Magnite, Inc. (MGNI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

144,925,000Shares Outstanding

824,037Shares held by institutions

$9,534,108Value of institutional holdings

95.91%Institutional ownership %

5.00%Shares Changed QoQ

289No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

A total of 289 institutions have reported a stake in Magnite, Inc. (NASDAQ:MGNI) as of December 2025, according to recent 13F filings with the SEC.

Magnite saw its institutional ownership percentage fell to 95.9% in December 2025 from 98.3% in September 2025.
The company experienced a 5.00% quarterly change in institutional shares held, alongside an increase of 3.21% in total owners annually.
Of these 289 institutional investors, 172 increased their holdings in Magnite, while 86 of them reduced positions, and 31 investors maintained their exposure.
The aggregate institutional position in Magnite now stands at 139.00Mn shares as of December 2025, after investors increased their holdings (up by 6.61Mn shares quarter on quarter which is up 12.68Mn shares year over year).
With 14.80Mn shares, VANGUARD GROUP INC commands the largest institutional position in Magnite as of December 31, 2025, equating to 10.21% of the company.
Among the most significant buyers of Magnite during December 2025 were Capital Research Global Investors (5.94Mn), WELLINGTON MANAGEMENT GROUP LLP (3.48Mn), Ophir Asset Management Pty Ltd (2.38Mn), No Street GP LP (1.48Mn), 325 CAPITAL LLC (1.36Mn).
Leading sellers of Magnite stock in December 2025 included FMR LLC (10.44Mn), JANE STREET GROUP, LLC (787.37K), Granahan Investment Management, LLC (757.25K), NOMURA ASSET MANAGEMENT CO LTD (717.07K), Caption Management, LLC (709.00K).
The top 10 institutional holders of Magnite for the quarter ending December 2025 included VANGUARD GROUP INC (14.80Mn), Capital Research Global Investors (12.92Mn), BlackRock, Inc. (11.59Mn), WELLINGTON MANAGEMENT GROUP LLP (8.63Mn), FMR LLC (6.70Mn), AMERICAN CENTURY COMPANIES INC (5.29Mn), Boston Partners (4.11Mn), DIMENSIONAL FUND ADVISORS LP (3.62Mn), Nuveen, LLC (3.53Mn), GEODE CAPITAL MANAGEMENT, LLC (3.43Mn).

289 Institutional Holders

824,037 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	31 Dec, 2025	14,802,630	148,198	1.01%	$240,246,684.00
Capital Research Global Investors	31 Dec, 2025	12,920,289	5,937,428	85.03%	$209,696,290.00
BlackRock, Inc.	31 Dec, 2025	11,593,249	180,094	1.58%	$188,158,440.00
WELLINGTON MANAGEMENT GROUP LLP	31 Dec, 2025	8,629,238	3,484,689	67.74%	$140,052,533.00
FMR LLC	31 Dec, 2025	6,701,174	-10,439,840	-60.91%	$108,760,051.00
AMERICAN CENTURY COMPANIES INC	31 Dec, 2025	5,286,928	692,858	15.08%	$85,806,867.00
Boston Partners	31 Dec, 2025	4,108,893	-340,111	-7.64%	$66,596,374.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	3,615,820	48,566	1.36%	$58,687,197.00
Nuveen, LLC	31 Dec, 2025	3,531,108	439,072	14.20%	$57,309,883.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	3,434,062	34,969	1.03%	$55,744,057.00
STATE STREET CORP	31 Dec, 2025	3,141,991	15,201	0.49%	$50,994,514.00
Granahan Investment Management, LLC	31 Dec, 2025	3,115,930	-757,249	-19.55%	$50,571,544.00
Nine Ten Capital Management LLC	31 Dec, 2025	3,003,583	145,000	5.07%	$48,748,000.00
Edenbrook Capital, LLC	31 Dec, 2025	2,788,036	677,666	32.11%	$45,249,825.00
Ophir Asset Management Pty Ltd	31 Dec, 2025	2,384,187	2,384,187	0.00%	$38,695,355.00
325 CAPITAL LLC	31 Dec, 2025	2,005,387	1,355,326	208.49%	$32,547,431.00
MORGAN STANLEY	31 Dec, 2025	1,862,538	-183,699	-8.98%	$30,228,995.00
Squarepoint Ops LLC	31 Dec, 2025	1,769,338	-174,531	-8.98%	$28,716,356.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	1,761,037	-624,402	-26.18%	$28,581,630.00
Blue Grotto Capital, LLC	31 Dec, 2025	1,628,782	79,986	5.16%	$26,435,132.00

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