Latest filingAug 26, 2026Most recent Form 4
GOSS
Gossamer Bio, Inc.
NasdaqHealthcarePharmaceutical Preparations
Insider activity for last month from 08/04 to 09/04. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$00 sells
Net open-market+$05 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period7transactions
- A · Grants / awards · dominant7 · 100%
Activity by reported role
A joint filing can contribute to multiple roles12transactions
- Chief executive officer · dominant2 · 17%
- Chief financial officer2 · 17%
- COO2 · 17%
- PRES2 · 17%
- CCO1 · 8%
- CDO1 · 8%
- EVP1 · 8%
- TOA1 · 8%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (5)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeHasnain FaheemPre-Funded Warrant (Right to Buy) · Indirect · By Family Trust
166Aug 24, 2026
Hasnain FaheemStock Option (Right to Buy) · Direct
5,800,051Aug 24, 2026
Giraudo BryanStock Option (Right to Buy) · Direct
5,800,051Aug 24, 2026
Giraudo BryanPre-Funded Warrant (Right to Buy) · Indirect · By Family Trust
25Aug 24, 2026
Smith Robert Paul JRStock Option (Right to Buy) · Direct
5,800,051Aug 24, 2026
Peterson CarynStock Option (Right to Buy) · Direct
5,800,051Aug 24, 2026
Christian WaageStock Option (Right to Buy) · Direct
2,900,026Aug 24, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 04 → Sep 04
LessMore
Top insiders
By absolute net value across the selected period- HF+$166.0k
- GB+$25.0k
- CW+$0
- PC+$0
- SJ+$0
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
GOSS transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| GOSS | Christian Waage | EVPTOA | grant | 2.90M | $0 | A | — | 08/26 | 08/24 | |
| GOSS | Peterson Caryn | CDO | grant | 5.80M | $0 | A | — | 08/26 | 08/24 | |
| GOSS | Smith Robert Paul JR | CCO | grant | 5.80M | $0 | A | — | 08/26 | 08/24 | |
| GOSS | Giraudo Bryan | COOCFO | grant | 5.80M | $0 | A | — | 08/26 | 08/24 | |
| GOSS | Giraudo Bryan | COOCFO | grant | 25 | $2.49M | A | — | 08/26 | 08/24 | |
| GOSS | Hasnain Faheem | PRESCEO | grant | 5.80M | $0 | A | — | 08/26 | 08/24 | |
| GOSS | Hasnain Faheem | PRESCEO | grant | 166 | $16.5M | A | — | 08/26 | 08/24 |
Gossamer Bio, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Gossamer Bio, Inc.?
Christian Waage, Peterson Caryn, Smith Robert Paul JR, Giraudo Bryan, Hasnain Faheem.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
No code-P purchases or code-S sales were reported in the selected period.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.