Gossamer Bio Inc (GOSS)

The most recent insider trading activity at Gossamer Bio Inc occurred on August 19, 2025, when Sandra Milligan executed a purchase. Given that this transaction took place over three months ago, there is no current activity to report regarding recent market movements or the company's latest results.
Ticker: GOSS 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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Insider trades have triggered activity signals for Gossamer Bio Inc. Upgrade to see score, net flow, insiders and the full signal context.

Top insiders
Trades
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
3.9
Milligan Sandra Non-Executive Director
Transaction date
Purchase
Price
435.02
Quantity 37,803 -40.0%
Value US$2,197,475
3.8
Aranda Richard Chief Medical Officer Officer
Transaction date
Sale
Price
231.67
Quantity 37,910 -25.1%
Value US$4,797,732
2.7
Hasnain Faheem President & CEO Executive Director
Transaction date
Purchase
Price
85.12
Quantity 68,949 +40.8%
Value US$3,024,149
2.3
Giraudo Bryan COO/CFO Officer
Transaction date
Purchase
Price
0.59
Quantity 100,000 +26.3%
Value US$59,110
3.3
Smith Robert Paul JR Chief Commercial Officer Officer
Transaction date
Purchase
Price
0.60
Quantity 25,000 New position
Value US$15,050
2.7
Hasnain Faheem President & CEO Executive Director
Transaction date
Sale
Price
1.16
Quantity 23,172 -16.2%
Value US$26,773
2.5
Christian Waage EVP, Tech Ops and Admin Officer
Transaction date
Sale
Price
1.16
Quantity 6,430 -1.1%
Value US$7,430
2.3
Giraudo Bryan COO/CFO Officer
Transaction date
Sale
Price
1.16
Quantity 6,430 -6.5%
Value US$7,431
3.8
Peterson Caryn EVP, Regulatory Affairs Officer
Transaction date
Sale
Price
1.33
Quantity 4,018 -7.5%
Value US$5,343
3.8
Aranda Richard Chief Medical Officer Officer
Transaction date
Sale
Price
1.33
Quantity 4,018 -2.0%
Value US$5,342
3.9
Milligan Sandra Non-Executive Director
Transaction date
Purchase
Price
0.79
Quantity 32,000 New position
Value US$25,213
2.3
Giraudo Bryan COO/CFO Officer
Transaction date
Purchase
Price
0.56
Quantity 200,000 +111.1%
Value US$112,880
3.8
Aranda Richard Chief Medical Officer Officer
Transaction date
Sale
Price
1.29
Quantity 1,814 -0.9%
Value US$2,340
2.3
Giraudo Bryan COO/CFO Officer
Transaction date
Purchase
Price
1.02
Quantity 55,000 +77.5%
Value US$56,094
2.7
Hasnain Faheem President & CEO Executive Director
Transaction date
Purchase
Price
1.14
Quantity 440,500 +10.9%
Value US$503,580
2.7
Hasnain Faheem President & CEO Executive Director
Transaction date
Purchase
Price
1.20
Quantity 269,389 +7.1%
Value US$322,324
2.3
Giraudo Bryan COO/CFO Officer
Transaction date
Purchase
Price
0.97
Quantity 50,000 +238.2%
Value US$48,435
2.7
Hasnain Faheem President & CEO Executive Director
Transaction date
Purchase
Price
1.03
Quantity 168,683 +4.7%
Value US$174,486
2.5
Christian Waage EVP, Tech Ops and Admin Officer
Transaction date
Purchase
Price
1.20
Quantity 18,500 +133.2%
Value US$22,144
3.0
Carter Laura Chief Scientific Officer Officer
Transaction date
Sale
Price
1.10
Quantity 6,029 -7.3%
Value US$6,620
3.8
Peterson Caryn EVP, Regulatory Affairs Officer
Transaction date
Sale
Price
1.10
Quantity 7,564 -12.3%
Value US$8,305
3.8
Aranda Richard Chief Medical Officer Officer
Transaction date
Sale
Price
1.10
Quantity 7,563 -3.7%
Value US$8,304
3.0
Carter Laura Chief Scientific Officer Officer
Transaction date
Sale
Price
12.07
Quantity 4,876 -5.6%
Value US$58,868
3.8
Aranda Richard Chief Medical Officer Officer
Transaction date
Sale
Price
12.07
Quantity 4,757 -2.3%
Value US$57,431
3.8
Peterson Caryn EVP, Regulatory Affairs Officer
Transaction date
Sale
Price
12.07
Quantity 4,757 -7.2%
