COMPANY RESEARCH
TRex Bio, Inc.
TRXB · United States · Healthcare
INSIDER SIGNAL
Insider activity score：68.6 / 100
2 insiders · 2 purchase events · $3.80m net purchases
US #177 · United States #177
WHY THIS SIGNAL?
Score anatomy
Each bar shows the contribution to the current score; the weights and formula stay unchanged.
Cluster+14.0 / 35
How many distinct insiders bought in the cluster
Purchase size+21.4 / 25
Purchase value relative to company size and liquidity
Role+6.0 / 20
The seniority and relevance of participating insiders
Recency+9.2 / 10
How recently the purchases occurred
Conviction+10.0 / 10
How clearly buying stands out from other activity
What is holding the score back?
- ⚠ Buyer breadth is moderate · fewer than 4 distinct filers
- ⚠ Insider role contributes less on the current role scale
- ✓ Recent activity · latest purchase 2026-10-13
The role contribution follows the US model's seniority ladder.
Buying concentration
66%
Largest buyer：Alexandria Venture Investments, LLC · 2.50m USD
Gross qualified purchase transaction-line value：3.80m USD
The headline $ total is net buying for the screen; this module uses gross qualified purchase transaction-line values in the filing currency, so the amounts can differ. The current 15-day buyer-breadth input counts distinct buyers; value concentration is disclosed separately here.
This is a ranking under the current US screening rules—not a probability of gain, return forecast, or buy recommendation.
Key purchase quotes (filing currency)
| Filer | Price per unit | Trade date |
|---|---|---|
| Alexandria Venture Investments, LLC | 14 USD | Oct 13, 2026 |
| SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | 14 USD | Oct 8, 2026 |
Model details
Cluster breakdown (does not change the score)
- 15-day buyer breadth (count)
- 2 distinct reported filers
- Peak time window
- 2026-10-08 to 2026-10-13
- Current breadth input
- 0.400 (capped at 4+ buyers)
- Buyer independence
- Not yet measured; related-party fields are not cross-market comparable
What the filings show
- 🟢 Recent eligible purchase
Alexandria Venture Investments, LLC · 2.50m USD · Price 14 USD · Oct 13, 2026 - 🟢 Eligible purchase
SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC · 1.30m USD · Price 14 USD · Oct 8, 2026 - 🔴 7 other transaction line(s) are not counted as discretionary-buying evidence; 5 have zero price
Insider vs stock price
2 purchase day(s), 3 purchase line(s) in the 180-day window.
Daily close (USD)Day with an insider purchase
Markers sit on the closing price of the transaction day. They show when insiders traded, not the price they paid or received. "Since" compares that day's close with the last close shown; it is what happened at this company, not a forecast.
If you had followed the purchase
Each row starts on the first close on or after the day a purchase was made public, the earliest a reader could have acted, and ends on the last close shown above.
| Made public | Insiders | In this stock, now | In the median peer stock, now | Difference |
|---|---|---|---|---|
| 2026-10-13 | 1 | 1,030 +3.0% | 991 −0.9% | +39 +3.9 pts |
| 2026-10-15 | 1 | 989 −1.1% | 995 −0.5% | −6 −0.6 pts |
1 of 2 disclosure day(s) ended ahead of the median peer stock.
Close to close, before costs, taxes, dividends and currency moves. The peer is the median of the other stocks on the same exchange for which this site holds prices (111 here), not an index. This is what happened, not a forecast: across all purchases on this site the typical gap is close to zero.
Insider timeline
2 insiders bought within 6 days, 8 Oct to 13 Oct: 2 Associated person. That week 73 companies across United States disclosed insider purchases, an ordinary week (24 of the last 26).
Tap an item for what it means.
●A purchase: the bigger the dot, the more was bought
Each dot is one insider's purchases on one day. The dot's area follows the amount: the largest purchase here gets the largest dot. Hold the pointer over a dot to see the date and the amount.
