Lewis William

Insider

Chair and CEO

Trades at: INSM· NAMS

30D 90D 1Y

Net shares · 90d

-85.1K

0 buy · 85.1K sell

Net value · 90d

-$10.4M

$0 in · $10.4M out

Sentiment · 90d

Net selling

0% buying · 100% selling

Open-market trades · 90d

0 buy · 85.1K 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.

All transactions

Show open-market only

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 Exercise·M
May 18, 26

Chair and CEO · 10b5-1

$0

10.7K sh · 2 lots

Own +152%
INSM Sell·S
May 18, 26

Chair and CEO · 10b5-1

$2.7M

25.6K sh · $106.33 avg · 3 lots

Own -9%
INSM Exercise·M
May 18, 26

Chair and CEO · 10b5-1

$266.8K

10.7K sh · $24.94 avg · 2 lots

Own +4%
INSM Sell·S
May 13, 26

Chair and CEO

$1.5M

13.3K sh · $116.18

Own -4%
INSM Exercise·M
May 4, 26

Chair and CEO · 10b5-1

$0

10.7K sh · 2 lots

Own +93%
INSM Sell·S
May 4, 26

Chair and CEO · 10b5-1

$1.5M

10.7K sh · $137.34 avg · 6 lots

Own -3%
INSM Exercise·M
May 4, 26

Chair and CEO · 10b5-1

$266.8K

10.7K sh · $24.94 avg · 2 lots

Own +4%
INSM Exercise·M
Apr 16, 26

Chair and CEO · 10b5-1

$0

10.7K sh · 2 lots

Own +67%
INSM Sell·S
Apr 16, 26

Chair and CEO · 10b5-1

$1.5M

10.7K sh · $143.97 avg · 4 lots

Own -3%
INSM Exercise·M
Apr 16, 26

Chair and CEO · 10b5-1

$266.8K

10.7K sh · $24.94 avg · 2 lots

Own +4%
INSM Exercise·M
Apr 6, 26

Chair and CEO · 10b5-1

$0

10.7K sh · 2 lots

Own +52%
INSM Sell·S
Apr 6, 26

Chair and CEO · 10b5-1

$1.7M

10.7K sh · $163.22 avg · 3 lots

Own -3%
INSM Exercise·M
Apr 6, 26

Chair and CEO · 10b5-1

$266.8K

10.7K sh · $24.94 avg · 2 lots

Own +4%

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	Exercise M	10.7K2 lots	+152%	—	$0
May 18, 2026	INSM	Chair and CEO	Sell S	25.6K3 lots	-9%	$106.33 avg	$2.7M
May 18, 2026	INSM	Chair and CEO	Exercise M	10.7K2 lots	+4%	$24.94 avg	$266.8K
May 13, 2026	INSM	Chair and CEO	Sell S	13.3K	-4%	$116.18	$1.5M
May 4, 2026	INSM	Chair and CEO	Exercise M	10.7K2 lots	+93%	—	$0
May 4, 2026	INSM	Chair and CEO	Sell S	10.7K6 lots	-3%	$137.34 avg	$1.5M
May 4, 2026	INSM	Chair and CEO	Exercise M	10.7K2 lots	+4%	$24.94 avg	$266.8K
Apr 16, 2026	INSM	Chair and CEO	Exercise M	10.7K2 lots	+67%	—	$0
Apr 16, 2026	INSM	Chair and CEO	Sell S	10.7K4 lots	-3%	$143.97 avg	$1.5M
Apr 16, 2026	INSM	Chair and CEO	Exercise M	10.7K2 lots	+4%	$24.94 avg	$266.8K
Apr 6, 2026	INSM	Chair and CEO	Exercise M	10.7K2 lots	+52%	—	$0
Apr 6, 2026	INSM	Chair and CEO	Sell S	10.7K3 lots	-3%	$163.22 avg	$1.7M
Apr 6, 2026	INSM	Chair and CEO	Exercise M	10.7K2 lots	+4%	$24.94 avg	$266.8K

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.