Filer Snapshot

Boundless Bio, Inc. SEC EDGAR Filings

SEC filings, ownership reports, and insider transactions for CIK 0001782303.

Entity Type

Company

Total Filings

125

Latest Filing

28 Apr 2026

Industry

Pharmaceutical Preparations

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Source: SEC filing ARS

ARS filed on 28 Apr 2026 for CIK 0001782303.

View Source Filing
Symbol
BOLD on Nasdaq
Industry
Pharmaceutical Preparations (Office Of Life Sciences)
Business address
10955 Alexandria Way, Suite 100, San Diego, CA, 92121
State of incorporation
DE
Fiscal year end
31 December

Quick Takeaways

  • Boundless Bio, Inc. is an SEC filer tracked under CIK 0001782303.
  • 125 filings are listed on this profile.
  • Common form coverage includes ARS, DEFA14A, DEF 14A and more.

What Changed

  • Latest filing: ARS filed on 28 Apr 2026.
  • Report period: 31 Dec 2025.

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 ARS

ARS filed on 28 Apr 2026 for CIK 0001782303.

View Source Filing

Return Loop

Why revisit this filer page

A newly filed ARS can change the filing history, ownership context, or next research path for Boundless Bio, Inc..

Latest source-backed update
ARS filed 28 Apr 2026
Why come back
Revisit after a new SEC filing appears to compare the updated record with prior filings.
  • Latest filing on record: ARS filed 28 Apr 2026.
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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 Boundless Bio, Inc.

New fact period available

Latest financial period: Q4 2025. Open the source-backed page to inspect the fresh filing or facts context.

Update date

09 Mar 2026

Page type

Company facts

Latest period

Q4 2025

SEC-backed company facts were refreshed from filings filed on 09 Mar 2026.

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Benchmark Context

Benchmark context for this company

Boundless Bio, 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.

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Why this is notable

Latest financial period: Q4 2025. That gives you a fresh baseline before you compare this company with peers.

  • Latest company facts filing date: 09 Mar 2026.
  • Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
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Filer Overview

Boundless Bio, Inc. has filed 125 SEC EDGAR filings since 12 Mar 2020. Common forms include ARS, DEFA14A, DEF 14A, 8-K and more.

Pharmaceutical Preparations Insider transactions Latest 13F filings

Latest Filings

Recent SEC filings for Boundless Bio, Inc. with direct links to document and filing folders.

