Magnite, Inc. (MGNI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

153,166,000Shares Outstanding

137,800,905Shares held by institutions

$1,791,411,765Value of institutional holdings

89.97%Institutional ownership %

4.80%Shares Changed QoQ

297No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Magnite, Inc. (NASDAQ:MGNI) has 296 institutional investors with active 13F positions as of December 2025.

These investors collectively held 88.8% of Magnite's outstanding shares in December 2025, down from 91.8% in September 2025.
They increased total shares held in Magnite by 3.74% from the prior quarter, while the number of investors in MGNI increased 5.71% year over year.
During the quarter, 177 of these 296 funds increased positions in MGNI, 87 reduced exposure, and 32 held steady.
Altogether, these fund groups held 135.97Mn shares in MGNI by December 2025, up by 4.9Mn shares quarter on quarter, and up 9.28Mn shares year over year.
Maestria Partners LLC holds the largest position in MGNI at 1.36Mn shares as of December 31, 2025, or 0.89% of shares outstanding.
Top purchasers of MGNI stock for the quarter ending December 2025 included Kopion Asset Management, LLC (241.44K), Penbrook Management LLC (81.08K), P.A.W. CAPITAL CORP (30.0K), Cardinal Point Capital Management ULC (26.42K), Linden Thomas Advisory Services, LLC (26.42K).
The largest sellers of Magnite for the quarter ending December 2025 were MOODY NATIONAL BANK TRUST DIVISION (42.87K), STRS OHIO (16.7K), Winthrop Advisory Group LLC (14.52K), PERKINS CAPITAL MANAGEMENT INC (2.5K), SG Americas Securities, LLC (2.01K).
Per Business Quant data, the top 10 holders of Magnite for the quarter ending December 2025 are Maestria Partners LLC (1.36Mn), Kopion Asset Management, LLC (855.9K), 1492 Capital Management LLC (340.54K), WEDGE CAPITAL MANAGEMENT L L P/NC (189.77K), P.A.W. CAPITAL CORP (170.0K), PERKINS CAPITAL MANAGEMENT INC (119.28K), Penbrook Management LLC (112.19K), Cardinal Point Capital Management ULC (94.95K), STEINBERGANNA WEALTH MANAGEMENT (69.02K), PINNACLE ASSOCIATES LTD (65.76K).

300 Institutional Holders

137,800,905 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
Goldman Sachs Group Inc	31 Dec, 2025	3,522,074	1,136,635	47.65%	$57,163,260.00
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
Blue Grotto Capital, LLC	31 Dec, 2025	1,628,782	79,986	5.16%	$26,435,132.00
No Street GP LP	31 Dec, 2025	1,475,000	1,475,000	0.00%	$23,939,250.00

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