Zenas BioPharma, Inc. SEC EDGAR Filings (CIK 0001953926)

SEC EDGAR filings, ownership reports, and insider transactions for 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
31 December
Former names
Zenas BioPharma (Cayman) Ltd (to 15 Nov 2022)
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Zenas BioPharma, Inc. has filed 136 SEC EDGAR filings since 15 Nov 2022

Latest Filings

Recent SEC filings for Zenas BioPharma, Inc. including SCHEDULE 13D, 4, 8-K and more.

Form type Document Filing Description Filing date Reporting date File number(s)
SCHEDULE 13D Open SCHEDULE 13D document View SEC filing for SCHEDULE 13D 14 Jan 2026 005-94625
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 09 Jan 2026 07 Jan 2026
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 05 Jan 2026 05 Jan 2026 001-42270
S-8 Open S-8 document | Open XBRL data View SEC filing for S-8 FORM S-8 19 Dec 2025 333-292309
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 15 Dec 2025 10 Dec 2025 001-42270
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 14 Nov 2025 005-94625
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 12 Nov 2025 30 Sep 2025 001-42270
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 12 Nov 2025 12 Nov 2025 001-42270
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 27 Oct 2025 27 Oct 2025 001-42270
S-3ASR Open S-3ASR document | Open XBRL data View SEC filing for S-3ASR S-3ASR 21 Oct 2025 333-290999
3 Open 3 document View SEC filing for 3 15 Oct 2025 07 Oct 2025
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 15 Oct 2025 005-94625
SCHEDULE 13D/A Open SCHEDULE 13D/A document View SEC filing for SCHEDULE 13D/A 14 Oct 2025 005-94625
SCHEDULE 13D/A Open SCHEDULE 13D/A document View SEC filing for SCHEDULE 13D/A 14 Oct 2025 005-94625
4 Open 4 document View SEC filing for 4 4 14 Oct 2025 09 Oct 2025
4 Open 4 document View SEC filing for 4 4 14 Oct 2025 09 Oct 2025
SCHEDULE 13D/A Open SCHEDULE 13D/A document View SEC filing for SCHEDULE 13D/A 14 Oct 2025 005-94625
4 Open 4 document View SEC filing for 4 4 14 Oct 2025 09 Oct 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 09 Oct 2025 07 Oct 2025
SCHEDULE 13D/A Open SCHEDULE 13D/A document View SEC filing for SCHEDULE 13D/A 09 Oct 2025 005-94625
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 09 Oct 2025 07 Oct 2025
4 Open 4 document View SEC filing for 4 09 Oct 2025 13 Sep 2024
S-3ASR Open S-3ASR document | Open XBRL data View SEC filing for S-3ASR S-3ASR 08 Oct 2025 333-290777
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 08 Oct 2025 07 Oct 2025 001-42270
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 08 Sep 2025 005-94625
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 02 Sep 2025 02 Sep 2025 001-42270
S-8 Open S-8 document | Open XBRL data View SEC filing for S-8 FORM S-8 12 Aug 2025 333-289510
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 12 Aug 2025 30 Jun 2025 001-42270
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 12 Aug 2025 12 Aug 2025 001-42270
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 06 Aug 2025 005-94625
4 Open 4 document View SEC filing for 4 4 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 12 Jun 2025 10 Jun 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 12 Jun 2025 10 Jun 2025 001-42270
SCHEDULE 13D Open SCHEDULE 13D document View SEC filing for SCHEDULE 13D 06 Jun 2025 005-94625
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 04 Jun 2025 04 Jun 2025 001-42270
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 15 May 2025 31 Mar 2025 001-42270
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 15 May 2025 15 May 2025 001-42270
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 12 May 2025 005-94625
4/A Open 4/A document View SEC filing for 4/A OWNERSHIP DOCUMENT 28 Apr 2025 07 Feb 2025
ARS Open ARS document View SEC filing for ARS ARS 28 Apr 2025 31 Dec 2024 001-42270
DEFA14A Open DEFA14A document View SEC filing for DEFA14A DEFA14A 28 Apr 2025 001-42270
DEF 14A Open DEF 14A document | Open XBRL data View SEC filing for DEF 14A DEF 14A 28 Apr 2025 10 Jun 2025 001-42270
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 17 Apr 2025 15 Apr 2025
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 01 Apr 2025 005-94625
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 21 Mar 2025 17 Mar 2025
S-8 Open S-8 document View SEC filing for S-8 FORM S-8 11 Mar 2025 333-285694
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 11 Mar 2025 31 Dec 2024 001-42270
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 19 Feb 2025 18 Feb 2025
