This is a standard Form 3 filing for a new insider. No immediate trading signal. Monitor for future Form 4 filings to track any open-market purchases or sales by Marcus.
Price Chart
Executive Summary
Joel S. Marcus filed a Form 3 initial statement of beneficial ownership with TRex Bio, Inc., reporting 161,828 shares of common stock and an undisclosed amount of Series B Convertible Preferred Stock. This is a routine Section 16 filing for a new insider, indicating Marcus has become an officer or director of the company.
Key Facts
- Joel S. Marcus filed a Form 3 initial statement of beneficial ownership with TRex Bio, Inc. (TRXB) on October 8, 2026.
- Marcus reported beneficial ownership of 161,828 shares of Common Stock.
- Marcus also reported ownership of Series B Convertible Preferred Stock, convertible into Common Stock on a 3.8649-for-1 basis, with automatic conversion prior to the IPO closing.
- The filing includes a Power of Attorney authorizing Johnston Erwin, Brandon Hants, and Laura Berner to execute Section 16 filings on Marcus's behalf.
Financial Impact
No financial impact; routine insider ownership disclosure.
Risk Factors
- None directly from this filing; insider ownership changes may signal future trading activity.
Documents Analyzed
This report is based on 4 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 3 Filing (Primary) | 0001193125-26-418270 |
| Document: 0001193125-26-418270-index-headers.html | 0001193125-26-418270 |
| Document: 0001193125-26-418270-index.html | 0001193125-26-418270 |
| Document: 0001193125-26-418270.txt | 0001193125-26-418270 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 16, 2026 10d ago | SC 13G | $14.80 $14.44 | ▼ −2.43% | ▼ −2.77% | $13.87 (−6.28%) |
Oct 16, 2026 10d ago | SC 13D | $14.80 $14.44 | ▼ −2.43% | ▼ −2.77% | $13.87 (−6.28%) |
Oct 16, 2026 10d ago | SC 13D | $14.01 $14.80 | ▲ +5.64% | ▲ +5.22% | $13.87 (−1.00%) |
Oct 15, 2026 11d ago | Insider Cluster | $14.01 $14.80 | ▲ +5.64% | ▲ +5.22% | $13.87 (−1.00%) |
Oct 15, 2026 11d ago | SC 13G | $14.16 $14.01 | ▼ −1.06% | ▲ +0.05% | $13.87 (−2.05%) |
Oct 13, 2026 13d ago | Press Release | $13.50 $14.16 | ▲ +4.89% | ▲ +4.60% | $13.87 (+2.74%) |
Oct 9, 2026 17d ago | 424B4 | $14.03 $13.60 | ▼ −3.06% | ▼ −3.05% | $13.87 (−1.14%) |
Oct 9, 2026 18d ago | EFFECT | $14.00 $14.03 | ▲ +0.21% | ▲ +0.27% | $13.87 (−0.93%) |
Oct 8, 2026 18d ago | 3 | $14.00 $14.03 | ▲ +0.21% | ▲ +0.27% | $13.87 (−0.93%) |
Oct 8, 2026 18d ago | 3 | $14.00 $14.03 | ▲ +0.21% | ▲ +0.27% | $13.87 (−0.93%) |
US Market Status
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