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Home›INSM›Insider trades
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Insider trading · SEC Form 4

Insmed Inc (INSM) insider trading — SEC Form 4 history

As of the latest Form 4 filed Jul 10, 2026.

Our verdictHold→

What Insmed Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.

Insider buys · 12m
0
Insider sells · 12m
52
Distinct insiders · 12m
12
Last sale
Jul 10, 2026
3 days ago
Bought · 12m
—
Sold · 12m
$28.8M
Net disclosed value · 12m
−$28.8M

Insider buying vs selling

Buy / sell pressure · 12m
by trade count
0 up52 down
Disclosed value by month
BoughtSold
$20.0M0$20.0MMar '26May '26Jul '26

Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.

Form 4 transactions

Newest filing first — the 81 most recent filings for INSM.

Form 4 insider transactions for INSM
FiledTrade dateInsiderTransactionSharesPriceValue10b5-1Filing
2026-07-102026-07-09
Lewis William
Chair and CEO
SSale−3.36K$118.52$398KYes (planned)Form 4 ↗
2026-07-102026-07-09Lewis William, Chair and CEO〃SSale−2.33K$117.62$275KYes (planned)Form 4 ↗
2026-07-102026-07-09Lewis William, Chair and CEO〃SSale−5.00K$116.55$583KYes (planned)Form 4 ↗
2026-07-102026-07-09Lewis William, Chair and CEO〃MExercise+4.44K$17.16$76.2KYes (planned)Form 4 ↗
2026-07-102026-07-09Lewis William, Chair and CEO〃MExercise+6.26K$30.46$191KYes (planned)Form 4 ↗
2026-07-082026-07-06
Flammer Martina M.D.
Chief Medical Officer
SSale−7.45K$110.60$824KYes (planned)Form 4 ↗
2026-07-082026-07-06Flammer Martina M.D., Chief Medical Officer〃SSale−4.85K$109.02$529KYes (planned)Form 4 ↗
2026-07-082026-07-06Flammer Martina M.D., Chief Medical Officer〃MExercise+4.36K$19.74$86.0KYes (planned)Form 4 ↗
2026-07-082026-07-06Flammer Martina M.D., Chief Medical Officer〃MExercise+7.95K$29.13$231KYes (planned)Form 4 ↗
2026-06-262026-06-25
Lewis William
Chair and CEO
SSale−1.29K$106.27$137KYes (planned)Form 4 ↗
2026-06-262026-06-25Lewis William, Chair and CEO〃SSale−2.46K$105.27$259KYes (planned)Form 4 ↗
2026-06-262026-06-25Lewis William, Chair and CEO〃SSale−3.72K$104.28$388KYes (planned)Form 4 ↗
2026-06-262026-06-25Lewis William, Chair and CEO〃SSale−1.84K$103.10$189KYes (planned)Form 4 ↗
2026-06-262026-06-25Lewis William, Chair and CEO〃SSale−12.1K$102.34$1.24MYes (planned)Form 4 ↗
2026-06-262026-06-25Lewis William, Chair and CEO〃MExercise+8.88K$17.16$152KYes (planned)Form 4 ↗
2026-06-262026-06-25Lewis William, Chair and CEO〃MExercise+12.5K$30.46$381KYes (planned)Form 4 ↗
2026-06-242026-06-23
Butera Samuele
SVP, GM, Global Respiratory
AAward+7.34K——NoForm 4 ↗
2026-06-242026-06-22
Smith Michael Alexander
Chief Legal Officer
SSale−1.81K$95.82$173KYes (planned)Form 4 ↗
2026-06-102026-06-08
Lewis William
Chair and CEO
SSale−6.51K$94.03$613KYes (planned)Form 4 ↗
2026-06-052026-06-05
Flammer Martina M.D.
Chief Medical Officer
SSale−1.86K$103.78$193KYes (planned)Form 4 ↗