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 11 Feb 2025 07 Feb 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 05 Feb 2025 05 Feb 2025 001-42270
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 04 Dec 2024 03 Dec 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 02 Dec 2024 02 Dec 2024 001-42270
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 20 Nov 2024 18 Nov 2024
SC 13G Open SC 13G document View SEC filing for SC 13G 12 Nov 2024 005-94625
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 12 Nov 2024 30 Sep 2024 001-42270
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 12 Nov 2024 12 Nov 2024 001-42270
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 21 Oct 2024 005-94625
SC 13G Open SC 13G document View SEC filing for SC 13G NEA 18 VENTURE GROWTH EQUITY, L.P. -- ZENAS BIOPHARMA, INC. 13G 25 Sep 2024 005-94625
SC 13D Open SC 13D document View SEC filing for SC 13D SC 13D 23 Sep 2024 005-94625
SC 13D Open SC 13D document View SEC filing for SC 13D SC 13D 23 Sep 2024 005-94625
SC 13D Open SC 13D document View SEC filing for SC 13D SC 13D 23 Sep 2024 005-94625
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 20 Sep 2024 18 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 18 Sep 2024 16 Sep 2024
4 Open 4 document View SEC filing for 4 18 Sep 2024 16 Sep 2024
4/A Open 4/A document View SEC filing for 4/A OWNERSHIP DOCUMENT 17 Sep 2024 12 Sep 2024
4/A Open 4/A document View SEC filing for 4/A OWNERSHIP DOCUMENT 17 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 17 Sep 2024 13 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 4 16 Sep 2024 16 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 4 16 Sep 2024 16 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 16 Sep 2024 12 Sep 2024
S-8 Open S-8 document View SEC filing for S-8 FORM S-8 16 Sep 2024 333-282151
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 16 Sep 2024 16 Sep 2024 001-42270
424B4 Open 424B4 document View SEC filing for 424B4 424B4 13 Sep 2024 333-281713
SEC STAFF LETTER Open SEC STAFF LETTER document View SEC filing for SEC STAFF LETTER 12 Sep 2024
EFFECT Open EFFECT document View SEC filing for EFFECT 12 Sep 2024 333-281713
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 3 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 3 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 12 Sep 2024 12 Sep 2024
S-1MEF Open S-1MEF document View SEC filing for S-1MEF S-1MEF 12 Sep 2024 333-282082
CERT Open CERT document View SEC filing for CERT 12 Sep 2024 001-42270
8-A12B Open 8-A12B document View SEC filing for 8-A12B 8-A12B 10 Sep 2024 001-42270
CORRESP Open CORRESP document View SEC filing for CORRESP 10 Sep 2024
CORRESP Open CORRESP document View SEC filing for CORRESP 10 Sep 2024
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 06 Sep 2024 333-281713
CORRESP Open CORRESP document View SEC filing for CORRESP 27 Aug 2024
S-1 Open S-1 document View SEC filing for S-1 S-1 22 Aug 2024 333-281713
DRSLTR Open DRSLTR document View SEC filing for DRSLTR 25 Jul 2024
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 24 Jul 2024 377-07069
DRSLTR Open DRSLTR document View SEC filing for DRSLTR 16 Jul 2024
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 05 Jul 2024 377-07069
DRSLTR Open DRSLTR document View SEC filing for DRSLTR 26 Jun 2024
DRS/A Open DRS/A document View SEC filing for DRS/A 26 Jun 2024 377-07069
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 18 Jun 2024 377-07069
DRSLTR Open DRSLTR document View SEC filing for DRSLTR 14 Jun 2024
DRS/A Open DRS/A document View SEC filing for DRS/A 14 Jun 2024 377-07069
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 28 May 2024 377-07069
DRS/A Open DRS/A document View SEC filing for DRS/A 16 May 2024 377-07069
DRSLTR Open DRSLTR document View SEC filing for DRSLTR 15 May 2024
D Open D document View SEC filing for D 14 May 2024 021-513274
SEC STAFF LETTER Open SEC STAFF LETTER document View SEC filing for SEC STAFF LETTER 21 Feb 2024
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 21 Feb 2024 377-07069
DRS Open DRS document View SEC filing for DRS 25 Jan 2024 377-07069
D Open D document View SEC filing for D 15 Nov 2022 021-464885

About this filer

Zenas BioPharma, Inc. files with the SEC under CIK 0001953926. This page aggregates EDGAR filings and related ownership activity.

Industry: Pharmaceutical Preparations.

See insider transactions for this issuer.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
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Updates follow new EDGAR submissions and periodic data refreshes.

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