Lewis William

Insider

Chair and CEO

Trades at: INSM· NAMS

30D 90D 1Y

Net shares · 365d

-221.9K

0 buy · 221.9K sell

Net value · 365d

-$31.2M

$0 in · $31.2M out

Sentiment · 365d

Net selling

0% buying · 100% selling

Open-market trades · 365d

0 buy · 221.9K sell

Trading track record · all companies

Running net of open-market buys − sells across every company. Tap the line or a marker for details. ▲ buy · ▼ sell.

Transactions · 365d

Open-market Buys Sells All types

INSM Sell·S
Jun 8, 26

Chair and CEO · 10b5-1

$612.6K

6.5K sh · $94.03

Own -2%
INSM Sell·S
Jun 3, 26

Chair and CEO

$777.8K

7.6K sh · $102.27

Own -3%
INSM Sell·S
May 18, 26

Chair and CEO · 10b5-1

$2.7M

25.6K sh · $106.33 avg · 3 lots

Own -9%
INSM Sell·S
May 13, 26

Chair and CEO

$1.5M

13.3K sh · $116.18

Own -4%
INSM Sell·S
May 4, 26

Chair and CEO · 10b5-1

$1.5M

10.7K sh · $137.34 avg · 6 lots

Own -3%
INSM Sell·S
Apr 16, 26

Chair and CEO · 10b5-1

$1.5M

10.7K sh · $143.97 avg · 4 lots

Own -3%
INSM Sell·S
Apr 6, 26

Chair and CEO · 10b5-1

$1.7M

10.7K sh · $163.22 avg · 3 lots

Own -3%
INSM Sell·S
Mar 19, 26

Chair and CEO · 10b5-1

$1.5M

10.7K sh · $143.52 avg · 3 lots

Own -3%
INSM Sell·S
Mar 5, 26

Chair and CEO · 10b5-1

$1.6M

10.7K sh · $146.03 avg · 4 lots

Own -3%
INSM Sell·S
Feb 19, 26

Chair and CEO · 10b5-1

$1.6M

10.7K sh · $150.97 avg · 5 lots

Own -3%
INSM Sell·S
Feb 9, 26

Chair and CEO · 10b5-1

$2.0M

13.4K sh · $147.79 avg · 3 lots

Own -4%
INSM Sell·S
Feb 3, 26

Chair and CEO

$470.4K

3.0K sh · $156.34

Own -1%
INSM Sell·S
Jan 20, 26

Chair and CEO · 10b5-1

$1.7M

10.7K sh · $158.93 avg · 5 lots

Own -3%
INSM Sell·S
Jan 12, 26

Chair and CEO · 10b5-1

$3.2M

19.2K sh · $169.00 avg · 7 lots

Own -6%
INSM Sell·S
Jan 8, 26

Chair and CEO

$1.7M

9.7K sh · $174.03 avg · 3 lots

Own -3%
INSM Sell·S
Dec 18, 25

Chair and CEO · 10b5-1

$1.8M

10.7K sh · $166.97 avg · 10 lots

Own -3%
INSM Sell·S
Dec 4, 25

Chair and CEO · 10b5-1

$2.2M

10.7K sh · $205.62 avg · 4 lots

Own -3%
INSM Sell·S
Aug 18, 25

Chair and CEO · 10b5-1

$881.5K

6.9K sh · $128.40 avg · 3 lots

Own -3%
INSM Sell·S
Aug 4, 25

Chair and CEO · 10b5-1

$750.0K

6.8K sh · $109.81 avg · 3 lots

Own -3%
INSM Sell·S
Jul 15, 25

Chair and CEO · 10b5-1

$699.2K

6.8K sh · $102.37 avg · 3 lots

Own -3%
INSM Sell·S
Jul 1, 25

Chair and CEO · 10b5-1

$671.6K

6.8K sh · $98.33 avg · 3 lots

Own -3%

Date▾	Ticker	Role	Type	Shares	Own Δ	Price	Value
Jun 8, 2026	INSM	Chair and CEO	Sell S	6.5K	-2%	$94.03	$612.6K
Jun 3, 2026	INSM	Chair and CEO	Sell S	7.6K	-3%	$102.27	$777.8K
May 18, 2026	INSM	Chair and CEO	Sell S	25.6K3 lots	-9%	$106.33 avg	$2.7M
May 13, 2026	INSM	Chair and CEO	Sell S	13.3K	-4%	$116.18	$1.5M
May 4, 2026	INSM	Chair and CEO	Sell S	10.7K6 lots	-3%	$137.34 avg	$1.5M
Apr 16, 2026	INSM	Chair and CEO	Sell S	10.7K4 lots	-3%	$143.97 avg	$1.5M
Apr 6, 2026	INSM	Chair and CEO	Sell S	10.7K3 lots	-3%	$163.22 avg	$1.7M
Mar 19, 2026	INSM	Chair and CEO	Sell S	10.7K3 lots	-3%	$143.52 avg	$1.5M
Mar 5, 2026	INSM	Chair and CEO	Sell S	10.7K4 lots	-3%	$146.03 avg	$1.6M
Feb 19, 2026	INSM	Chair and CEO	Sell S	10.7K5 lots	-3%	$150.97 avg	$1.6M
Feb 9, 2026	INSM	Chair and CEO	Sell S	13.4K3 lots	-4%	$147.79 avg	$2.0M
Feb 3, 2026	INSM	Chair and CEO	Sell S	3.0K	-1%	$156.34	$470.4K
Jan 20, 2026	INSM	Chair and CEO	Sell S	10.7K5 lots	-3%	$158.93 avg	$1.7M
Jan 12, 2026	INSM	Chair and CEO	Sell S	19.2K7 lots	-6%	$169.00 avg	$3.2M
Jan 8, 2026	INSM	Chair and CEO	Sell S	9.7K3 lots	-3%	$174.03 avg	$1.7M
Dec 18, 2025	INSM	Chair and CEO	Sell S	10.7K10 lots	-3%	$166.97 avg	$1.8M
Dec 4, 2025	INSM	Chair and CEO	Sell S	10.7K4 lots	-3%	$205.62 avg	$2.2M
Aug 18, 2025	INSM	Chair and CEO	Sell S	6.9K3 lots	-3%	$128.40 avg	$881.5K
Aug 4, 2025	INSM	Chair and CEO	Sell S	6.8K3 lots	-3%	$109.81 avg	$750.0K
Jul 15, 2025	INSM	Chair and CEO	Sell S	6.8K3 lots	-3%	$102.37 avg	$699.2K
Jul 1, 2025	INSM	Chair and CEO	Sell S	6.8K3 lots	-3%	$98.33 avg	$671.6K

Buy Sell Non-market (grant · exercise · gift)

About Lewis William

This profile aggregates every SEC Form 4 insider transaction reported by Lewis William across all companies they trade. Open-market purchases (code P) and sales (code S) are the highest-signal, discretionary trades; grants (A), option exercises (M) and gifts (G) reflect compensation rather than conviction and carry no market price. Figures cover the selected period and update as new filings are ingested.