Atika Capital Management’s Insmed INSM Stock Holding History

Atika Capital Management’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	-77,200	Closed	-$13.4M	–	77
2025 Q4	$13.4M	Sell	77,200 -17,800	-19%	-$3.25M	1.41%	19
2025 Q3	$13.7M	Buy	+95,000	New	+$11.6M	1.1%	31
2025 Q2	–	Sell	-96,000	Closed	-$7.32M	–	68
2025 Q1	$7.32M	Buy	+96,000	New	+$7.34M	1.03%	31
2024 Q4	–	Sell	-62,000	Closed	-$4.53M	–	99
2024 Q3	$4.53M	Buy	62,000 +26,000	+72%	+$1.92M	0.46%	64
2024 Q2	$2.41M	Buy	+36,000	New	+$1.4M	0.24%	80

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

Atika Capital Management's INSM Position: Q1 2026 in Review

Atika Capital Management sold out of Insmed (INSM) in Q1 2026, closing a stake of 77,200 shares — an estimated $13.4M sold.

Atika Capital Management first reported a position in INSM in Q2 2024 and held it in 5 quarters. The position peaked at $13.7M in Q3 2025. 669 funds tracked by Wall St. Rank hold INSM as of Q1 2026.

Atika Capital Management reported no remaining Insmed position as of Q1 2026 after selling out during the quarter.
Atika Capital Management sold 77,200 Insmed shares in Q1 2026, an estimated $13.4M.
Atika Capital Management first reported a position in Insmed in Q2 2024 and held it in 5 quarters.
Atika Capital Management's Insmed position peaked at $13.7M in Q3 2025.
669 funds tracked by Wall St. Rank held Insmed as of Q1 2026.

Based on Atika Capital Management's 13F filing for Q1 2026, filed 14 May 2026.