List of insiders holdings for Boundless Bio Inc.:
- Shares directly owned by the insider.
- Shares indirectly owned by the insider.
- Total shares owned by the insider (sum of shares directly and indirectly owned).
- Total market value if available.
- Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
What is insider trading>>
- Peter Lynch
What is insider trading>>
| # | Insider Holder Name | Report Date Time | Shares Owned Directly Indirectly | Total Shares Owned | Filing |
| 1 | TANG KEVIN TANG CAPITAL MANAGEMENT LLC 10% Owner | 2026-08-28 16:16:09 | 0 2,840,635 | 2,840,635 | Form 4 |
| 2 | CRANDELL KEITH BYBEE CLINTON NELSEN ROBERT GILLIS STEVEN Burow Kristina 10% Owner | 2026-07-06 17:44:44 | 0 2,694,095 | 2,694,095 | Form 4 |
| 3 | ARCH Venture Fund IX L.P. ARCH Venture Fund IX Overage L.P. ARCH Venture Fund X Overage L.P. ARCH Venture Partners IX L.P. ARCH Venture Partners IX Overage L.P. ARCH Venture Partners X Overage L.P. ARCH Venture Partners IX LLC ARCH Venture Partners X LLC 10% Owner | 2026-07-06 17:43:19 | 0 2,694,095 | 2,694,095 | Form 4 |
| 4 | Hornby Zachary President & CEO | 2026-08-27 21:05:07 | 2,426,857 0 | 2,426,857 | Form 13G |
| 5 | Wellington Biomedical Innovation Master Investors (Cayman) I L.P. 10% Owner | 2024-04-02 20:42:06 | 556,233 0 | 556,233 | Form 4 |
| 6 | Wagner Klaus W. Chief Medical Officer | 2024-08-20 19:06:01 | 316,895 0 | 316,895 | Form 4 |
| 7 | Rubin Jami Chief Financial Officer | 2024-08-20 19:03:38 | 280,554 0 | 280,554 | Form 4 |
| 8 | Hassig Christian Chief Scientific Officer | 2026-01-26 07:00:07 | 230,000 0 | 230,000 | Form 4 |
| 9 | Doebele Robert Chief Medical Officer | 2026-01-26 07:00:06 | 230,000 0 | 230,000 | Form 4 |
| 10 | Oien Jessica See Remarks | 2026-01-26 07:00:09 | 220,000 0 | 220,000 | Form 4 |
| 11 | Abdollahian Neil Chief Business Officer | 2024-08-20 19:08:58 | 216,913 0 | 216,913 | Form 4 |
| 12 | HINKLE DAVID A See Remarks | 2026-01-26 07:00:03 | 140,000 0 | 140,000 | Form 4 |
| 13 | Lim Jonathan E Director | 2026-06-15 19:36:07 | 48,000 0 | 48,000 | Form 4 |
| 14 | Lew Jennifer Director | 2026-06-15 19:28:54 | 32,000 0 | 32,000 | Form 4 |
| 15 | Christensen James Director | 2026-06-15 19:31:40 | 32,000 0 | 32,000 | Form 4 |
| 16 | Whiting Nancy Director | 2026-06-15 19:40:59 | 32,000 0 | 32,000 | Form 4 |
| 17 | Brennan Christine Director | 2025-06-23 17:21:20 | 16,000 0 | 16,000 | Form 4 |
| 18 | RA CAPITAL MANAGEMENT L.P. RA Capital Healthcare Fund LP RA Capital Nexus Fund II L.P. Kolchinsky Peter Shah Rajeev M. 10% Owner | 2025-08-14 17:57:29 | 0 0 | 0 | Form 13G |