TRex Bio 10% owner buys 178,571 shares at $14

Q: How many TRXB shares did Alexandria Venture Investments buy, and at what price?

Alexandria Venture Investments, LLC purchased 178,571 TRex Bio common shares at $14.00 per share on October 13, 2026. No Rule 10b5-1 plan is reported for the purchase.

Q: How many preferred shares converted into TRXB common stock?

On October 13, 2026, 1,033,541 Series A-3 preferred shares and 3,480,387 Series B preferred shares automatically converted into 267,418 and 900,512 common shares, respectively. The conversion occurred upon closing of the initial public offering at a ratio of 3.8649 preferred shares to 1 common share, for no additional consideration.

The conversion ratio was 3.8649 preferred shares for each common share; conversion occurred at the IPO closing for no additional consideration.

Filing Impact

(Very High)

Filing Sentiment

(Positive)How Sentiment works

Sentiment and the balance of points

Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.

How Sentiment works How the balance works

Form Type

Rhea-AI Filing Summary

Alexandria Venture Investments, LLC, a 10% owner of TRex Bio, Inc. (TRXB), purchased 178,571 common shares at $14.00 per share on October 13, 2026; no Rule 10b5-1 plan is reported for the purchase. On the same date, 1,033,541 Series A-3 and 3,480,387 Series B preferred shares automatically converted into 267,418 and 900,512 common shares, respectively, upon closing of the issuer’s initial public offering, for no additional consideration. The corresponding common-stock entry reports acquisition of 1,167,930 shares.

Insights

Analyzing...

Insider Trade Summary

Net Buyer: 178,571 shares

Net Buy 4 txns

Insider Alexandria Venture Investments, LLC

Role 10% Owner

Bought 178,571 shs ($2.50M)

Type	Security	Shares	Price	Value
Conversion	Series A-3 Preferred Stock ^F1	1,033,541	$0.00	$0.00
Conversion	Series B Preferred Stock ^F1	3,480,387	$0.00	$0.00
Conversion	Common Stock ^F1	1,167,930	--	--
Purchase	Common Stock	178,571	$14.00	$2.50M

Holdings After Transaction: Series A-3 Preferred Stock — 0 contracts (Direct); Series B Preferred Stock — 0 contracts (Direct); Common Stock — 1,346,501 shares (Direct)

Footnotes (1)

F1. Each share of preferred stock automatically converted into the Issuer's common stock at a ratio of 3.8649 shares of preferred stock to 1 share of common stock upon closing of the Issuer's initial public offering on October 13, 2026, for no additional consideration. The shares had no expiration date.

Key Figures

Common shares purchased: 178,571 shares Purchase price: $14.00 per share Series A-3 Preferred Stock converted: 1,033,541 shares +5 more

8 metrics

Common shares purchased 178,571 shares October 13, 2026

Purchase price $14.00 per share Common-stock purchase on October 13, 2026

Series A-3 Preferred Stock converted 1,033,541 shares Automatic conversion on October 13, 2026

Common shares from Series A-3 conversion 267,418 shares Upon closing of the initial public offering

Series B Preferred Stock converted 3,480,387 shares Automatic conversion on October 13, 2026

Common shares from Series B conversion 900,512 shares Upon closing of the initial public offering

Conversion ratio 3.8649 preferred shares to 1 common share Automatic conversion for no additional consideration

Common shares acquired in conversion entry 1,167,930 shares Common-stock transaction on October 13, 2026

Key Terms

preferred stock, initial public offering, no additional consideration

3 terms

preferred stock financial

"Each share of preferred stock automatically converted"

Preferred stock is a type of ownership in a company that typically offers investors higher and more consistent dividend payments than common stock. Unlike regular shares, preferred stock usually doesn’t come with voting rights but provides a priority claim on the company’s assets and profits, making it a more stable and predictable investment option. This makes preferred stock attractive to those seeking steady income with lower risk.

initial public offering financial

"upon closing of the Issuer's initial public offering"

An initial public offering (IPO) is when a private company first sells its shares to the public and becomes a stock-listed company. It matters because it allows the company to raise money from a wide range of investors, helping it grow, while giving early shareholders a way to sell some of their ownership.

no additional consideration financial

"for no additional consideration"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many TRXB shares did Alexandria Venture Investments buy, and at what price?

Alexandria Venture Investments, LLC purchased 178,571 TRex Bio common shares at $14.00 per share on October 13, 2026. No Rule 10b5-1 plan is reported for the purchase.

How many preferred shares converted into TRXB common stock?

On October 13, 2026, 1,033,541 Series A-3 preferred shares and 3,480,387 Series B preferred shares automatically converted into 267,418 and 900,512 common shares, respectively. The conversion occurred upon closing of the initial public offering at a ratio of 3.8649 preferred shares to 1 common share, for no additional consideration.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google

Available on EDGAR 10/15/2026 - 04:34 PM EDT Accepted by SEC EDGAR 10/15/2026 - 04:33 PM EDT

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Alexandria Venture Investments, LLC

(Last)

(First)

(Middle)

26 NORTH EUCLID AVENUE

(Street)

PASADENA

CALIFORNIA

91101

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
TRex Bio, Inc. [ TRXB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/13/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	10/13/2026		C		1,167,930	A	⁽¹⁾	1,167,930	D
Common Stock	10/13/2026		P		178,571	A	$14	1,346,501	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Series A-3 Preferred Stock	⁽¹⁾	10/13/2026		C			1,033,541	⁽¹⁾	⁽¹⁾	Common Stock	267,418	$0	0	D
Series B Preferred Stock	⁽¹⁾	10/13/2026		C			3,480,387	⁽¹⁾	⁽¹⁾	Common Stock	900,512	$0	0	D

Explanation of Responses:

1. Each share of preferred stock automatically converted into the Issuer's common stock at a ratio of 3.8649 shares of preferred stock to 1 share of common stock upon closing of the Issuer's initial public offering on October 13, 2026, for no additional consideration. The shares had no expiration date.

Remarks:

	By: /s/ Marc E. Binda, Chief Financial Officer and Treasurer By: ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation, managing member	10/15/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR