Merus Ownership | Who Owns Merus?

Overview Forecast RevenueFinancials Chart

Merus Ownership Summary

Merus is owned by 0.08% institutional investors, 97.05% insiders, and 2.88% retail investors. Paradigm biocapital advisors lp is the largest institutional shareholder, holding 6.15% of MRUS shares. Vanguard Health Care Inv is the top mutual fund, with 2.27% of its assets in Merus shares.

MRUS Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Merus	0.08%	97.05%	2.88%
Sector	Healthcare Stocks	232.63%	10.66%	-143.29%
Industry	Biotech Stocks	382.12%	10.42%	-292.54%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Paradigm biocapital advisors lp	4.37M	6.15%	$411.79M
Avoro capital advisors	3.54M	4.98%	$333.53M
Commodore capital lp	3.52M	4.96%	$331.88M
Deerfield management company, l.p. (series c)	3.05M	4.29%	$286.87M
Hbk investments l p	2.85M	4.01%	$268.33M
Fmr	2.81M	3.95%	$264.65M
Boxer capital	1.90M	3.27%	$112.42M
Rtw investments, lp	2.03M	2.85%	$190.68M
Blackrock	1.53M	2.63%	$90.28M
Woodline partners lp	1.67M	2.35%	$157.62M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Lynx1 capital management lp	1.53M	29.40%	$144.44M
Commodore capital lp	3.52M	16.20%	$331.88M
Twin securities	310.26K	14.52%	$29.21M
Paradigm biocapital advisors lp	4.37M	11.71%	$411.79M
Kryger capital	1.05M	11.46%	$99.19M
Sand grove capital management llp	239.38K	11.01%	$22.54M
Allostery investments lp	9.00K	6.03%	$473.40K
Boxer capital	1.90M	5.92%	$112.42M
Harvest management	130.00K	5.29%	$12.24M
Dafna capital management	220.45K	5.13%	$20.76M

Top Buyers

Holder	Shares	% Assets	Change
Hbk investments l p	2.85M	2.94%	2.85M
Goldman sachs group	1.20M	0.01%	1.09M
Kryger capital	1.05M	11.46%	1.05M
Magnetar financial	1.05M	0.60%	1.05M
Pentwater capital management lp	970.00K	0.51%	970.00K

Top Sellers

Holder	Shares	% Assets	Change
Fmr	2.81M	0.01%	-4.68M
Wellington management group llp	459.09K	0.01%	-3.27M
Blackrock funding, inc. /de	-	-	-2.17M
Westfield capital management co lp	-	-	-2.13M
Holocene advisors, lp	166.74K	0.04%	-2.06M

New Positions

Holder	Shares	% Assets	Change	Value
Hbk investments l p	2.85M	2.94%	2.85M	$268.33M
Kryger capital	1.05M	11.46%	1.05M	$99.19M
Magnetar financial	1.05M	0.60%	1.05M	$98.41M
Pentwater capital management lp	970.00K	0.51%	970.00K	$91.33M
Tig advisors	868.14K	4.85%	868.14K	$81.74M

Sold Out

Holder	Change
Capital performance advisors llp	-4.00
Jpl wealth management	-5.00
Hexagon capital partners	-6.00
Twin tree management, lp	-6.00
True wealth design	-6.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	3	-98.96%	59,260	-99.91%	-	0.00%	1	-99.44%	-	-100.00%
Sep 30, 2025	64	-68.93%	5,321,999	-92.67%	7	0.07%	37	-69.17%	21	-66.67%
Jun 30, 2025	213	11.52%	74,790,427	8.39%	105	1.05%	121	26.04%	65	6.56%
Mar 31, 2025	194	-3.00%	70,836,485	0.66%	102	0.97%	97	-11.01%	63	18.87%
Dec 31, 2024	197	0.51%	69,971,572	1.37%	102	1.00%	107	2.88%	54	5.88%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Health Care Inv	1.69M	2.27%	-687.83K
Fidelity Select Health Care	1.16M	1.53%	-40.00K
HBM Healthcare Investments AG Ord	1.00M	1.34%	82.59K
Polar Capital Healthcare Opports Inc	948.58K	1.25%	-
Federated Hermes Kaufmann Small Cap A	825.00K	1.11%	117.71K
Federated Hermes Kaufmann Small Cap Grow	825.00K	1.09%	117.71K
Strategic Advisers Fidelity US TtlStk	745.89K	0.99%	-52.40K
Fidelity Select Biotechnology	708.85K	0.94%	-
Federated Hermes Kaufmann R	684.50K	0.92%	356.50K
Federated Hermes Kaufmann Growth	684.50K	0.91%	356.50K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Dec 29, 2025	GENMAB A/S	-	Sell	$7.36B
Dec 26, 2025	GENMAB A/S	-	Buy	$288.87K
Dec 29, 2025	GENMAB A/S	-	Buy	$102.12M
Dec 22, 2025	GENMAB A/S	-	Buy	$1.52M
Dec 26, 2025	GENMAB A/S	-	Buy	$13.83M

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	11	2
2025 Q3	-	2
2025 Q2	-	1
2025 Q1	-	2
2024 Q3	-	1

MRUS Ownership FAQ

Who Owns Merus?

Merus shareholders are primarily institutional investors at 0.08%, followed by 97.05% insiders and 2.87% retail investors. The average institutional ownership in Merus's industry, Biotech Stocks , is 382.12%, which Merus falls below.

Who owns the most shares of Merus?

Merus’s largest shareholders are Paradigm biocapital advisors lp (4.37M shares, 6.15%), Avoro capital advisors (3.54M shares, 4.98%), and Commodore capital lp (3.52M shares, 4.96%). Together, they hold 16.09% of Merus’s total shares outstanding.

Does Blackrock own Merus?

Yes, BlackRock owns 2.63% of Merus, totaling 1.53M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 90.28M$. In the last quarter, BlackRock increased its holdings by 57.82K shares, a 3.94% change.

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

Lynx1 capital management lp is Merus’s biggest shareholder by percentage of total assets invested, with 29.40% of its assets in 1.53M Merus shares, valued at 144.44M$.

Who is the top mutual fund holder of Merus shares?

Vanguard Health Care Inv is the top mutual fund holder of Merus shares, with 2.27% of its total shares outstanding invested in 1.69M Merus shares.

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