13D Filings
Zenas BioPharma, Inc.
ZBIO
Amendment
Ownership

4.79%

Total Shares

3,029,921

Issuer CIK

1953926

Event Date

Mar 30, 2026

Accepted

Apr 2, 2026, 05:44 PM

Reporting Persons (3)
NameType% of ClassAggregateSole VotingShared Voting
Leon O. Moulder, Jr.
Individual
4.79%3,029,9211,266,9541,762,967
Tellus BioVentures, LLC
Other
2.77%1,726,03901,726,039
Leon O. Moulder, Jr. Revocable Trust U/A dtd 9/9/2008
Other
0.06%36,928036,928
Disclosure Items (3)

Security Title

Common Stock, $0.0001 par value per share

Issuer Name

Zenas BioPharma, Inc.

Issuer Address

852 Winter Street, Waltham, MA, 02451

Item 3 of the Original Schedule 13D is hereby amended and supplemented by adding the following to the end of Item 3: On February 2, 2026, Mr. Moulder purchased 57,000 shares of Common Stock in multiple open-market transactions at prices per share ranging from $17.69 to $18.14, inclusive. Between March 30, 2026 and March 31, 2026, Tellus purchased 54,000 shares of Common Stock in multiple open-market transactions at prices per share ranging from $18.195 to $19.58, inclusive.

Percentage of Class

See Items 7-11 of the cover pages of this Statement.

Number of Shares

See Items 7-11 of the cover pages of this Statement.

Transactions

Except as reported in this Statement, no Reporting Person has effected any transactions in the Issuer's securities within the past 60 days.

Shareholders

Not applicable.

Date of 5% Ownership

March 31, 2026