2026-06-052026-06-03
Smith Michael Alexander
Chief Legal Officer
SSale−2.16K$102.27$221KNoForm 4 ↗
2026-06-052026-06-03
Flammer Martina M.D.
Chief Medical Officer
SSale−2.57K$102.27$262KYes (planned)Form 4 ↗
2026-06-052026-06-03
Adsett Roger
Chief Operating Officer
SSale−2.37K$102.27$242KNoForm 4 ↗
2026-06-052026-06-03
Bonstein Sara
Chief Financial Officer
SSale−2.40K$102.27$246KNoForm 4 ↗
2026-06-052026-06-03
Lewis William
Chair and CEO
SSale−7.61K$102.27$778KNoForm 4 ↗
2026-05-222026-05-22
Smith Michael Alexander
Chief Legal Officer
SSale−6.15K$108.47$667KYes (planned)Form 4 ↗
2026-05-202026-05-18
Lewis William
Chair and CEO
SSale−7.97K$106.97$853KYes (planned)Form 4 ↗
2026-05-202026-05-18Lewis William, Chair and CEO〃SSale−11.8K$106.39$1.26MYes (planned)Form 4 ↗
2026-05-202026-05-18Lewis William, Chair and CEO〃SSale−5.75K$105.32$606KYes (planned)Form 4 ↗
2026-05-202026-05-18Lewis William, Chair and CEO〃MExercise+4.44K$17.16$76.2KYes (planned)Form 4 ↗
2026-05-202026-05-18Lewis William, Chair and CEO〃MExercise+6.26K$30.46$191KYes (planned)Form 4 ↗
2026-05-152026-05-14
Flammer Martina M.D.
Chief Medical Officer
SSale−10.5K$117.54$1.23MYes (planned)Form 4 ↗
2026-05-152026-05-13
Smith Michael Alexander
Chief Legal Officer
SSale−4.11K$116.18$477KNoForm 4 ↗
2026-05-152026-05-13
Flammer Martina M.D.
Chief Medical Officer
SSale−3.38K$116.18$393KYes (planned)Form 4 ↗
2026-05-152026-05-13Flammer Martina M.D., Chief Medical Officer〃SSale−4.47K$112.76$504KYes (planned)Form 4 ↗
2026-05-152026-05-13
Desjardins Clarissa
Director
AAward+3.31K——NoForm 4 ↗
2026-05-152026-05-13
ANDERSON ELIZABETH M
Director
AAward+3.31K——NoForm 4 ↗
2026-05-152026-05-13
LEE LEO
Director
AAward+3.31K——NoForm 4 ↗
2026-05-152026-05-13
Adsett Roger
Chief Operating Officer
SSale−5.84K$116.18$678KNoForm 4 ↗
2026-05-152026-05-13
Brennan David R
Director
AAward+3.31K——NoForm 4 ↗
2026-05-152026-05-13
Bonstein Sara
Chief Financial Officer
SSale−8.27K$116.18$961KNoForm 4 ↗
2026-05-152026-05-13
Lewis William
Chair and CEO
SSale−13.3K$116.18$1.54MNoForm 4 ↗
2026-05-152026-05-13
SCHAFER CAROL
Director
AAward+3.31K——NoForm 4 ↗
2026-05-152026-05-13
SHAROKY MELVIN MD
Director
AAward+3.31K——NoForm 4 ↗
2026-05-132026-05-11
Flammer Martina M.D.
Chief Medical Officer
SSale−830.00$101.18$84.0KYes (planned)Form 4 ↗
2026-05-132026-05-11Flammer Martina M.D., Chief Medical Officer〃SSale−12.1K$100.35$1.22MYes (planned)Form 4 ↗
2026-05-132026-05-11Flammer Martina M.D., Chief Medical Officer〃MExercise+12.9K$17.07$221KYes (planned)Form 4 ↗
2026-05-062026-05-04
Lewis William
Chair and CEO
SSale−381.00$139.60$53.2KYes (planned)Form 4 ↗
2026-05-062026-05-04Lewis William, Chair and CEO〃SSale−1.25K$139.09$173KYes (planned)Form 4 ↗
2026-05-062026-05-04Lewis William, Chair and CEO〃SSale−2.72K$137.86$375KYes (planned)Form 4 ↗
2026-05-062026-05-04Lewis William, Chair and CEO〃SSale−5.32K$137.01$729KYes (planned)Form 4 ↗
