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  4. [Form 3] Boundless Bio, Inc. Initial Statement of Beneficial Ownership

Tang Capital entities disclose 2.25M Boundless Bio (BOLD) shares in Form 3 filing

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Boundless Bio, Inc. insider filings show that entities affiliated with Tang Capital report initial beneficial ownership of the company’s common stock. The Form 3 indicates indirect holdings of 2,247,512 shares of common stock, held by limited partnership and corporate vehicles associated with Tang Capital.

Kevin Tang is described as the sole manager or director of these entities and has a pecuniary interest in the shares they beneficially own. The filing is an initial ownership report and does not show any new purchases or sales of Boundless Bio stock.

Positive

  • None.

Negative

  • None.
Insider TANG KEVIN, TANG CAPITAL MANAGEMENT LLC
Role null | null
Type Security Shares Price Value
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 2,247,512 shares (Indirect, By LP)
Footnotes (1)
  1. [object Object]
Indirectly owned shares 2,247,512 shares Common Stock beneficially owned through Tang Capital entities
ten percent owner financial
"is_ten_percent_owner": 1"
beneficially owned financial
"The shares are beneficially owned by Tang Capital Partners, LP"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
pecuniary interest financial
"Mr. Tang has a pecuniary interest in the shares beneficially held"
indirect financial
""ownership_type": "indirect""
Form 3 regulatory
"INSIDER FILING DATA (Form 3):"
Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.
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SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
TANG KEVIN
(Last)(First)(Middle)
4747 EXECUTIVE DRIVE
SUITE 210
(Street)
SAN DIEGO CALIFORNIA 92121
(City)(State)(Zip)
UNITED STATES
(Country)		2. Date of Event Requiring Statement (Month/Day/Year)
06/25/2026		3. Issuer Name and Ticker or Trading Symbol
Boundless Bio, Inc. [ BOLD ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock2,247,512IBy LP(1)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
1. Name and Address of Reporting Person*
TANG KEVIN
(Last)(First)(Middle)
4747 EXECUTIVE DRIVE
SUITE 210
(Street)
SAN DIEGO CALIFORNIA 92121
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
TANG CAPITAL MANAGEMENT LLC
(Last)(First)(Middle)
4747 EXECUTIVE DRIVE
SUITE 210
(Street)
SAN DIEGO CALIFORNIA 92121
(City)(State)(Zip)
UNITED STATES
(Country)
Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. The shares are beneficially owned by Tang Capital Partners, LP ("TCP"), Tang Capital Partners International, LP ("TCPI"), Tang Capital Partners III, Inc. ("TCP III") and Tang Capital Partners IV, Inc. ("TCP IV"). 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.
Kevin Tang06/29/2026
Kevin Tang, Manager06/29/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What does the Boundless Bio (BOLD) Form 3 filed by Tang Capital report?

The Form 3 reports initial beneficial ownership of Boundless Bio common stock by Tang Capital–related entities. It shows indirect holdings of 2,247,512 shares and identifies Kevin Tang’s roles in those entities and his pecuniary interest in the reported holdings.

How many Boundless Bio (BOLD) shares are reported as owned by Tang Capital entities?

The filing reports 2,247,512 shares of Boundless Bio common stock. These shares are indirectly owned through Tang Capital Partners, LP, Tang Capital Partners International, LP, Tang Capital Partners III, Inc., and Tang Capital Partners IV, Inc., as described in the ownership footnote.

Is Kevin Tang a ten percent owner of Boundless Bio (BOLD) according to this Form 3?

Yes. The Form 3 identifies Kevin Tang as a ten percent owner of Boundless Bio. His ownership arises through entities he manages or controls, including Tang Capital Management, LLC and several Tang Capital partnership and corporate vehicles that beneficially hold the reported shares.

Are the Boundless Bio (BOLD) shares held directly by Kevin Tang or through entities?

The shares are held indirectly through entities such as Tang Capital Partners, LP and related entities. The footnote explains that Kevin Tang controls these entities and has a pecuniary interest in their holdings, but the reported ownership is characterized as indirect by limited partnership.

Does the Boundless Bio (BOLD) Form 3 show any recent insider buying or selling?

No. The Form 3 functions as an initial statement of beneficial ownership rather than a trade report. It lists 2,247,512 shares of common stock held indirectly but does not disclose any purchase, sale, or other transaction changing that ownership position.