Boundless Bio Inc.
Last updated September 27, 2026
Organization details
- Legal name
- Boundless Bio Inc.
- Ownership
- Public
- Status
- Active
- SIC code
- 2834 — Pharmaceutical Preparations
- Jurisdiction of incorporation
- Delaware
- Headquarters city
- La Jolla
- Headquarters state / province
- California
- Headquarters country
- United States
- Fiscal year end
- December
- Ticker symbol
- BOLD
- Primary stock exchange
- Nasdaq
Identifiers
- SEC CIK
- 0001782303
- EIN
- 83-0751369
Board of directors
-
Christine Brennan · DirectorSince 2024
-
James Christensen · DirectorSince 2024
-
Jennifer Lew · DirectorSince 2024
-
Jonathan E. Lim · DirectorSince 2024
- Since 2024
-
Nancy Whiting · DirectorSince 2024
-
Zachary Hornby · Director · President & CEOSince 2024
Chief executives
Zachary Hornby
· President & CEO
Since March 2024
Director election results
Annual meeting of June 15, 2026. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
94.6%
-
94.8%
Board connections
3 of this board's directors also sit on 8 other boards.
- via Kristina Burow
- via Nancy Whiting
- via Jonathan E. Lim
- via Kristina Burow
- via Kristina Burow
- via Jonathan E. Lim
- via Kristina Burow
- via Kristina Burow
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
- Bought, last 12 months
- $1,515,094
- 22 purchases by 1 insider
- Sold, last 12 months
- $134,031
- 3 sales by 3 insiders
| Date | Insider | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Aug 26, 2026 | Kevin Tang 10% owner | Open-market sale | −18,300 | $2.97 | $54,351 |
| Jul 21, 2026 | Kevin Tang 10% owner | Open-market purchase | +2,975 | $2.44 | $7,259 |
| Jul 20, 2026 | Kevin Tang 10% owner | Open-market purchase | +1,623 | $2.44 | $3,960 |
| Jul 17, 2026 | Kevin Tang 10% owner | Open-market purchase | +265 | $2.44 | $647 |
| Jul 16, 2026 | Kevin Tang 10% owner | Open-market purchase | +18,491 | $2.44 | $45,118 |
| Jul 15, 2026 | Kevin Tang 10% owner | Open-market purchase | +1,600 | $2.44 | $3,904 |
| Jul 14, 2026 | Kevin Tang 10% owner | Open-market purchase | +43,878 | $2.43 | $106,624 |
| Jul 13, 2026 | Kevin Tang 10% owner | Open-market purchase | +48,211 | $2.42 | $116,671 |
| Jul 10, 2026 | Kevin Tang 10% owner | Open-market purchase | +43,367 | $2.43 | $105,382 |
| Jul 9, 2026 | Kevin Tang 10% owner | Open-market purchase | +7 | $2.48 | $17 |
| Jul 8, 2026 | Kevin Tang 10% owner | Open-market purchase | +14,338 | $2.46 | $35,271 |
| Jul 7, 2026 | Kevin Tang 10% owner | Open-market purchase | +15,810 | $2.48 | $39,209 |
| Jul 6, 2026 | Kevin Tang 10% owner | Open-market purchase | +27,062 | $2.49 | $67,384 |
| Jul 2, 2026 | Kevin Tang 10% owner | Open-market purchase | +9,821 | $2.49 | $24,454 |
| Jul 1, 2026 | ARCH Venture Fund IX, L.P. 10% owner | Option exercise | +16,000 | $1.03 | $16,480 |
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