Magnite Ownership

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

Recent Insider Transactions

NasdaqGS:MGNI Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
02 Sep 26	SellUS$151,864	David Buonasera	Individual	6,414	US$25.00
10 Aug 26	SellUS$241,600	Rachel Lam	Individual	10,000	US$24.16
10 Aug 26	SellUS$307,982	Brian Gephart	Individual	12,479	US$24.68
06 Aug 26	SellUS$179,478	David Buonasera	Individual	7,649	US$25.00
06 Aug 26	SellUS$925,158	Sean Buckley	Individual	38,476	US$25.09
10 Jul 26	SellUS$103,200	Paul Caine	Individual	5,000	US$20.64
19 May 26	SellUS$133,300	Robert Spillane	Individual	10,000	US$13.33
21 Nov 25	SellUS$177,750	Robert Spillane	Individual	12,500	US$14.22

Insider Trading Volume

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

Ownership Breakdown

What is the ownership structure of MGNI?
Owner Type	Number of Shares	Ownership Percentage
Individual Insiders	1,918,824	1.29%
Institutions	146,468,217	98.7%

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

Top Shareholders

Top 25 shareholders own 70.75% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
8.86%	BlackRock, Inc.	12,713,156	US$299.4m	9.06%	no data
5.72%	Vanguard Portfolio Management, LLC	8,197,286	US$193.0m	6.1%	0.01%
5.41%	FMR LLC	7,756,531	US$182.7m	72.2%	0.01%
5.03%	Vanguard Capital Management, LLC	7,214,287	US$169.9m	0.37%	no data
4.21%	Wellington Management Group LLP	6,044,492	US$142.3m	-34.2%	0.02%
3.67%	Dimensional Fund Advisors LP	5,260,132	US$123.9m	32%	0.01%
3.5%	Boston Partners Global Investors, Inc.	5,013,835	US$118.1m	6.23%	0.06%
3.22%	American Century Investment Management Inc	4,622,736	US$108.9m	-0.09%	0.04%
2.7%	Capital Research and Management Company	3,869,159	US$91.1m	-29.4%	no data
2.64%	Geode Capital Management, LLC	3,789,959	US$89.3m	6.65%	no data
2.48%	Edenbrook Capital, Llc	3,555,615	US$83.7m	27.1%	33.61%
2.46%	State Street Investment Management	3,528,075	US$83.1m	11.5%	no data
2.38%	325 Capital, LLC	3,412,694	US$80.4m	70.2%	22.62%
2.27%	Nine Ten Capital Management, LLC	3,261,283	US$76.8m	-6.32%	25.46%
2.15%	Granahan Investment Management, LLC	3,083,211	US$72.6m	20.8%	2.78%
2.09%	Canada Pension Plan Investment Board	2,995,093	US$70.5m	6,400%	0.03%
1.99%	Teachers Insurance and Annuity Association-College Retirement Equities Fund	2,847,648	US$67.1m	8.66%	0.01%
1.53%	Jane Street Group, LLC	2,199,191	US$51.8m	31.8%	0.03%
1.39%	Park West Asset Management LLC	2,000,000	US$47.1m	234%	3.51%
1.36%	Qube Research & Technologies Ltd	1,955,989	US$46.1m	196%	0.05%
1.22%	Morgan Stanley	1,751,867	US$41.3m	144%	no data
1.19%	Blue Grotto Capital, LLC	1,706,741	US$40.2m	28.4%	3.41%
1.16%	Kennedy Capital Management LLC	1,666,799	US$39.3m	-4.95%	0.74%
1.08%	Northern Trust Global Investments	1,553,412	US$36.6m	17.5%	no data
1.03%	Royce & Associates, LP	1,473,397	US$34.7m	7.9%	0.28%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/09/11 13:23
End of Day Share Price	2026/09/11 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 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
Alexandra Ross	Berenberg
Omar Dessouky	BofA Global Research
Zachary Cummins	B. Riley Securities, Inc.