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United States Biotechnology & Medical Research

Gossamer Bio Inc (GOSS)

Track

The most recent insider trading activity occurred on August 19, 2025, with a BUY transaction by Sandra Milligan. Prior to this, significant BUY transactions were made by executives in June 2024, including the President & CEO and COO/CFO. Earlier in March 2024, several executives made SELL transactions.
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Ticker: GOSS Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
Milligan Sandra
1 purchase — total 50,016 USD
Buy 19 Aug 2025
Value US$2,197,475.10 | Price 435.02 | Shares 37,803
Sale 24 Jun 2024
Value US$4,797,731.70 | Price 231.67 | Shares 37,910
Buy 21 Jun 2024
Value US$250,281.60 | Price 0.67 | Shares 372,000
Buy 18 Jun 2024
Value US$59,110.00 | Price 0.59 | Shares 100,000
Buy 17 Jun 2024
Value US$15,050.00 | Price 0.60 | Shares 25,000
Sale 27 Mar 2024
Value US$26,772.93 | Price 1.16 | Shares 23,172
Sale 27 Mar 2024
Value US$7,429.86 | Price 1.16 | Shares 6,430
Sale 27 Mar 2024
Value US$7,430.51 | Price 1.16 | Shares 6,430
Sale 18 Mar 2024
Value US$5,342.73 | Price 1.33 | Shares 4,018
Sale 18 Mar 2024
Value US$5,341.93 | Price 1.33 | Shares 4,018
Buy 15 Nov 2023
Value US$25,212.80 | Price 0.79 | Shares 32,000
Buy 13 Nov 2023
Value US$112,880.00 | Price 0.56 | Shares 200,000
Sale 22 Jun 2023
Value US$2,340.06 | Price 1.29 | Shares 1,814
Buy 4 Apr 2023
Value US$56,094.50 | Price 1.02 | Shares 55,000
Buy 22 Mar 2023
Value US$503,579.60 | Price 1.14 | Shares 440,500
Buy 21 Mar 2023
Value US$322,323.94 | Price 1.20 | Shares 269,389
Buy 20 Mar 2023
Value US$48,435.00 | Price 0.97 | Shares 50,000
Buy 20 Mar 2023
Value US$174,485.70 | Price 1.03 | Shares 168,683
Buy 20 Mar 2023
Value US$22,144.50 | Price 1.20 | Shares 18,500
Sale 16 Mar 2023
Value US$6,619.84 | Price 1.10 | Shares 6,029
Sale 16 Mar 2023
Value US$8,305.27 | Price 1.10 | Shares 7,564
Sale 16 Mar 2023
Value US$8,304.17 | Price 1.10 | Shares 7,563
Sale 24 Oct 2022
Value US$58,867.95 | Price 12.07 | Shares 4,876
Sale 24 Oct 2022
Value US$57,431.26 | Price 12.07 | Shares 4,757
Sale 24 Oct 2022
Value US$57,431.26 | Price 12.07 | Shares 4,757
Buy 15 Jul 2022
Value US$99,995.49 | Price 7.21 | Shares 13,869
Buy 15 Jul 2022
Value US$49,994.14 | Price 7.21 | Shares 6,934
Buy 15 Jul 2022
Value US$999,998.16 | Price 7.21 | Shares 138,696
Buy 15 Jul 2022
Value US$49,994.14 | Price 7.21 | Shares 6,934
Sale 1 Jul 2022
Value US$72,648.38 | Price 8.25 | Shares 8,808
Sale 22 Jun 2022
Value US$12,232.64 | Price 6.88 | Shares 1,778
Sale 4 May 2022
Value US$9,086.40 | Price 7.20 | Shares 1,262
Sale 23 Mar 2022
Value US$169,697.02 | Price 8.92 | Shares 19,035
Sale 23 Mar 2022
Value US$95,586.63 | Price 8.92 | Shares 10,722
Sale 23 Mar 2022
Value US$95,586.63 | Price 8.92 | Shares 10,722
Sale 16 Mar 2022
Value US$51,977.56 | Price 8.28 | Shares 6,279
Sale 16 Mar 2022
Value US$41,406.56 | Price 8.28 | Shares 5,002
Sale 16 Mar 2022
Value US$51,975.56 | Price 8.28 | Shares 6,278
Sale 25 Oct 2021
Value US$29,118.25 | Price 12.25 | Shares 2,377
Sale 25 Oct 2021
Value US$29,118.25 | Price 12.25 | Shares 2,377
Sale 25 Oct 2021
Value US$29,118.25 | Price 12.25 | Shares 2,377
Sale 23 Mar 2021
Value US$52,051.93 | Price 9.48 | Shares 5,491
Sale 23 Mar 2021
Value US$52,045.75 | Price 9.48 | Shares 5,490
Sale 23 Mar 2021
Value US$52,050.69 | Price 9.48 | Shares 5,490
Buy 14 Oct 2020
Value US$30,036.00 | Price 10.01 | Shares 3,000
Buy 14 Oct 2020
Value US$999,995.46 | Price 10.36 | Shares 96,520
Buy 14 Oct 2020
Value US$23,818.00 | Price 9.53 | Shares 2,500
Buy 23 Jun 2020
Value US$25,922.40 | Price 12.96 | Shares 2,000
Sale 30 Dec 2019
Value US$600,004.00 | Price 15.00 | Shares 40,000
Sale 27 Dec 2019
Value US$31,534.11 | Price 15.81 | Shares 1,994
Buy 27 Sep 2019
Value US$16,654.20 | Price 16.65 | Shares 1,000
Buy 27 Sep 2019
Value US$167,980.00 | Price 16.80 | Shares 10,000
Buy 27 Sep 2019
Value US$167,980.00 | Price 16.80 | Shares 10,000
Buy 26 Sep 2019
Value US$18,810.16 | Price 16.78 | Shares 1,121
Sale 20 Sep 2019
Value US$4,032,560.54 | Price 21.96 | Shares 183,607
Sale 18 Sep 2019
Value US$997,636.80 | Price 21.88 | Shares 45,600
Sale 17 Sep 2019
Value US$505,791.00 | Price 21.62 | Shares 23,400
Sale 16 Sep 2019
Value US$284,330.55 | Price 21.52 | Shares 13,213
Sale 11 Sep 2019
Value US$1,713,629.14 | Price 21.31 | Shares 80,403
Sale 10 Sep 2019
Value US$679,865.37 | Price 21.00 | Shares 32,373
Sale 6 Sep 2019
Value US$187,103.07 | Price 21.51 | Shares 8,700
Sale 5 Sep 2019
Value US$274,434.35 | Price 21.60 | Shares 12,704
Sale 29 Aug 2019
Value US$527,318.67 | Price 20.09 | Shares 26,252
Sale 28 Aug 2019
Value US$466,724.19 | Price 19.65 | Shares 23,748
Buy 30 May 2019
Value US$18,700.00 | Price 18.70 | Shares 1,000
Buy 12 Feb 2019
Value US$24,800.00 | Price 16.00 | Shares 1,550
Buy 12 Feb 2019
Value US$115,200.00 | Price 16.00 | Shares 7,200
Buy 12 Feb 2019
Value US$96,000.00 | Price 16.00 | Shares 6,000
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
2025-08-20 2025-08-19 B Purchase
3.9
Milligan Sandra
Non-Executive Director
37,803 -40.0%
435.02
US$2,197,475 		37,803 -40.0% 435.02 US$2,197,475
2024-06-25 2024-06-24 S Sale
3.8
Aranda Richard

