D. E. Shaw is actively reducing its position while retaining voting power through the October 27 special meeting. The continued selling, combined with the correction of an understated stake, suggests the activist is de-escalating. Monitor the special meeting outcome and any further 13D amendments for additional selling or a change in purpose.
Price Chart
Executive Summary
D. E. Shaw filed Amendment No. 5 to its Schedule 13D for Gossamer Bio, primarily to correct an understatement of voting power and beneficial ownership in the prior amendment. The filing reveals that D. E. Shaw retains voting power over shares it has already sold due to custodial measures tied to the upcoming October 27, 2026 special meeting, and continues to sell shares in the open market. The corrected stake is 6.0% (369,459 shares), down from the previously reported level, signaling ongoing de-escalation despite the technical correction.
Key Financial Metrics
Key Facts
- D. E. Shaw's beneficial ownership is corrected to 6.0% of Gossamer Bio's outstanding common stock, representing 369,459 shares.
- The amendment corrects an inadvertent understatement of voting power and beneficial ownership in Amendment No. 4, triggered by a review of ballots for the October 27, 2026 special meeting.
- D. E. Shaw retains voting power over shares already sold due to custodial account measures in place as of the September 14, 2026 record date.
- Since Amendment No. 4, D. E. Shaw entities Valence and Cogence have sold a total of approximately 27,000 shares in the open market at prices ranging from $9.87 to $12.30 per share.
- The filing references a Transaction Support Agreement and Voting Agreement dated May 18, 2026, and an Indenture for Senior Secured First Lien Convertible Notes due 2030.
- A new director, Gregory A. Ciongoli (founder of Adiumentum Capital Management), was appointed to the board on September 16, 2026, and was a purchaser in the August 2026 PIPE.
Financial Impact
D. E. Shaw's stake is valued at approximately $3.6 million based on a ~$9.80 share price, but the ongoing selling pressure and reduced ownership are the key signals.
Risk Factors
- D. E. Shaw may continue to sell shares post-meeting, further pressuring the stock.
- The special meeting outcome could trigger additional selling or a change in activist strategy.
- The company's fundamentals (pre-revenue biotech with cash runway concerns) remain weak, as indicated by the 2025 10-K.
Investment Themes
Documents Analyzed
This report is based on 7 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13D/A Filing (Primary) | 0001104659-26-114792 |
| Document: tm2627334d1_ex99-4.htm | 0001104659-26-114792 |
| Document: tm2627334d1_ex99-3.htm | 0001104659-26-114792 |
| Document: tm2627334d1_ex99-2.htm | 0001104659-26-114792 |
| Document: 0001104659-26-114792-index-headers.html | 0001104659-26-114792 |
| Document: 0001104659-26-114792-index.html | 0001104659-26-114792 |
| Document: 0001104659-26-114792.txt | 0001104659-26-114792 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 8, 2026 18d ago | SC 13D/A | $9.31 | awaiting T+20 | — | $9.15 (+1.72%) |
Sep 28, 2026 28d 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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