2026-05-062026-05-04Lewis William, Chair and CEO〃SSale−599.00$135.18$81.0KYes (planned)Form 4 ↗
2026-05-062026-05-04Lewis William, Chair and CEO〃SSale−433.00$134.18$58.1KYes (planned)Form 4 ↗
2026-05-062026-05-04Lewis William, Chair and CEO〃MExercise+4.44K$17.16$76.2KYes (planned)Form 4 ↗
2026-05-062026-05-04Lewis William, Chair and CEO〃MExercise+6.26K$30.46$191KYes (planned)Form 4 ↗
2026-04-172026-04-16
Lewis William
Chair and CEO
SSale−825.00$145.79$120KYes (planned)Form 4 ↗
2026-04-172026-04-16Lewis William, Chair and CEO〃SSale−2.25K$144.66$326KYes (planned)Form 4 ↗
2026-04-172026-04-16Lewis William, Chair and CEO〃SSale−5.37K$143.81$773KYes (planned)Form 4 ↗
2026-04-172026-04-16Lewis William, Chair and CEO〃SSale−2.25K$142.99$321KYes (planned)Form 4 ↗
2026-04-172026-04-16Lewis William, Chair and CEO〃MExercise+4.44K$17.16$76.2KYes (planned)Form 4 ↗
2026-04-172026-04-16Lewis William, Chair and CEO〃MExercise+6.26K$30.46$191KYes (planned)Form 4 ↗
2026-04-082026-04-06
Lewis William
Chair and CEO
SSale−1.43K$164.01$235KYes (planned)Form 4 ↗
2026-04-082026-04-06Lewis William, Chair and CEO〃SSale−8.48K$163.23$1.38MYes (planned)Form 4 ↗
2026-04-082026-04-06Lewis William, Chair and CEO〃SSale−787.00$161.73$127KYes (planned)Form 4 ↗
2026-04-082026-04-06Lewis William, Chair and CEO〃MExercise+4.44K$17.16$76.2KYes (planned)Form 4 ↗
2026-04-082026-04-06Lewis William, Chair and CEO〃MExercise+6.26K$30.46$191KYes (planned)Form 4 ↗
2026-03-312026-03-30
Smith Michael Alexander
Chief Legal Officer
SSale−19.6K$150.98$2.96MYes (planned)Form 4 ↗
2026-03-312026-03-30Smith Michael Alexander, Chief Legal Officer〃MExercise+14.0K$27.89$390KYes (planned)Form 4 ↗
2026-03-312026-03-30Smith Michael Alexander, Chief Legal Officer〃MExercise+5.65K$17.07$96.4KYes (planned)Form 4 ↗
2026-03-202026-03-19
Lewis William
Chair and CEO
SSale−4.53K$144.11$653KYes (planned)Form 4 ↗
2026-03-202026-03-19Lewis William, Chair and CEO〃SSale−4.54K$143.42$651KYes (planned)Form 4 ↗
2026-03-202026-03-19Lewis William, Chair and CEO〃SSale−1.63K$142.17$232KYes (planned)Form 4 ↗
2026-03-202026-03-19Lewis William, Chair and CEO〃MExercise+4.44K$17.16$76.2KYes (planned)Form 4 ↗
2026-03-202026-03-19Lewis William, Chair and CEO〃MExercise+6.26K$30.46$191KYes (planned)Form 4 ↗
2026-03-052026-03-05
Lewis William
Chair and CEO
SSale−2.13K$147.54$314KYes (planned)Form 4 ↗
2026-03-052026-03-05Lewis William, Chair and CEO〃SSale−3.90K$146.66$572KYes (planned)Form 4 ↗
2026-03-052026-03-05Lewis William, Chair and CEO〃SSale−2.59K$145.27$376KYes (planned)Form 4 ↗
2026-03-052026-03-05Lewis William, Chair and CEO〃SSale−2.08K$144.23$300KYes (planned)Form 4 ↗
2026-03-052026-03-05Lewis William, Chair and CEO〃MExercise+4.44K$17.16$76.2KYes (planned)Form 4 ↗
2026-03-052026-03-05Lewis William, Chair and CEO〃MExercise+6.26K$30.46$191KYes (planned)Form 4 ↗
2026-03-052026-03-03
SHAROKY MELVIN MD
Director
GGift−100.00$0.00$0.00NoForm 4 ↗