Chief Medical Officer

Officer
37,910 -25.1%
231.67
US$4,797,732 		37,910 -25.1% 231.67 US$4,797,732
2024-06-24 2024-06-21 B Purchase
2.7
Hasnain Faheem

President & CEO

Executive Director
68,949 +40.8%
85.12
US$3,024,149 		68,949 +40.8% 85.12 US$3,024,149
2024-06-20 2024-06-18 B Purchase
3.0
Giraudo Bryan

COO/CFO

Officer
100,000 +26.3%
0.59
US$59,110 		100,000 +26.3% 0.59 US$59,110
2024-06-20 2024-06-17 B Purchase
3.3
Smith Robert Paul JR

Chief Commercial Officer

Officer
25,000 +inf%
0.60
US$15,050 		25,000 +inf% 0.60 US$15,050
2024-03-28 2024-03-27 S Sale
2.7
Hasnain Faheem

President & CEO

Executive Director
23,172 -16.2%
1.16
US$26,773 		23,172 -16.2% 1.16 US$26,773
2024-03-28 2024-03-27 S Sale
2.5
Christian Waage

EVP, Tech Ops and Admin

Officer
6,430 -1.1%
1.16
US$7,430 		6,430 -1.1% 1.16 US$7,430
2024-03-28 2024-03-27 S Sale
3.0
Giraudo Bryan

