TRex Bio, Inc. (TRXB) insider trading
TRex Bio, Inc. insiders have made 2 open-market purchases worth $3.8M since Oct 13, 2026, by 2 different insiders. The latest: Alexandria Venture Investments, LLC (10% owner) bought $2.5M, filed Oct 15, 2026, scored 35 out of 100. 1 buy in the last year came within ten days of another insider's: a cluster, one of the stronger patterns in the research.
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Insider purchases
| Filed | Insider | Stake | Score | Bought | 1 week | 1 month |
|---|---|---|---|---|---|---|
| Oct 15 Form 4 (opens sec.gov) |
Alexandria Venture Investments, LLC10% owner10% owner · 2 insiders buying | +15% stake | 35 | $2.5M 178,571 at $14.00 |
−1.4% | waiting |
| Oct 13 Form 4 (opens sec.gov) |
SVLSF VI, LLC10% owner · 2 insiders buying10% owner · 2 insiders buying | +72% stake | 44 | $1.3M 92,857 at $14.00 |
+12.9% | waiting |
Track record (hypothetical): a week after the filing, these buys averaged +5.7% (50% up, 2 measured).
Investors with more than 5% of TRXB (13D and 13G)
| Filed | Investor | Kind | Stake |
|---|---|---|---|
| Oct 16 13G | PFIZER INC. (13-5315170) | Passive | 7.2% |
| Oct 16 13D | ELI LILLY & Co | Activist | 19.9% |
| Oct 16 13D | SV Biotech Crossover Opportunities Fund LP | Activist | 7% |
| Oct 15 13G | Johnson & Johnson Innovation - JJDC, Inc. | Passive | 5.3% |
A 13D is filed by an investor who may push for change; a 13G by a passive one.
Insiders who bought TRXB
- Alexandria Venture Investments, LLC 10% owner
- SVLSF VI, LLC 10% owner
Questions
Are insiders buying TRXB stock?
Yes. In the last 90 days, 2 open-market purchases were filed, worth $3.8M.
Who bought TRXB stock most recently?
Alexandria Venture Investments, LLC, 10% owner, bought 178,571 shares for $2.5M (Form 4 (opens sec.gov), filed Oct 15, 2026).
How does InsiderBeacon score an insider buy?
Out of 100, from who bought, how much their stake grew, the size of the trade, whether other insiders bought within ten days, where the price sat in its 52-week range, and whether it was a first or a routine buy. The score is fixed when the filing arrives. The formula and the research behind it.
Insiders are also buying, same industry
Data as of Oct 15, 2026, from SEC EDGAR Form 4 filings: open-market purchases (code P) of $25,000 or more, and open-market sales. Every row links to its filing. Scores summarise what a filing says (how the score works); outcomes are hypothetical, from the first close after the filing, and past results don't predict future ones. Disclaimer