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

Insider buying vs selling

Have Insmed Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
William LewisChair and CEO2026-03-053,899$146.66
$571.83kSell
William LewisChair and CEO2026-03-056,259$30.46
$190.65kBuy
William LewisChair and CEO2026-03-054,440$17.16
$76.19kBuy
William LewisChair and CEO2026-03-052,083$144.23
$300.43kSell
William LewisChair and CEO2026-03-052,128$147.54
$313.97kSell
William LewisChair and CEO2026-03-052,589$145.27
$376.10kSell
Michael Alexander SmithChief Legal Officer2026-02-244,151$155.06
$643.65kSell
Michael Alexander SmithChief Legal Officer2026-02-2415,771$156.53
$2.47MSell
Michael Alexander SmithChief Legal Officer2026-02-2420,248$17.07
$345.63kBuy
Michael Alexander SmithChief Legal Officer2026-02-244,852$153.93
$746.87kSell

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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 Co10.76%23,199,512$3.25BInstitution
Richard S. Kollender10.17%21,924,540$3.07BInsider
Vanguard Group Inc9.78%21,076,344$2.95BInstitution
Darwin Global Management Ltd9.71%20,933,277$2.93BInstitution
Blackrock Inc6.99%15,065,052$2.11BInstitution
Fmr LLC4.61%9,927,936$1.39BInstitution
Baker Bros Advisors LP3.06%6,592,746$923.84MInstitution
State Street Corp2.41%5,201,744$728.92MInstitution
Capital International Investors2.39%5,151,671$721.90MInstitution
Artisan Partners Limited Partnership2.25%4,843,749$678.75MInstitution

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INSM vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
INSM85.03%14.97%Net SellingNet Selling
ONC2.35%31.97%Net BuyingNet Selling
RPRX61.87%17.28%Net SellingNet Selling
BNTX19.92%0.00%
UTHR86.95%13.05%Net SellingNet Selling

Insmed Stock Ownership FAQ

Who owns Insmed?

Insmed (NASDAQ: INSM) is owned by 98.82% 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 10.17% of the company. Richard S. Kollender's Insmed shares are currently valued at $3.07B.

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