Value US$57,431
2.3
Giraudo Bryan COO/CFO Officer
Transaction date
Purchase
Price
7.21
Quantity 13,869 +194.8%
Value US$99,995
2.5
Christian Waage EVP, Tech Ops and Admin Officer
Transaction date
Purchase
Price
7.21
Quantity 6,934 +99.7%
Value US$49,994
2.7
Hasnain Faheem President & CEO Executive Director
Transaction date
Purchase
Price
7.21
Quantity 138,696 +4.0%
Value US$999,998
3.0
Carter Laura Chief Scientific Officer Officer
Transaction date
Purchase
Price
7.21
Quantity 6,934 +8.6%
Value US$49,994
3.0
Carter Laura Chief Scientific Officer Officer
Transaction date
Sale
Price
8.25
Quantity 8,808 -9.9%
Value US$72,648
3.8
Aranda Richard Chief Medical Officer Officer
Transaction date
Sale
Price
6.88
Quantity 1,778 -0.8%
Value US$12,233
3.0
Carter Laura Chief Scientific Officer Officer
Transaction date
Sale
Price
7.20
Quantity 1,262 -1.4%
Value US$9,086
2.7
Hasnain Faheem President & CEO Executive Director
Transaction date
Sale
Price
8.92
Quantity 19,035 -11.7%
Value US$169,697
2.3
Giraudo Bryan COO/CFO Officer
Transaction date
Sale
Price
8.92
Quantity 10,722 -9.8%
Value US$95,587
2.5
Christian Waage EVP, Tech Ops and Admin Officer
Transaction date
Sale
Price
8.92
Quantity 10,722 -1.8%
Value US$95,587
3.8
Peterson Caryn EVP, Regulatory Affairs Officer
Transaction date
Sale
Price
8.28
Quantity 6,279 -8.7%
Value US$51,978
3.0
Carter Laura Chief Scientific Officer Officer
Transaction date
Sale
Price
8.28
Quantity 5,002 -5.2%
Value US$41,407
3.8
Aranda Richard Chief Medical Officer Officer
Transaction date
Sale
Price
8.28
Quantity 6,278 -2.9%
Value US$51,976
3.8
Aranda Richard Chief Medical Officer Officer
Transaction date
Sale
Price
12.25
Quantity 2,377 -1.1%
Value US$29,118
3.8
Peterson Caryn EVP, Regulatory Affairs Officer
Transaction date
Sale
Price
12.25
Quantity 2,377 -3.2%
Value US$29,118
3.0
Carter Laura Chief Scientific Officer Officer
Transaction date
Sale
Price
12.25
Quantity 2,377 -2.4%
Value US$29,118
3.1
Salter-Cid Luisa Chief Scientific Officer Officer
Transaction date
Sale
Price
9.48
Quantity 5,491 -2.6%
Value US$52,052
2.3
Giraudo Bryan Chief Financial Officer Officer
Transaction date
Sale
Price
9.48
Quantity 5,490 -4.8%
Value US$52,046
2.5
Christian Waage EVP & General Counsel Officer
Transaction date
Sale
Price
9.48
Quantity 5,490 -0.9%
Value US$52,051
2.3
Giraudo Bryan Chief Financial Officer Officer
Transaction date
Purchase
Price
10.01
Quantity 3,000 +72.8%
Value US$30,036
2.7
Hasnain Faheem Non-Executive Director
Transaction date
Purchase
Price
10.36
Quantity 96,520 +2.9%
Value US$999,995
2.5
Christian Waage EVP & General Counsel Officer
Transaction date
Purchase
Price
9.53
Quantity 2,500 +56.1%
Value US$23,818
2.3
Giraudo Bryan Chief Financial Officer Officer
Transaction date
Purchase
Price
12.96
Quantity 2,000 +94.3%
Value US$25,922
Dupont Jakob Chief Medical Officer Officer
Transaction date
Sale
Price
15.00
Quantity 40,000 -100.0%
Value US$600,004
Dupont Jakob Chief Medical Officer Officer
Transaction date
Sale
Price
15.81
Quantity 1,994 -100.0%
Value US$31,534
2.5
Christian Waage EVP & General Counsel
Transaction date
Purchase
Price
16.65
Quantity 1,000 +29.0%
Value US$16,654
1.6
Gujrathi Sheila President & CEO Executive Director
Transaction date
Purchase
Price
16.80
Quantity 10,000 +0.2%
Value US$167,980
Transaction date
Purchase
Price
16.80
Quantity 10,000 +0.3%
Value US$167,980
2.3
Giraudo Bryan Chief Financial Officer
Transaction date
Purchase
Price
16.78
Quantity 1,121 +112.1%
Value US$18,810
4.2
Omega Fund V, L.P. Large shareholder
Transaction date
Sale
Price
21.96
Quantity 183,607 -2.7%
Value US$4,032,561
4.2
Omega Fund V, L.P. Former director. Large shareholder
Transaction date
Sale
Price
21.88
