ERWIN MARION JOHNSTON JR.

PrivateCIK: 2152052
Location

SOUTH SAN FRANCISCO, CA

InsiderERWIN MARION JOHNSTON JR.CIK 2152052
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IssuerTREX BIO, INC.CIK 2139097
DirectorOfficer· Chief Executive Officer
Since Oct 2026
0.00
Baseline shares
0.00
Direct ownership
0 positions
1.14M
Derivative underlying
4 instruments
0
Security positions
All direct
Non-Derivative Holdings0
No non-derivative holdings reported
Derivative Holdings4

Stock Option (Right to Buy)

Direct
Underlying security
Common Stock

Underlying shares

459.61K

Shares owned

N/A

Exercise price

1.24

Expiration

—

Exercise window

—

Stock Option (Right to Buy)

Direct
Underlying security
Common Stock

Underlying shares

299.49K

Shares owned

N/A

Exercise price

1.09

Expiration

—

Exercise window

—

Stock Option (Right to Buy)

Direct
Underlying security
Common Stock

Underlying shares

126.68K

Shares owned

N/A

Exercise price

1.09

Expiration

—

Exercise window

—

Stock Option (Right to Buy)

Direct
Underlying security
Common Stock

Underlying shares

257.27K

Shares owned

N/A

Exercise price

1.28

Expiration

—

Exercise window

—

Total

Underlying

1.14M

Owned

0.00

ERWIN MARION JOHNSTON JR. — Initial Ownership Disclosure (Form 3) Filed Oct 9, 2026 | Finecho