Merus Ownership | Who Owns Merus?

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Merus Ownership Summary

Merus is owned by 7.49% institutional investors, 2.28% insiders, and 90.23% 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	7.49%	2.28%	90.23%
Sector	Healthcare Stocks	42.54%	10.82%	46.64%
Industry	Biotech Stocks	45.21%	10.75%	44.04%

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
Blackrock funding, inc. /de	2.17M	3.06%	$204.50M
Westfield capital management co lp	2.13M	3.00%	$200.77M
Rtw investments, lp	2.03M	2.85%	$190.68M

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
First turn management	372.02K	5.26%	$35.03M

Top Buyers

Holder	Shares	% Assets	Change
Hbk investments l p	2.85M	2.94%	2.85M
Glazer capital	1.62M	5.12%	1.62M
Blackrock funding, inc. /de	2.17M	0.00%	1.12M
Goldman sachs group	1.20M	0.01%	1.09M
Kryger capital	1.05M	11.46%	1.05M

Top Sellers

Holder	Shares	% Assets	Change
Fmr	2.81M	0.01%	-4.68M
Wellington management group llp	459.09K	0.01%	-3.27M
Holocene advisors, lp	166.74K	0.04%	-2.06M
Rtw investments, lp	2.03M	2.35%	-1.98M
Polar capital	-	-	-1.61M

New Positions

Holder	Shares	% Assets	Change	Value
Hbk investments l p	2.85M	2.94%	2.85M	$268.33M
Glazer capital	1.62M	5.12%	1.62M	$152.46M
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

Sold Out

Holder	Change
Ifp advisors	-2.00
Capital performance advisors llp	-4.00
Allworth financial lp	-5.00
Hexagon capital partners	-6.00
Twin tree management, lp	-6.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Sep 30, 2024	195	4.84%	69,020,442	3.79%	101	0.77%	104	-15.45%	51	21.43%

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 17, 2025	GENMAB A/S	-	Buy	$14.63M
Dec 16, 2025	GENMAB A/S	-	Buy	$11.71M
Nov 26, 2025	Shuman Harry	VP Controller, PAO	Sell	$163.37K
Nov 25, 2025	Shuman Harry	VP Controller, PAO	Sell	$796.14K
Jul 17, 2025	Silverman Peter B.	COO & GC	Sell	$1.50M

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	2	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 7.49%, followed by 2.28% insiders and 90.23% retail investors. The average institutional ownership in Merus's industry, Biotech Stocks , is 45.21%, 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?

BlackRock is not among the top 10 institutional shareholders of Merus.

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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