Boundless Bio, Inc. (BOLD)
Nasdaq: BOLD · Pharmaceutical Preparations · San Diego, CA · filing with the SEC since 2020
Who runs Boundless Bio, Inc.
Officers and directors as they report to the SEC on Forms 3, 4 and 5, named as filedChief executive, as filed
Hornby Zachary
President & CEO. First filing Mar 2024, latest Jan 26, 2026, 0 filings in all.
Officers reporting now
5
of 10 people with a filing in the last fifteen months
Directors reporting now
5
14 people on the record since 2024
Officerssales are open-market, Nov 10, 2025 to Nov 10, 2026
| Name | Title as filed | First filing | Latest filing | Sales, 12 months |
|---|---|---|---|---|
| Hornby Zachary | President & CEO | Mar 2024 | Jan 26, 2026 | none |
| Doebele Robert | Chief Medical Officer | Feb 2025 | Jan 26, 2026 | none |
| Hassig Christian | Chief Scientific Officer | Mar 2024 | Jan 26, 2026 | none |
| Oien Jessica | Chief Legal Officer and Corporate Secretary | Mar 2024 | Jan 26, 2026 | none |
| Hinkle David A | Senior VP, Finance, Controller and Treasurer | Oct 2024 | Jan 26, 2026 | none |
Directorssales are open-market, Nov 10, 2025 to Nov 10, 2026
| Name | Role | First filing | Latest filing | Sales, 12 months |
|---|---|---|---|---|
| Burow Kristina | director | Mar 2024 | Jul 6, 2026 | none |
| Christensen James | director | Mar 2024 | Jun 15, 2026 | none |
| Lew Jennifer | director | Mar 2024 | Jun 15, 2026 | none |
| Lim Jonathan E | director | Mar 2024 | Jun 15, 2026 | none |
| Whiting Nancy | director | Mar 2024 | Jun 15, 2026 | none |
Owners of more than 10% of a classsales are open-market, Nov 10, 2025 to Nov 10, 2026
| Name | Role | First filing | Latest filing | Sales, 12 months |
|---|---|---|---|---|
| Tang Capital Management LLC | 10% owner | Jun 2026 | Nov 10, 2026 | 1 · $100,000 |
| Tang Kevin | 10% owner | Jun 2026 | Nov 10, 2026 | none |
| Arch Venture Fund Ix Overage, L.P. | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Arch Venture Fund Ix, L.P. | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Arch Venture Fund X Overage, L.P. | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Arch Venture Partners Ix Overage, L.P. | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Arch Venture Partners Ix, L.P. | 10% owner | Mar 2024 | Jul 6, 2026 | 1 · $0.00 |
| Arch Venture Partners Ix, LLC | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Arch Venture Partners X Overage, L.P. | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Arch Venture Partners X, LLC | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Bybee Clinton | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Crandell Keith | 10% owner | Mar 2024 | Jul 6, 2026 | none |
| Gillis Steven | 10% owner | Mar 2024 | Jul 6, 2026 | 1 · $0.00 |
| Nelsen Robert | 10% owner | Mar 2024 | Jul 6, 2026 | none |
Earlier names on the record10, newest filing first
Brennan Christine · director · last filing Jun 2025Rubin Jami · officer · last filing Aug 2024Abdollahian Neil · officer · last filing Aug 2024Wagner Klaus W. · officer · last filing Aug 2024Kolchinsky Peter · 10% owner · last filing Apr 2024Ra Capital Healthcare Fund LP · 10% owner · last filing Apr 2024Ra Capital Management, L.P. · 10% owner · last filing Apr 2024Ra Capital Nexus Fund II, L.P. · 10% owner · last filing Apr 2024Shah Rajeev M. · 10% owner · last filing Apr 2024Wellington Biomedical Innovation Master Investors (Cayman) I L.P. · 10% owner · last filing Apr 2024
A person is listed as reporting now after a filing in the last fifteen months. The record shows when someone last filed; it does not say why they stopped. Each name links to the filings on sec.gov.