Gossamer Bio, Inc. (GOSS) Insider Trading
Directors, officers and holders of more than 10% of GOSS report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 165 transactions on file: 0 with code P, 0 with code S and 50 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 23, 2026 | Milligan Sandra | Director | A Award | 10,000 | Not measured | Not measured |
| Sep 23, 2026 | Drynan Skye | Director | A Award | 10,000 | Not measured | Not measured |
| Sep 23, 2026 | Daniel Thomas O | Director | A Award | 10,000 | Not measured | Not measured |
| Sep 23, 2026 | Nathan Steven D | Director | A Award | 10,000 | Not measured | Not measured |
| Sep 23, 2026 | Ciongoli Gregory Austin | Director | A Award | 30,000 | Not measured | Not measured |
| Sep 23, 2026 | Quisel John D | Director | A Award | 10,000 | Not measured | Not measured |
| Sep 23, 2026 | Cox Russell J. | Director | A Award | 10,000 | Not measured | Not measured |
| Aug 24, 2026 | Giraudo Bryan | COO/CFO | A Award | 5,800,051 | Not measured | Not measured |
| Aug 24, 2026 | Peterson Caryn | Chief Development Officer | A Award | 5,800,051 | Not measured | Not measured |
| Aug 24, 2026 | Hasnain Faheem | President & CEO | A Award | 5,800,051 | Not measured | Not measured |
| Aug 24, 2026 | Smith Robert Paul JR | Chief Commercial Officer | A Award | 5,800,051 | Not measured | Not measured |
| Aug 24, 2026 | Hasnain Faheem | President & CEO | A Award | 166 | $1000.00 | $166,000 |
| Aug 24, 2026 | Christian Waage | EVP, Tech Ops and Admin | A Award | 2,900,026 | Not measured | Not measured |
| Aug 24, 2026 | Giraudo Bryan | COO/CFO | A Award | 25 | $1000.00 | $25,000 |
| Jun 4, 2026 | Drynan Skye | Director | A Award | 115,000 | Not measured | Not measured |
| Jun 4, 2026 | Daniel Thomas O | Director | A Award | 115,000 | Not measured | Not measured |
| Jun 4, 2026 | Quisel John D | Director | A Award | 115,000 | Not measured | Not measured |
| Jun 4, 2026 | Nathan Steven D | Director | A Award | 115,000 | Not measured | Not measured |
| Jun 4, 2026 | Milligan Sandra | Director | A Award | 115,000 | Not measured | Not measured |
| Jun 4, 2026 | Cox Russell J. | Director | A Award | 115,000 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | A Award | 157,500 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | A Award | 125,000 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | A Award | 157,500 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 162,500 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 126,667 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | D Disposition | 157,500 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 157,500 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 157,500 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 30,000 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | D Disposition | 506,250 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | D Disposition | 126,667 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | D Disposition | 21,167 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | A Award | 126,667 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 20,000 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 40,000 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | D Disposition | 375,000 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 22,784 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | D Disposition | 157,500 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | D Disposition | 157,500 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 9,167 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | D Disposition | 126,667 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | D Disposition | 20,000 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | D Disposition | 40,000 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | D Disposition | 22,784 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | D Disposition | 9,167 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | D Disposition | 30,000 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 562,500 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 572,000 | Not measured | Not measured |
| Mar 19, 2026 | Aranda Richard | Chief Medical Officer | A Award | 487,500 | Not measured | Not measured |
| Mar 19, 2026 | Peterson Caryn | Chief Development Officer | D Disposition | 125,000 | Not measured | Not measured |
The full Form 4 history is on the GOSS company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.