Boundless Bio (BOLD) 10% Owner Kevin Tang Sells Shares

What Happened
Kevin Tang, a 10% owner of Boundless Bio (BOLD), sold 18,300 shares in open-market transactions on August 26, 2026. The weighted-average sale price was $2.97, with individual trades ranging from $2.90 to $3.03, producing gross proceeds of $54,351. The reporting persons delivered $10,046.70 to the issuer as the full amount of the disgorgeable profit (Footnote 1).

Key Details

• Transaction type: Open-market sale (Code S) on 2026-08-26.
• Price/amount: Weighted-average price $2.97; price range $2.90–$3.03 (Footnote 2). Gross proceeds ≈ $54,351.
• Disgorgement: $10,046.70 paid to the issuer (Footnote 1).
• Shares owned after transaction: Reporting persons beneficially own 2,840,635 shares through affiliated entities (TCP 655,170; TCPI 887,715; TCP III 655,161; TCP IV 642,589) (Footnote 3).
• Filing: Report filed 2026-08-28 for the 2026-08-26 transaction (timely filing).
• Additional note: Footnote 2 states the reported price is a weighted average and the reporting persons can provide the exact breakdown of trades upon request.

Context
Kevin Tang’s interest is held through investment entities for which he is manager/director and is reported as a 10% owner — this is major-shareholder/affiliate activity rather than an ordinary employee trade. The Form 4 is factual about the sale and the disgorgement payment; it does not state motivations.