Zenas BioPharma, Inc.

Symbol
ZBIO on Nasdaq
Industry
Pharmaceutical Preparations (Office Of Life Sciences)
Business address
852 Winter Street, Suite 250, Waltham, MA, 02451
State of incorporation
DE
Fiscal year end
December 31
Former names
Zenas BioPharma (Cayman) Ltd (to 11/15/2022)
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Zenas BioPharma, Inc. has filed 131 SEC EDGAR filings since 11/15/2022

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
SCHEDULE 13G/A Open Document Open Filing Nov 14, 2025 005-94625
10-Q Open Document | Data Open Filing 10-Q Nov 12, 2025 Sep 30, 2025 001-42270
8-K Open Document | Data Open Filing FORM 8-K Nov 12, 2025 Nov 12, 2025 001-42270
8-K Open Document | Data Open Filing FORM 8-K Oct 27, 2025 Oct 27, 2025 001-42270
S-3ASR Open Document | Data Open Filing S-3ASR Oct 21, 2025 333-290999
3 Open Document Open Filing Oct 15, 2025 Oct 7, 2025
SCHEDULE 13G Open Document Open Filing Oct 15, 2025 005-94625
SCHEDULE 13D/A Open Document Open Filing Oct 14, 2025 005-94625
SCHEDULE 13D/A Open Document Open Filing Oct 14, 2025 005-94625
4 Open Document Open Filing 4 Oct 14, 2025 Oct 9, 2025
4 Open Document Open Filing 4 Oct 14, 2025 Oct 9, 2025
SCHEDULE 13D/A Open Document Open Filing Oct 14, 2025 005-94625
4 Open Document Open Filing 4 Oct 14, 2025 Oct 9, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Oct 9, 2025 Oct 7, 2025
SCHEDULE 13D/A Open Document Open Filing Oct 9, 2025 005-94625
4 Open Document Open Filing OWNERSHIP DOCUMENT Oct 9, 2025 Oct 7, 2025
4 Open Document Open Filing Oct 9, 2025 Sep 13, 2024
S-3ASR Open Document | Data Open Filing S-3ASR Oct 8, 2025 333-290777
8-K Open Document | Data Open Filing FORM 8-K Oct 8, 2025 Oct 7, 2025 001-42270
SCHEDULE 13G/A Open Document Open Filing Sep 8, 2025 005-94625
8-K Open Document | Data Open Filing FORM 8-K Sep 2, 2025 Sep 2, 2025 001-42270
S-8 Open Document | Data Open Filing FORM S-8 Aug 12, 2025 333-289510
10-Q Open Document | Data Open Filing 10-Q Aug 12, 2025 Jun 30, 2025 001-42270
8-K Open Document | Data Open Filing FORM 8-K Aug 12, 2025 Aug 12, 2025 001-42270
SCHEDULE 13G/A Open Document Open Filing Aug 6, 2025 005-94625
4 Open Document Open Filing 4 Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Jun 12, 2025 Jun 10, 2025
8-K Open Document | Data Open Filing FORM 8-K Jun 12, 2025 Jun 10, 2025 001-42270
SCHEDULE 13D Open Document Open Filing Jun 6, 2025 005-94625
8-K Open Document | Data Open Filing FORM 8-K Jun 4, 2025 Jun 4, 2025 001-42270
10-Q Open Document | Data Open Filing 10-Q May 15, 2025 Mar 31, 2025 001-42270
8-K Open Document | Data Open Filing FORM 8-K May 15, 2025 May 15, 2025 001-42270
SCHEDULE 13G/A Open Document Open Filing May 12, 2025 005-94625
4/A Open Document Open Filing OWNERSHIP DOCUMENT Apr 28, 2025 Feb 7, 2025
ARS Open Document Open Filing ARS Apr 28, 2025 Dec 31, 2024 001-42270
DEFA14A Open Document Open Filing DEFA14A Apr 28, 2025 001-42270
DEF 14A Open Document | Data Open Filing DEF 14A Apr 28, 2025 Jun 10, 2025 001-42270
4 Open Document Open Filing OWNERSHIP DOCUMENT Apr 17, 2025 Apr 15, 2025
SCHEDULE 13G Open Document Open Filing Apr 1, 2025 005-94625
3 Open Document Open Filing OWNERSHIP DOCUMENT Mar 21, 2025 Mar 17, 2025
S-8 Open Document Open Filing FORM S-8 Mar 11, 2025 333-285694
10-K Open Document | Data Open Filing 10-K Mar 11, 2025 Dec 31, 2024 001-42270
4 Open Document Open Filing OWNERSHIP DOCUMENT Feb 19, 2025 Feb 18, 2025
4 Open Document Open Filing OWNERSHIP DOCUMENT Feb 11, 2025 Feb 7, 2025
8-K Open Document | Data Open Filing FORM 8-K Feb 5, 2025 Feb 5, 2025 001-42270