Quantity 45,600 -0.7%
Value US$997,637
4.2
Omega Fund V, L.P. Former director. Large shareholder
Transaction date
Sale
Price
21.62
Quantity 23,400 -0.3%
Value US$505,791
4.2
Omega Fund V, L.P. Former director. Large shareholder
Transaction date
Sale
Price
21.52
Quantity 13,213 -0.2%
Value US$284,331
4.2
Omega Fund V, L.P. Large shareholder
Transaction date
Sale
Price
21.31
Quantity 80,403 -1.2%
Value US$1,713,629
4.2
Omega Fund V, L.P. Large shareholder
Transaction date
Sale
Price
21.00
Quantity 32,373 -0.5%
Value US$679,865
4.2
Omega Fund V, L.P. Large shareholder
Transaction date
Sale
Price
21.51
Quantity 8,700 -0.1%
Value US$187,103
4.2
Omega Fund V, L.P. Large shareholder
Transaction date
Sale
Price
21.60
Quantity 12,704 -0.2%
Value US$274,434
2.3
Salter-Cid Luisa Chief Scientific Officer Officer
Transaction date
Sale
Price
20.09
Quantity 26,252 -17.5%
Value US$527,319
Salter-Cid Luisa Chief Scientific Officer Officer
Transaction date
Sale
Price
19.65
Quantity 23,748 -13.6%
Value US$466,724
2.3
Giraudo Bryan Chief Financial Officer
Transaction date
Purchase
Price
18.70
Quantity 1,000 New position
Value US$18,700
2.5
Christian Waage EVP & General Counsel Officer
Transaction date
Purchase
Price
16.00
Quantity 1,550 +0.3%
Value US$24,800
Cox Russell J. Non-Executive Director
Transaction date
Purchase
Price
16.00
Quantity 7,200 New position
Value US$115,200
2.3
Giraudo Bryan Chief Financial Officer Officer
Transaction date
Purchase
Price
16.00
Quantity 6,000 +33.6%
Value US$96,000
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 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

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

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

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

Chief Commercial Officer

Officer
25,000 New position
0.60
US$15,050
25,000 New position 0.60 US$15,050
2024-03-28 2024-03-27 S Sale

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

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

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

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

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 Non-Executive Director
32,000 New position
0.79
US$25,213
32,000 New position 0.79 US$25,213
2023-11-14 2023-11-13 B Purchase

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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 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

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

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

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

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
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

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 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

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

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

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 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 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 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 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

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

Chief Financial Officer

1,000 New position
18.70
US$18,700
1,000 New position 18.70 US$18,700
2019-02-12 2019-02-12 B Purchase

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 Non-Executive Director
7,200 New position
16.00
US$115,200
7,200 New position 16.00 US$115,200
2019-02-12 2019-02-12 B Purchase

Chief Financial Officer

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