Kevin Tang - 06 Jul 2026 Form 4 Insider Report for Boundless Bio, Inc. (BOLD)

Reporting relationship: 10%+ Owner
Issuer ticker: BOLD
Reported as of: 06 Jul 2026
Net transaction value: +$141,865
SEC form: 4
Accepted by SEC: 08 Jul 2026, 20:06:07 UTC
Prior SEC filing: 02 Jul 2026
Next SEC filing: 13 Jul 2026
Source filing: View source filing
Reporting owner signature: Kevin Tang

Key filing fact

Kevin Tang filed Form 4 for Boundless Bio, Inc. (BOLD) on 08 Jul 2026.

Key facts

This page summarizes Kevin Tang's Form 4 filing for Boundless Bio, Inc. (BOLD).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 08 Jul 2026, 20:06.

Change

Previous filing in this sequence was filed on 02 Jul 2026.
Current net transaction value: +$141,865.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (2)

CIK 0001178579 Primary reporting owner

TANG KEVIN

Relationship: 10%+ Owner
Address: 4747 EXECUTIVE DRIVE, SUITE 210, SAN DIEGO
Signature: Kevin Tang
Signature date: 08 Jul 2026

CIK 0001232621

TANG CAPITAL MANAGEMENT LLC

Relationship: 10%+ Owner
Address: 4747 EXECUTIVE DRIVE, SUITE 210, SAN DIEGO
Signature: Kevin Tang, Manager
Signature date: 08 Jul 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

BOLD transaction

Common Stock

Purchase

Transaction value: $67,384
Shares: +27,062
Change %: +1%
Price: $2.49
Shares after: 2,668,370
Date: 06 Jul 2026
Ownership: By LP
Footnotes: F1, F2

BOLD transaction

Common Stock

Purchase

Transaction value: $67,384
Shares: +27,062
Change %: +1%
Price: $2.49
Shares after: 2,668,370
Date: 06 Jul 2026
Ownership: By LP
Footnotes: F1, F2

BOLD transaction

Common Stock

Purchase

Transaction value: $39,209
Shares: +15,810
Change %: +0.59%
Price: $2.48
Shares after: 2,684,180
Date: 07 Jul 2026
Ownership: By LP
Footnotes: F2, F3

BOLD transaction

Common Stock

Purchase

Transaction value: $39,209
Shares: +15,810
Change %: +0.59%
Price: $2.48
Shares after: 2,684,180
Date: 07 Jul 2026
Ownership: By LP
Footnotes: F2, F3

BOLD transaction

Common Stock

Purchase

Transaction value: $35,271
Shares: +14,338
Change %: +0.53%
Price: $2.46
Shares after: 2,698,518
Date: 08 Jul 2026
Ownership: By LP
Footnotes: F2, F4

BOLD transaction

Common Stock

Purchase

Transaction value: $35,271
Shares: +14,338
Change %: +0.53%
Price: $2.46
Shares after: 2,698,518
Date: 08 Jul 2026
Ownership: By LP
Footnotes: F2, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

The prices reported are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $2.46 to $2.50. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the SEC staff, upon request, all information regarding the number of shares purchased at each price within the ranges set forth in Footnotes 1 and 3 through 4.

Footnote F2

Tang Capital Partners, LP ("TCP") beneficially owns 618,407 shares, Tang Capital Partners International, LP ("TCPI") beneficially owns 843,301 shares, Tang Capital Partners III, Inc. ("TCP III") beneficially owns 618,403 shares, and Tang Capital Partners IV, Inc. ("TCP IV") beneficially owns 618,407 shares. Kevin Tang is the sole manager of Tang Capital Management, LLC, which is the general partner of TCP and TCPI. Kevin Tang is the sole director and Chief Executive Officer of TCP III and TCP IV, which are indirectly wholly owned by TCP. Mr. Tang has a pecuniary interest in the shares beneficially held by TCP, TCPI, TCP III and TCP IV.

Footnote F3

These shares were purchased in multiple transactions at prices ranging from $2.44 to $2.50.

Footnote F4

These shares were purchased in multiple transactions at prices ranging from $2.42 to $2.48.