This prospectus supplement amends and supplements the original prospectus dated October 21, 2025, primarily updating information related to selling stockholders. The supplement clarifies that selling stockholders may dispose of their shares of the company's common stock (par value $0.0001 per share, listed on Nasdaq Global Select Market under symbol "ZBIO") at various prices (fixed, market, negotiated, etc.) as outlined in the "Plan of Distribution" (page 19 of the prospectus). The supplement is qualified by and should be read in conjunction with the original prospectus, except where it supersedes existing information.
Investment risks are highlighted, and the document disclaims approval or endorsement by the Securities and Exchange Commission or any state securities commission. The date of the supplement is January 28, 2026.
Key updates to the "Selling Stockholders" section:
- Crown/Long Short 41 Segregated Portfolio transferred 8,533 shares to Crown Helix Strategies Ltd. due to an internal reorganization.
- The prospectus table is amended to remove Crown Managed Accounts SPC (acting for the former) and add Crown Helix Strategies Ltd. as a selling stockholder.
- The percentage ownership data is based on 53,679,166 shares outstanding as of October 31, 2025.
- The table includes details on shares offered for sale, prior beneficial ownership, and assumptions (e.g., all registered shares are sold, no additional shares acquired post-supplement date).
Notes:
(1) Selling stockholder information was provided by the stockholders.
(2) "Shares of Common Stock Offered" reflects the total shares available for sale.
(3) Ownership percentages are calculated against the October 31, 2025, share count.
(4) Beneficial ownership prior to the offering includes 8,533 shares held by Crown Managed Accounts SPC and 13,388 shares held by Crown.
The supplement does not affect other selling stockholders listed in the original prospectus.
