United States Biotechnology & Medical Research

Gossamer Bio Inc (GOSS)

Track

The most recent insider trading activity occurred on August 19, 2025, when Sandra Milligan executed a purchase. Prior to this, various executives engaged in both buying and selling shares throughout 2024 and 2023. Given that these transactions date back more than three months, no assessment regarding current market performance or recent price movements is provided.
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.

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Top insiders
Trades
Buy 19 Aug 2025
Value US$2,197,475.10 | Price 435.02 | Shares 37,803 (-40.0%)
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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
2.6
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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