United States Biotechnology & Medical Research

Insmed Inc (INSM)

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Insmed Inc. experienced significant insider trading activity over the past ninety days, totaling sixty-two transactions. Executives, including CEO William Lewis and Chief Medical Officer Martina Flammer, exclusively executed sales amounting to approximately 43.3 million dollars. These divestments occurred alongside a 27.6 percent stock price increase, following the most recent August 2026 earnings report.
Ticker: INSM Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Top insiders
Trades
Planned sale 6 Aug 2026
Value US$4,580,501.56 | Price 423.12 | Shares 11,171 (-41.6%)
Planned sale 6 Aug 2026
Value US$3,509,476.25 | Price 393.67 | Shares 37,179 (-23.7%)
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-08-07 2026-08-06 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
11,171 -41.6%
423.12
US$4,580,502 		11,171 -41.6% 423.12 US$4,580,502
2026-08-07 2026-08-06 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
37,179 -23.7%
393.67
US$3,509,476 		37,179 -23.7% 393.67 US$3,509,476
2026-08-06 2026-08-06 PrS Proposed sale
2.7
Martina Flammer

Officer

Officer
22,117
17.41
US$2,948,514 		22,117 17.41 US$2,948,514
2026-07-24 2026-07-23 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
1,000 -2.2%
106.43
US$100,000 		1,000 -2.2% 106.43 US$100,000
2026-07-24 2026-07-23 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
1,000 -1.8%
105.62
US$100,000 		1,000 -1.8% 105.62 US$100,000
2026-07-23 2026-07-23 PrS Proposed sale
3.3
William Lewis

Officer

Officer
1,000
106.06
US$100,000 		1,000 106.06 US$100,000
2026-07-10 2026-07-09 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
3,359 -1.3%
118.52
US$398,109 		3,359 -1.3% 118.52 US$398,109
2026-07-10 2026-07-09 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
2,335 -0.9%
117.62
US$274,643 		2,335 -0.9% 117.62 US$274,643
2026-07-10 2026-07-09 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
5,005 -1.9%
116.55
US$583,333 		5,005 -1.9% 116.55 US$583,333
2026-07-09 2026-07-09 PrS Proposed sale
3.3
William Lewis

Officer

Officer
10,699
117.40
US$1,256,029 		10,699 117.40 US$1,256,029
2026-07-08 2026-07-06 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
7,448 -11.0%
110.60
US$823,749 		7,448 -11.0% 110.60 US$823,749
2026-07-08 2026-07-06 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
4,854 -6.7%
109.02
US$529,183 		4,854 -6.7% 109.02 US$529,183
2026-07-06 2026-07-06 PrS Proposed sale
2.7
Martina Flammer

Officer

Officer
12,302
109.97
US$1,352,864 		12,302 109.97 US$1,352,864
2026-06-26 2026-06-25 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
1,292 -0.5%
106.27
US$137,301 		1,292 -0.5% 106.27 US$137,301
2026-06-26 2026-06-25 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
2,456 -0.9%
105.27
US$258,543 		2,456 -0.9% 105.27 US$258,543
2026-06-26 2026-06-25 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
3,723 -1.4%
104.28
US$388,234 		3,723 -1.4% 104.28 US$388,234
2026-06-26 2026-06-25 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
1,836 -0.7%
103.10
US$189,292 		1,836 -0.7% 103.10 US$189,292
2026-06-26 2026-06-25 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
12,091 -4.3%
102.34
US$1,237,393 		12,091 -4.3% 102.34 US$1,237,393
2026-06-25 2026-06-25 PrS Proposed sale
3.3
William Lewis

Officer

Officer
21,398
103.31
US$2,210,653 		21,398 103.31 US$2,210,653
2026-06-24 2026-06-22 PlS Planned sale
3.3
Smith Michael Alexander

Chief Legal Officer

Officer
1,806 -4.6%
95.82
US$173,051 		1,806 -4.6% 95.82 US$173,051
2026-06-22 2026-06-22 PrS Proposed sale
3.3
Michael Smith

Officer

Officer
1,806
95.81
US$173,039 		1,806 95.81 US$173,039
2026-06-22 2026-06-22 PrS Proposed sale
3.3
Michael Smith

Officer

Officer
1,806
95.81
US$173,039 		1,806 95.81 US$173,039
2026-06-10 2026-06-08 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
6,515 -2.5%
94.03
US$612,605 		6,515 -2.5% 94.03 US$612,605
2026-06-08 2026-06-08 PrS Proposed sale
3.3
William Lewis

