Who's buying Boundless Bio, Inc.?

BOLD insider buying, 13F and 13D filings

• Oct 26, 2026Form 4 · 10% owner
  TANG KEVIN (+1 joint): Bought $401K on the open market in 2 filings
  2 purchases filed 2026-10-20 to 2026-10-26. Latest: 21.6K shares at ~$2.39, traded 2026-10-22 to 2026-10-26. Now holds 3.01M shares (stake up 1%).
  View the filing on SEC EDGAR ↗

Signals come from SEC filings: Form 4 (insiders, filed within 2 business days), 13F (fund holdings, up to 45 days after quarter end) and Schedule 13D (5%+ activist stakes). This page reports what the filings show; it is not investment advice.