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INSM — INSMED INC

Reported value held$12.44B
Funds holding (latest)54
SectorHealth Care
Funds holding (Q2 2026)42
Institutional value$8.25B · 80.84M sh
New / Add / Cut / Exit3 / 23 / 16 / 3
Top-5 / Top-10 concentration58.7% / 75.8%
Institutional holdings change Accumulating +15.4% (+10.76M sh)
Institutional value change Down -24.7%

As of Q2 2026, 42 SEC-registered investment managers reported holding INSM (INSMED INC) in their latest 13F filings, with a combined reported value of $8.25B across 80.84M shares. That is +15.4% by share count (+10.76M shares) versus the previous quarter, while reported value moved -24.7%. Ownership is concentrated: the five largest holders account for 58.7% of reported value and the top ten for 75.8%.

Compared with the prior quarter, 3 opened new positions, 23 added to existing stakes, 16 trimmed, 3 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.

INSM is classified in the Health Care sector.

All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.

FundQuarterSharesValuePortfolio WeightChange
Vanguard Group history Q4 2025 21.08M $3.67B 0.05% Add
Fidelity Management & Research (FMR) history Q2 2026 16.14M $1.72B 0.08% Add
BlackRock Inc history Q2 2026 15.81M $1.69B 0.03% Reduce
D. E. Shaw & Co history Q2 2026 5.94M $633.12M 0.33% Add
Geode Capital Management history Q2 2026 4.22M $448.76M 0.02% Reduce
Norges Bank Investment Management history Q2 2026 3.38M $360.12M 0.04% Add
Citadel Advisors history Q2 2026 3.19M $339.89M 0.04% Add
Millennium Management history Q2 2026 2.93M $312.21M 0.12% Add
UBS Group AG history Q2 2026 2.59M $275.77M 0.04% Add
Franklin Resources history Q2 2026 2.27M $242.37M 0.06% Reduce
Goldman Sachs Group history Q2 2026 2.26M $241.13M 0.02% Add
Maverick Capital history Q2 2026 2.15M $229.31M 2.07% New
Capital World Investors history Q1 2026 1.36M $222.74M 0.03% New
Balyasny Asset Management history Q2 2026 1.34M $143.20M 0.19% Add
Northern Trust Corp history Q2 2026 1.32M $140.24M 0.02% Add
BNY Mellon history Q2 2026 1.31M $139.97M 0.02% Add
Two Sigma Investments history Q2 2026 1.25M $133.30M 0.10% Add
Morgan Stanley history Q2 2026 1.23M $131.52M 0.01% Reduce
Charles Schwab Investment Management history Q2 2026 1.21M $129.43M 0.02% Add
Bank of America Corp history Q2 2026 1.02M $109.08M 0.01% Reduce

View all 54 fund holders →

New Positions (Q2 2026)

Fully Exited (vs previous quarter)

Fund Position History — shares by quarter (top 20 funds)