Officer

Officer
6,515
94.03
US$612,576 		6,515 94.03 US$612,576
2026-06-05 2026-06-05 PrS Proposed sale
2.7
Martina Flammer

Officer

Officer
1,858
103.77
US$192,811 		1,858 103.77 US$192,811
2026-06-05 2026-06-05 PrS Proposed sale
2.7
Martina Flammer

Officer

Officer
1,858
103.77
US$192,811 		1,858 103.77 US$192,811
2026-06-05 2026-06-05 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
1,858 -3.0%
103.78
US$192,823 		1,858 -3.0% 103.78 US$192,823
2026-06-05 2026-06-05 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
1,858 -3.0%
103.78
US$192,823 		1,858 -3.0% 103.78 US$192,823
2026-06-05 2026-06-03 S Sale
2.8
Bonstein Sara

Chief Financial Officer

Officer
2,404 -3.4%
102.27
US$245,857 		2,404 -3.4% 102.27 US$245,857
2026-06-05 2026-06-03 S Sale
2.8
Bonstein Sara

Chief Financial Officer

Officer
2,404 -3.4%
102.27
US$245,857 		2,404 -3.4% 102.27 US$245,857
2026-06-05 2026-06-03 S Sale
2.7
Adsett Roger

Chief Operating Officer

Officer
2,370 -2.3%
102.27
US$242,380 		2,370 -2.3% 102.27 US$242,380
2026-06-05 2026-06-03 S Sale
2.7
Adsett Roger

Chief Operating Officer

Officer
2,370 -2.3%
102.27
US$242,380 		2,370 -2.3% 102.27 US$242,380
2026-06-05 2026-06-03 S Sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
2,566 -4.0%
102.27
US$262,425 		2,566 -4.0% 102.27 US$262,425
2026-06-05 2026-06-03 S Sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
2,566 -4.0%
102.27
US$262,425 		2,566 -4.0% 102.27 US$262,425
2026-06-05 2026-06-03 S Sale
3.3
Smith Michael Alexander

Chief Legal Officer

Officer
2,159 -5.2%
102.27
US$220,801 		2,159 -5.2% 102.27 US$220,801
2026-06-05 2026-06-03 S Sale
3.3
Smith Michael Alexander

Chief Legal Officer

Officer
2,159 -5.2%
102.27
US$220,801 		2,159 -5.2% 102.27 US$220,801
2026-06-05 2026-06-03 S Sale
3.3
Lewis William

Chair and CEO

Executive Director
7,605 -2.8%
102.27
US$777,763 		7,605 -2.8% 102.27 US$777,763
2026-06-03 2026-06-03 PrS Proposed sale
2.8
Sara Bonstein

Officer

Officer
2,404
102.27
US$245,857 		2,404 102.27 US$245,857
2026-06-03 2026-06-03 PrS Proposed sale
2.7
Martina Flammer

Officer

Officer
2,566
102.27
US$262,424 		2,566 102.27 US$262,424
2026-06-03 2026-06-03 PrS Proposed sale
2.7
Roger Adsett

Officer

Officer
2,370
102.27
US$242,379 		2,370 102.27 US$242,379
2026-06-03 2026-06-03 PrS Proposed sale
3.3
Michael Smith

Officer

Officer
2,159
102.27
US$220,800 		2,159 102.27 US$220,800
2026-06-03 2026-06-03 PrS Proposed sale
3.3
William Lewis

Officer

Officer
7,605
102.27
US$777,763 		7,605 102.27 US$777,763
2026-05-22 2026-05-22 PrS Proposed sale
3.3
Michael Smith

Officer

Officer
6,149
108.46
US$666,951 		6,149 108.46 US$666,951
2026-05-22 2026-05-22 PlS Planned sale
3.3
Smith Michael Alexander

Chief Legal Officer

Officer
6,149 -12.9%
108.47
US$666,982 		6,149 -12.9% 108.47 US$666,982
2026-05-20 2026-05-18 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
7,975 -2.8%
106.97
US$853,086 		7,975 -2.8% 106.97 US$853,086
2026-05-20 2026-05-18 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
11,836 -4.0%
106.39
US$1,259,232 		11,836 -4.0% 106.39 US$1,259,232
2026-05-20 2026-05-18 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
5,753 -1.9%
105.32
US$605,906 		5,753 -1.9% 105.32 US$605,906
2026-05-18 2026-05-18 PrS Proposed sale
3.3
William Lewis

Officer

Officer
25,564
106.33
US$2,718,106 		25,564 106.33 US$2,718,106
2026-05-15 2026-05-14 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
10,479 -13.9%
117.54
US$1,231,702 		10,479 -13.9% 117.54 US$1,231,702
2026-05-14 2026-05-14 PrS Proposed sale
2.7
Martina Flammer

