Filer Snapshot

Theseus Pharmaceuticals, Inc. SEC EDGAR Filings

SEC filings, ownership reports, and insider transactions for CIK 0001745020.

Entity Type

Company

Total Filings

181

Latest Filing

26 Feb 2024

Industry

Pharmaceutical Preparations

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Source: SEC filing 15-12G

15-12G filed on 26 Feb 2024 for CIK 0001745020.

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Industry
Pharmaceutical Preparations (Office Of Life Sciences)
Business address
314 Main Street, Suite 04 200, Cambridge, MA, 02142
State of incorporation
DE
Fiscal year end
31 December

Quick Takeaways

  • Theseus Pharmaceuticals, Inc. is an SEC filer tracked under CIK 0001745020.
  • 181 filings are listed on this profile.
  • Common form coverage includes 15-12G, SC 13D/A, EFFECT and more.

What Changed

  • Latest filing: 15-12G filed on 26 Feb 2024.
  • Report period: not specified in filing header.

Why This Matters

  • You can quote filing dates and form types directly from the SEC record on this page.
  • Use this profile before deeper ownership or insider analysis to confirm filing history context.

Source Evidence

Source: SEC filing 15-12G

15-12G filed on 26 Feb 2024 for CIK 0001745020.

View Source Filing

Return Loop

Why revisit this filer page

A newly filed 15-12G can change the filing history, ownership context, or next research path for Theseus Pharmaceuticals, Inc..

Latest source-backed update
15-12G filed 26 Feb 2024
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  • Latest filing on record: 15-12G filed 26 Feb 2024.
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Filer freshness comes from SEC EDGAR submission history and related source-backed ownership or portfolio filings when available.

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Latest update

What changed recently for Theseus Pharmaceuticals, Inc.

New fact period available

Latest financial period: Q3 2023. Open the source-backed page to inspect the fresh filing or facts context.

Update date

17 Nov 2023

Page type

Company facts

Latest period

Q3 2023

SEC-backed company facts were refreshed from filings filed on 17 Nov 2023.

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Benchmark Context

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Why this is notable

Latest financial period: Q3 2023. That gives you a fresh baseline before you compare this company with peers.

  • Latest company facts filing date: 17 Nov 2023.
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Filer Overview

Theseus Pharmaceuticals, Inc. has filed 181 SEC EDGAR filings since 29 Jun 2018. Common forms include 15-12G, SC 13D/A, EFFECT, 4 and more.

Pharmaceutical Preparations Insider transactions Latest 13F filings

Latest Filings

Recent SEC filings for Theseus Pharmaceuticals, Inc. with direct links to document and filing folders.

