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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
Milligan Sandra
19 Aug 2025
Director
Buy
26,050
$1.92
$50.02K
Hasnain Faheem
21 Jun 2024
President & CEO
Buy indirect
372,000
$0.67
$250.28K
Giraudo Bryan
18 Jun 2024
COO/CFO
Buy indirect
100,000
$0.59
$59.11K
Smith Robert Paul JR
17 Jun 2024
Chief Commercial Officer
Buy indirect
25,000
$0.60
$15.05K
Milligan Sandra
15 Nov 2023
Director
Buy indirect
32,000
$0.79
$25.21K
Giraudo Bryan
13 Nov 2023
COO/CFO
Buy indirect
200,000
$0.56
$112.88K
Giraudo Bryan
4 Apr 2023
COO/CFO
Buy indirect
55,000
$1.02
$56.09K
Hasnain Faheem
22 Mar 2023
President & CEO
Buy indirect
440,500
$1.14
$503.58K
Hasnain Faheem
21 Mar 2023
President & CEO
Buy indirect
269,389
$1.20
$322.32K
Hasnain Faheem
20 Mar 2023
President & CEO
Buy indirect
168,683
$1.03
$174.49K
Giraudo Bryan
20 Mar 2023
COO/CFO
Buy indirect
50,000
$0.97
$48.44K
Christian Waage
20 Mar 2023
EVP, Tech Ops and Admin
Buy indirect
18,500
$1.20
$22.14K
Hasnain Faheem
15 Jul 2022
President & CEO
Buy indirect
138,696
$7.21
$1,000.00K
Giraudo Bryan
15 Jul 2022
COO/CFO
Buy indirect
13,869
$7.21
$100.00K
Christian Waage
15 Jul 2022
EVP, Tech Ops and Admin
Buy indirect
6,934
$7.21
$49.99K
Carter Laura
15 Jul 2022
Chief Scientific Officer
Buy
6,934
$7.21
$49.99K
Giraudo Bryan
14 Oct 2020
Chief Financial Officer
Buy indirect
3,000
$10.01
$30.04K
Hasnain Faheem
14 Oct 2020
Director
Buy indirect
96,520
$10.36
$1,000.00K
Christian Waage
14 Oct 2020
EVP & General Counsel
Buy indirect
2,500
$9.53
$23.82K
Giraudo Bryan
23 Jun 2020
Chief Financial Officer
Buy indirect
2,000
$12.96
$25.92K
Gujrathi Sheila
27 Sep 2019
President & CEO
Buy indirect
10,000
$16.80
$167.98K
Hasnain Faheem
27 Sep 2019
Director
Buy indirect
10,000
$16.80
$167.98K
Christian Waage
27 Sep 2019
EVP & General Counsel
Buy indirect
1,000
$16.65
$16.65K
Giraudo Bryan
26 Sep 2019
Chief Financial Officer
Buy indirect
1,121
$16.78
$18.81K
Giraudo Bryan
30 May 2019
Chief Financial Officer
Buy indirect
1,000
$18.70
$18.70K
Giraudo Bryan
12 Feb 2019
Chief Financial Officer
Buy
6,000
$16.00
$96.00K
Christian Waage
12 Feb 2019
EVP & General Counsel
Buy
1,550
$16.00
$24.80K
Cox Russell J.
12 Feb 2019
Director
Buy
7,200
$16.00
$115.20K

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