Officer

Officer
10,479
117.53
US$1,231,599 		10,479 117.53 US$1,231,599
2026-05-15 2026-05-13 S Sale
3.3
Smith Michael Alexander

Chief Legal Officer

Officer
4,109 -7.9%
116.18
US$477,384 		4,109 -7.9% 116.18 US$477,384
2026-05-15 2026-05-13 S Sale
2.8
Bonstein Sara

Chief Financial Officer

Officer
8,272 -10.4%
116.18
US$961,041 		8,272 -10.4% 116.18 US$961,041
2026-05-15 2026-05-13 S Sale
3.3
Lewis William

Chair and CEO

Executive Director
13,283 -4.4%
116.18
US$1,543,219 		13,283 -4.4% 116.18 US$1,543,219
2026-05-15 2026-05-13 S Sale
2.7
Adsett Roger

Chief Operating Officer

Officer
5,837 -5.5%
116.18
US$678,143 		5,837 -5.5% 116.18 US$678,143
2026-05-15 2026-05-13 S Sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
3,384 -4.3%
116.18
US$393,153 		3,384 -4.3% 116.18 US$393,153
2026-05-15 2026-05-13 S Sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
4,470 -5.4%
112.76
US$504,037 		4,470 -5.4% 112.76 US$504,037
2026-05-13 2026-05-13 PrS Proposed sale
2.7
Roger Adsett

Officer

Officer
5,837
116.18
US$678,142 		5,837 116.18 US$678,142
2026-05-13 2026-05-13 PrS Proposed sale
3.3
Michael Smith

Officer

Officer
4,109
116.18
US$477,383 		4,109 116.18 US$477,383
2026-05-13 2026-05-13 PrS Proposed sale
2.7
Martina Flammer

Officer

Officer
7,854
114.23
US$897,145 		7,854 114.23 US$897,145
2026-05-13 2026-05-13 PrS Proposed sale
2.8
Sara Bonstein

Officer

Officer
8,272
116.18
US$961,040 		8,272 116.18 US$961,040
2026-05-13 2026-05-13 PrS Proposed sale
3.3
William Lewis

Officer

Officer
13,283
116.18
US$1,543,218 		13,283 116.18 US$1,543,218
2026-05-13 2026-05-11 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
830 -1.0%
101.18
US$83,979 		830 -1.0% 101.18 US$83,979
2026-05-13 2026-05-11 PlS Planned sale
2.7
Flammer Martina M.D.

Chief Medical Officer

Officer
12,119 -12.6%
100.35
US$1,216,142 		12,119 -12.6% 100.35 US$1,216,142
2026-05-11 2026-05-11 PrS Proposed sale
2.7
Martina Flammer

Officer

Officer
12,949
100.40
US$1,300,105 		12,949 100.40 US$1,300,105
2026-05-06 2026-05-04 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
381 -0.1%
139.60
US$53,188 		381 -0.1% 139.60 US$53,188
2026-05-06 2026-05-04 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
1,247 -0.4%
139.09
US$173,445 		1,247 -0.4% 139.09 US$173,445
2026-05-06 2026-05-04 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
2,721 -0.9%
137.86
US$375,117 		2,721 -0.9% 137.86 US$375,117
2026-05-06 2026-05-04 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
5,318 -1.7%
137.01
US$728,619 		5,318 -1.7% 137.01 US$728,619
2026-05-06 2026-05-04 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
599 -0.2%
135.18
US$80,973 		599 -0.2% 135.18 US$80,973
2026-05-06 2026-05-04 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
433 -0.1%
134.18
US$58,100 		433 -0.1% 134.18 US$58,100
2026-05-04 2026-05-04 PrS Proposed sale
3.3
William Lewis

Officer

Officer
10,699
137.35
US$1,469,481 		10,699 137.35 US$1,469,481
2026-04-17 2026-04-16 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
825 -0.3%
145.79
US$120,277 		825 -0.3% 145.79 US$120,277
2026-04-17 2026-04-16 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
2,255 -0.7%
144.66
US$326,208 		2,255 -0.7% 144.66 US$326,208
2026-04-17 2026-04-16 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
5,373 -1.7%
143.81
US$772,691 		5,373 -1.7% 143.81 US$772,691
2026-04-17 2026-04-16 PlS Planned sale
3.3
Lewis William

Chair and CEO

Executive Director
2,246 -0.7%
142.99
US$321,156 		2,246 -0.7% 142.99 US$321,156
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