Magnite Ownership | Who Owns Magnite?

Overview Forecast RevenueFinancials Chart Transcripts

Magnite Ownership Summary

Magnite is owned by 85.41% institutional investors, 1.37% insiders, and 13.22% retail investors. Fmr is the largest institutional shareholder, holding 12.10% of MGNI shares. American Funds SMALLCAP World A is the top mutual fund, with 8.07% of its assets in Magnite shares.

MGNI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Magnite	85.41%	1.37%	13.22%
Sector	Communication Services Stocks	31.39%	16.65%	51.96%
Industry	Advertising Stocks	39.66%	14.60%	45.74%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Fmr	17.14M	12.10%	$373.33M
Vanguard group	14.65M	10.35%	$319.17M
Blackrock funding, inc. /de	11.41M	8.06%	$248.58M
Blackrock	9.70M	6.96%	$128.91M
Capital research global investors	6.98M	4.93%	$152.09M
Wellington management group llp	5.14M	3.63%	$112.05M
American century companies	4.59M	3.24%	$100.06M
Boston partners	4.45M	3.14%	$95.21M
Nuveen asset management	3.94M	2.79%	$62.77M
Granahan investment management	3.87M	2.73%	$84.36M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Nine ten capital management	2.86M	16.05%	$62.26M
Roumell asset management	387.77K	9.67%	$5.15M
Norwood investment partners, lp	430.00K	8.05%	$9.37M
Maestria partners	1.14M	7.86%	$24.85M
Edenbrook capital	2.11M	7.85%	$45.96M
Grizzlyrock capital	390.91K	6.61%	$8.51M
Meros investment management, lp	613.83K	5.71%	$13.37M
325 capital	650.06K	4.30%	$14.16M
Apis capital advisors	839.40K	4.04%	$18.28M
Blue grotto capital	1.55M	3.91%	$33.73M

Top Buyers

Holder	Shares	% Assets	Change
Price t rowe associates inc /md/	2.55M	0.01%	2.43M
Blue grotto capital	1.55M	3.91%	1.26M
Vanguard group	14.65M	0.00%	1.09M
T. rowe price investment management	890.92K	0.01%	890.92K
Morgan stanley	2.05M	0.00%	875.68K

Top Sellers

Holder	Shares	% Assets	Change
Capital research global investors	6.98M	0.03%	-5.94M
Burgundy asset management	-	-	-2.46M
Schonfeld strategic advisors	-	-	-1.90M
Edenbrook capital	2.11M	7.85%	-1.50M
Dimensional fund advisors lp	3.57M	0.02%	-1.33M

New Positions

Holder	Shares	% Assets	Change	Value
T. rowe price investment management	890.92K	0.01%	890.92K	$19.41M
Balyasny asset management	699.93K	0.03%	699.93K	$16.88M
325 capital	650.06K	4.30%	650.06K	$14.16M
Tudor investment corp et al	449.11K	0.02%	449.11K	$9.78M
Norges bank	398.64K	0.00%	398.64K	$6.35M

Sold Out

Holder	Change
Tfc financial management	-1.00
Innealta capital	-4.00
Ifp advisors	-6.00
Toronto dominion bank	-7.00
1832 asset management	-10.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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	-
Mar 31, 2025	312	0.97%	132,582,786	7.47%	93	1.23%	156	4.00%	96	2.13%
Dec 31, 2024	282	-7.84%	106,517,130	-10.57%	75	1.06%	137	-8.67%	86	10.26%
Sep 30, 2024	303	5.21%	119,061,080	14.13%	84	1.53%	148	-14.94%	77	22.22%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
American Funds SMALLCAP World A	11.39M	8.07%	-
Vanguard US Total Market Shares ETF	4.16M	2.91%	4.24K
Vanguard Total Stock Mkt Idx Inv	4.13M	2.90%	-88.40K
iShares Russell 2000 ETF	3.38M	2.38%	-
Vanguard Small Cap Index	3.25M	2.28%	-21.74K
American Century Small Cap Growth Inv	3.01M	2.13%	946.69K
American Century U.S. Small Cap Growth	3.01M	2.13%	946.69K
Fidelity Balanced	2.90M	2.04%	-818.00
Strategic Advisers Fidelity US TtlStk	2.85M	2.00%	391.61K
Fidelity Advisor Growth Opps M	2.18M	1.55%	-703.50K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 24, 2025	Buckley Sean Patrick	President, Revenue	Sell	$32.09K
Nov 21, 2025	Spillane Robert F	-	Sell	$177.75K
Nov 18, 2025	Buckley Sean Patrick	President, Revenue	Sell	$59.13K
Nov 18, 2025	Soroca Adam Lee	CHIEF PRODUCT OFFICER	Sell	$143.64K
Oct 24, 2025	Caine Paul	-	Sell	$100.00K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	5
2025 Q3	-	32
2025 Q2	-	27
2025 Q1	-	11
2024 Q4	-	22

MGNI Ownership FAQ

Who Owns Magnite?

Magnite shareholders are primarily institutional investors at 85.41%, followed by 1.37% insiders and 13.22% retail investors. The average institutional ownership in Magnite's industry, Advertising Stocks , is 39.66%, which Magnite exceeds.

Who owns the most shares of Magnite?

Magnite’s largest shareholders are Fmr (17.14M shares, 12.10%), Vanguard group (14.65M shares, 10.35%), and Blackrock funding, inc. /de (11.41M shares, 8.06%). Together, they hold 30.50% 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 16.05% of its assets in 2.86M Magnite shares, valued at 62.26M$.

Who is the top mutual fund holder of Magnite shares?

American Funds SMALLCAP World A is the top mutual fund holder of Magnite shares, with 8.07% of its total shares outstanding invested in 11.39M Magnite shares.

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