.8K+41.0%+64.4%
9/13/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL28,584$810.1K+39.3%+63.3%
9/13/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL870$25.1K+39.3%+63.3%
9/13/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL2,476$74.2K+39.3%+63.3%
8/16/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL3,329$89.3K+19.4%+52.4%
5/17/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL12,438$323.1K−9.23%+12.0%
4/5/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL27,896$1.12M+14.8%+36.0%
4/1/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL55,363$2.44M+20.9%+33.0%
4/1/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL40,238$1.74M+20.9%+33.0%
2/16/2021
Form 4
MGNIMAGNITE, INCChief Operating 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		SELL30,138$1.69M+54.8%+50.6%

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.