William Lewis

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

Net buy / sell volume (all companies)

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions · open-market

Include grants & non-market

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

$853.1K

8.0K sh · $106.97

Own -3%
INSM Sell·S
May 18, 26

Chair and CEO · 10b5-1

$1.3M

11.8K sh · $106.39

Own -4%
INSM Sell·S
May 18, 26

Chair and CEO · 10b5-1

$605.9K

5.8K sh · $105.32

Own -2%
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

$53.2K

381 sh · $139.60

Own -0%
INSM Sell·S
May 4, 26

Chair and CEO · 10b5-1

$173.4K

1.2K sh · $139.09

Own -0%
INSM Sell·S
May 4, 26

Chair and CEO · 10b5-1

$375.1K

2.7K sh · $137.86

Own -1%
INSM Sell·S
May 4, 26

Chair and CEO · 10b5-1

$728.6K

5.3K sh · $137.01

Own -2%
INSM Sell·S
May 4, 26

Chair and CEO · 10b5-1

$81.0K

599 sh · $135.18

Own -0%
INSM Sell·S
May 4, 26

Chair and CEO · 10b5-1

$58.1K

433 sh · $134.18

Own -0%
INSM Sell·S
Apr 16, 26

Chair and CEO · 10b5-1

$120.3K

825 sh · $145.79

Own -0%
INSM Sell·S
Apr 16, 26

Chair and CEO · 10b5-1

$326.2K

2.3K sh · $144.66

Own -1%
INSM Sell·S
Apr 16, 26

Chair and CEO · 10b5-1

$772.7K

5.4K sh · $143.81

Own -2%
INSM Sell·S
Apr 16, 26

Chair and CEO · 10b5-1

$321.2K

2.2K sh · $142.99

Own -1%
INSM Sell·S
Apr 6, 26

Chair and CEO · 10b5-1

$235.2K

1.4K sh · $164.01

Own -0%
INSM Sell·S
Apr 6, 26

Chair and CEO · 10b5-1

$1.4M

8.5K sh · $163.23

Own -3%
INSM Sell·S
Apr 6, 26

Chair and CEO · 10b5-1

$127.3K

787 sh · $161.73

Own -0%

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	8.0K	-3%	$106.97	$853.1K
May 18, 2026	INSM	Chair and CEO	Sell S	11.8K	-4%	$106.39	$1.3M
May 18, 2026	INSM	Chair and CEO	Sell S	5.8K	-2%	$105.32	$605.9K
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	381	-0%	$139.60	$53.2K
May 4, 2026	INSM	Chair and CEO	Sell S	1.2K	-0%	$139.09	$173.4K
May 4, 2026	INSM	Chair and CEO	Sell S	2.7K	-1%	$137.86	$375.1K
May 4, 2026	INSM	Chair and CEO	Sell S	5.3K	-2%	$137.01	$728.6K
May 4, 2026	INSM	Chair and CEO	Sell S	599	-0%	$135.18	$81.0K
May 4, 2026	INSM	Chair and CEO	Sell S	433	-0%	$134.18	$58.1K
Apr 16, 2026	INSM	Chair and CEO	Sell S	825	-0%	$145.79	$120.3K
Apr 16, 2026	INSM	Chair and CEO	Sell S	2.3K	-1%	$144.66	$326.2K
Apr 16, 2026	INSM	Chair and CEO	Sell S	5.4K	-2%	$143.81	$772.7K
Apr 16, 2026	INSM	Chair and CEO	Sell S	2.2K	-1%	$142.99	$321.2K
Apr 6, 2026	INSM	Chair and CEO	Sell S	1.4K	-0%	$164.01	$235.2K
Apr 6, 2026	INSM	Chair and CEO	Sell S	8.5K	-3%	$163.23	$1.4M
Apr 6, 2026	INSM	Chair and CEO	Sell S	787	-0%	$161.73	$127.3K

About William Lewis

This profile aggregates every SEC Form 4 insider transaction reported by William Lewis 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.