COO/CFO

Officer
6,430 -6.5%
1.16
US$7,431 		6,430 -6.5% 1.16 US$7,431
2024-03-19 2024-03-18 S Sale
3.8
Peterson Caryn

EVP, Regulatory Affairs

Officer
4,018 -7.5%
1.33
US$5,343 		4,018 -7.5% 1.33 US$5,343
2024-03-19 2024-03-18 S Sale
3.8
Aranda Richard

Chief Medical Officer

Officer
4,018 -2.0%
1.33
US$5,342 		4,018 -2.0% 1.33 US$5,342
2023-11-17 2023-11-15 B Purchase
3.9
Milligan Sandra
Non-Executive Director
32,000 +inf%
0.79
US$25,213 		32,000 +inf% 0.79 US$25,213
2023-11-14 2023-11-13 B Purchase
3.0
Giraudo Bryan

COO/CFO

Officer
200,000 +111.1%
0.56
US$112,880 		200,000 +111.1% 0.56 US$112,880
2023-06-26 2023-06-22 S Sale
3.8
Aranda Richard

Chief Medical Officer

Officer
1,814 -0.9%
1.29
US$2,340 		1,814 -0.9% 1.29 US$2,340
2023-04-05 2023-04-04 B Purchase
3.0
Giraudo Bryan

COO/CFO

Officer
55,000 +77.5%
1.02
US$56,094 		55,000 +77.5% 1.02 US$56,094
2023-03-22 2023-03-22 B Purchase
2.7
Hasnain Faheem

President & CEO

Executive Director
440,500 +10.9%
1.14
US$503,580 		440,500 +10.9% 1.14 US$503,580
2023-03-22 2023-03-21 B Purchase
2.7
Hasnain Faheem

President & CEO

Executive Director
269,389 +7.1%
1.20
US$322,324 		269,389 +7.1% 1.20 US$322,324
2023-03-22 2023-03-20 B Purchase
3.0
Giraudo Bryan

COO/CFO

Officer
50,000 +238.2%
0.97
US$48,435 		50,000 +238.2% 0.97 US$48,435
2023-03-22 2023-03-20 B Purchase
2.7
Hasnain Faheem

President & CEO

Executive Director
168,683 +4.7%
1.03
US$174,486 		168,683 +4.7% 1.03 US$174,486
2023-03-22 2023-03-20 B Purchase
2.5
Christian Waage

EVP, Tech Ops and Admin

Officer
18,500 +133.2%
1.20
US$22,144 		18,500 +133.2% 1.20 US$22,144
2023-03-20 2023-03-16 S Sale
3.0
Carter Laura

Chief Scientific Officer

Officer
6,029 -7.3%
1.10
US$6,620 		6,029 -7.3% 1.10 US$6,620
2023-03-20 2023-03-16 S Sale
3.8
Peterson Caryn

EVP, Regulatory Affairs

Officer
7,564 -12.3%
1.10
US$8,305 		7,564 -12.3% 1.10 US$8,305
2023-03-20 2023-03-16 S Sale
3.8
Aranda Richard

Chief Medical Officer

Officer
7,563 -3.7%
1.10
US$8,304 		7,563 -3.7% 1.10 US$8,304
2022-10-25 2022-10-24 S Sale
3.0
Carter Laura

Chief Scientific Officer

Officer
4,876 -5.6%
12.07
US$58,868 		4,876 -5.6% 12.07 US$58,868
2022-10-25 2022-10-24 S Sale
3.8
Aranda Richard

Chief Medical Officer

Officer
4,757 -2.3%
12.07
US$57,431 		4,757 -2.3% 12.07 US$57,431
2022-10-25 2022-10-24 S Sale
3.8
Peterson Caryn

EVP, Regulatory Affairs

Officer
4,757 -7.2%
12.07
US$57,431 		4,757 -7.2% 12.07 US$57,431
2022-07-15 2022-07-15 B Purchase
3.0
Giraudo Bryan

COO/CFO

Officer
13,869 +194.8%
7.21
US$99,995 		13,869 +194.8% 7.21 US$99,995
2022-07-15 2022-07-15 B Purchase
2.5
Christian Waage

EVP, Tech Ops and Admin

Officer
6,934 +99.7%
7.21
US$49,994 		6,934 +99.7% 7.21 US$49,994
2022-07-15 2022-07-15 B Purchase
2.7
Hasnain Faheem

