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.

View Source Filing
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

Key facts

  • 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.

Change

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

Research use

  • 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.

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
Why come back
Revisit after a new SEC filing appears to compare the updated record with prior filings.
  • Latest filing on record: 15-12G filed 26 Feb 2024.
  • Save this filer if you want a stable place to return after the next filing cycle.
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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

Benchmark context for this company

Theseus Pharmaceuticals, Inc. has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.

Compared with

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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.
  • Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
  • Open the facts page first if you want the cleanest path to verification.

Benchmark context is only shown where the app has enough comparable SEC-backed data to keep the interpretation honest.

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Company intelligence

Theseus Pharmaceuticals, Inc.: filings, ownership, insiders

CIK 0001745020. Open the active data lane, then verify the SEC filing behind the row.

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Active modules

3/5

Available company intelligence paths on this page.

Filings

181

SEC submissions provide the evidence trail.

Ownership context

1/3

Insider, large-stake, and institutional ownership lanes.

Return loop

Watch

Return when a new SEC-backed change lands.

Research checks

Latest filing

15-12G filed 26 Feb 2024

Ownership lanes

1/3 active

CIK

0001745020

Next review

watch new filing, insider, 13D/G, or 13F change

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SEC filings

Available

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Company facts

Available

Financial context

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Forms 3/4/5

Available

Insider activity

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Schedule 13D/G

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Large-stake holders

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Form 13F

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Watchlist return triggers

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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.

Theseus Pharmaceuticals, Inc. SEC filings Theseus Pharmaceuticals, Inc. insider transactions Theseus Pharmaceuticals, Inc. company facts

Latest Filings

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

15-12G File 001-40869

15-12G

Filing date
26 Feb 2024
Reporting date
Not listed
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 3

Filing date
16 Feb 2024
Reporting date
Not listed
SEC evidence
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EFFECT File 333-268125

EFFECT filing

Filing date
15 Feb 2024
Reporting date
Not listed
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
14 Feb 2024
Reporting date
14 Feb 2024
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
14 Feb 2024
Reporting date
14 Feb 2024
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
14 Feb 2024
Reporting date
14 Feb 2024
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
14 Feb 2024
Reporting date
14 Feb 2024
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
14 Feb 2024
Reporting date
14 Feb 2024
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
14 Feb 2024
Reporting date
14 Feb 2024
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
14 Feb 2024
Reporting date
14 Feb 2024
SEC evidence
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S-8 POS File 333-270382

S-8 POS

Filing date
14 Feb 2024
Reporting date
Not listed
SEC evidence
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S-8 POS File 333-260158

S-8 POS

Filing date
14 Feb 2024
Reporting date
Not listed
SEC evidence
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POS AM File 333-268125

POS AM

Filing date
14 Feb 2024
Reporting date
Not listed
SEC evidence
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SC TO-T/A File 005-92944

FORM SC TO-T/A

Filing date
14 Feb 2024
Reporting date
Not listed
SEC evidence
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SC 14D9/A File 005-92944

SC 14D9/A

Filing date
14 Feb 2024
Reporting date
Not listed
SEC evidence
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25-NSE File 001-40869

25-NSE filing

Filing date
14 Feb 2024
Reporting date
Not listed
SEC evidence
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SC 13G/A File 005-92944

SC 13G/A

Filing date
13 Feb 2024
Reporting date
Not listed
SEC evidence
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CORRESP

CORRESP filing

Filing date
07 Feb 2024
Reporting date
Not listed
SEC evidence
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SC 14D9/A File 005-92944

SC 14D9/A

Filing date
07 Feb 2024
Reporting date
Not listed
SEC evidence
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SC TO-T/A File 005-92944

FORM SC TO-T/A

Filing date
07 Feb 2024
Reporting date
Not listed
SEC evidence
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UPLOAD File 005-92944

UPLOAD filing

Filing date
02 Feb 2024
Reporting date
Not listed
SEC evidence
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UPLOAD File 005-92944