FundQ3 2021Q4 2021Q1 2022Q2 2022Q3 2022Q4 2022Q1 2023Q2 2023Q3 2023Q4 2023Q1 2024Q2 2024Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
Fidelity Management & Research (FMR) 400.00K 400.00K 400.00K 400.00K 3.75M 3.75M 3.75M 3.75M 6.25M 6.25M 6.25M 5.85M 11.56M 11.98M 12.84M 5.09M 9.18M 9.93M 13.16M 16.14M
BlackRock Inc — — — — — — — — — — — — 4.60M 5.95M 5.95M 11.14M 12.36M 15.07M 16.68M 15.81M
D. E. Shaw & Co 363.98K 303.73K 295.99K 374.65K 636.99K 427.28K 237.37K 98.90K 2.50M 646.91K 174.02K 288.55K 76.73K 518.79K 744.88K 3.43M 5.73M 4.36M 5.64M 5.94M
Geode Capital Management 2.01M 2.06M 2.12M 2.10M 2.14M 2.50M 2.63M 2.70M 2.87M 3.07M 3.16M 3.64M 3.81M 4.09M 4.29M 3.34M 3.76M 4.30M 4.45M 4.22M
Norges Bank Investment Management — — — — — 1.34M — — — 1.45M — 1.76M — 1.83M — 1.93M — 2.91M — 3.38M
Citadel Advisors 27.30K 500.00K 178.09K 281.50K 404.92K 581.29K 1.08M 452.39K 2.00M 27.85M 1.13M 15.76M 697.46K 669.24K 520.91K 1.74M 2.59M 1.81M 2.61M 3.19M
Millennium Management — 42.33K 52.67K 239.08K 920.08K — 247.99K 90.86K 2.17M 1.61M 321.32K 2.50M 14.00M 14.00M 14.00M 2.13M 2.34M 1.31M 1.30M 2.93M
UBS Group AG 8.00K 8.00K 8.00K 2.00K 44.45K 306.90K 172.71K 168.84K 122.20K 300.18K 381.06K 1.00K 1.00K 1.00K 1.00K 383.45K 1.73M 1.95M 1.74M 2.59M
Franklin Resources 60.00M 60.00M 60.00M 60.00M 60.00M 60.00M 60.00M 60.00M 60.00M 60.00M 63.86M 41.86M 29.22M 27.50M 27.50M 2.35M 2.14M 2.76M 2.62M 2.27M
Goldman Sachs Group 242.19K 463.33K 556.98K 468.50K 871.18K 1.03M 16.00K 793.68K 863.52K 761.77K 753.61K 1.19M 1.39M 1.76M 1.40M 2.15M 959.32K 1.30M 942.65K 2.26M
Maverick Capital — — — — — — — — — — — — — — 425.12K 804.13K 656.54K — — 2.15M
Balyasny Asset Management — — — 493.33K 209.03K 382.65K — 994.06K 613.38K 32.44M 983.49K 160.75K 20.82K 183.97K — 150.00K 63.38K 392.26K 232.61K 1.34M
Northern Trust Corp 1.20M 1.22M 1.18M 1.16M 1.16M 1.30M 1.30M 1.32M 1.35M 1.37M 1.34M 1.39M 1.46M 1.75M 1.68M 969.80K 1.07M 1.24M 1.29M 1.32M
BNY Mellon 500.00K 300.00K 500.00K 200.00K 200.00K 200.00K 200.00K 400.00K 400.00K 400.00K 400.00K 200.00K 200.00K 100.00K 100.00K 1.20M 1.14M 1.39M 1.26M 1.31M
Two Sigma Investments 335.21K 27.50K 27.80K — 296.62K 455.04K 456.72K 488.77K 594.16K 352.61K 460.17K 107.74K 801.14K 594.00K 406.90K 376.51K 772.78K 962.16K 237.02K 1.25M
Morgan Stanley 3.52M 5.94M 5.04M 4.74M 2.11M 2.80M 2.82M 4.33M 4.94M 7.18M 40.00K 5.02M 310.00K 705.00K 435.00K 1.04M 963.63K 1.63M 1.33M 1.23M
Charles Schwab Investment Management 828.95K 849.57K 859.71K 850.66K 870.23K 1.01M 1.01M 1.01M 1.10M 1.13M 1.13M 1.31M 1.44M 1.55M 1.60M 1.30M 975.28K 1.03M 1.07M 1.21M
Bank of America Corp 5.54M 1.00K 1.00K 3.00K 1.00K 1.00K 22.00K 156.00K 1.82M 6.00K 996.13K 200.00K 2.57M 903.60K 694.60K 1.25M 2.02M 1.73M 1.50M 1.02M
Fidelity International (FIL) — — — — 12.72K 296.21K 439.52K 356.40K 831.20K 691.43K 720.25K 1.52M 2.44M 2.64M 2.39M 1.17M 851.95K 838.51K 828.95K 856.21K
Principal Global Investors 757.51K 782.60K 802.14K 1.04M 1.33M 1.30M 1.25M 1.26M 1.29M 1.36M 1.44M 1.66M 1.87M 1.82M 1.76M 1.35M 864.29K 771.36K 916.46K 856.13K

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