Magnite Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

DB:15R Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
10 Aug 26	Sell€209,153	Rachel Lam	Individual	10,000	€20.92
10 Aug 26	Sell€266,620	Brian Gephart	Individual	12,479	€21.37
06 Aug 26	Sell€155,751	David Buonasera	Individual	7,649	€21.70
06 Aug 26	Sell€802,852	Sean Buckley	Individual	38,476	€21.77
10 Jul 26	Sell€90,269	Paul Caine	Individual	5,000	€18.05
19 May 26	Sell€114,971	Robert Spillane	Individual	10,000	€11.50
21 Nov 25	Sell€154,571	Robert Spillane	Individual	12,500	€12.37
09 Sep 25	Sell€856,201	Sean Buckley	Individual	40,000	€21.81
29 Aug 25	Sell€276,429	Aaron Saltz	Individual	12,403	€22.29
27 Aug 25	Sell€472,886	Katie Evans	Individual	21,509	€21.99
26 Aug 25	Sell€432,896	Diane Yu	Individual	20,000	€21.64

Insider Trading Volume

Insider Buying: 15R insiders have only sold shares in the past 3 months.

Ownership Breakdown

What is the ownership structure of 15R?
Owner Type	Number of Shares	Ownership Percentage
Individual Insiders	1,950,565	1.38%
Institutions	139,888,201	98.6%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 67.88% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
8.86%	BlackRock, Inc.	12,713,156	€259.7m	9.06%	no data
5.72%	Vanguard Portfolio Management, LLC	8,197,286	€167.4m	6.1%	0.01%
5.41%	FMR LLC	7,756,531	€158.4m	72.2%	0.01%
5.03%	Vanguard Capital Management, LLC	7,214,287	€147.4m	0.37%	no data
4.21%	Wellington Management Group LLP	6,044,492	€123.5m	-34.2%	0.02%
3.67%	Dimensional Fund Advisors LP	5,260,132	€107.4m	32%	0.01%
3.5%	Boston Partners Global Investors, Inc.	5,013,835	€102.4m	6.23%	0.06%
3.22%	American Century Investment Management Inc	4,622,736	€94.4m	-0.09%	0.04%
2.7%	Capital Research and Management Company	3,869,159	€79.0m	-29.4%	no data
2.64%	Geode Capital Management, LLC	3,789,959	€77.4m	6.65%	no data
2.48%	Edenbrook Capital, Llc	3,555,615	€72.6m	27.1%	30.55%
2.46%	State Street Investment Management	3,528,075	€72.1m	11.5%	no data
2.43%	Nine Ten Capital Management, LLC	3,481,283	€71.1m	15.9%	23.49%
1.99%	Teachers Insurance and Annuity Association-College Retirement Equities Fund	2,847,648	€58.2m	8.66%	0.01%
1.78%	Granahan Investment Management, LLC	2,553,413	€52.2m	-18.1%	2.23%
1.48%	Ophir Asset Management Pty Ltd	2,118,016	€43.3m	-11.2%	3.74%
1.4%	325 Capital, LLC	2,005,387	€41.0m	0%	15.26%
1.22%	Kennedy Capital Management LLC	1,753,542	€35.8m	22.1%	0.76%
1.19%	Blue Grotto Capital, LLC	1,706,741	€34.9m	28.4%	3.34%
1.16%	Jane Street Group, LLC	1,668,160	€34.1m	339%	0.03%
1.14%	No Street GP LP	1,628,248	€33.3m	10.4%	2.25%
1.12%	Schonfeld Strategic Advisors LLC	1,605,041	€32.8m	106%	0.27%
1.08%	Northern Trust Global Investments	1,553,412	€31.7m	17.5%	no data
1.05%	Balyasny Asset Management L.P.	1,500,443	€30.6m	71.8%	0.07%
0.95%	Royce & Associates, LP	1,365,489	€27.9m	17.1%	0.26%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/08/20 16:56
End of Day Share Price	2026/08/20 00:00
Earnings	2026/06/30
Annual Earnings	2025/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Magnite, Inc. is covered by 27 analysts. 11 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Daniel Kurnos	Benchmark Company
Alexandra Ross	Berenberg
Omar Dessouky	BofA Global Research