Total buying$00 buys
GOSS
Gossamer Bio, Inc.
NasdaqHealthcarePharmaceutical Preparations
Insider activity for last month from 09/19 to 10/19.
How these metrics are calculated
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 selling$00 sells
Net open-market+$0Buying minus selling
Active insiders7Distinct reporting owners
Insider activity report
Calendar-month buckets within the selected date range
Latest filing: Sep 25, 2026
Open-market transaction mix · 0 transactions in the selected period
Code A includes awards, grants and other acquisitions; these are not open-market buys. A rolling period can include partial calendar months.
View exact monthly counts and disclosed values
| Month | Buys | Sells | Awards (A) | Buy value | Sell value | Net P/S value |
|---|---|---|---|---|---|---|
| Sep 2026 | 0 | 0 | 7 | $0 | $0 | $0 |
| Oct 2026 | 0 | 0 | 0 | $0 | $0 | $0 |
Distinct insiders active
Reporting-owner CIKs by month · peak Sep 2026 (7)Sep 2026Oct 2026
Largest insider activity
By absolute net disclosed value · current transaction page- MS+$0
- DO+$0
- CA+$0
- DS+$0
- QD+$0
GOSS transaction history
Newest filings · 20 transactions per pageLatest insider transactions
Form 4 filings from last month.| Company | Insider | Activity | Disclosed value | Filed (ET) |
|---|---|---|---|---|
GOSSGossamer Bio, Inc. | Milligan SandraDIR | A · grantDerivative securitySEC filing ↗ | $0View disclosure → | |
GOSSGossamer Bio, Inc. | Daniel Thomas ODIR | A · grantDerivative securitySEC filing ↗ | $0View disclosure → | |
GOSSGossamer Bio, Inc. | Ciongoli Gregory AustinDIR | A · grantDerivative securitySEC filing ↗ | $0View disclosure → | |
GOSSGossamer Bio, Inc. | Drynan SkyeDIR | A · grantDerivative securitySEC filing ↗ | $0View disclosure → | |
GOSSGossamer Bio, Inc. | Quisel John DDIR | A · grantDerivative securitySEC filing ↗ | $0View disclosure → | |
GOSSGossamer Bio, Inc. | Cox Russell J.DIR | A · grantDerivative securitySEC filing ↗ | $0View disclosure → | |
GOSSGossamer Bio, Inc. | Nathan Steven DDIR | A · grantDerivative securitySEC filing ↗ | $0View disclosure → |
Filing-only signals
Deterministic matches in the selected period
Filing detail checks
Secondary metrics for the selected periodTransaction codes
By Form 4 transaction code in selected period7transactionstxns
- A · Grants / awards · dominant7 · 100%
Activity by reported role
A joint filing can contribute to multiple rolesDirector7
Reported Holdings After
Separated by insider, security, and ownership type
Nathan Steven DStock Option (Right to Buy) · Direct
10,000Sep 23, 2026
Cox Russell J.Stock Option (Right to Buy) · Direct
10,000Sep 23, 2026
Quisel John DStock Option (Right to Buy) · Direct
10,000Sep 23, 2026
Drynan SkyeStock Option (Right to Buy) · Direct
10,000Sep 23, 2026
Ciongoli Gregory AustinStock Option (Right to Buy) · Direct
30,000Sep 23, 2026
Daniel Thomas OStock Option (Right to Buy) · Direct
10,000Sep 23, 2026
Milligan SandraStock Option (Right to Buy) · Direct
10,000Sep 23, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Current transaction page only · each cell is a filing date · buys green, sells redSep 19 → Oct 19
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Gossamer Bio, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Gossamer Bio, Inc.?
Milligan Sandra, Daniel Thomas O, Ciongoli Gregory Austin, Drynan Skye, Quisel John D, Cox Russell J., Nathan Steven D.
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.