President & CEO

Executive Director
138,696 +4.0%
7.21
US$999,998 		138,696 +4.0% 7.21 US$999,998
2022-07-15 2022-07-15 B Purchase
3.0
Carter Laura

Chief Scientific Officer

Officer
6,934 +8.6%
7.21
US$49,994 		6,934 +8.6% 7.21 US$49,994
2022-07-05 2022-07-01 S Sale
3.0
Carter Laura

Chief Scientific Officer

Officer
8,808 -9.9%
8.25
US$72,648 		8,808 -9.9% 8.25 US$72,648
2022-06-23 2022-06-22 S Sale
3.8
Aranda Richard

Chief Medical Officer

Officer
1,778 -0.8%
6.88
US$12,233 		1,778 -0.8% 6.88 US$12,233
2022-05-05 2022-05-04 S Sale
3.0
Carter Laura

Chief Scientific Officer

Officer
1,262 -1.4%
7.20
US$9,086 		1,262 -1.4% 7.20 US$9,086
2022-03-24 2022-03-23 S Sale
2.7
Hasnain Faheem

President & CEO

Executive Director
19,035 -11.7%
8.92
US$169,697 		19,035 -11.7% 8.92 US$169,697
2022-03-24 2022-03-23 S Sale
3.0
Giraudo Bryan

COO/CFO

Officer
10,722 -9.8%
8.92
US$95,587 		10,722 -9.8% 8.92 US$95,587
2022-03-24 2022-03-23 S Sale
2.5
Christian Waage

EVP, Tech Ops and Admin

Officer
10,722 -1.8%
8.92
US$95,587 		10,722 -1.8% 8.92 US$95,587
2022-03-17 2022-03-16 S Sale
3.8
Peterson Caryn

EVP, Regulatory Affairs

Officer
6,279 -8.7%
8.28
US$51,978 		6,279 -8.7% 8.28 US$51,978
2022-03-17 2022-03-16 S Sale
3.0
Carter Laura

Chief Scientific Officer

Officer
5,002 -5.2%
8.28
US$41,407 		5,002 -5.2% 8.28 US$41,407
2022-03-17 2022-03-16 S Sale
3.8
Aranda Richard

Chief Medical Officer

Officer
6,278 -2.9%
8.28
US$51,976 		6,278 -2.9% 8.28 US$51,976
2021-10-26 2021-10-25 S Sale
3.8
Aranda Richard

Chief Medical Officer

Officer
2,377 -1.1%
12.25
US$29,118 		2,377 -1.1% 12.25 US$29,118
2021-10-26 2021-10-25 S Sale
3.8
Peterson Caryn

EVP, Regulatory Affairs

Officer
2,377 -3.2%
12.25
US$29,118 		2,377 -3.2% 12.25 US$29,118
2021-10-26 2021-10-25 S Sale
3.0
Carter Laura

Chief Scientific Officer

Officer
2,377 -2.4%
12.25
US$29,118 		2,377 -2.4% 12.25 US$29,118
2021-03-25 2021-03-23 S Sale
3.1
Salter-Cid Luisa

Chief Scientific Officer

Officer
5,491 -2.6%
9.48
US$52,052 		5,491 -2.6% 9.48 US$52,052
2021-03-25 2021-03-23 S Sale
3.0
Giraudo Bryan

Chief Financial Officer

Officer
5,490 -4.8%
9.48
US$52,046 		5,490 -4.8% 9.48 US$52,046
2021-03-25 2021-03-23 S Sale
2.5
Christian Waage

EVP & General Counsel

Officer
5,490 -0.9%
9.48
US$52,051 		5,490 -0.9% 9.48 US$52,051
2020-10-14 2020-10-14 B Purchase
3.0
Giraudo Bryan

Chief Financial Officer

Officer
3,000 +72.8%
10.01
US$30,036 		3,000 +72.8% 10.01 US$30,036
2020-10-14 2020-10-14 B Purchase
2.7
Hasnain Faheem
Non-Executive Director
96,520 +2.9%
10.36
US$999,995 		96,520 +2.9% 10.36 US$999,995
2020-10-14 2020-10-14 B Purchase
2.5
Christian Waage

EVP & General Counsel

Officer
2,500 +56.1%
9.53
US$23,818 		2,500 +56.1% 9.53 US$23,818
2020-06-23 2020-06-23 B Purchase
3.0
Giraudo Bryan