UPLOAD filing

Filing date
02 Feb 2024
Reporting date
Not listed
SEC evidence
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CORRESP

CORRESP filing

Filing date
30 Jan 2024
Reporting date
Not listed
SEC evidence
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SC 14D9/A File 005-92944

SC 14D9/A

Filing date
30 Jan 2024
Reporting date
Not listed
SEC evidence
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SC TO-T/A File 005-92944

SC TO-T/A

Filing date
30 Jan 2024
Reporting date
Not listed
SEC evidence
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UPLOAD File 005-92944

UPLOAD filing

Filing date
22 Jan 2024
Reporting date
Not listed
SEC evidence
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UPLOAD File 005-92944

UPLOAD filing

Filing date
22 Jan 2024
Reporting date
Not listed
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 2

Filing date
12 Jan 2024
Reporting date
Not listed
SEC evidence
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SC 14D9 File 005-92944

SC 14D9

Filing date
10 Jan 2024
Reporting date
Not listed
SEC evidence
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SC TO-T File 005-92944

SC TO-T

Filing date
09 Jan 2024
Reporting date
Not listed
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 1

Filing date
28 Dec 2023
Reporting date
Not listed
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 5

Filing date
27 Dec 2023
Reporting date
Not listed
SEC evidence
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SC14D9C File 005-92944

SC14D9C

Filing date
22 Dec 2023
Reporting date
Not listed
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 4

Filing date
24 Nov 2023
Reporting date
Not listed
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 4

Filing date
24 Nov 2023
Reporting date
Not listed
SEC evidence
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SC 13D File 005-92944

SC 13D filing

Filing date
24 Nov 2023
Reporting date
Not listed
SEC evidence
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NT 10-Q File 001-40869

NT 10-Q

Filing date
15 Nov 2023
Reporting date
30 Sep 2023
SEC evidence
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4

FORM 4

Filing date
07 Nov 2023
Reporting date
06 Nov 2023
SEC evidence
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SC 13G/A File 005-92944

SC 13G/A filing

Filing date
10 Aug 2023
Reporting date
Not listed
SEC evidence
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4

4 filing

Filing date
19 Jul 2023
Reporting date
17 Jul 2023
SEC evidence
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4

4 filing

Filing date
19 Jul 2023
Reporting date
17 Jul 2023
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 3

Filing date
19 Jul 2023
Reporting date
Not listed
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
19 Jul 2023
Reporting date
17 Jul 2023
SEC evidence
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SC 13D/A File 005-92944

SC 13D/A

Filing date
19 Jul 2023
Reporting date
Not listed
SEC evidence
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4

FORM 4

Filing date
13 Jun 2023
Reporting date
13 Jun 2023
SEC evidence
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4

FORM 4

Filing date
13 Jun 2023
Reporting date
13 Jun 2023
SEC evidence
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4

FORM 4

Filing date
13 Jun 2023
Reporting date
13 Jun 2023
SEC evidence
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4

FORM 4

Filing date
13 Jun 2023
Reporting date
13 Jun 2023
SEC evidence
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4

FORM 4

Filing date
13 Jun 2023
Reporting date
13 Jun 2023
SEC evidence
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ARS File 001-40869

ARS

Filing date
26 Apr 2023
Reporting date
31 Dec 2022
SEC evidence
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DEFA14A File 001-40869

DEFA14A

Filing date
26 Apr 2023
Reporting date
Not listed
SEC evidence
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DEF 14A File 001-40869

DEF 14A

Filing date
26 Apr 2023
Reporting date
09 Jun 2023
SEC evidence
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PRE 14A File 001-40869

PRE 14A

Filing date
14 Apr 2023
Reporting date
09 Jun 2023
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 2

Filing date
14 Mar 2023
Reporting date
Not listed
SEC evidence
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S-8 File 333-270382