Form type Document Filing Description Filing date Reporting date File number(s)
15-12G Open 15-12G document View SEC filing for 15-12G 15-12G 26 Feb 2024 001-40869
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 3 16 Feb 2024 005-92944
EFFECT Open EFFECT document View SEC filing for EFFECT 15 Feb 2024 333-268125
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 14 Feb 2024 14 Feb 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 14 Feb 2024 14 Feb 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 14 Feb 2024 14 Feb 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 14 Feb 2024 14 Feb 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 14 Feb 2024 14 Feb 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 14 Feb 2024 14 Feb 2024
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 14 Feb 2024 14 Feb 2024
S-8 POS Open S-8 POS document View SEC filing for S-8 POS S-8 POS 14 Feb 2024 333-270382
S-8 POS Open S-8 POS document View SEC filing for S-8 POS S-8 POS 14 Feb 2024 333-260158
POS AM Open POS AM document View SEC filing for POS AM POS AM 14 Feb 2024 333-268125
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 14 Feb 2024 14 Feb 2024 001-40869
SC TO-T/A Open SC TO-T/A document View SEC filing for SC TO-T/A FORM SC TO-T/A 14 Feb 2024 005-92944
SC 14D9/A Open SC 14D9/A document View SEC filing for SC 14D9/A SC 14D9/A 14 Feb 2024 005-92944
25-NSE Open 25-NSE document View SEC filing for 25-NSE 14 Feb 2024 001-40869
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SC 13G/A 13 Feb 2024 005-92944
CORRESP Open CORRESP document View SEC filing for CORRESP 07 Feb 2024
SC 14D9/A Open SC 14D9/A document View SEC filing for SC 14D9/A SC 14D9/A 07 Feb 2024 005-92944
SC TO-T/A Open SC TO-T/A document View SEC filing for SC TO-T/A FORM SC TO-T/A 07 Feb 2024 005-92944
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 02 Feb 2024 005-92944
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 02 Feb 2024 005-92944
CORRESP Open CORRESP document View SEC filing for CORRESP 30 Jan 2024
SC 14D9/A Open SC 14D9/A document View SEC filing for SC 14D9/A SC 14D9/A 30 Jan 2024 005-92944
SC TO-T/A Open SC TO-T/A document View SEC filing for SC TO-T/A SC TO-T/A 30 Jan 2024 005-92944
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 22 Jan 2024 005-92944
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 22 Jan 2024 005-92944
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 2 12 Jan 2024 005-92944
SC 14D9 Open SC 14D9 document View SEC filing for SC 14D9 SC 14D9 10 Jan 2024 005-92944
SC TO-T Open SC TO-T document View SEC filing for SC TO-T SC TO-T 09 Jan 2024 005-92944
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 1 28 Dec 2023 005-92944
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 5 27 Dec 2023 005-92944
SC14D9C Open SC14D9C document View SEC filing for SC14D9C SC14D9C 22 Dec 2023 005-92944
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 22 Dec 2023 21 Dec 2023 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 04 Dec 2023 29 Nov 2023 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 27 Nov 2023 22 Nov 2023 001-40869
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 4 24 Nov 2023 005-92944
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 4 24 Nov 2023 005-92944
SC 13D Open SC 13D document View SEC filing for SC 13D 24 Nov 2023 005-92944
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 17 Nov 2023 30 Sep 2023 001-40869
NT 10-Q Open NT 10-Q document View SEC filing for NT 10-Q NT 10-Q 15 Nov 2023 30 Sep 2023 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 13 Nov 2023 06 Nov 2023 001-40869
4 Open 4 document View SEC filing for 4 FORM 4 07 Nov 2023 06 Nov 2023
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 31 Oct 2023 27 Oct 2023 001-40869
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 10 Aug 2023 005-92944
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 10 Aug 2023 30 Jun 2023 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 10 Aug 2023 10 Aug 2023 001-40869
4 Open 4 document View SEC filing for 4 19 Jul 2023 17 Jul 2023
4 Open 4 document View SEC filing for 4 19 Jul 2023 17 Jul 2023
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 3 19 Jul 2023 005-92944
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 19 Jul 2023 17 Jul 2023
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A SC 13D/A 19 Jul 2023 005-92944
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 13 Jul 2023 13 Jul 2023 001-40869
4 Open 4 document View SEC filing for 4 FORM 4 13 Jun 2023 13 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 13 Jun 2023 13 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 13 Jun 2023 13 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 13 Jun 2023 13 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 13 Jun 2023 13 Jun 2023
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 09 Jun 2023 09 Jun 2023 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 25 May 2023 25 May 2023 001-40869
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 11 May 2023 31 Mar 2023 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 11 May 2023 11 May 2023 001-40869
ARS Open ARS document View SEC filing for ARS ARS 26 Apr 2023 31 Dec 2022 001-40869
DEFA14A Open DEFA14A document View SEC filing for DEFA14A DEFA14A 26 Apr 2023 001-40869
DEF 14A Open DEF 14A document View SEC filing for DEF 14A DEF 14A 26 Apr 2023 09 Jun 2023 001-40869
PRE 14A Open PRE 14A document View SEC filing for PRE 14A PRE 14A 14 Apr 2023 09 Jun 2023 001-40869
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 2 14 Mar 2023 005-92944
S-8 Open S-8 document View SEC filing for S-8 FORM S-8 09 Mar 2023 333-270382
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 09 Mar 2023 31 Dec 2022 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 09 Mar 2023 09 Mar 2023 001-40869
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 02 Mar 2023 01 Mar 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 02 Mar 2023 01 Mar 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 02 Mar 2023 01 Mar 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 02 Mar 2023 01 Mar 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 02 Mar 2023 01 Mar 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 21 Feb 2023 17 Feb 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 21 Feb 2023 17 Feb 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 21 Feb 2023 17 Feb 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 21 Feb 2023 17 Feb 2023
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 21 Feb 2023 17 Feb 2023
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 09 Feb 2023 005-92944
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 23 Jan 2023 005-92944
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 05 Jan 2023 05 Jan 2023 001-40869
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A SC 13D/A 03 Jan 2023 005-92944
