William Lewis Insmed Inc (INSM) insider trading activity

William Lewis is Chair and CEO of INSMED Inc. Currently has a direct ownership of 303,911 shares of INSM, which is worth approximately $58.7 Million. The most recent transaction as insider was on Dec 18, 2025, when has been sold 10,699 shares (Common Stock) at a price of $166.84 per share, resulting in proceeds of $1,785,021. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 304K

0.12% 3M change

21.05% 12M change

Total Value Held $58.7 Million

William Lewis Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Dec 18 2025	SELL Open market or private sale	$1,785,021 $166.84 p/Share	10,699 Reduced 3.4%	303,911 Common Stock
Dec 18 2025	BUY Exercise of conversion of derivative security	$254,743 $23.81 p/Share	10,699 Added 3.29%	314,610 Common Stock
Dec 04 2025	SELL Open market or private sale	$2,204,528 $206.05 p/Share	10,699 Reduced 3.4%	303,911 Common Stock
Dec 04 2025	BUY Exercise of conversion of derivative security	$254,743 $23.81 p/Share	10,699 Added 3.29%	314,610 Common Stock
Jun 16 2025	SELL Open market or private sale	$520,712 $100.06 p/Share	5,204 Reduced 1.69%	303,554 Common Stock
Jun 03 2025	SELL Open market or private sale	$391,248 $71.5 p/Share	5,472 Reduced 1.74%	308,758 Common Stock
May 20 2025	SELL Open market or private sale	$1,427,032 $67.77 p/Share	21,057 Reduced 6.28%	314,230 Common Stock

May 15 2025	BUY Grant, award, or other acquisition	-	22,314 Added 6.24%	335,287 Common Stock
May 14 2025	SELL Open market or private sale	$247,415 $65.61 p/Share	3,771 Reduced 1.19%	312,973 Common Stock
May 13 2025	SELL Open market or private sale	$1,169,486 $67.05 p/Share	17,442 Reduced 5.22%	316,744 Common Stock
Mar 17 2025	SELL Open market or private sale	$1,441,125 $76.86 p/Share	18,750 Reduced 5.31%	334,186 Common Stock
Mar 17 2025	BUY Exercise of conversion of derivative security	$426,750 $22.76 p/Share	18,750 Added 5.04%	352,936 Common Stock
Mar 03 2025	SELL Open market or private sale	$1,473,562 $78.59 p/Share	18,750 Reduced 5.31%	334,186 Common Stock
Mar 03 2025	BUY Exercise of conversion of derivative security	$426,750 $22.76 p/Share	18,750 Added 5.04%	352,936 Common Stock
Feb 18 2025	SELL Open market or private sale	$1,516,875 $80.9 p/Share	18,750 Reduced 5.31%	334,186 Common Stock
Feb 18 2025	BUY Exercise of conversion of derivative security	$426,750 $22.76 p/Share	18,750 Added 5.04%	352,936 Common Stock
Feb 06 2025	SELL Open market or private sale	$6,419,415 $80.9 p/Share	79,350 Reduced 14.88%	453,894 Common Stock
Feb 05 2025	BUY Grant, award, or other acquisition	-	153,710 Added 22.38%	533,244 Common Stock
Feb 03 2025	SELL Open market or private sale	$1,443,750 $77.0 p/Share	18,750 Reduced 4.71%	379,534 Common Stock
Feb 03 2025	BUY Exercise of conversion of derivative security	$426,750 $22.76 p/Share	18,750 Added 4.5%	398,284 Common Stock
Jan 15 2025	SELL Open market or private sale	$2,234,301 $70.25 p/Share	31,805 Reduced 7.73%	379,534 Common Stock
Jan 15 2025	BUY Exercise of conversion of derivative security	$426,750 $22.76 p/Share	18,750 Added 4.36%	411,339 Common Stock
Jan 10 2025	SELL Open market or private sale	$188,686 $63.36 p/Share	2,978 Reduced 0.75%	392,589 Common Stock
Jan 08 2025	SELL Open market or private sale	$263,774 $65.96 p/Share	3,999 Reduced 1.06%	372,743 Common Stock
Jan 08 2025	BUY Grant, award, or other acquisition	-	22,824 Added 5.46%	395,567 Common Stock

Also insider at

NAMS

NewAmsterdam Pharma Co N.V.

William Lewis

Chair and CEO

Bridgewater, NJ

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