FORM S-8

Filing date
09 Mar 2023
Reporting date
Not listed
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Mar 2023
Reporting date
01 Mar 2023
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Mar 2023
Reporting date
01 Mar 2023
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Mar 2023
Reporting date
01 Mar 2023
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Mar 2023
Reporting date
01 Mar 2023
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
02 Mar 2023
Reporting date
01 Mar 2023
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
21 Feb 2023
Reporting date
17 Feb 2023
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
21 Feb 2023
Reporting date
17 Feb 2023
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
21 Feb 2023
Reporting date
17 Feb 2023
SEC evidence
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Next action
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4

OWNERSHIP DOCUMENT

Filing date
21 Feb 2023
Reporting date
17 Feb 2023
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
21 Feb 2023
Reporting date
17 Feb 2023
SEC evidence
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SC 13G/A File 005-92944

SC 13G/A filing

Filing date
09 Feb 2023
Reporting date
Not listed
SEC evidence
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SC 13G File 005-92944

SC 13G

Filing date
23 Jan 2023
Reporting date
Not listed
SEC evidence
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SC 13D/A File 005-92944

SC 13D/A

Filing date
03 Jan 2023
Reporting date
Not listed
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
03 Jan 2023
Reporting date
29 Dec 2022
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
03 Jan 2023
Reporting date
29 Dec 2022
SEC evidence
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SC 13G/A File 005-92944

SC 13G/A filing

Filing date
12 Dec 2022
Reporting date
Not listed
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
01 Dec 2022
Reporting date
30 Nov 2022
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
14 Nov 2022
Reporting date
11 Nov 2022
SEC evidence
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EFFECT File 333-268125

EFFECT filing

Filing date
10 Nov 2022
Reporting date
Not listed
SEC evidence
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4

4 filing

Filing date
09 Nov 2022
Reporting date
07 Nov 2022
SEC evidence
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4

4 filing

Filing date
09 Nov 2022
Reporting date
07 Nov 2022
SEC evidence
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CORRESP

CORRESP filing

Filing date
08 Nov 2022
Reporting date
Not listed
SEC evidence
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UPLOAD

UPLOAD filing

Filing date
08 Nov 2022
Reporting date
Not listed
SEC evidence
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S-3 File 333-268125

S-3

Filing date
03 Nov 2022
Reporting date
Not listed
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
19 Oct 2022
Reporting date
17 Oct 2022
SEC evidence
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3

OWNERSHIP DOCUMENT

Filing date
19 Oct 2022
Reporting date
17 Oct 2022
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
13 Jun 2022
Reporting date
10 Jun 2022
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
13 Jun 2022
Reporting date
10 Jun 2022
SEC evidence
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4

OWNERSHIP DOCUMENT

Filing date
13 Jun 2022
Reporting date
10 Jun 2022
SEC evidence
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3

FORM 3 SUBMISSION

Filing date
13 Jun 2022
Reporting date
09 Jun 2022
SEC evidence
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SC 13D/A File 005-92944

SC 13D/A

Filing date
13 Jun 2022
Reporting date
Not listed
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
18 May 2022
Reporting date
17 May 2022
SEC evidence
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3

FORM 3 SUBMISSION

Filing date
18 May 2022
Reporting date
17 May 2022
SEC evidence
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DEFA14A File 001-40869

DEFA14A

Filing date
25 Apr 2022
Reporting date
Not listed
SEC evidence
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DEF 14A File 001-40869

DEF 14A

Filing date
25 Apr 2022
Reporting date
10 Jun 2022
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
23 Feb 2022
Reporting date
18 Feb 2022
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
23 Feb 2022
Reporting date
18 Feb 2022
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
23 Feb 2022
Reporting date
18 Feb 2022
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
23 Feb 2022
Reporting date
18 Feb 2022
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
23 Feb 2022
Reporting date
18 Feb 2022
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
23 Feb 2022
Reporting date
18 Feb 2022
SEC evidence
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SC 13G/A File 005-92944

