Siren LLC’s Merus MRUS Stock Holding History

Siren LLC’s Portfolio MRUS Stock Details MRUS Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q3	–	Sell	-853,467	Closed	-$44.9M	–	123
2025 Q2	$44.9M	Sell	853,467 -190,000	-18%	-$8.93M	2.32%	9
2025 Q1	$43.9M	Buy	1,043,467 +259,055	+33%	+$11.3M	2.48%	10
2024 Q4	$33M	Buy	784,412 +102,211	+15%	+$4.91M	1.46%	19
2024 Q3	$34.1M	Buy	+682,201	New	+$35.6M	1.7%	22

Other funds holding MRUS

PBA

Paradigm Biocapital Advisors New York $4.89B AUM 251.12% 1-Year Est. Return

ACA

Avoro Capital Advisors New York $10.2B AUM 149.19% 1-Year Est. Return

Commodore Capital New York $1.73B AUM 298.96% 1-Year Est. Return

Deerfield Management New York $8.48B AUM 99.04% 1-Year Est. Return

HBK Investments Dallas, Texas $9.85B AUM 55.6% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Westfield Capital Management Boston, Massachusetts $23.8B AUM 49.45% 1-Year Est. Return

RTW Investments New York $10B AUM 135.35% 1-Year Est. Return

Woodline Partners San Francisco, California $26.4B AUM 44.85% 1-Year Est. Return

Siren LLC's MRUS Position: Q3 2025 in Review

Siren LLC sold out of Merus (MRUS) in Q3 2025, closing a stake of 853,467 shares — an estimated $44.9M sold.

Siren LLC first reported a position in MRUS in Q3 2024 and held it in 4 quarters. The position peaked at $44.9M in Q2 2025. 268 funds tracked by Wall St. Rank hold MRUS as of Q3 2025.

Siren LLC reported no remaining Merus position as of Q3 2025 after selling out during the quarter.
Siren LLC sold 853,467 Merus shares in Q3 2025, an estimated $44.9M.
Siren LLC first reported a position in Merus in Q3 2024 and held it in 4 quarters.
Siren LLC's Merus position peaked at $44.9M in Q2 2025.
268 funds tracked by Wall St. Rank held Merus as of Q3 2025.

Based on Siren LLC's 13F filing for Q3 2025, filed 13 Nov 2025.