← United States · Coverage record
US · SEC FORM 4
TRex Bio, Inc.
TRXB · — · CIK 0002139097 · Healthcare · Biotechnology
INSIDER SIGNAL
2 buyers · 3 purchase transaction lines · $3.8M gross purchase
WHY THIS SIGNAL?
Score anatomy
Each bar shows the contribution to the current score; the weights and formula stay unchanged.
What is holding the score back?
- ⚠ Cluster breadth is moderate · 2 insider(s), not 4+
- ⚠ Role scores low · most senior buyer: TenPercentOwner (CEO, chair and 10% owners score lowest)
- ✓ Recent activity · latest purchase 2026-10-13
Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.
US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.
Insider activity timeline
Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.
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Purchase breadth & concentration
Roles in the peak window: TenPercentOwner. Concentration uses priced qualifying P lines only and does not change the saved score.
SIGNAL HISTORY
Latest recorded score
- 68.9
- 68.6
Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.
Recent Form 4 activity
P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.
Market context
Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.
Price performance
- 1M
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- 3M
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- 6M
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- 12M
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Volatility & liquidity
- Volatility
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- Beta
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- Avg daily value
- —
Valuation
- Market cap
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- P/E
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Fundamentals
- Profit margin
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- ROE
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- Industry
- Biotechnology
Market data
Price data up to: 2026-10-16 · Price source: OpenBB/yfinance · Status: PASS
Short interest
The FINRA report lists no short interest for this ticker.
FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.
Historical equity purchases
Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.
| Transaction date | Reporting owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2026-10-13 | Alexandria Venture Investments, LLC | Purchase (P) | Common Stock | 178,571 | USD 14.00 | USD 2,499,994 | SEC filing ↗ |
| 2026-10-08 | SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | Purchase (P) | Common Stock | 92,857 | USD 14.00 | USD 1,299,998 | SEC filing ↗ |
Form 4 evidence
10 transaction lines in the latest 365-day window; 10 in local history.
| Date | Owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2026-10-13 | Alexandria Venture Investments, LLC | Purchase (P) | Common Stock | 178,571 | USD 14.00 | USD 2,499,994 | SEC filing ↗ |
| 2026-10-13 | Alexandria Venture Investments, LLC | C (C) | Common Stock | 1,167,930 | USD — | USD — | SEC filing ↗ |
| 2026-10-13 | SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | C (C) | Common Stock | 2,789,593 | USD 0.00 | USD 0 | SEC filing ↗ |
Show recent Form 4 evidence (5 grouped rows)
| Date | Owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2026-10-13 | Alexandria Venture Investments, LLC | Purchase (P) | Common Stock | 178,571 | USD 14.00 | USD 2,499,994 | SEC filing ↗ |
| 2026-10-13 | Alexandria Venture Investments, LLC | C (C) | Common Stock | 1,167,930 | USD — | USD — | SEC filing ↗ |
| 2026-10-13 | SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | C (C) | Common Stock | 2,789,593 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-10-13 | MARCUS JOEL S | C (C) | Common Stock | 41,871 | USD — | USD — | SEC filing ↗ |
| 2026-10-08 | SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | Purchase (P) | Common Stock | 92,857 | USD 14.00 | USD 1,299,998 | SEC filing ↗ |
Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.
Snapshot & identity
| Snapshot date | 2026-10-18 |
|---|---|
| Ranking version | US-v1.2 |
| Data quality | PASS ELIGIBLE · — |
| Ticker | TRXB |
| CIK | 0002139097 |
| Sector | Healthcare |
| Industry | Biotechnology Yahoo Finance |
| SEC SIC | 2836 Biological Products, (No Diagnostic Substances) |
| Exchange | — |
Data coverage
| Local Form 4 history | 10 transaction lines from 2026-10-08 to 2026-10-13 3 P purchase lines · 0 S sale lines · 7 other lines |
|---|---|
| SEC company submissions | Open SEC filings ↗ |
Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.