SC 13G/A filing

Filing date
09 Feb 2022
Reporting date
Not listed
SEC evidence
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4

4 filing

Filing date
21 Jan 2022
Reporting date
19 Jan 2022
SEC evidence
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4

4 filing

Filing date
21 Jan 2022
Reporting date
19 Jan 2022
SEC evidence
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4

4 filing

Filing date
13 Jan 2022
Reporting date
11 Jan 2022
SEC evidence
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4

4 filing

Filing date
13 Jan 2022
Reporting date
11 Jan 2022
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
22 Dec 2021
Reporting date
21 Dec 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
22 Dec 2021
Reporting date
21 Dec 2021
SEC evidence
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SC 13D/A File 005-92944

AMENDMENT NO. 1

Filing date
18 Nov 2021
Reporting date
Not listed
SEC evidence
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SC 13G File 005-92944

SC 13G filing

Filing date
10 Nov 2021
Reporting date
Not listed
SEC evidence
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8-K File 001-40869

8-K

Filing date
27 Oct 2021
Reporting date
25 Oct 2021
SEC evidence
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SC 13D File 005-92944

SCHEDULE 13D

Filing date
19 Oct 2021
Reporting date
Not listed
SEC evidence
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SC 13D File 005-92944

SC 13D

Filing date
18 Oct 2021
Reporting date
Not listed
SEC evidence
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4

FORM 4

Filing date
15 Oct 2021
Reporting date
12 Oct 2021
SEC evidence
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3

FORM 3

Filing date
15 Oct 2021
Reporting date
06 Oct 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
14 Oct 2021
Reporting date
12 Oct 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
14 Oct 2021
Reporting date
12 Oct 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
14 Oct 2021
Reporting date
12 Oct 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
14 Oct 2021
Reporting date
12 Oct 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
14 Oct 2021
Reporting date
12 Oct 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
08 Oct 2021
Reporting date
06 Oct 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
08 Oct 2021
Reporting date
06 Oct 2021
SEC evidence
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4

FORM 4 SUBMISSION

Filing date
08 Oct 2021
Reporting date
06 Oct 2021
SEC evidence
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S-8 File 333-260158

S-8

Filing date
08 Oct 2021
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424B4 File 333-259549

424B4

Filing date
07 Oct 2021
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SEC STAFF LETTER

SEC STAFF LETTER filing

Filing date
06 Oct 2021
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EFFECT File 333-259549

EFFECT filing

Filing date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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S-1MEF File 333-260102

S-1MEF

Filing date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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3

FORM 3 SUBMISSION

Filing date
06 Oct 2021
Reporting date
06 Oct 2021
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CERT File 001-40869

CERT filing

Filing date
06 Oct 2021
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CORRESP

CORRESP filing

Filing date
04 Oct 2021
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CORRESP

CORRESP filing

Filing date
04 Oct 2021
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8-A12B File 001-40869

8-A12B

Filing date
01 Oct 2021
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S-1/A File 333-259549

S-1/A

Filing date
30 Sep 2021
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S-1 File 333-259549

S-1

Filing date
15 Sep 2021
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SEC STAFF LETTER

SEC STAFF LETTER filing

Filing date
30 Aug 2021
Reporting date
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DRSLTR

DRSLTR filing

Filing date
23 Aug 2021
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DRS/A File 377-05224

DRS/A filing

Filing date
23 Aug 2021
Reporting date
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UPLOAD

UPLOAD filing

Filing date
11 Aug 2021
Reporting date
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DRS File 377-05224

DRS filing

Filing date
20 Jul 2021
Reporting date
Not listed
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D File 021-388439

D filing

Filing date
04 Feb 2021
Reporting date
Not listed
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D/A File 021-315789

D/A filing

Filing date
04 Feb 2021
Reporting date
Not listed
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D File 021-315789

D filing

Filing date
29 Jun 2018
Reporting date
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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.
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