Magnite Ownership | Who Owns Magnite?

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Magnite Ownership Summary

Magnite is owned by 99.55% institutional investors, 1.22% insiders. Vanguard group is the largest institutional shareholder, holding 10.35% of MGNI shares. Lord Abbett Floating Rate I is the top mutual fund, with 6.55% of its assets in Magnite shares.

MGNI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Magnite	99.55%	1.22%	-0.76%
Sector	Communication Services Stocks	43.28%	17.96%	38.76%
Industry	Advertising Stocks	36.21%	17.76%	46.04%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	14.80M	10.35%	$240.25M
Blackrock funding, inc. /de	12.71M	8.86%	$241.30M
Blackrock	9.70M	6.96%	$128.91M
Fmr	7.76M	5.41%	$147.27M
Vanguard capital management	6.23M	4.34%	$118.15M
Wellington management group llp	6.04M	4.21%	$114.72M
Dimensional fund advisors lp	5.26M	3.66%	$99.84M
Boston partners	5.01M	3.49%	$95.85M
American century companies	4.62M	3.22%	$87.74M
Nuveen asset management	3.94M	2.79%	$62.77M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Nine ten capital management	3.26M	19.26%	$61.90M
Grizzlyrock capital	1.16M	15.46%	$22.10M
325 capital	3.41M	15.44%	$64.77M
Edenbrook capital	3.56M	13.60%	$67.49M
Roumell asset management	387.77K	9.67%	$5.15M
Kopion asset management	674.45K	8.09%	$12.80M
Maestria partners	1.16M	7.65%	$21.99M
Norwood investment partners, lp	235.00K	6.16%	$4.46M
Meros investment management, lp	991.34K	5.97%	$18.82M
Evr research lp	480.00K	4.50%	$9.11M

Top Buyers

Holder	Shares	% Assets	Change
Fmr	7.76M	0.01%	3.25M
Canada pension plan investment board	3.00M	0.03%	2.95M
325 capital	3.41M	15.44%	1.41M
Park west asset management	2.00M	2.59%	1.40M
Qube research	1.96M	0.03%	1.29M

Top Sellers

Holder	Shares	% Assets	Change
Wellington management group llp	6.04M	0.02%	-3.15M
Burgundy asset management	-	-	-2.46M
No street gp lp	-	-	-1.63M
Driehaus capital management	1.52M	0.24%	-1.27M
Capital research global investors	3.87M	0.01%	-1.15M

New Positions

Holder	Shares	% Assets	Change	Value
Sixth street partners management company	1.20M	0.00%	1.20M	$22.84M
T. rowe price investment management	890.92K	0.01%	890.92K	$19.41M
Ameriprise financial	619.57K	0.00%	619.57K	$11.76M
Evr research lp	480.00K	4.50%	480.00K	$9.11M
Jump financial	428.04K	0.07%	428.04K	$8.12M

Sold Out

Holder	Change
Kilter group	-1.00
Tfc financial management	-1.00
Innealta capital	-4.00
Toronto dominion bank	-7.00
Wealthspire advisors	-8.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	329	4.78%	142,893,125	8.61%	99	1.17%	175	6.71%	88	6.02%
Mar 31, 2026	309	-6.65%	131,062,018	-4.12%	91	1.01%	160	-12.09%	82	-9.89%
Dec 31, 2025	238	-31.81%	91,409,658	-33.77%	63	0.67%	128	-16.34%	68	-46.46%
Sep 30, 2025	259	-17.25%	120,992,241	-17.67%	85	0.79%	107	-31.85%	110	12.24%
Jun 30, 2025	311	-0.64%	146,863,904	11.40%	103	1.20%	158	0.64%	97	-

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Lord Abbett Floating Rate I	9.38M	6.55%	9.38M
Vanguard MStar Total Stk Mkt Idx Invest	4.34M	3.02%	-7.96K
Vanguard Total Stock Mkt Idx Inv	4.33M	3.02%	-40.95K
Vanguard Morn Total Stk Mkt Idx Investor	4.33M	3.02%	-40.95K
Vanguard US Total Market Shares ETF	4.16M	2.91%	4.24K
iShares Russell 2000 ETF	3.79M	2.64%	32.40K
American Funds SMALLCAP World A	3.77M	2.63%	-1.13M
Vanguard Small Cap Index	3.13M	2.18%	1.96K
American Century U.S. Small Cap Growth	2.94M	2.06%	37.83K
American Century Small Cap Growth Inv	2.94M	2.06%	37.83K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 17, 2026	Caine Paul	-	Sell	$198.75K
Sep 17, 2026	Knopper Douglas S	-	Sell	$981.22K
Sep 14, 2026	Buonasera David	CHIEF TECHNOLOGY OFFICER	Sell	$27.96K
Sep 14, 2026	Spillane Robert F	-	Sell	$246.22K
Sep 11, 2026	Evans Katie Seitz	See Remarks	Sell	$335.93K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	32
2026 Q2	-	11
2026 Q1	-	1
2025 Q4	-	6
2025 Q3	-	32

MGNI Ownership FAQ

Who Owns Magnite?

Magnite shareholders are primarily institutional investors at 99.55%, followed by 1.22% insiders and -0.77% retail investors. The average institutional ownership in Magnite's industry, Advertising Stocks , is 36.21%, which Magnite exceeds.

Who owns the most shares of Magnite?

Magnite’s largest shareholders are Vanguard group (14.8M shares, 10.35%), Blackrock funding, inc. /de (12.71M shares, 8.86%), and Blackrock (9.7M shares, 6.96%). Together, they hold 26.17% of Magnite’s total shares outstanding.

Does Blackrock own Magnite?

Yes, BlackRock owns 6.96% of Magnite, totaling 9.7M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 128.91M$. In the last quarter, BlackRock decreased its holdings by -80.477K shares, a -0.82% change.

Who is Magnite’s biggest shareholder by percentage of total assets invested?

Nine ten capital management is Magnite’s biggest shareholder by percentage of total assets invested, with 19.26% of its assets in 3.26M Magnite shares, valued at 61.9M$.

Who is the top mutual fund holder of Magnite shares?

Lord Abbett Floating Rate I is the top mutual fund holder of Magnite shares, with 6.55% of its total shares outstanding invested in 9.38M Magnite shares.

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