RA Capital's new 9.9% passive stake signals conviction in CRBP's pipeline prospects. Monitor for any future conversion to a 13D (activist) filing, though the 13G certification disclaims control intent. The stake is just under the 10% threshold, which may avoid certain regulatory triggers.
Price Chart
Executive Summary
RA Capital Management, L.P. and affiliated entities filed a Schedule 13G disclosing a 9.9% passive stake in Corbus Pharmaceuticals Holdings, Inc. as of September 23, 2026. The filing indicates no intent to influence control, consistent with a passive investment by a healthcare-focused fund. This is a new 13G filing for RA Capital on CRBP, adding to prior passive filings by Octagon Capital Advisors and Aberdeen Group.
Key Financial Metrics
Key Facts
- RA Capital Management, L.P. and RA Capital Healthcare Fund, L.P. collectively own 1,914,788 shares of Corbus common stock.
- The stake represents 9.9% of shares outstanding, based on 19,341,293 shares outstanding as of August 4, 2026.
- The filing is a new Schedule 13G (not an amendment), indicating a new 5%+ passive position.
- RA Capital is a healthcare-focused investment firm; the filing certifies the securities were not acquired to change or influence control.
- Prior passive 13G filers on CRBP include Octagon Capital Advisors (amendments in May and February 2026) and Aberdeen Group (January 2026).
Financial Impact
9.9% stake valued at approximately $1.9 million based on share count; no transaction value disclosed.
Risk Factors
- RA Capital could convert to a 13D if it later seeks to influence management or strategy.
- The 9.9% stake creates potential overhang if RA Capital decides to reduce its position.
- CRBP is a clinical-stage biotech with no approved products; pipeline setbacks could impact stock.
Investment Themes
Documents Analyzed
This report is based on 4 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G Filing (Primary) | 0001346824-26-000243 |
| Document: 0001346824-26-000243-index-headers.html | 0001346824-26-000243 |
| Document: 0001346824-26-000243-index.html | 0001346824-26-000243 |
| Document: 0001346824-26-000243.txt | 0001346824-26-000243 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 15, 2026 12d ago | 8-K | $4.33 | awaiting T+60 | — | $4.15 (−4.16%) |
Sep 30, 2026 27d ago | SC 13G | $6.34 | awaiting T+60 | — | $4.15 (−34.54%) |
Sep 22, 2026 5w ago | Institutional Cluster | $7.88 | awaiting T+60 | — | $4.15 (−47.30%) |
Sep 14, 2026 6w ago | 8-K | $8.08 | awaiting T+60 | — | $4.15 (−48.64%) |
Sep 11, 2026 6w ago | Press Release | $8.08 | awaiting T+60 | — | $4.15 (−48.64%) |
Aug 12, 2026 10w ago | Insider Cluster | $10.08 | awaiting T+60 | — | $4.15 (−58.83%) |
Aug 10, 2026 11w ago | Insider Cluster | $9.51 | awaiting T+60 | — | $4.15 (−56.36%) |
May 26, 2026 22w ago | 8-K | $7.91 $9.99 | ▲ +26.30% | ▲ +23.57% | $4.15 (−47.53%) |
May 21, 2026 22w ago | 8-K | $11.51 $10.49 | ▼ −8.86% | ▼ −13.16% | $4.15 (−63.94%) |
May 14, 2026 23w ago | 8-K | $11.98 $9.46 | ▼ −21.04% | ▼ −24.62% | $4.15 (−65.36%) |
US Market Status
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