Magnite Ownership | Who Owns Magnite?

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Magnite Ownership Summary

Magnite is owned by 93.47% institutional investors, 1.55% insiders, and 4.99% retail investors. Vanguard group is the largest institutional shareholder, holding 9.63% of MGNI shares. American Funds SMALLCAP World A is the top mutual fund, with 7.97% of its assets in Magnite shares.

MGNI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Magnite	93.47%	1.55%	4.99%
Sector	Communication Services Stocks	14945.80%	16.08%	-14861.87%
Industry	Advertising Stocks	31.62%	13.64%	54.74%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	13.61M	9.63%	$216.59M
Blackrock funding, inc. /de	10.17M	7.20%	$161.86M
Blackrock	9.70M	6.96%	$128.91M
Capital research global investors	7.73M	5.47%	$122.99M
Wellington management group llp	7.03M	4.98%	$111.92M
Dimensional fund advisors lp	5.52M	3.91%	$87.96M
Granahan investment management	5.23M	3.75%	$69.51M
Nuveen asset management	3.94M	2.79%	$62.77M
State street	3.12M	2.24%	$41.48M
Nine ten capital management	3.12M	2.21%	$49.60M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Grizzlyrock capital	863.54K	14.36%	$13.75M
Nine ten capital management	3.12M	14.16%	$49.60M
Edenbrook capital	3.10M	13.94%	$49.41M
Roumell asset management	387.77K	9.67%	$5.15M
Kopion asset management	641.51K	7.17%	$10.21M
Meros investment management, lp	927.41K	6.61%	$14.76M
P.a.w. capital	195.00K	5.92%	$3.10M
S squared	561.62K	3.71%	$8.94M
Granahan investment management	5.23M	2.78%	$69.51M
Millrace asset group	213.69K	2.76%	$2.84M

Top Buyers

Holder	Shares	% Assets	Change
Capital research global investors	7.73M	0.03%	7.73M
Boston partners	2.11M	0.04%	2.11M
Ubs group	1.69M	0.01%	1.45M
Driehaus capital management	747.76K	0.10%	747.76K
Centerbook partners lp	625.76K	0.60%	625.76K

Top Sellers

Holder	Shares	% Assets	Change
Marshall wace, llp	796.99K	0.02%	-2.85M
Burgundy asset management	-	-	-2.46M
Fmr	1.61M	0.00%	-2.15M
Elequin securities	-	-	-1.00M
Jane street group	11.61K	-	-836.60K

New Positions

Holder	Shares	% Assets	Change	Value
Capital research global investors	7.73M	0.03%	7.73M	$122.99M
Boston partners	2.11M	0.04%	2.11M	$28.29M
Driehaus capital management	747.76K	0.10%	747.76K	$9.94M
Centerbook partners lp	625.76K	0.60%	625.76K	$9.96M
Raymond james financial	545.56K	0.00%	545.56K	$8.68M

Sold Out

Holder	Change
Innealta capital	-4.00
Toronto dominion bank	-7.00
1832 asset management	-10.00
Synergy asset management	-17.00
Creekmur asset management	-38.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2024	247	6.93%	102,315,440	-0.27%	74	1.33%	119	25.26%	68	-5.56%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
American Funds SMALLCAP World A	11.39M	7.97%	4.47M
Vanguard Total Stock Mkt Idx Inv	4.40M	3.11%	177.77K
Vanguard US Total Market Shares ETF	4.16M	2.91%	4.24K
Vanguard Small Cap Index	3.41M	2.41%	23.84K
iShares Russell 2000 ETF	3.22M	2.28%	1.58K
Fidelity Advisor Growth Opps M	2.18M	1.55%	-703.50K
American Century Small Cap Growth Inv	2.06M	1.44%	2.06M
American Century U.S. Small Cap Growth	2.06M	1.44%	2.06M
Vanguard Institutional Extnd Mkt Idx Tr	1.95M	1.38%	2.39K
Vanguard Small Cap Growth Index Inv	1.90M	1.34%	2.82K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jun 04, 2025	Saltz Aaron	CHIEF LEGAL OFFICER	Sell	$256.13K
Jun 05, 2025	Evans Katie Seitz	President, Operations	Sell	$607.60K
Jun 06, 2025	Soroca Adam Lee	CHIEF PRODUCT OFFICER	Sell	$147.41K
Jun 06, 2025	PEARSON DAVID T.	-	Sell	$202.61K
May 23, 2025	Buonasera David	CHIEF TECHNOLOGY OFFICER	Sell	$54.90K

Insider Transactions Trends

Date	Buy	Sell
2025 Q2	-	10
2025 Q1	-	11
2024 Q4	-	22
2024 Q3	-	10
2024 Q2	-	13

MGNI Ownership FAQ

Who Owns Magnite?

Magnite shareholders are primarily institutional investors at 93.47%, followed by 1.55% insiders and 4.98% retail investors. The average institutional ownership in Magnite's industry, Advertising Stocks , is 31.62%, which Magnite exceeds.

Who owns the most shares of Magnite?

Magnite’s largest shareholders are Vanguard group (13.61M shares, 9.63%), Blackrock funding, inc. /de (10.17M shares, 7.20%), and Blackrock (9.7M shares, 6.96%). Together, they hold 23.79% 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?

Grizzlyrock capital is Magnite’s biggest shareholder by percentage of total assets invested, with 14.36% of its assets in 863.54K Magnite shares, valued at 13.75M$.

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 7.97% of its total shares outstanding invested in 11.39M Magnite shares.

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