4 Open Document Open Filing OWNERSHIP DOCUMENT Dec 18, 2024 Dec 16, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Dec 18, 2024 Dec 16, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Dec 4, 2024 Dec 3, 2024
8-K Open Document | Data Open Filing FORM 8-K Dec 2, 2024 Dec 2, 2024 001-42270
4 Open Document Open Filing OWNERSHIP DOCUMENT Nov 20, 2024 Nov 18, 2024
SC 13G Open Document Open Filing Nov 12, 2024 005-94625
10-Q Open Document | Data Open Filing 10-Q Nov 12, 2024 Sep 30, 2024 001-42270
8-K Open Document | Data Open Filing FORM 8-K Nov 12, 2024 Nov 12, 2024 001-42270
SC 13G Open Document Open Filing SC 13G Oct 21, 2024 005-94625
SC 13G Open Document Open Filing NEA 18 VENTURE GROWTH EQUITY, L.P. -- ZENAS BIOPHARMA, INC. 13G Sep 25, 2024 005-94625
SC 13D Open Document Open Filing SC 13D Sep 23, 2024 005-94625
SC 13D Open Document Open Filing SC 13D Sep 23, 2024 005-94625
SC 13D Open Document Open Filing SC 13D Sep 23, 2024 005-94625
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 20, 2024 Sep 18, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 18, 2024 Sep 16, 2024
4 Open Document Open Filing Sep 18, 2024 Sep 16, 2024
4/A Open Document Open Filing OWNERSHIP DOCUMENT Sep 17, 2024 Sep 12, 2024
4/A Open Document Open Filing OWNERSHIP DOCUMENT Sep 17, 2024 Sep 12, 2024
4 Open Document Open Filing Sep 17, 2024 Sep 13, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing 4 Sep 16, 2024 Sep 16, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing 4 Sep 16, 2024 Sep 16, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
4 Open Document Open Filing OWNERSHIP DOCUMENT Sep 16, 2024 Sep 12, 2024
S-8 Open Document Open Filing FORM S-8 Sep 16, 2024 333-282151
8-K Open Document | Data Open Filing FORM 8-K Sep 16, 2024 Sep 16, 2024 001-42270
424B4 Open Document Open Filing 424B4 Sep 13, 2024 333-281713
SEC STAFF LETTER Open Document Open Filing Sep 12, 2024
EFFECT Open Document Open Filing Sep 12, 2024 333-281713
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing 3 Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing 3 Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
3 Open Document Open Filing OWNERSHIP DOCUMENT Sep 12, 2024 Sep 12, 2024
S-1MEF Open Document Open Filing S-1MEF Sep 12, 2024 333-282082
CERT Open Document Open Filing Sep 12, 2024 001-42270
8-A12B Open Document Open Filing 8-A12B Sep 10, 2024 001-42270
CORRESP Open Document Open Filing Sep 10, 2024
CORRESP Open Document Open Filing Sep 10, 2024
S-1/A Open Document Open Filing S-1/A Sep 6, 2024 333-281713
CORRESP Open Document Open Filing Aug 27, 2024
S-1 Open Document Open Filing S-1 Aug 22, 2024 333-281713
DRSLTR Open Document Open Filing Jul 25, 2024
UPLOAD Open Document Open Filing Jul 24, 2024 377-07069
DRSLTR Open Document Open Filing Jul 16, 2024
UPLOAD Open Document Open Filing Jul 5, 2024 377-07069
DRSLTR Open Document Open Filing Jun 26, 2024
DRS/A Open Document Open Filing Jun 26, 2024 377-07069
UPLOAD Open Document Open Filing Jun 18, 2024 377-07069
DRSLTR Open Document Open Filing Jun 14, 2024
DRS/A Open Document Open Filing Jun 14, 2024 377-07069
UPLOAD Open Document Open Filing May 28, 2024 377-07069
DRS/A Open Document Open Filing May 16, 2024 377-07069
DRSLTR Open Document Open Filing May 15, 2024
D Open Document Open Filing May 14, 2024 021-513274
SEC STAFF LETTER Open Document Open Filing Feb 21, 2024
UPLOAD Open Document Open Filing Feb 21, 2024 377-07069
DRS Open Document Open Filing Jan 25, 2024 377-07069
D Open Document Open Filing Nov 15, 2022 021-464885