How to read a Form 4

Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.

The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.

One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.

See also INSM’s full analysis or the market-wide insider trading feed. The tabs above jump to INSM’s other SEC data.

Source: SEC Form 4 filings for INSM, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.

Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.

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NVDA$203.53▼3.52%AAPL$317.31▲0.63%GOOGL$352.51▼1.31%GOOG$350.67▼1.23%MSFT$390.99▲1.53%AMZN$247.31▲0.80%TSM$421.58▼2.89%SPCX$139.14▼4.24%AVGO$384.05▼3.98%META$656.73▼1.86%TSLA$394.76▼3.19%MU$937.00▼4.32%BRK-B$496.85▲0.64%BRK-A$744,850.01▲0.69%LLY$1,181.87▼0.56%AMD$534.39▼4.21%WMT$114.78▲0.77%JPM$334.53▼0.58%ASML$1,726.04▼3.97%V$357.75▲2.52%JNJ$257.77▲0.31%XOM$144.51▲4.05%INTC$103.12▼6.12%AMAT$575.39▼4.50%CSCO$119.25▼1.70%MA$537.70▲2.08%CAT$931.47▼2.20%ABBV$248.00▼0.03%LRCX$329.92▼5.83%BAC$59.50▼0.28%
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NVDA$203.53▼3.52%AAPL$317.31▲0.63%GOOGL$352.51▼1.31%GOOG$350.67▼1.23%MSFT$390.99▲1.53%AMZN$247.31▲0.80%TSM$421.58▼2.89%SPCX$139.14▼4.24%AVGO$384.05▼3.98%META$656.73▼1.86%TSLA$394.76▼3.19%MU$937.00▼4.32%BRK-B$496.85▲0.64%BRK-A$744,850.01▲0.69%LLY$1,181.87▼0.56%AMD$534.39▼4.21%WMT$114.78▲0.77%JPM$334.53▼0.58%ASML$1,726.04▼3.97%V$357.75▲2.52%JNJ$257.77▲0.31%XOM$144.51▲4.05%INTC$103.12▼6.12%AMAT$575.39▼4.50%CSCO$119.25▼1.70%MA$537.70▲2.08%CAT$931.47▼2.20%ABBV$248.00▼0.03%LRCX$329.92▼5.83%BAC$59.50▼0.28%
NVDA$203.53▼3.52%AAPL$317.31▲0.63%GOOGL$352.51▼1.31%GOOG$350.67▼1.23%MSFT$390.99▲1.53%AMZN$247.31▲0.80%TSM$421.58▼2.89%SPCX$139.14▼4.24%AVGO$384.05▼3.98%META$656.73▼1.86%TSLA$394.76▼3.19%MU$937.00▼4.32%BRK-B$496.85▲0.64%BRK-A$744,850.01▲0.69%LLY$1,181.87▼0.56%AMD$534.39▼4.21%WMT$114.78▲0.77%JPM$334.53▼0.58%ASML$1,726.04▼3.97%V$357.75▲2.52%JNJ$257.77▲0.31%XOM$144.51▲4.05%INTC$103.12▼6.12%AMAT$575.39▼4.50%CSCO$119.25▼1.70%MA$537.70▲2.08%CAT$931.47▼2.20%ABBV$248.00▼0.03%LRCX$329.92▼5.83%BAC$59.50▼0.28%