Chief Financial Officer

Officer
2,000 +94.3%
12.96
US$25,922 		2,000 +94.3% 12.96 US$25,922
2019-12-31 2019-12-30 S Sale Dupont Jakob

Chief Medical Officer

Officer
40,000 -100.0%
15.00
US$600,004 		40,000 -100.0% 15.00 US$600,004
2019-12-31 2019-12-27 S Sale Dupont Jakob

Chief Medical Officer

Officer
1,994 -100.0%
15.81
US$31,534 		1,994 -100.0% 15.81 US$31,534
2019-09-27 2019-09-27 B Purchase
2.5
Christian Waage

EVP & General Counsel
1,000 +29.0%
16.65
US$16,654 		1,000 +29.0% 16.65 US$16,654
2019-09-27 2019-09-27 B Purchase
1.6
Gujrathi Sheila

President & CEO

Executive Director
10,000 +0.2%
16.80
US$167,980 		10,000 +0.2% 16.80 US$167,980
2019-09-27 2019-09-27 B Purchase
2.7
Hasnain Faheem
10,000 +0.3%
16.80
US$167,980 		10,000 +0.3% 16.80 US$167,980
2019-09-26 2019-09-26 B Purchase
3.0
Giraudo Bryan

Chief Financial Officer
1,121 +112.1%
16.78
US$18,810 		1,121 +112.1% 16.78 US$18,810
2019-09-23 2019-09-20 S Sale
4.2
Omega Fund V, L.P.
Large shareholder
183,607 -2.7%
21.96
US$4,032,561 		183,607 -2.7% 21.96 US$4,032,561
2019-09-18 2019-09-18 S Sale
4.2
Omega Fund V, L.P.

Former director.

Large shareholder
45,600 -0.7%
21.88
US$997,637 		45,600 -0.7% 21.88 US$997,637
2019-09-18 2019-09-17 S Sale
4.2
Omega Fund V, L.P.

Former director.

Large shareholder
23,400 -0.3%
21.62
US$505,791 		23,400 -0.3% 21.62 US$505,791
2019-09-18 2019-09-16 S Sale
4.2
Omega Fund V, L.P.

Former director.

Large shareholder
13,213 -0.2%
21.52
US$284,331 		13,213 -0.2% 21.52 US$284,331
2019-09-12 2019-09-11 S Sale
4.2
Omega Fund V, L.P.
Large shareholder
80,403 -1.2%
21.31
US$1,713,629 		80,403 -1.2% 21.31 US$1,713,629
2019-09-12 2019-09-10 S Sale
4.2
Omega Fund V, L.P.
Large shareholder
32,373 -0.5%
21.00
US$679,865 		32,373 -0.5% 21.00 US$679,865
2019-09-09 2019-09-06 S Sale
4.2
Omega Fund V, L.P.
Large shareholder
8,700 -0.1%
21.51
US$187,103 		8,700 -0.1% 21.51 US$187,103
2019-09-09 2019-09-05 S Sale
4.2
Omega Fund V, L.P.
Large shareholder
12,704 -0.2%
21.60
US$274,434 		12,704 -0.2% 21.60 US$274,434
2019-08-29 2019-08-29 S Sale
2.3
Salter-Cid Luisa

Chief Scientific Officer

Officer
26,252 -17.5%
20.09
US$527,319 		26,252 -17.5% 20.09 US$527,319
2019-08-29 2019-08-28 S Sale Salter-Cid Luisa

Chief Scientific Officer

Officer
23,748 -13.6%
19.65
US$466,724 		23,748 -13.6% 19.65 US$466,724
2019-06-03 2019-05-30 B Purchase
3.0
Giraudo Bryan

Chief Financial Officer
1,000 +inf%
18.70
US$18,700 		1,000 +inf% 18.70 US$18,700
2019-02-12 2019-02-12 B Purchase
2.5
Christian Waage

EVP & General Counsel

Officer
1,550 +0.3%
16.00
US$24,800 		1,550 +0.3% 16.00 US$24,800
2019-02-12 2019-02-12 B Purchase
Cox Russell J.
Non-Executive Director
7,200 +inf%
16.00
US$115,200 		7,200 +inf% 16.00 US$115,200
2019-02-12 2019-02-12 B Purchase
3.0
Giraudo Bryan

Chief Financial Officer

Officer
6,000 +33.6%
16.00
US$96,000 		6,000 +33.6% 16.00 US$96,000
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