Magnite Ownership | Who Owns Magnite?

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Magnite Ownership Summary

Magnite is owned by 103.68% institutional investors, 1.14% insiders. Vanguard group is the largest institutional shareholder, holding 9.63% 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	103.68%	1.14%	-4.82%
Sector	Communication Services Stocks	46.33%	16.23%	37.44%
Industry	Advertising Stocks	46.36%	15.23%	38.41%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	13.61M	9.63%	$216.59M
Capital research global investors	12.92M	9.12%	$311.63M
Blackrock funding, inc. /de	10.70M	7.55%	$258.04M
Blackrock	9.70M	6.96%	$128.91M
Wellington management group llp	7.03M	4.98%	$111.92M
Dimensional fund advisors lp	5.52M	3.91%	$87.96M
American century companies	4.83M	3.41%	$116.48M
Nuveen asset management	3.94M	2.79%	$62.77M
Granahan investment management	3.64M	2.57%	$87.86M
Edenbrook capital	3.61M	2.55%	$87.07M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Edenbrook capital	3.61M	18.71%	$87.07M
Grizzlyrock capital	863.54K	14.36%	$13.75M
Nine ten capital management	3.12M	14.16%	$49.60M
Roumell asset management	387.77K	9.67%	$5.15M
Apis capital advisors	1.05M	8.98%	$25.28M
Norwood investment partners, lp	462.00K	8.35%	$11.14M
Meros investment management, lp	927.41K	6.61%	$14.76M
P.a.w. capital	195.00K	5.92%	$3.10M
1492 capital management	321.92K	3.58%	$7.76M
Granahan investment management	3.64M	3.58%	$87.86M

Top Buyers

Holder	Shares	% Assets	Change
Boston partners	2.11M	0.04%	2.11M
American century companies	4.83M	0.06%	1.87M
Ubs group	1.69M	0.01%	1.45M
Frontier capital management	1.79M	0.40%	1.45M
Apis capital advisors	1.05M	8.98%	1.05M

Top Sellers

Holder	Shares	% Assets	Change
Burgundy asset management	-	-	-2.46M
Fmr	1.61M	0.00%	-2.15M
Qube research	-	-	-1.04M
Elequin securities	-	-	-1.00M
Jane street group	11.61K	-	-836.60K

New Positions

Holder	Shares	% Assets	Change	Value
Boston partners	2.11M	0.04%	2.11M	$28.29M
Apis capital advisors	1.05M	8.98%	1.05M	$25.28M
Balyasny asset management	699.93K	0.03%	699.93K	$16.88M
Centerbook partners lp	625.76K	0.60%	625.76K	$9.96M
J. goldman & co lp	603.68K	0.35%	603.68K	$14.56M

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 %
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%
Jun 30, 2024	285	15.38%	103,855,108	1.50%	74	1.36%	171	43.70%	63	-7.35%

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
Oct 24, 2025	Caine Paul	-	Sell	$100.00K
Sep 19, 2025	Caine Paul	-	Sell	$187.50K
Sep 19, 2025	Saltz Aaron	CHIEF LEGAL OFFICER	Sell	$208.79K
Sep 15, 2025	Saltz Aaron	CHIEF LEGAL OFFICER	Sell	$147.95K
Sep 10, 2025	Caine Paul	-	Sell	$28.43K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	32
2025 Q2	-	27
2025 Q1	-	11
2024 Q4	-	22
2024 Q3	-	10

MGNI Ownership FAQ

Who Owns Magnite?

Magnite shareholders are primarily institutional investors at 103.68%, followed by 1.14% insiders and -4.82% retail investors. The average institutional ownership in Magnite's industry, Advertising Stocks , is 46.36%, which Magnite exceeds.

Who owns the most shares of Magnite?

Magnite’s largest shareholders are Vanguard group (13.61M shares, 9.63%), Capital research global investors (12.92M shares, 9.12%), and Blackrock funding, inc. /de (10.7M shares, 7.55%). Together, they hold 26.30% 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?

Edenbrook capital is Magnite’s biggest shareholder by percentage of total assets invested, with 18.71% of its assets in 3.61M Magnite shares, valued at 87.07M$.

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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