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Gossamer Bio, Inc.

GOSS Net selling
CIK 0001728117 #4496 in the set updated 21 Sep 2026
Bought (120 mo)
$4.55M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$11.40M
$0.00 on a plan · $631.54K straight out of an exercise
Sold at will
$10.77M
38 of 40 sales
Net
−$6.85M
−$6.22M against sales at will

By person

16 insiders · 68 transactions
28.7×

Faheem Hasnain holds 28.7 times base salary in stock. $18.67M of shares against $649.65K in salary for 2025.

Salary from the company's own proxy. The shares are what Faheem Hasnain last reported holding, valued at $1.92, the price Common Stock was last bought or sold at on the open market here, on 19 Aug 2025.

Insider
Role
Bought
Sold
Net
Holding
Worth
Change
Omega Fund V, L.P. entity
10% owner
$8.68M (8)
−$8.68M
13,506,832
$25.93M
+94.2%
Hasnain Faheem
President & CEO
$3.42M (7)
$196.47K (2)
+$3.22M
9,724,495
$18.67M
+43.2%
Salter-Cid Luisa
Chief Scientific Officer
$1.05M (3)
−$1.05M
206,065
$395.64K
+18.4%
Dupont Jakob
Chief Medical Officer
$631.54K (2) scheduled
−$631.54K
46,500
$89.28K
Giraudo Bryan
COO/CFO
$565.98K (10)
$155.06K (3)
+$410.92K
876,868
$1.68M
+12,214%
Aranda Richard
Chief Medical Officer
$168.00K (8)
−$168.00K
463,106
$889.16K
+108.3%
Gujrathi Sheila
President & CEO
$167.98K (1)
+$167.98K
4,237,742
$8.14M
+6.6%
Carter Laura
Chief Scientific Officer
$49.99K (1)
$217.75K (6)
−$167.75K
76,263
$146.42K
+23.3%
Peterson Caryn
Chief Development Officer
$152.18K (5)
−$152.18K
259,333
$497.92K
+305.2%
Cox Russell J.
Director
$115.20K (1)
+$115.20K
7,200
$13.82K
Milligan Sandra
Director
$75.23K (2)
+$75.23K
90,050
$172.90K
+181.4%
Christian Waage
EVP, Tech Ops and Admin
$137.41K (5)
$155.07K (3)
−$17.66K
889,129
$1.71M
+57.8%
Smith Robert Paul JR
Chief Commercial Officer
$15.05K (1)
+$15.05K
285,898
$548.92K
+6,051%
Burow Kristina
Director
4,027,958
$7.73M
ARCH Venture Partners IX, LLC entity
10% owner
4,027,958
$7.73M
Daniel Thomas O
Director
38,095
$73.14K

No percentages here. This company's share count has moved by a factor of 2.2 over the window, from 226,604,137 to 488,846,722 shares. A split, a merger or a large issue changes what the company is, and a holding measured at one point in that run is not a fraction of it at another.

