CSS LLC’s Insmed INSM Stock Holding History

CSS LLC’s Portfolio INSM Stock Details INSM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	–	Sell	-1,500	Closed	-$261K	–	1085
2025 Q4	$261K	Buy	+1,500	New	+$274K	0.01%	717
2019 Q3	–	Sell	-1,300	Closed	-$33K	–	713
2019 Q2	$33K	Sell	1,300 -20,000	-94%	-$557K	﹤0.01%	716
2019 Q1	$620K	Buy	21,300 +11,300	+113%	+$293K	0.04%	276
2018 Q4	$131K	Buy	+10,000	New	+$160K	0.01%	437

Other funds holding INSM

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

DGM

Darwin Global Management St. Helier, Jersey $3.77B AUM 307.72% 1-Year Est. Return

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

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

BBA

Baker Bros. Advisors New York $17.4B AUM 131.5% 1-Year Est. Return

Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

CSS LLC's INSM Position: Q3 2025 in Review

CSS LLC sold out of Insmed (INSM) in Q3 2025, closing a stake of 27,375 shares — an estimated $2.76M sold.

CSS LLC first reported a position in INSM in Q1 2020 and held it in 2 quarters. The position peaked at $2.76M in Q2 2025. 566 funds tracked by Wall St. Rank hold INSM as of Q3 2025.

CSS LLC reported no remaining Insmed position as of Q3 2025 after selling out during the quarter.
CSS LLC sold 27,375 Insmed shares in Q3 2025, an estimated $2.76M.
CSS LLC first reported a position in Insmed in Q1 2020 and held it in 2 quarters.
CSS LLC's Insmed position peaked at $2.76M in Q2 2025.
566 funds tracked by Wall St. Rank held Insmed as of Q3 2025.

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