Magnite MGNI Institutional Ownership

NASDAQ MGNI

$25.15 -0.48 (-1.87%)

At close: Sep 18, 2026 · 4:00 PM EDT

Institutions by Trading Activity

309 Institutions

Increased 169 54.7%

Unchanged 48 15.5%

Reduced 92 29.8%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

99.72%

▲+7.82 pp QoQ

Shares Held by Institutions

142.62Mn

of 143.02Mn outstanding

▲+11.03% QoQ

Shares Outstanding

143.02Mn

404.89K held outside 13F filers

Institutional Investors

309

filed 13F for Jun 2026

▲+16 vs prior quarter

Net Shares Added (QoQ)

+14.17Mn

accumulated since last quarter

Value of Holdings

$3.59Bn

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

Quarter ending 30 Jun, 2026

Magnite, Inc. (NASDAQ:MGNI) appears in 309 institutional 13F filings for the quarter ending June 2026.

They owned 99.7% of outstanding stock in June 2026, up from 91.9% the prior quarter.
They increased total shares held in Magnite by 11.03% from the prior quarter, while the number of investors in MGNI increased 9.96% year over year.
Among the 309 funds, 169 bought more Magnite shares, 92 sold down, and 48 held their ground.
In total, institutional investors held 142.62Mn shares in Magnite as of June 2026, up by 14.17Mn shares quarter on quarter, and down 9.01Mn shares year over year.
BlackRock, Inc. is the top holder of Magnite as of June 30, 2026, with 12.71Mn shares representing 8.89% of outstanding stock.
The largest buyers of Magnite for the quarter ending June 2026 were FMR LLC (3.25Mn), CANADA PENSION PLAN INVESTMENT BOARD (2.95Mn), 325 CAPITAL LLC (1.41Mn), Park West Asset Management LLC (1.4Mn), Qube Research & Technologies Ltd (1.29Mn).
Leading sellers of Magnite shares for the quarter ending June 2026 were WELLINGTON MANAGEMENT GROUP LLP (3.15Mn), Capital Research Global Investors (1.15Mn), Schonfeld Strategic Advisors LLC (1.04Mn), BALYASNY ASSET MANAGEMENT L.P. (833.89K), Ophir Asset Management Pty Ltd (667.96K).
Per Business Quant data, the top 10 holders of Magnite for the quarter ending June 2026 are BlackRock, Inc. (12.71Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (8.2Mn), FMR LLC (7.76Mn), VANGUARD CAPITAL MANAGEMENT LLC (6.23Mn), WELLINGTON MANAGEMENT GROUP LLP (6.04Mn), DIMENSIONAL FUND ADVISORS LP (5.26Mn), Boston Partners (5.01Mn), AMERICAN CENTURY COMPANIES INC (4.62Mn), Capital Research Global Investors (3.87Mn), Nuveen, LLC (3.79Mn).

Form 13F Holdings

308 Institutional Holders

Report period 30 Jun, 2026

Total shares held 142.62Mn

Of outstanding 99.72%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	12,713,156	8.89%	▲1,055,660	+9.06%	$241.30Mn
2	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	8,197,286	5.73%	▲471,081	+6.10%	$155.58Mn
3	FMR LLC	0000315066	7,759,426	5.43%	▲3,252,007	+72.15%	$147.27Mn
4	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	6,225,195	4.35%	▲34,792	+0.56%	$118.15Mn
5	WELLINGTON MANAGEMENT GROUP LLP	0000902219	6,044,492	4.23%	▼3,146,585	-34.24%	$114.72Mn
6	DIMENSIONAL FUND ADVISORS LP	0000354204	5,260,132	3.68%	▲1,276,458	+32.04%	$99.84Mn
7	Boston Partners	0001386060	5,013,835	3.51%	▲293,972	+6.23%	$95.85Mn
8	AMERICAN CENTURY COMPANIES INC	0000748054	4,622,736	3.23%	▼4,080	-0.09%	$87.74Mn
9	Capital Research Global Investors	0001422848	3,869,159	2.71%	▼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	2.65%	▲236,169	+6.65%	$71.95Mn
12	Edenbrook Capital, LLC	0001666682	3,555,615	2.49%	▲757,579	+27.08%	$67.49Mn
13	State Street Corp	0000093751	3,528,075	2.47%	▲364,936	+11.54%	$66.96Mn
14	325 CAPITAL LLC	0001873893	3,412,694	2.39%	▲1,407,307	+70.18%	$64.77Mn
15	Nine Ten Capital Management LLC	0001635236	3,261,283	2.28%	▼220,000	-6.32%	$61.90Mn
16	Granahan Investment Management, LLC	0001026710	3,083,211	2.16%	▲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	1.54%	▲531,031	+31.83%	$41.74Mn
19	Park West Asset Management LLC	0001386928	2,000,000	1.40%	▲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