SEC Form 4 Reporting Owner · CIK 0001602227
Zachary Hornby
CEO at Boundless Bio Inc
Bought (12 mo)
—
Sold (12 mo)
—
Form 4 Filings
4
Companies
1
Filing Activity
2026-01-26
first filed 2024-03-29
Trading record
Open-market buys
—
0 filings
Open-market sales
—
0 filings
Sales under a 10b5-1 plan
—
No open-market sales
Companies
| Company | Role | Filings | Bought | Sold | Net | Holding after latest filing |
|---|---|---|---|---|---|---|
| BOLDBoundless Bio Insider trading | CEO | 4 | — | — | — | — |
Common-stock shares bought and sold on the open market, as reported on Form 4. The holding is what the latest filing at each company reported owning after its transactions.
Also files as
13D/G Beneficial owner of 5% or more · 1 open stake
| Company | Schedule | % of class | Filed |
|---|---|---|---|
| Boundless Bio | 13G | 9.8% | 2026-08-28 |