▮Purple band: several insiders bought within 15 days
The band marks the stretch with the most different buyers: at most 15 days long and at least two people. Here it is 8 Oct – 13 Oct, with 2 insiders. Only the strongest stretch is marked. Several people deciding the same thing is harder to explain by one person's private reasons, but insiders often buy together just after a closed period ends, so compare it with the grey weekly bars.
▂Grey bars: companies across United States disclosing purchases each week
A taller bar is a week in which more companies disclosed insider purchases. The purple bar is the week of the band above: 73 companies, number 24 of the last 26 weeks. If that week was a peak anyway, buying together is less special than it looks.
This company: insiders buying per month, last 12 months
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
2Oct
Darker bars are inside the 180-day window above.
Who traded
| Insider | Role | Purchases | Sales | Bought | First purchase | Share price since |
|---|---|---|---|---|---|---|
| SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | Associated person | 1 | — | 1.3M USD | 2026-10-08 | — |
| Alexandria Venture Investments, LLC | Associated person | 1 | — | 2.5M USD | 2026-10-13 | — |
Why this score? · Model details
Priority = 100 × Σ(fixed weight × 0–1 rule-based input)
| Factor | Weight | This company input | Point contribution |
|---|---|---|---|
| 15-day buyer breadth (count) | 35% | 0.400 | 14.0 |
| Qualified-buy size | 25% | 0.854 | 21.4 |
| Role informativeness (inverted) | 20% | 0.700 | 14.0 |
| Recency | 10% | 0.920 | 9.2 |
| Buy/sell conviction | 10% | 1.000 | 10.0 |
This is a heuristic ordering under the current rules, not a calibrated return forecast. It explains why candidates rank differently; the public-filing evidence and data limits are shown below.
BULL VS BEAR
Two readings of this buying
The same filings, read two ways. Each line is a fact stored for this company with the number behind it, and appears only when that number crosses a fixed threshold. Neither side is a forecast and no winner is declared.
Where the evidence comes from
Independent evidence does not object: the purchases themselves carry bull lines (more buyers than usual here, large purchases, bought in the last two weeks); short sellers were checked and none crosses a bear threshold. No data is held for: share price and trading, company results, company actions.
- The insider purchases themselvesBullmore buyers than usual here, large purchases, bought in the last two weeks4 checked, under the threshold · 3 missing
- Share price and tradingno data held
- Short sellers1 checked, under the threshold
- Company results2 missing
- Company actionsno data held
Bull case · the buying is informative
- No insider bought in the 180 days before this window; 2 have bought in it. The buying is new for this company, not a habit.
- Insiders committed a net $3.8M of their own money in 180 days.
- The latest purchase is 5 days old (2026-10-13). The buying is current, not left over from an earlier quarter.
Bear case · discount it
Nothing held here argues against the buying. That is not the same as nothing existing: see the missing evidence below.
Evidence still missing
- No buyer here has 5 or more completed earlier purchases on record, so there is no track record to weigh.
- The company's market value is not captured, so the purchases cannot be stated as a share of the business or of its trading volume.
- No earnings, margin or cash-flow figures are captured for this company. The latest annual and interim reports are where to check whether the business is improving or deteriorating.
- The 10b5-1 box of these Form 4 filings has not been read, so whether the purchases followed a pre-arranged plan is not known.
- Form 4 states the shares held after each trade. This site reads that from the SEC's quarterly data, which is published after a quarter ends, so it does not have it yet for these filings. Whether a purchase added 1% to a personal stake or doubled it is in the filing, not on this page.
Checked and under the threshold: 5, 2 close to it
- BullAt most 2 insiders bought within any 15 days. Counted for the bull side from 3. close to the threshold
- BearThe largest buyer accounts for 66% of the value bought. Counted for the bear side from 80%. close to the threshold
- BearNo insider sale is recorded in the same 180 days.
- BearOver the last 5 trading days to 2026-10-16, 52% of this stock's off-exchange volume was sold short. The market's median is 50%. This is trading volume, not a position: a market maker who sells short and covers the same day is counted, so about half of all volume is short on an ordinary day. It is shown for comparison and counts for neither side.
