CM
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Castleark Management’s Insmed INSM Stock Holding History

Castleark 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
Q2 		$831K Hold
7,790
– – 0.02% 247
2026
Q1 		$1.27M Hold
7,790
– – 0.04% 214
2025
Q4 		$1.36M Buy
7,790
+2,060
+36% +$376K 0.04% 215
2025
Q3 		$825K Buy
5,730
+2,590
+82% +$317K 0.02% 229
2025
Q2 		$316K Sell
3,140
-50,720
-94% -$3.88M 0.01% 243
2025
Q1 		$4.11M Buy
53,860
+1,080
+2% +$82.6K 0.14% 140
2024
Q4 		$3.64M Buy
52,780
+9,480
+22% +$683K 0.13% 162
2024
Q3 		$3.16M Buy
43,300
+26,640
+160% +$1.97M 0.13% 147
2024
Q2 		$1.12M Buy
+16,660
New +$646K 0.05% 200
2022
Q4 		– Sell
-228,410
Closed -$4.92M – 302
2022
Q3 		$4.92M Buy
228,410
+64,060
+39% +$1.54M 0.27% 89
2022
Q2 		$3.24M Sell
164,350
-4,370
-3% -$91.6K 0.17% 127
2022
Q1 		$3.96M Buy
+168,720
New +$3.92M 0.17% 130
2021
Q2 		– Sell
-209,103
Closed -$7.12M – 344
2021
Q1 		$7.12M Buy
209,103
+4,835
+2% +$185K 0.26% 108
2020
Q4 		$6.8M Sell
204,268
-42,900
-17% -$1.57M 0.25% 109
2020
Q3 		$7.94M Buy
247,168
+44,593
+22% +$1.28M 0.31% 98
2020
Q2 		$5.58M Buy
+202,575
New +$4.8M 0.24% 113
2019
Q3 		– Sell
-284,297
Closed -$7.28M – 363
2019
Q2 		$7.28M Buy
284,297
+35,895
+14% +$1,000K 0.28% 122
2019
Q1 		$7.22M Buy
+248,402
New +$6.44M 0.27% 123

Other funds holding INSM

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
BBA
Baker Bros. Advisors New York $20B AUM 154.41% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return
DGM
Darwin Global Management St. Helier, Jersey $3.76B AUM 342.13% 1-Year Est. Return
Ameriprise
Ameriprise Minneapolis, Minnesota $495B AUM 43.24% 1-Year Est. Return
OAG
Orbis Allan Gray Hamilton, Bermuda $29.1B AUM 60.8% 1-Year Est. Return

Castleark Management's INSM Position: Q2 2026 in Review

Castleark Management held its Insmed (INSM) position steady in Q2 2026 at 7,790 shares worth $831K. The position accounts for 0.02% of the portfolio, ranked #247.

Castleark Management first reported a position in INSM in Q1 2019 and has held it in 18 quarters since. The position peaked at $7.94M in Q3 2020. 664 funds tracked by Wall St. Rank hold INSM as of Q2 2026.

  • Castleark Management held 7,790 shares of Insmed worth $831K as of Q2 2026.
  • Castleark Management left its Insmed share count unchanged in Q2 2026.
  • Insmed made up 0.02% of Castleark Management's portfolio in Q2 2026, its #247 holding.
  • Castleark Management first reported a position in Insmed in Q1 2019 and has held it in 18 quarters since.
  • Castleark Management's Insmed position peaked at $7.94M in Q3 2020.
  • 664 funds tracked by Wall St. Rank held Insmed as of Q2 2026.

Based on Castleark Management's 13F filing for Q2 2026, filed 14 Aug 2026.