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TRXB · Trex Bio, Inc.
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TRXB TRex Bio (TRXB) Insider Trading, Ownership & Congress Trades

CIK 0002139097
Quote by TradingView
Activist 13D
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
0
13F, latest reported quarter
Conversions, 180 days
7
Codes C/M, not in net · $0 priced

What the filings say about TRXB

Insiders, 180 days
+$3.8M net bought
2 buyers
Activist stakes (13D), 180 days
2 filings
Largest: 19.9% of the class

TRex Bio insider trades (Form 4)

Form 4 buys and sells (codes P and S). Grants, option exercises and conversions excluded.

Over the last 180 days, TRex Bio, Inc. insiders bought a net $3.8M of stock across 3 Form 4 purchases and sales, with 2 insiders buying. Source: SEC Form 4 filings, as of 2026-10-28.

Insider
Filed
Shares
Value
Since filing
Alexandria Venture Investments, LLC
BUY
2026-10-15 SECtraded 2026-10-13
178,571
$2.5M
n/a
Context
  • First Form 4 purchase or sale (code P or S) here by this insider on our record.
  • The trade is 13.3% of the 1,346,501 shares held after it.
  • 1 other insider bought within 30 days.
Insider activity: Insider Alexandria Venture Investments, LLC bought about $2.5M of TRXB on Oct 13, 2026, the largest insider purchase at the company on our record; 1 other insider bought within 30 days.
SVLSF VI, LLC
BUY
2026-10-13 SECtraded 2026-10-08
89,783
$1.3M
n/a
Context
  • First Form 4 purchase or sale (code P or S) here by this insider on our record.
  • The trade is 41.8% of the 214,869 shares held after it.
  • 1 other insider bought within 30 days.
Insider activity: Insider SVLSF VI, LLC bought about $1.3M of TRXB on Oct 8, 2026, the largest insider purchase at the company on our record; 1 other insider bought within 30 days.
SVLSF VI, LLC
BUY
2026-10-13 SECtraded 2026-10-08
3,074
$43.0K
n/a
Context
  • First Form 4 purchase or sale (code P or S) here by this insider on our record.
  • The trade is 41.8% of the 7,356 shares held after it.
  • 1 other insider bought within 30 days.
Insider activity: Insider SVLSF VI, LLC bought about $43.0K of TRXB on Oct 8, 2026, the largest insider purchase at the company on our record; 1 other insider bought within 30 days.
3 transactions on record · a thin record, read with care
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
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Seven facts, ranked against the sector · Rank is not a forecast
Insiders
net +$3.8M over 180 days
+$3.8M over 90 days · +$3.8M of it by a 10%+ holder
more than 70% of its sector
Congress
no House purchase disclosed in the last 12 months
Funds
under five funds report holding it
Revenue
no revenue reported in any filing
Margin
no margin: no revenue reported
Buybacks
no share repurchases reported
Short interest
8.2% of the float short (float per yahoo 2026-10-27) · 1.1 days to cover · settled 2026-10-15
The situation: each line is one rule over one dataset
ELI LILLY & Co disclosed a 5%+ stake (19.9%) in the last six months.
What changed in the last 30 days
Oct 16ELI LILLY & Co filed a 13D for 19.9%
Oct 16SV Biotech Crossover Opportunities Fund LP filed a 13D for 7.0%
Oct 16SV BCO I GP LLP filed a 13D for 7.0%
Oct 15Insider Alexandria Venture Investments, LLC bought $2.5M (Oct 13)
Oct 13Insider SVLSF VI, LLC bought $1.3M (Oct 8)

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Who owns TRXB: institutional holders (13F)

13F holdings, latest reported quarter
SEC 13F
No reported 13F holders

No fund above the reporting threshold listed this stock last quarter. That is a fact, not missing data.

Congress trades in TRXB

No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.

Activist and 5% holders (13D/13G)

13D: intends to influence · 13G: passive
ELI LILLY & Co
Activist 13D · 2026-10-16
19.9%
SV Biotech Crossover Opportunities Fund LP
Activist 13D · 2026-10-16
7.0%
SV BCO I GP LLP
Activist 13D · 2026-10-16
7.0%

TRXB planned insider sales (Form 144)

No planned-sale notices
No insider has filed to sell. Watch this after a run-up.
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
An activist crossed the 5% line with declared intent.
The record shows a net $3.8M bought by insiders over 180 days. Each figure is a federal filing, dated the day it went public.
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TRXB Stock Sonar score 1/7 axes

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Insider conviction
88
Inputs
  • Net Form 4 buying (codes P and S), 180d$3.8M · 95 pct, universe of 3,403
  • Insider buyers, 180d2 · 81 pct, universe of 3,445
6 not measured: Profitability, Financial health, Growth, Institutional and government, Risk and compliance, US patents
  • Profitability needs 2 of 4 inputs, 0 present: not filed
  • Financial health needs 1 of 2 inputs, 0 present: not filed
  • Growth needs 1 of 2 inputs, 0 present: no backlog line filed, or no year-earlier backlog; no revenue for this year and the year before
  • Institutional and government needs 1 of 4 inputs, 0 present: fewer than five funds report holding it; no Congress trades in 365 days; no federal contracts in 180 days; no lobbying filings in the last four quarters
  • Risk and compliance needs 1 of 4 inputs, 0 present: needs two 10-Ks with a Risk Factors section (not 20-F filers or stubs); no short interest or no free float on file; revenue under $50M or not filed, so a count cannot be scaled to size
  • US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet

1 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored

TRXB filings, in plain words

Are TRex Bio insiders buying or selling TRXB?

In the 180 days to 2026-10-28, TRex Bio insiders were net buyers, a net $3.8M across purchases and sales reported on Form 4, by 2 buyers.

Read the full summary

In the 180 days to 2026-10-28, TRex Bio insiders were net buyers of TRXB, a net $3.8M across purchases and sales reported on Form 4 by 2 buyers. Most of that figure, $3.8M, came from a holder of 10% or more rather than an officer or director. 2 different insiders reported purchases within the last 90 days, a cluster buy, which is rarer than a single purchase. 2 activist Schedule 13D filings in the last 180 days declared an intent to influence the company, the largest for 19.9% of the class. Each figure is counted from SEC and House filings as of 2026-10-28, dated the day the filing was made public.

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