SEC filingsOct 12, 2026 to Oct 19, 2026: insiders reported 840 purchases and sales across 212 companies.840 insider purchases and sales in 7 daysSee the filings →
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Company profile

BOLD

Boundless Bio, Inc.
NASDAQHealth Care

Latest close: 2.34 USD · Oct 16, 2026 · 1 year · split-adjusted

On the price, the facts of the public record■Insider buy□Insider sell●Results filed
With an account, also○dividends▲splits◌next earningswith an account

End-of-day prices provided by Twelve Data · One close per session; the series does not update during the trading day.

Latest on record

The most recent facts, as filed.

Up to three of the most recent, checkable facts already loaded on this page, each linked to its source.

  1. Aug 28, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
  2. Aug 26, 2026Reported sale · Form 4KEVIN TANG · $54.4KOpen the filing ↗
  3. Aug 7, 2026Quarterly report · 10-QFiled by the company itself.Open the filing ↗

In numbers

What this profile holds, counted.

Closes · 1 year250
SEC filings on record13813 flagged findings
Reported transactions (Form 4)80since Apr 2, 2024 · and 40 other holdings
Corporate events (8-K)14since Aug 20, 2024

What the record says

Description, identity and filings, each with its source.

Every block cites its source. The colour of a finding marks its category — which document, who filed it — not how much it matters.

SEC topics

Regulatory history

Topics detected in its SEC reports, with the original excerpt.

Each topic is assigned by a classifier over the full filing; the excerpts show where it was detected and are not always enough to verify it. Open the filing to read it in full.

  • 2026-06-23share offering or dilution eventrecentOpen filing ↗
    “…with the execution and delivery of the Merger Agreement, certain institutional and accredited investors have also entered…”
    +1 more passage from the same document
    • “…closing conditions) and is expected to occur substantially concurrently with the Closing of the Merger and prior to the Effective…”
  • 2026-06-23merger or acquisition eventrecentOpen filing ↗
    “…registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards…”
    +1 more passage from the same document
    • “…of this chapter). Emerging growth company ☒ If an emerging growth company, indicate by check mark if the registrant has…”
  • 2026-06-23reverse splitrecentOpen filing ↗
    “…a proxy statement and prospectus, to register the shares issued pursuant to the Merger Agreement (the Form S-4) and will seek the…”
  • 2026-05-08share offering or dilution eventrecentOpen filing ↗
    “…which resulted in net proceeds to us of approximately $87.7 million, after deducting underwriting discounts and commissions and…”
  • 2026-05-08listing compliance noticerecentOpen filing ↗
    “…business, or prevent us from accessing critical information, potentially exposing us to liability or otherwise adversely affecting…”

Original excerpts from SEC filings, untranslated. Not advice and not a prediction.

SEC record

SEC dossier

What this company has filed with the SEC, in plain language.

The 25 most recent filings (of 138)

Everything filed

Every SEC filing, newest first, with what it is. Below, each type with its own explanation.

  • Oct 8, 26S-4 ↗Merger, acquisition or tender offer
  • Aug 28, 26Form 425 ↗Merger, acquisition or tender offer
  • Aug 28, 268-K ↗Current report · Entered a material agreement
  • Aug 28, 26Form 4 ↗Insider transaction
  • Aug 27, 26SCHEDULE 13G ↗Passive stake · Zachary Hornby · 9.8% · event on Oct 14, 25
  • Aug 14, 26SCHEDULE 13G ↗Passive stake · ADAR1 Capital Management, LLC · 8.8% · event on Jun 30, 26
  • Aug 14, 26SCHEDULE 13G/A ↗Passive stake · Citadel Securities Group LP · 0.6% · event on Jun 30, 26 · amendment
  • Aug 7, 2610-Q ↗Quarterly report
  • Insider transaction · 7 Form 4 filingsshow all 7hide
  • Jun 29, 26SCHEDULE 13G ↗Passive stake · TANG CAPITAL MANAGEMENT, LLC · 11.3% · event on Jun 23, 26
  • Jun 29, 26Form 4 ↗Insider transaction
  • Jun 29, 26Form 3 ↗Insider transaction
  • Jun 23, 26Form 425 ↗Merger, acquisition or tender offer
  • Jun 23, 268-K ↗Current report · Restructuring plan with committed costs
  • Jun 17, 268-K ↗Current report · Shareholder vote results
  • Insider transaction · 4 Form 4 filingsshow all 4hide

138 filings on record, the oldest from Sep 29, 23.

Listing the 25 most recent filings of the 138 on record.

