BillionToOne (BLLN) CPO Sakakibara Sells 4,000 Shares

What Happened

• Sakakibara Shan Riku, Chief Product Officer of BillionToOne (BLLN), sold 4,000 shares in an open‑market transaction on July 31, 2026. The shares were disposed at $140.21 each, for a total transaction value of $560,840. This was a sale (not a purchase or option exercise).

Key Details

• Transaction date and price: July 31, 2026 — 4,000 shares at $140.21 per share.
• Total value: $560,840.
• Shares owned after transaction: not specified in the summary provided (see the Form 4 for holdings after the sale).
• Plan/footnote: The sale was executed pursuant to a Rule 10b5‑1 trading plan adopted by the reporting person on March 6, 2026 (Footnote F1).
• Filing timeliness: The Form 4 was filed August 4, 2026 for a July 31 transaction, later than the typical 2‑business‑day Form 4 reporting window.

Context

• Sales under 10b5‑1 plans are pre‑arranged trades that can be scheduled to avoid potential trading-window issues; they are common and do not by themselves indicate the insider’s current view of the company.