NASDAQ: INSM
Insmed Inc Stock Ownership - Who owns Insmed?

Insider buying vs selling

Have Insmed Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Martina Md FlammerChief Medical Officer2026-05-1410,479$117.54
$1.23MSell
William LewisChair and CEO2026-05-1313,283$116.18
$1.54MSell
Martina Md FlammerChief Medical Officer2026-05-134,470$112.76
$504.04kSell
Sara BonsteinChief Financial Officer2026-05-138,272$116.18
$961.04kSell
Roger AdsettChief Operating Officer2026-05-135,837$116.18
$678.14kSell
Michael Alexander SmithChief Legal Officer2026-05-134,109$116.18
$477.38kSell
Martina Md FlammerChief Medical Officer2026-05-133,384$116.18
$393.15kSell
Martina Md FlammerChief Medical Officer2026-05-1112,119$100.35
$1.22MSell
Martina Md FlammerChief Medical Officer2026-05-1112,949$17.07
$221.04kBuy
Martina Md FlammerChief Medical Officer2026-05-11830$101.18
$83.98kSell

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Net Insider Buy/Sell (L12M) Ownership

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INSM Shareholders

What type of owners hold Insmed Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Jpmorgan Chase Co11.14%24,150,499$2.64BInstitution
Richard S. Kollender10.12%21,924,540$2.39BInsider
Darwin Global Management Ltd7.75%16,805,184$1.83BInstitution
Blackrock Inc7.69%16,678,146$1.82BInstitution
Fmr LLC6.07%13,160,167$1.44BInstitution
Vanguard Portfolio Management LLC4.79%10,371,802$1.13BInstitution
Vanguard Capital Management LLC4.45%9,642,131$1.05BInstitution
Baker Bros Advisors LP3.42%7,421,111$809.94MInstitution
Artisan Partners Limited Partnership3.01%6,527,301$712.39MInstitution
D E Shaw Co Inc2.60%5,625,825$614.00MInstitution

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INSM vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
INSM85.00%15.00%Net SellingNet Selling
UTHR86.60%13.40%Net SellingNet Selling
BNTX19.24%17.34%Net SellingNet Selling
ROIV43.60%56.40%Net SellingNet Selling
MRNA76.96%22.42%Net BuyingNet Selling

Insmed Stock Ownership FAQ

Who owns Insmed?

Insmed (NASDAQ: INSM) is owned by 98.60% institutional shareholders, 17.40% Insmed insiders, and 0.00% retail investors. Richard S. Kollender is the largest individual Insmed shareholder, owning 21.92M shares representing 10.12% of the company. Richard S. Kollender's Insmed shares are currently valued at $2.39B.

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