Insider
Date
Role
Action
Shares
Price
Amount
Aranda Richard
24 Jun 2024
Chief Medical Officer
Sell
1,908
$0.66
$1.26K
Hasnain Faheem
27 Mar 2024
President & CEO
Sell
23,172
$1.16
$26.77K
Giraudo Bryan
27 Mar 2024
COO/CFO
Sell
6,430
$1.16
$7.43K
Christian Waage
27 Mar 2024
EVP, Tech Ops and Admin
Sell
6,430
$1.16
$7.43K
Peterson Caryn
18 Mar 2024
EVP, Regulatory Affairs
Sell
4,018
$1.33
$5.34K
Aranda Richard
18 Mar 2024
Chief Medical Officer
Sell
4,018
$1.33
$5.34K
Aranda Richard
22 Jun 2023
Chief Medical Officer
Sell
1,814
$1.29
$2.34K
Peterson Caryn
16 Mar 2023
EVP, Regulatory Affairs
Sell
7,564
$1.10
$8.31K
Aranda Richard
16 Mar 2023
Chief Medical Officer
Sell
7,563
$1.10
$8.30K
Carter Laura
16 Mar 2023
Chief Scientific Officer
Sell
6,029
$1.10
$6.62K
Aranda Richard
24 Oct 2022
Chief Medical Officer
Sell
4,757
$12.07
$57.43K
Carter Laura
24 Oct 2022
Chief Scientific Officer
Sell
4,876
$12.07
$58.87K
Peterson Caryn
24 Oct 2022
EVP, Regulatory Affairs
Sell
4,757
$12.07
$57.43K
Carter Laura
1 Jul 2022
Chief Scientific Officer
Sell
8,808
$8.25
$72.65K
Aranda Richard
22 Jun 2022
Chief Medical Officer
Sell
1,778
$6.88
$12.23K
Carter Laura
4 May 2022
Chief Scientific Officer
Sell
1,262
$7.20
$9.09K
Giraudo Bryan
23 Mar 2022
COO/CFO
Sell
10,722
$8.92
$95.59K
Hasnain Faheem
23 Mar 2022
President & CEO
Sell
19,035
$8.92
$169.70K
Christian Waage
23 Mar 2022
EVP, Tech Ops and Admin
Sell
10,722
$8.92
$95.59K
Aranda Richard
16 Mar 2022
Chief Medical Officer
Sell
6,278
$8.28
$51.98K
Peterson Caryn
16 Mar 2022
EVP, Regulatory Affairs
Sell
6,279
$8.28
$51.98K
Carter Laura
16 Mar 2022
Chief Scientific Officer
Sell
5,002
$8.28
$41.41K
Aranda Richard
25 Oct 2021
Chief Medical Officer
Sell
2,377
$12.25
$29.12K
Carter Laura
25 Oct 2021
Chief Scientific Officer
Sell
2,377
$12.25
$29.12K
Peterson Caryn
25 Oct 2021
EVP, Regulatory Affairs
Sell
2,377
$12.25
$29.12K
Christian Waage
23 Mar 2021
EVP & General Counsel
Sell
5,490
$9.48
$52.05K
Giraudo Bryan
23 Mar 2021
Chief Financial Officer
Sell
5,490
$9.48
$52.05K
Salter-Cid Luisa
23 Mar 2021
Chief Scientific Officer
Sell
5,491
$9.48
$52.05K
Omega Fund V, L.P.
20 Sep 2019
10% owner
Sell
183,607
$21.96
$4.03M
Omega Fund V, L.P.
18 Sep 2019
10% owner
Sell
45,600
$21.88
$997.64K
Omega Fund V, L.P.
17 Sep 2019
10% owner
Sell
23,400
$21.62
$505.79K
Omega Fund V, L.P.
16 Sep 2019
10% owner
Sell
13,213
$21.52
$284.33K
Omega Fund V, L.P.
11 Sep 2019
10% owner
Sell
80,403
$21.31
$1.71M
Omega Fund V, L.P.
10 Sep 2019
10% owner
Sell
32,373
$21.00
$679.87K
Omega Fund V, L.P.
6 Sep 2019
10% owner
Sell
8,700
$21.51
$187.10K
Omega Fund V, L.P.
5 Sep 2019
10% owner
Sell
12,704
$21.60
$274.43K
Salter-Cid Luisa
29 Aug 2019
Chief Scientific Officer
Sell
26,252
$20.09
$527.32K
Salter-Cid Luisa
28 Aug 2019
Chief Scientific Officer
Sell
23,748
$19.65
$466.72K

What was left out

Form 4 filings counted 198
Amendments (4/A) skipped 1
Filings about a different issuer 0
Unreadable filings 0
Joint filings 6
Sales on a Rule 10b5-1 plan 0
Sales straight out of an exercise 2
Sales at will 38
Transactions with no price 0
Shares from compensation/vesting 26,579,639
Sales filed before the plan box existed 28
History held since 12 Feb 2019