- BearNo insider filing in the last 180 days opened a hedge on this stock.
Both columns arrange stored facts only. They do not change the insider score or the ranking and are not investment advice.
Signal history
68.6 / 100
Latest recorded score
↓ -0.3 ptssince the first recorded snapshot on 2026-10-16; 2 calendar days observed
- Recorded snapshots
- 2
- First snapshot
- 2026-10-16
There is not yet a 30-calendar-day comparison; earlier scores are not reconstructed. These are raw signal scores saved when each full scoring run completed. They describe changes in research ranking, not price performance or returns.
Why did it change?
Less than 30 days of comparable history is available, so factor movement is not yet decomposed.
Signal score history
Fixed 0–100 scale; dates are spaced by calendar time.
Recent recorded points
- 68.9
- 68.6
View all recorded scores
| Snapshot date | Signal score |
|---|---|
| 2026-10-16 | 68.9 |
| 2026-10-18 | 68.6 |
Sector context
- Buying breadth
- 4.1% (42 / 1,029 issuers)
- Sector rank
- #8 / 13
This is sector-level research context. It does not affect the Insider Signal or ranking.
Insider profile outcomes
Historical performance following insider filings. The company role is translated below each name while preserving the original title.
- Excess return = stock return − S&P 500 ETF (SPY adjusted close) return over the same period.
- Hit rate = completed events with positive excess return ÷ total completed events.
- Price coverage = valid point-in-time prices ÷ events mature enough for that period.
- Returns start on the first shared trading session on or after publication.
- Small-sample rule: n<5 is shown for transparency and is not scored.
Events are disclosure-level observations; related disclosures published on the same date may share a return path and may not be statistically independent. This research enrichment does not affect the insider score or ranking.
Signal outcomes
Calculated from immutable US ranking snapshots; excess return is stock return minus SPY return. Newly saved snapshots remain pending until each forward horizon matures. This never affects the US score.
| Horizon | Status | Result |
|---|---|---|
| 5D | Awaiting maturity | — |
| 20D | Awaiting maturity | — |
| 60D | Awaiting maturity | — |
| 120D | Awaiting maturity | — |
Market context
PRICE PERFORMANCE
VOLATILITY & LIQUIDITY
- Volatility
- —
- Beta
- —
- Avg daily volume
- —
VALUATION
- Market cap
- —
- P/E
- —
FUNDAMENTALS
- Profit margin
- —
- ROE
- —
- Industry
- —
Prices to 16 Oct 2026: OpenBB/yfinance. It does not affect the insider score or rank.
Insiders' buying price vs the latest close
Insiders paid 14.00 USD a share on average (1 purchase line, 1 buyer, 2026-10-13 – 2026-10-13). The close on 2026-10-16 was 0.1% above that price.
Prices paid are weighted by shares and taken from the filings; dividends are not counted. Not scored. 2 more purchase lines could not be compared with the share price and are left out.
Buying size vs market trading
Complete price and volume history is not yet available.
Market-data coverage: 0 verified sessions · Latest session: — · Ratio status: Unavailable
Traded value is estimated as close × shares traded, in major currency units. Includes disclosed qualifying purchases; disclosures may lag. Contractual or planned acquisitions are not necessarily discretionary. Ratios describe relative trading size, not market participation or score contributions.
Regulatory filings
- Insider filing announcement · published 2026-10-15 · trade date 2026-10-13
- Insider filing announcement · published 2026-10-13 · trade date 2026-10-13
- Insider filing announcement · published 2026-10-13 · trade date 2026-10-13
Results and insider purchases
No results announcement (8-K Item 2.02) from this company was found in its SEC filings.
Ownership and trading-plan context
| Direct / indirect ownership | Direct, Indirect |
|---|---|
| 10b5-1 filing evidence | Not declared in filing field |
| Evidence retrieved | 2026-10-16T22:30:00+00:00 |
These are accession-level filing fields. Unavailable means the evidence was not fetched or parsed; it is never inferred as “No” and does not adjust the US score.