Form type Document Filing Description Filing date Reporting date File number(s)
ARS Open ARS document View SEC filing for ARS ARS 28 Apr 2026 31 Dec 2025 001-41989
DEFA14A Open DEFA14A document View SEC filing for DEFA14A DEFA14A 28 Apr 2026 001-41989
DEF 14A Open DEF 14A document | Open XBRL data View SEC filing for DEF 14A DEF 14A 28 Apr 2026 15 Jun 2026 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 13 Apr 2026 13 Apr 2026 001-41989
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 09 Mar 2026 31 Dec 2025 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 09 Mar 2026 03 Mar 2026 001-41989
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 17 Feb 2026 005-94492
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 05 Feb 2026 005-94492
4 Open 4 document View SEC filing for 4 4 26 Jan 2026 23 Jan 2026
4 Open 4 document View SEC filing for 4 4 26 Jan 2026 23 Jan 2026
4 Open 4 document View SEC filing for 4 4 26 Jan 2026 23 Jan 2026
4 Open 4 document View SEC filing for 4 4 26 Jan 2026 23 Jan 2026
4 Open 4 document View SEC filing for 4 4 26 Jan 2026 23 Jan 2026
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 04 Dec 2025 005-94492
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 05 Nov 2025 30 Sep 2025 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 05 Nov 2025 05 Nov 2025 001-41989
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 14 Aug 2025 005-94492
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 05 Aug 2025 30 Jun 2025 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 05 Aug 2025 05 Aug 2025 001-41989
4 Open 4 document View SEC filing for 4 4 23 Jun 2025 23 Jun 2025
4 Open 4 document View SEC filing for 4 4 23 Jun 2025 23 Jun 2025
4 Open 4 document View SEC filing for 4 4 23 Jun 2025 23 Jun 2025
4 Open 4 document View SEC filing for 4 4 23 Jun 2025 23 Jun 2025
4 Open 4 document View SEC filing for 4 4 23 Jun 2025 23 Jun 2025
4 Open 4 document View SEC filing for 4 4 23 Jun 2025 23 Jun 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 23 Jun 2025 23 Jun 2025 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 23 May 2025 23 May 2025 001-41989
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 09 May 2025 31 Mar 2025 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 09 May 2025 09 May 2025 001-41989
ARS Open ARS document View SEC filing for ARS ARS 29 Apr 2025 31 Dec 2024 001-41989
DEFA14A Open DEFA14A document View SEC filing for DEFA14A DEFA14A 29 Apr 2025 001-41989
DEF 14A Open DEF 14A document | Open XBRL data View SEC filing for DEF 14A DEF 14A 29 Apr 2025 23 Jun 2025 001-41989
EFFECT Open EFFECT document View SEC filing for EFFECT 10 Apr 2025 333-286302
CORRESP Open CORRESP document View SEC filing for CORRESP 08 Apr 2025
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 08 Apr 2025 333-286302
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 01 Apr 2025 01 Apr 2025 001-41989
S-3 Open S-3 document View SEC filing for S-3 S-3 01 Apr 2025 333-286302
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 27 Mar 2025 31 Dec 2024 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 27 Mar 2025 27 Mar 2025 001-41989
4 Open 4 document View SEC filing for 4 4 03 Feb 2025 03 Feb 2025
3 Open 3 document View SEC filing for 3 3 03 Feb 2025 03 Feb 2025
4 Open 4 document View SEC filing for 4 4 23 Jan 2025 22 Jan 2025
4 Open 4 document View SEC filing for 4 4 23 Jan 2025 22 Jan 2025
4 Open 4 document View SEC filing for 4 4 23 Jan 2025 22 Jan 2025
4 Open 4 document View SEC filing for 4 4 23 Jan 2025 22 Jan 2025
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 23 Jan 2025 005-94492
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 12 Dec 2024 06 Dec 2024 001-41989
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 07 Nov 2024 30 Sep 2024 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 07 Nov 2024 07 Nov 2024 001-41989
SC 13D Open SC 13D document View SEC filing for SC 13D ARCH VENTURE FUND IX, L.P. - BOUNDLESS BIO -- SCH 13D 29 Oct 2024 005-94492
3 Open 3 document View SEC filing for 3 3 15 Oct 2024 11 Oct 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 15 Oct 2024 11 Oct 2024 001-41989
4 Open 4 document View SEC filing for 4 4 20 Aug 2024 19 Aug 2024
4 Open 4 document View SEC filing for 4 4 20 Aug 2024 19 Aug 2024
4 Open 4 document View SEC filing for 4 4 20 Aug 2024 19 Aug 2024
4 Open 4 document View SEC filing for 4 4 20 Aug 2024 19 Aug 2024
4 Open 4 document View SEC filing for 4 4 20 Aug 2024 19 Aug 2024
4 Open 4 document View SEC filing for 4 4 20 Aug 2024 19 Aug 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 20 Aug 2024 19 Aug 2024 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 12 Aug 2024 12 Aug 2024 001-41989
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 12 Aug 2024 30 Jun 2024 001-41989
4 Open 4 document View SEC filing for 4 4 20 Jun 2024 20 Jun 2024
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 13 May 2024 31 Mar 2024 001-41989
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 13 May 2024 13 May 2024 001-41989
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 12 Apr 2024 005-94492
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 12 Apr 2024 005-94492
SC 13G Open SC 13G document View SEC filing for SC 13G 10 Apr 2024 005-94492
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 09 Apr 2024 005-94492
4 Open 4 document View SEC filing for 4 4 04 Apr 2024 02 Apr 2024
4 Open 4 document View SEC filing for 4 4 04 Apr 2024 02 Apr 2024
4 Open 4 document View SEC filing for 4 4 04 Apr 2024 02 Apr 2024
4 Open 4 document View SEC filing for 4 4 04 Apr 2024 02 Apr 2024
4 Open 4 document View SEC filing for 4 04 Apr 2024 02 Apr 2024
4 Open 4 document View SEC filing for 4 02 Apr 2024 02 Apr 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 02 Apr 2024 02 Apr 2024 001-41989
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
4 Open 4 document View SEC filing for 4 4 29 Mar 2024 27 Mar 2024
S-8 Open S-8 document View SEC filing for S-8 S-8 28 Mar 2024 333-278354
424B4 Open 424B4 document View SEC filing for 424B4 424B4 28 Mar 2024 333-277696
EFFECT Open EFFECT document View SEC filing for EFFECT 27 Mar 2024 333-277696
3 Open 3 document View SEC filing for 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
3 Open 3 document View SEC filing for 3 3 27 Mar 2024 27 Mar 2024
CERT Open CERT document View SEC filing for CERT 27 Mar 2024 001-41989
CORRESP Open CORRESP document View SEC filing for CORRESP 25 Mar 2024
CORRESP Open CORRESP document View SEC filing for CORRESP 25 Mar 2024
8-A12B Open 8-A12B document View SEC filing for 8-A12B 8-A12B 22 Mar 2024 001-41989
S-1/A Open S-1/A document View SEC filing for S-1/A S-1/A 21 Mar 2024 333-277696
CORRESP Open CORRESP document View SEC filing for CORRESP 15 Mar 2024
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 13 Mar 2024 377-06851
CORRESP Open CORRESP document View SEC filing for CORRESP 08 Mar 2024
CORRESP Open CORRESP document View SEC filing for CORRESP 06 Mar 2024
S-1 Open S-1 document View SEC filing for S-1 S-1 06 Mar 2024 333-277696
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 29 Jan 2024 377-06851
DRS/A Open DRS/A document View SEC filing for DRS/A 23 Jan 2024 377-06851
DRSLTR Open DRSLTR document View SEC filing for DRSLTR 11 Oct 2023
DRS/A Open DRS/A document View SEC filing for DRS/A 11 Oct 2023 377-06851
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 29 Sep 2023 377-06851
DRS Open DRS document View SEC filing for DRS 01 Sep 2023 377-06851
D Open D document View SEC filing for D 15 Aug 2023 021-489721
D Open D document View SEC filing for D 04 May 2021 021-398232
D Open D document View SEC filing for D 12 Mar 2020 021-362715

About this filer

Boundless Bio, Inc. files with the SEC under CIK 0001782303. 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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