8-Ks, explained

Stress2Structure6Governance6
  • Aug 28, 26StructureEntered a material agreement+1 more in the same filing8-K 1.01 ↗
  • Jun 23, 26StressRestructuring plan with committed costs+7 more in the same filing8-K 2.05 ↗
  • Apr 13, 26StructureA material agreement was terminated+1 more in the same filing8-K 1.02 ↗
  • Mar 9, 26GovernanceA senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
  • May 23, 25StressRestructuring plan with committed costs+1 more in the same filing8-K 2.05 ↗
  • Apr 1, 25StructureEntered a material agreement+1 more in the same filing8-K 1.01 ↗
  • Governance3 senior executive changes2024show all 3hide
    • Dec 12, 24GovernanceA senior executive left or was appointed+3 more in the same filing8-K 5.02 ↗
    • Oct 15, 24GovernanceA senior executive left or was appointed8-K 5.02 ↗
    • Aug 20, 24GovernanceA senior executive left or was appointed8-K 5.02 ↗

Corporate events are tracked from 2004-08-23, when the SEC renumbered 8-K items. Earlier filings use an incompatible numbering and are not classified here.

Ownership and control

Schedule 13G: short-form filing

The short form, for holders who meet specific requirements: institutional investors, passive investors without a control purpose, or exempt investors. Asset managers and index funds usually file it.

  • FMR LLC12.0%Dec 31, 25SCHEDULE 13G/A ↗2 co-filers on this document — the figure is the largest single stake, not their sum.
  • TANG CAPITAL MANAGEMENT, LLC11.3%Jun 23, 26SCHEDULE 13G ↗6 co-filers on this document — the figure is the largest single stake, not their sum.
  • Zachary Hornby9.8%Oct 14, 25SCHEDULE 13G ↗
  • ADAR1 Capital Management, LLC8.8%Jun 30, 26SCHEDULE 13G ↗2 co-filers on this document — the figure is the largest single stake, not their sum.
  • Kenneth Griffin6.4%Nov 26, 25SCHEDULE 13G ↗7 co-filers on this document — the figure is the largest single stake, not their sum.
show one more holderhide
  • Citadel Securities Group LP0.6%Jun 30, 26SCHEDULE 13G/A ↗7 co-filers on this document — the figure is the largest single stake, not their sum.

Structured 13D/G data starts 2023-12, when the SEC moved these filings to a machine-readable format. Earlier filings exist but are not parsed here.

SEC record

Insider transactions

Buys and sells reported by officers, directors and major shareholders on SEC Form 4.

Buys and sells

  • Aug 26, 26Sell$54KKEVIN TANG↗
  • Jul 21, 26Buy$7KKEVIN TANG↗
  • Jul 20, 26Buy$4KKEVIN TANG↗
  • Jul 17, 26Buy$647KEVIN TANG↗
  • Jul 16, 26Buy$45KKEVIN TANG↗
  • Jul 15, 26Buy$4KKEVIN TANG↗
  • Jul 14, 26Buy$107KKEVIN TANG↗
  • Jul 13, 26Buy$117KKEVIN TANG↗
  • Jul 10, 26Buy$105KKEVIN TANG↗
  • Jul 9, 26Buy$17KEVIN TANG↗
  • Jul 8, 26Buy$35KKEVIN TANG↗
  • Jul 7, 26Buy$39KKEVIN TANG↗

There are 17 more transactions in this stretch.

Stock compensation, tax and giftsshow the 11 other transactionshide

Stock compensation, tax withholding, option exercises and gifts. They are listed separately and are not included in the purchase and sale totals. The type describes the transaction, not the filer's intent.

  • Jul 1, 26Compensation$16KKEITH CRANDELL↗
  • Apr 2, 24Otheramount n/aKEITH CRANDELL↗
  • Apr 2, 24Otheramount n/aKEITH CRANDELL↗
  • Apr 2, 24Otheramount n/aKEITH CRANDELL↗
  • Apr 2, 24Otheramount n/aWellington Biomedical Innovation Master Investors (Cayman) I L.P.↗
  • Apr 2, 24Otheramount n/aWellington Biomedical Innovation Master Investors (Cayman) I L.P.↗
  • Apr 2, 24Otheramount n/aJonathan E Lim↗
  • Apr 2, 24Otheramount n/aKristina Burow↗
  • Apr 2, 24Otheramount n/aKristina Burow↗
  • Apr 2, 24Otheramount n/aKristina Burow↗
  • Apr 2, 24Otheramount n/aRA CAPITAL MANAGEMENT, L.P.↗

The full record holds 42 transactions and goes back to Mar 27, 24.

Its sector and its market

Boundless Bio, Inc. among Health Care companies

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Coverage

What sits behind this page.

Where each figure comes from and how far it reaches.

Prices
End-of-day closes provided by Twelve Data. One close per session; not real time. Closes adjusted for splits.
Series quality
Series with incidents in the period; the chart shows what could be kept.
SEC records
138 documents on file, from Sep 29, 2023 to Oct 8, 2026.
Company description
No description available.
This page
Generated on Oct 19, 2026; refreshed through the day.

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Which SEC documents appear here?

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