Filing evidence
These are underlying national-feed records from the 365-day window ending on the saved ranking snapshot. The score uses only the latest 180 days; older qualifying equity purchases remain visible for audit but do not enter the current score. The original filer, role, transaction classification, instrument, price, volume, value and source fields are retained. The first three rows are shown; remaining records can be unfolded for audit. Other transaction types are retained but excluded from the score.
Excluded transactions & classification
2 qualifying purchase disclosure(s) · 3 transaction line(s)
Oct 8, 2026Open market purchase
SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC · TenPercentOwner
Common Stock · 89783 shares × 14.0 USD · 1256962.0 USD
Open filingOct 8, 2026Open market purchase
SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC · TenPercentOwner
Common Stock · 3074 shares × 14.0 USD · 43036.0 USD
Open filingOct 13, 2026Open market purchase
Alexandria Venture Investments, LLC · TenPercentOwner
Common Stock · 178571 shares × 14.0 USD · 2499994.0 USD
Open filingShowing 3 of 3 matching raw-feed row(s) from the current 365-day research window. Prices and reported values remain in the filing currency and its major unit (for example, UK pence are parsed as GBP). The screen-level $ aggregate is separately FX-normalised for research ranking, not a trade-date conversion.
Other disclosed transactions · excluded from score
View 7 other transaction(s)
Oct 13, 2026Conversion of derivative security
MARCUS JOEL S · Director
Common Stock · 41871 shares × — · 0.0 USD
Open filingOct 13, 2026Conversion of derivative security
SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC · TenPercentOwner
Common Stock · 1574074 shares × 0.0 USD · 0.0 USD
Open filingOct 13, 2026Conversion of derivative security
SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC · TenPercentOwner
Common Stock · 475411 shares × 0.0 USD · 0.0 USD
Open filingUnfold all 4 remaining filing row(s)
| Transaction date | Published | Filer | Role | Transaction | Instrument | Price (local currency) | Quote currency | Volume | Reported value (local currency) | Source |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026-10-13 | 2026-10-13 | SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | TenPercentOwner | Conversion of derivative security | Common Stock | 0.0 USD | USD | 53892 | 0.0 USD | Open filing |
| 2026-10-13 | 2026-10-13 | SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | TenPercentOwner | Conversion of derivative security | Common Stock | 0.0 USD | USD | 16277 | 0.0 USD | Open filing |
| 2026-10-13 | 2026-10-13 | SV Life Sciences Fund VI (GP), L.P.; SV Life Sciences Fund VI, L.P.; SVLSF VI, LLC | TenPercentOwner | Conversion of derivative security | Common Stock | 0.0 USD | USD | 669939 | 0.0 USD | Open filing |
| 2026-10-13 | 2026-10-15 | Alexandria Venture Investments, LLC | TenPercentOwner | Conversion of derivative security | Common Stock | — | USD | 1167930 | 0.0 USD | Open filing |
Showing 7 of 7 matching raw-feed row(s) from the current 365-day research window. Prices and reported values remain in the filing currency and its major unit (for example, UK pence are parsed as GBP). The screen-level $ aggregate is separately FX-normalised for research ranking, not a trade-date conversion.
Snapshot & identity
- Snapshot date
- 2026-10-18
- Ticker
- TRXB
- ISIN
- —
- Sector
- Healthcare
- Industry
- —
Company logos by Parqet
How to read Form 4 transaction codes
| Code | Interpretation | Screen treatment |
|---|---|---|
| P | Open-market / private purchase | Buy evidence when the security is qualifying equity |
| S | Sale | Sell evidence when the security is qualifying equity |
| A | Grant / award | Context only |
| F | Tax-related withholding | Context only |
| M | Option exercise | Context only |
| G | Gift | Context only |
| J / L | Other / non-directional | Context only |
P/S rows for options, warrants, compensation units and debt remain visible for audit but are excluded from equity scores and quotes.