Alexandria Venture Investments, LLC bought $2.5M (TRXB)

By AlphaYouPublished Oct 15, 2026Form 4

Stocks in this disclosure

Reported activity

Alexandria Venture Investments, LLC

Reporting filer

Alexandria Venture Investments, LLC reported buying 178,571 shares of TRex Bio, Inc. for about $2.5M ($14.00 a share on average). Form 4 filed Oct 15, 2026 lists 4 entries.

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Disclosed: Oct 15, 2026

Reported details

4 entries

All validated entries in this disclosure
Security	Owner	Date	Code	Action	Quantity	Price	Following holdings	Reporting delay	Filed terms and references
Common Stock	Alexandria Venture Investments, LLC	2026-10-13	C	Conversion	1167930	Not stated (see footnotes)	1,167,930	2 days	Filed terms security Title: Common Stock transaction Date: 2026-10-13 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 1167930 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 1167930 direct Or Indirect Ownership: D
Common Stock	Alexandria Venture Investments, LLC	2026-10-13	P	Purchase	178571	14	1,346,501	2 days	Filed terms security Title: Common Stock transaction Date: 2026-10-13 transaction Form Type: 4 transaction Code: P equity Swap Involved: 0 transaction Shares: 178571 transaction Price Per Share: 14 transaction Acquired Disposed Code: A shares Owned Following Transaction: 1346501 direct Or Indirect Ownership: D
Series A-3 Preferred Stock (derivative)	Alexandria Venture Investments, LLC	2026-10-13	C	Conversion	1033541	0	0	2 days	Filed terms security Title: Series A-3 Preferred Stock id: F1 transaction Date: 2026-10-13 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 1033541 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F1 id: F1 underlying Security Title: Common Stock underlying Security Shares: 267418 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D
Series B Preferred Stock (derivative)	Alexandria Venture Investments, LLC	2026-10-13	C	Conversion	3480387	0	0	2 days	Filed terms security Title: Series B Preferred Stock id: F1 transaction Date: 2026-10-13 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 3480387 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F1 id: F1 underlying Security Title: Common Stock underlying Security Shares: 900512 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D

Common Stock

Owner: Alexandria Venture Investments, LLC
Date: 2026-10-13
Code: C
Action: Conversion
Quantity: 1167930
Price: Not stated (see footnotes)
Following holdings: 1,167,930
Reporting delay: 2 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-13
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 1167930
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1167930
direct Or Indirect Ownership: D

Common Stock

Owner: Alexandria Venture Investments, LLC
Date: 2026-10-13
Code: P
Action: Purchase
Quantity: 178571
Price: 14
Following holdings: 1,346,501
Reporting delay: 2 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-13
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Shares: 178571
transaction Price Per Share: 14
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1346501
direct Or Indirect Ownership: D

Series A-3 Preferred Stock (derivative)

Owner: Alexandria Venture Investments, LLC
Date: 2026-10-13
Code: C
Action: Conversion
Quantity: 1033541
Price: 0
Following holdings: 0
Reporting delay: 2 days
Filed terms and references: Filed terms
security Title: Series A-3 Preferred Stock
id: F1
transaction Date: 2026-10-13
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 1033541
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 267418
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D

Series B Preferred Stock (derivative)

Owner: Alexandria Venture Investments, LLC
Date: 2026-10-13
Code: C
Action: Conversion
Quantity: 3480387
Price: 0
Following holdings: 0
Reporting delay: 2 days
Filed terms and references: Filed terms
security Title: Series B Preferred Stock
id: F1
transaction Date: 2026-10-13
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 3480387
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 900512
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D

Purchases, sales, grants and option exercises are different transactions. The reported code identifies the action; it does not establish a motive.

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.
Alexandria Venture Investments, LLC: 10% owner.
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.

Original sources

SEC ownership filing

Prepared automatically from public filing data. Report a correction.

Security

Owner

Date

Code

Action

Quantity

Price

Following holdings

Reporting delay

Filed terms and references

Common Stock

Alexandria Venture Investments, LLC

2026-10-13

Conversion

1167930

Not stated (see footnotes)

1,167,930

2 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-13
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 1167930
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1167930
direct Or Indirect Ownership: D

Common Stock

Alexandria Venture Investments, LLC

2026-10-13

Purchase

178571

1,346,501

2 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-13
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Shares: 178571
transaction Price Per Share: 14
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1346501
direct Or Indirect Ownership: D

Series A-3 Preferred Stock (derivative)

Alexandria Venture Investments, LLC

2026-10-13

Conversion

1033541

2 days

Filed terms

security Title: Series A-3 Preferred Stock
id: F1
transaction Date: 2026-10-13
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 1033541
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 267418
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D

Series B Preferred Stock (derivative)

Alexandria Venture Investments, LLC

2026-10-13

Conversion

3480387

2 days

Filed terms

security Title: Series B Preferred Stock
id: F1
transaction Date: 2026-10-13
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 3480387
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 900512
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.

Alexandria Venture Investments, LLC: 10% owner.

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.