Boundless Bio insider buys 107,463 shares
Boundless Bio, Inc. insider entities affiliated with Kevin Tang reported open-market purchases of a total of 107,463 shares of Common Stock at prices around $2.49–$2.60 per share over three days.
Rhea-AI Filing Summary
Boundless Bio, Inc. insider entities affiliated with Kevin Tang reported open-market purchases of a total of 107,463 shares of Common Stock at prices around $2.49–$2.60 per share over three days. The transactions were made indirectly through limited partnerships managed by Tang Capital Management, LLC.
Following these purchases, the reporting entities collectively beneficially own 2,641,308 shares of Boundless Bio Common Stock, as described in the filing’s ownership breakdown for Tang Capital Partners, LP and related entities. All reported trades were classified as open-market purchases, with no sales or derivative transactions disclosed.
Positive
- None.
Negative
- None.
Insider Trade Summary
Net Buyer: 107,463 shares
Net Buy
4 txns
Insider
TANG KEVIN, TANG CAPITAL MANAGEMENT LLC
Role
10% Owner | 10% Owner
Bought
107,463 shs ($269K)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Purchase | Common Stock | 9,821 | $2.49 | $24K |
| Purchase | Common Stock | 71,612 | $2.49 | $178K |
| Purchase | Common Stock | 25,930 | $2.54 | $66K |
| Purchase | Common Stock | 100 | $2.50 | $250.00 |
Holdings After Transaction:
Common Stock — 2,641,308 shares (Indirect, By LP)
Footnotes (5)
- F1. The prices reported are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $2.49 to $2.60. 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 5.
- F2. Tang Capital Partners, LP ("TCP") beneficially owns 605,296 shares, Tang Capital Partners International, LP ("TCPI") beneficially owns 825,422 shares, Tang Capital Partners III, Inc. ("TCP III") beneficially owns 605,294 shares, and Tang Capital Partners IV, Inc. ("TCP IV") beneficially owns 605,296 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.
- F3. These shares were all purchased at $2.50.
- F4. These shares were purchased in multiple transactions at prices ranging from $2.46 to $2.50.
- F5. These shares were purchased in multiple transactions at prices ranging from $2.47 to $2.50.
Key Figures
Total shares purchased: 107,463 shares
Price range: $2.49–$2.60 per share
Post-transaction holdings: 2,641,308 shares
+3 more
6 metrics
Total shares purchased
107,463 shares
Net open-market purchases reported in this Form 4
Price range
$2.49–$2.60 per share
Reported ranges for Boundless Bio Common Stock purchases
Post-transaction holdings
2,641,308 shares
Beneficial ownership across Tang Capital-related entities after trades
July 2 purchase size
9,821 shares
Open-market purchase on July 2, 2026 at $2.49 per share
July 1 purchase size
71,612 shares
Open-market purchase on July 1, 2026 at $2.49 per share
June 30 larger purchase
25,930 shares
Open-market purchase on June 30, 2026 at $2.54 per share
Key Terms
open-market purchase, beneficially owns, pecuniary interest, limited partnerships
4 terms
open-market purchase financial
"All reported trades were classified as open-market purchases, with no sales or derivative transactions disclosed."
An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.
beneficially owns financial
"Tang Capital Partners, LP ("TCP") beneficially owns 605,296 shares, Tang Capital Partners International, LP ("TCPI") beneficially owns 825,422 shares..."
Beneficially owns means a person or entity enjoys the economic benefits and control of a security even if the legal title or registration is held in another name. Think of it like having the keys and profits from a car that is registered to a friend: you use it, benefit from it, and make decisions about it even though the official paperwork lists someone else. For investors, this matters because it reveals who truly controls shares, affects voting power, potential conflicts of interest, and regulatory disclosure obligations.
pecuniary interest financial
"Mr. Tang has a pecuniary interest in the shares beneficially held by TCP, TCPI, TCP III and TCP IV."
limited partnerships financial
"These purchases occurred indirectly through limited partnerships managed by Tang Capital Management, LLC."
A limited partnership is a business structure with two types of partners: one or more general partners who run the business and carry full legal responsibility for its debts, and one or more limited partners who contribute money but do not take part in daily management and whose legal responsibility is capped at the amount they invested. For investors, this setup matters because it separates control from financial risk—like founders steering a boat while passive backers fund the trip—and determines who makes decisions, how profits and losses flow to owners for taxes, and how easily an investor can sell their stake.
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