Patrick G. Enright - Oct 9, 2025 Form 4 Insider Report for Zenas BioPharma, Inc. (ZBIO)

Role
Director
Signature
By: /s/ Cristiana Oliveira, attorney-in-fact for Patrick G. Enright
Stock symbol
ZBIO
Transactions as of
Oct 9, 2025
Transactions value $
$2,250,027
Form type
4
Date filed
10/14/2025, 08:59 AM
Previous filing
Aug 11, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
ENRIGHT PATRICK G Director C/O ZENAS BIOPHARMA, INC., 1000 WINTER STREET, SUITE 1200, WALTHAM By: /s/ Cristiana Oliveira, attorney-in-fact for Patrick G. Enright 2025-10-14 0001253886

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ZBIO Common Stock Purchase $2M +105K +6.09% $19.00 1.83M Oct 9, 2025 See Footnote F1, F2
transaction ZBIO Common Stock Purchase $250K +12K $20.85 12K Oct 9, 2025 Direct F1
holding ZBIO Common Stock 775K Oct 9, 2025 See Footnote F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 On October 7, 2025, the Issuer entered into a Securities Purchase Agreement with certain investors, including the Reporting Person and Longitude Venture Partners IV, L.P. ("LVPIV") pursuant to which the Reporting Person purchased 11,990 shares of common stock at a price per share of $20.85 and LVPIV purchased 105,265 shares of common stock as a price per share of $19.00 (the "Offering"). The Offering closed on October 9, 2025.
F2 Shares held by LVPIV. Longitude Capital Partners IV, LLC ("LCPIV") is the general partner of LVPIV and may be deemed to have voting, investment and dispositive power with respect to these securities. Juliet Tammenoms Bakker and the Reporting Person, a member of the board of directors of the Issuer, are the managing members of LCPIV and may each be deemed to share voting, investment and dispositive power with respect to these securities. Each of LCPIV, Ms. Bakker and the Reporting Person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interests therein.
F3 Shares held by Longitude Prime Fund, L.P. ("LPF"). Longitude Prime Partners, LLC ("LPP") is the general partner of LPF and may be deemed to have voting, investment and dispositive power with respect to the securities held by LPF. Juliet Tammenoms Bakker and the Reporting Person, a member of the board of directors of the Issuer, are the managing members of LPP and may each be deemed to share voting, investment and dispositive power with respect to these securities. Each of LPP, Ms. Bakker and the Reporting Person disclaims beneficial ownership of such securities except to the extent of their respective pecuniary interests therein.