Magnite MGNI Institutional Ownership

NASDAQ MGNI

$23.36 -0.26 (-1.08%)

As of: Oct 22, 2026 · 12:01 PM EDT

Institutions by Trading Activity

308 Institutions

Increased 170 55.2%

Unchanged 48 15.6%

Reduced 90 29.2%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

98.63%

▲+7.38 pp QoQ

Shares Held by Institutions

141.42Mn

of 143.38Mn outstanding

▲+7.97% QoQ

Shares Outstanding

143.38Mn

1.97Mn held outside 13F filers

Institutional Investors

308

filed 13F for Jun 2026

▲+15 vs prior quarter

Net Shares Added (QoQ)

+10.44Mn

accumulated since last quarter

Value of Holdings

$3.37Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 11, 2026

Magnite, Inc. (NASDAQ:MGNI) appeared in the 13F filings of 308 institutional investors for the quarter ended June 30, 2026.

Collectively, these holders controlled 98.63% of Magnite's outstanding shares in Q2 2026, up from 91.25% in Q1 2026.
Total holdings of MGNI shares rose 7.97% from Q1 2026, and the holder count rose 10.39% from Q2 2025.
Among the 308 holders of Magnite, 170 added to their positions, 90 reduced their stakes and 48 left their positions unchanged.
Combined, institutional investors held 141.42Mn shares of MGNI as of Q2 2026, up 10.44Mn from the prior quarter and down 3.33Mn from a year earlier.
BlackRock, Inc. held the largest position in MGNI at 12.71Mn shares as of June 30, 2026, or 8.87% of shares outstanding.
Holders that added the most shares of Magnite in Q2 2026 were FMR LLC (+3.25Mn shares), Canada Pension Plan Investment Board (+2.95Mn shares), 325 Capital LLC (+1.41Mn shares), Park West Asset Management LLC (+1.4Mn shares) and Qube Research & Technologies Ltd (+1.29Mn shares).
The biggest cuts to MGNI positions during Q2 2026 came from Wellington Management Group LLP (-3.15Mn shares), Capital Research Global Investors (-1.15Mn shares), Schonfeld Strategic Advisors LLC (-1.04Mn shares), Balyasny Asset Management L.P. (-833.89K shares) and Ophir Asset Management Pty Ltd (-667.96K shares).
Per Business Quant data, the 10 largest holders of Magnite at the end of Q2 2026 were BlackRock, Inc. (12.71Mn shares), Vanguard Portfolio Management LLC (8.2Mn shares), FMR LLC (7.76Mn shares), Vanguard Capital Management LLC (6.23Mn shares), Wellington Management Group LLP (6.04Mn shares), Dimensional Fund Advisors LP (5.26Mn shares), Boston Partners (5.01Mn shares), American Century Companies Inc (4.62Mn shares), Capital Research Global Investors (3.87Mn shares) and Nuveen, LLC (3.79Mn shares).

Form 13F Holdings

308 Institutional Holders

Report period 30 Jun, 2026

Total shares held 141.42Mn

Of outstanding 98.63%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	12,713,156	8.87%	▲1,055,660	+9.06%	$241.30Mn
2	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	8,197,286	5.72%	▲471,081	+6.10%	$155.58Mn
3	FMR LLC	0000315066	7,759,426	5.41%	▲3,252,007	+72.15%	$147.27Mn
4	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	6,225,195	4.34%	▲34,792	+0.56%	$118.15Mn
5	WELLINGTON MANAGEMENT GROUP LLP	0000902219	6,044,492	4.22%	▼3,146,585	-34.24%	$114.72Mn
6	DIMENSIONAL FUND ADVISORS LP	0000354204	5,260,132	3.67%	▲1,276,458	+32.04%	$99.84Mn
7	Boston Partners	0001386060	5,013,835	3.50%	▲293,972	+6.23%	$95.85Mn
8	AMERICAN CENTURY COMPANIES INC	0000748054	4,622,736	3.22%	▼4,080	-0.09%	$87.74Mn
9	Capital Research Global Investors	0001422848	3,869,159	2.70%	▼1,151,130	-22.93%	$73.44Mn
10	Nuveen, LLC	0001871926	3,794,811	2.65%	▲204,786	+5.70%	$72.03Mn
11	GEODE CAPITAL MANAGEMENT, LLC	0001214717	3,789,959	2.64%	▲236,169	+6.65%	$71.95Mn
12	Edenbrook Capital, LLC	0001666682	3,555,615	2.48%	▲757,579	+27.08%	$67.49Mn
13	State Street Corp	0000093751	3,528,075	2.46%	▲364,936	+11.54%	$66.96Mn
14	325 CAPITAL LLC	0001873893	3,412,694	2.38%	▲1,407,307	+70.18%	$64.77Mn
15	Nine Ten Capital Management LLC	0001635236	3,261,283	2.27%	▼220,000	-6.32%	$61.90Mn
16	Granahan Investment Management, LLC	0001026710	3,083,211	2.15%	▲529,798	+20.75%	$58.52Mn
17	CANADA PENSION PLAN INVESTMENT BOARD	0001283718	2,995,093	2.09%	▲2,949,041	+6,403.72%	$56.85Mn
18	JANE STREET GROUP, LLC	0001595888	2,199,191	1.53%	▲531,031	+31.83%	$41.74Mn
19	Park West Asset Management LLC	0001386928	2,000,000	1.39%	▲1,401,620	+234.24%	$37.96Mn
20	Morgan Stanley	0000895421	1,991,732	1.39%	▲1,064,913	+114.90%	$37.80Mn

Showing 1 to 20 of 308 holders