Fairmount Funds Management LLC - Oct 7, 2025 Form 4 Insider Report for Zenas BioPharma, Inc. (ZBIO)

Role
Director
Signature
/s/ Tomas Kiselak, Managing Member of Fairmount Funds Management LLC
Stock symbol
ZBIO
Transactions as of
Oct 7, 2025
Transactions value $
$6,008,161
Form type
4
Date filed
10/9/2025, 04:15 PM
Previous filing
Oct 8, 2025
SEC
View on sec.gov

Reporting Owners (4)

Name Relationship Address Signature Signature date CIK
Fairmount Funds Management LLC Director 200 BARR HARBOR DRIVE, SUITE 400, WEST CONSHOHOCKEN /s/ Tomas Kiselak, Managing Member of Fairmount Funds Management LLC 2025-10-09 0001802528
Fairmount Healthcare Fund II L.P. Director 200 BARR HARBOR DRIVE, SUITE 400, WEST CONSHOHOCKEN /s/ Tomas Kiselak, Managing Member of Fairmount Healthcare Fund II, L.P. 2025-10-09 0001769651
Kiselak Tomas Director 200 BARR HARBOR DRIVE, SUITE 400, WEST CONSHOHOCKEN /s/ Tomas Kiselak 2025-10-09 0001830177
Harwin Peter Evan Director 200 BARR HARBOR DRIVE, SUITE 400, WEST CONSHOHOCKEN /s/ Peter Harwin 2025-10-09 0001663607

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ZBIO Common Stock Purchase $6.01M +316K +16.71% $19.00 2.21M Oct 7, 2025 By Fairmount Healthcare Fund II L.P. F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Fairmount Funds Management LLC ("Fairmount") is the investment manager for Fairmount Healthcare Fund II L.P. The managers of Fairmount are Peter Harwin and Tomas Kiselak. Fairmount, Mr. Harwin, and Mr. Kiselak disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.

Remarks:

Fairmount may be deemed a director by deputization of Issuer by virtue of the fact that Tomas Kiselak serves on the board of directors of the Issuer and is also a Managing Member of Fairmount.