Gossamer Bio, Inc. has 18 Schedule 13D or 13G filings on record since 2025-07-17. 5 holders' latest filing reports 5% or more of common stock, $0.0001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 683 Capital Management, LLC | 9.99% | 49,868,571 | SCHEDULE 13G, 2026-06-11 | 2026-06-04 |
| Context Capital Management, LLC | 9.9% | 48,835,788 | SCHEDULE 13G, 2026-06-09 | 2026-06-04 |
| DeepCurrents Investment Group LLC | 7.7% | 37,665,073 | SCHEDULE 13G, 2026-06-11 | 2026-06-04 |
| D. E. Shaw & Co., L.P. | 6% | 29,128,194 | SCHEDULE 13D/A, 2026-08-24 | 2026-08-20 |
| Opaleye Management Inc. | 5.1% | 24,942,565 | SCHEDULE 13G, 2026-07-29 | 2026-07-22 |
| Octagon Capital Advisors LP | 3.8% | 8,976,054 | SCHEDULE 13G/A, 2026-05-14 | 2026-03-31 |
| Growth Equity Opportunities 18 VGE, LLC | 1.7% | 4,065,134 | SCHEDULE 13D/A, 2026-02-24 | 2026-02-23 |
| BlackRock, Inc. | 1% | 4,890,593 | SCHEDULE 13G/A, 2026-07-29 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
Purpose of Transaction (Item 4)
Growth Equity Opportunities 18 VGE, LLC
On February 23, 2026, GEO completed open market sales as part of a series of public sales whereby GEO sold in the aggregate 17,093,034 shares of Common stock at a weighted average price of $0.3906 per share, with prices that ranged from $0.3320 to $0.6363 per share. GEO undertakes to provide to the staff of the Securities and Exchange Commission (the "SEC"), upon request, full information regarding the number of shares sold at each separate price within the range set forth in the previous sentence.Item 4 of the SCHEDULE 13D/A filed 2026-02-24
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-17 | BlackRock, Inc. | 5.3% | SCHEDULE 13G |
| 2025-07-29 | The Vanguard Group | 5.02% | SCHEDULE 13G |
| 2026-01-21 | BlackRock, Inc. | 6.5% | SCHEDULE 13G/A |
| 2026-02-17 | Octagon Capital Advisors LP | 6.5% | SCHEDULE 13G/A |
| 2026-02-24 | Growth Equity Opportunities 18 VGE, LLC | 1.7% | SCHEDULE 13D/A |
| 2026-03-02 | 683 Capital Management, LLC | 5.23% | SCHEDULE 13G |
| 2026-03-24 | 683 Capital Management, LLC | 3.9% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-05-14 | Octagon Capital Advisors LP | 3.8% | SCHEDULE 13G/A |
| 2026-06-09 | Context Capital Management, LLC | 9.9% | SCHEDULE 13G |
| 2026-06-11 | DeepCurrents Investment Group LLC | 7.7% | SCHEDULE 13G |
| 2026-06-11 | D. E. Shaw & Co., L.P. | 9.5% | SCHEDULE 13D |
| 2026-06-11 | 683 Capital Management, LLC | 9.99% | SCHEDULE 13G |
| 2026-07-01 | D. E. Shaw & Co., L.P. | 8.3% | SCHEDULE 13D/A |
| 2026-07-24 | D. E. Shaw & Co., L.P. | 7.1% | SCHEDULE 13D/A |
| 2026-07-29 | Opaleye Management Inc. | 5.1% | SCHEDULE 13G |
| 2026-07-29 | BlackRock, Inc. | 1% | SCHEDULE 13G/A |
| 2026-08-24 | D. E. Shaw & Co., L.P. | 6% | SCHEDULE 13D/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.