Monitor for further activist activity or board-level changes, as Ciongoli's appointment follows activist 13D filings and may signal a shift in governance or strategic direction. The activist entities have been net sellers of GOSS shares over the past 60 days, which could indicate a lack of conviction or a strategic exit.
Price Chart
Executive Summary
Gossamer Bio appointed Gregory A. Ciongoli to its Board of Directors as a Class III director and Audit Committee member, effective September 16, 2026. Ciongoli is the founder of Adiumentum Capital Management and a recent participant in the company's August 2026 PIPE, purchasing pre-funded warrants convertible into common stock. This appointment follows recent activist 13D filings and a reverse stock split, signaling potential board-level influence from an activist-aligned investor.
Key Facts
- Gregory A. Ciongoli appointed to the Board of Directors as Class III director, effective September 16, 2026.
- Ciongoli also appointed to the Audit Committee.
- Ciongoli is Founder and Managing Partner of Adiumentum Capital Management (since April 2024) and was a Partner at Baupost Group (2007-2024).
- Ciongoli was a purchaser in the August 2026 PIPE, acquiring pre-funded warrants exercisable for up to ~22,337 shares (initial closing), ~111,687 shares (second closing), and ~66,845 shares (FDA approval warrants), post-1-for-80 reverse split.
- Board determined Ciongoli's initial equity award will be made at a future date and amount to be determined.
- Ciongoli will receive an annual cash retainer of $40,000 for Board service and $7,500 for Audit Committee service.
- Two SC 13D/A filings from activist Cogence/Valence/DESIM entities were filed within 60 days prior, showing consistent selling of shares from July through August 2026.
Financial Impact
No material financial impact from the board appointment itself; Ciongoli's PIPE participation (pre-funded warrants for up to ~200,859 common shares post-split) represents a prior capital infusion, but the exact dollar amount is not disclosed in this filing.
Risk Factors
- Activist entities (Cogence, Valence, DESIM) have been consistently selling GOSS shares over the past two months, potentially signaling reduced confidence.
- Ciongoli's initial equity award amount and timing are deferred, creating uncertainty about his incentive alignment.
- The company executed a 1-for-80 reverse stock split on September 10, 2026, which may indicate prior stock price distress.
Investment Themes
Documents Analyzed
This report is based on 5 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 8-K Filing (Primary) | 0001728117-26-000101 |
| Exhibit: ex991pr-newdirector.htm | 0001728117-26-000101 |
| Document: 0001728117-26-000101-index-headers.html | 0001728117-26-000101 |
| Document: 0001728117-26-000101-index.html | 0001728117-26-000101 |
| Document: 0001728117-26-000101.txt | 0001728117-26-000101 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 8, 2026 17d ago | SC 13D/A | $9.31 | awaiting T+20 | — | $9.15 (+1.72%) |
Sep 28, 2026 27d ago | SC 13D/A | $11.58 | awaiting T+20 | — | $9.15 (+20.98%) |
Sep 22, 2026 4w ago | Institutional Cluster | $11.69 $9.58 | ▼ −18.05% | ▼ −17.49% | $9.15 (−21.73%) |
Sep 16, 2026 5w ago | 8-K | $11.94 $8.89 | ▼ −25.54% | ▼ −26.75% | $9.15 (−23.37%) |
Sep 11, 2026 6w ago | 8-K | $10.73 $9.31 | ▲ +13.23% | ▲ +15.10% | $9.15 (+14.73%) |
Sep 9, 2026 6w ago | 8-K | $0.1597 $0.1273 | ▼ −20.32% | ▼ −22.26% | $9.15 (+5629.49%) |
Aug 21, 2026 9w ago | 8-K | $0.1547 $0.1410 | ▲ +8.86% | ▲ +9.87% | $9.15 (−5814.67%) |
Aug 13, 2026 10w ago | 8-K | $0.1542 $0.1337 | ▼ −13.26% | ▼ −11.27% | $9.15 (+5833.85%) |
Jul 1, 2026 16w ago | 8-K | $0.1677 $0.1783 | ▼ −6.32% | ▼ −6.87% | $9.15 (−5356.17%) |
Jun 17, 2026 18w ago | 8-K | $0.1790 $0.1701 | ▲ +4.97% | ▲ +5.29% | $9.15 (−5011.73%) |
US Market Status
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