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 03 Jan 2023 29 Dec 2022
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 03 Jan 2023 29 Dec 2022
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 12 Dec 2022 005-92944
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 01 Dec 2022 30 Nov 2022
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 14 Nov 2022 11 Nov 2022
EFFECT Open EFFECT document View SEC filing for EFFECT 10 Nov 2022 333-268125
4 Open 4 document View SEC filing for 4 09 Nov 2022 07 Nov 2022
4 Open 4 document View SEC filing for 4 09 Nov 2022 07 Nov 2022
CORRESP Open CORRESP document View SEC filing for CORRESP 08 Nov 2022
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 08 Nov 2022
S-3 Open S-3 document View SEC filing for S-3 S-3 03 Nov 2022 333-268125
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 03 Nov 2022 30 Sep 2022 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 03 Nov 2022 03 Nov 2022 001-40869
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 19 Oct 2022 17 Oct 2022
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 19 Oct 2022 17 Oct 2022
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K FORM 8-K 19 Oct 2022 17 Oct 2022 001-40869
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 11 Aug 2022 30 Jun 2022 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 11 Aug 2022 11 Aug 2022 001-40869
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 13 Jun 2022 10 Jun 2022
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 13 Jun 2022 10 Jun 2022
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 13 Jun 2022 10 Jun 2022
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 13 Jun 2022 09 Jun 2022
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 13 Jun 2022 10 Jun 2022 001-40869
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A SC 13D/A 13 Jun 2022 005-92944
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 18 May 2022 17 May 2022
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 18 May 2022 17 May 2022
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 18 May 2022 18 May 2022 001-40869
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 12 May 2022 31 Mar 2022 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 12 May 2022 12 May 2022 001-40869
DEFA14A Open DEFA14A document View SEC filing for DEFA14A DEFA14A 25 Apr 2022 001-40869
DEF 14A Open DEF 14A document View SEC filing for DEF 14A DEF 14A 25 Apr 2022 10 Jun 2022 001-40869
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 10 Mar 2022 31 Dec 2021 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 10 Mar 2022 10 Mar 2022 001-40869
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 23 Feb 2022 18 Feb 2022
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 23 Feb 2022 18 Feb 2022
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 23 Feb 2022 18 Feb 2022
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 23 Feb 2022 18 Feb 2022
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 23 Feb 2022 18 Feb 2022
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 23 Feb 2022 18 Feb 2022
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 09 Feb 2022 005-92944
4 Open 4 document View SEC filing for 4 21 Jan 2022 19 Jan 2022
4 Open 4 document View SEC filing for 4 21 Jan 2022 19 Jan 2022
4 Open 4 document View SEC filing for 4 13 Jan 2022 11 Jan 2022
4 Open 4 document View SEC filing for 4 13 Jan 2022 11 Jan 2022
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 10 Jan 2022 10 Jan 2022 001-40869
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 22 Dec 2021 21 Dec 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 22 Dec 2021 21 Dec 2021
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A AMENDMENT NO. 1 18 Nov 2021 005-92944
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 15 Nov 2021 30 Sep 2021 001-40869
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 15 Nov 2021 15 Nov 2021 001-40869
SC 13G Open SC 13G document View SEC filing for SC 13G 10 Nov 2021 005-92944
8-K Open 8-K document View SEC filing for 8-K 8-K 27 Oct 2021 25 Oct 2021 001-40869
SC 13D Open SC 13D document View SEC filing for SC 13D SCHEDULE 13D 19 Oct 2021 005-92944
SC 13D Open SC 13D document View SEC filing for SC 13D SC 13D 18 Oct 2021 005-92944
4 Open 4 document View SEC filing for 4 FORM 4 15 Oct 2021 12 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 15 Oct 2021 06 Oct 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Oct 2021 12 Oct 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Oct 2021 12 Oct 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Oct 2021 12 Oct 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Oct 2021 12 Oct 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Oct 2021 12 Oct 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 Oct 2021 06 Oct 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 Oct 2021 06 Oct 2021
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 Oct 2021 06 Oct 2021
S-8 Open S-8 document View SEC filing for S-8 S-8 08 Oct 2021 333-260158
424B4 Open 424B4 document View SEC filing for 424B4 424B4 07 Oct 2021 333-259549
SEC STAFF LETTER Open SEC STAFF LETTER document View SEC filing for SEC STAFF LETTER 06 Oct 2021
EFFECT Open EFFECT document View SEC filing for EFFECT 06 Oct 2021 333-259549
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
S-1MEF Open S-1MEF document View SEC filing for S-1MEF S-1MEF 06 Oct 2021 333-260102
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 06 Oct 2021 06 Oct 2021
CERT Open CERT document View SEC filing for CERT 06 Oct 2021 001-40869
CORRESP Open CORRESP document View SEC filing for CORRESP 04 Oct 2021
CORRESP Open CORRESP document View SEC filing for CORRESP 04 Oct 2021
8-A12B Open 8-A12B document View SEC filing for 8-A12B 8-A12B 01 Oct 2021 001-40869
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 30 Sep 2021 333-259549
S-1 Open S-1 document View SEC filing for S-1 S-1 15 Sep 2021 333-259549
SEC STAFF LETTER Open SEC STAFF LETTER document View SEC filing for SEC STAFF LETTER 30 Aug 2021
DRSLTR Open DRSLTR document View SEC filing for DRSLTR 23 Aug 2021
DRS/A Open DRS/A document View SEC filing for DRS/A 23 Aug 2021 377-05224
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 11 Aug 2021
DRS Open DRS document View SEC filing for DRS 20 Jul 2021 377-05224
D Open D document View SEC filing for D 04 Feb 2021 021-388439
D/A Open D/A document View SEC filing for D/A 04 Feb 2021 021-315789
D Open D document View SEC filing for D 29 Jun 2018 021-315789

About this filer

Theseus Pharmaceuticals, Inc. files with the SEC under CIK 0001745020. This page aggregates EDGAR filings and related ownership activity.

Industry: Pharmaceutical Preparations.

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.
How often is this page updated?
Updates follow new EDGAR submissions and periodic data refreshes.