John Roderick ten Bosch, an officer of BillionToOne, Inc., filed a Form 144 notice on November 2, 2026, disclosing a proposed sale of 2,834 Class A shares on NASDAQ under Rule 144 of the Securities Act of 1933.

Key Highlights

  • Proposed sale: 2,834 Class A shares of BillionToOne, Inc. (NASDAQ:BLLN) with an aggregate market value of $320,723.78.
  • Approximate sale date: November 2, 2026, through Fidelity Brokerage Services LLC.
  • Shares outstanding: 42,644,388 Class A shares outstanding at the time of filing, according to the notice.
  • Original acquisition: The 2,834 shares were acquired on January 13, 2022, as pre-IPO shares from the issuer, with cash payment on the same date.
  • 10b5-1 plan: The filing indicates a Rule 10b5-1 plan adoption date of June 2, 2026.
  • Recent prior sales: Six sales of Class A shares were reported in the prior three months, totaling 9,916 shares with combined gross proceeds of $1,030,274.12.

BillionToOne Officer Files Rule 144 Notice for Class A Share Sale

According to the Form 144 notice filed with the U.S. Securities and Exchange Commission, John Roderick ten Bosch, identified as an officer of BillionToOne, Inc., proposed to sell 2,834 Class A shares at an aggregate market value of $320,723.78. The filing lists Fidelity Brokerage Services LLC, located at 900 Salem Street, Smithfield, RI 02917, as the named broker for the transaction. BillionToOne, Inc. is headquartered at 1035 O'Brien Drive, Menlo Park, California 94025, and the filing carries SEC File Number 001-42934.

The filing discloses that the shares proposed for sale were originally acquired on January 13, 2022, as pre-IPO shares directly from the issuer, with payment made in cash on that same date. The notice also states that ten Bosch adopted a written trading plan under Rule 10b5-1 on June 2, 2026, and the filing was signed by Jennifer Ruchti as a duly authorized representative of Fidelity Brokerage Services LLC, acting as attorney-in-fact for John R. Ten Bosch.

In the section covering securities sold during the past three months, the filing lists six prior transactions by John R. Ten Bosch: sales of 1,417 shares on August 10, 2026 (gross proceeds $131,582.62); 1,417 shares on August 25, 2026 ($141,700.00); 1,416 shares on September 9, 2026 ($138,116.64); 1,416 shares on September 21, 2026 ($150,959.76); 1,416 shares on September 24, 2026 ($169,920.00); and 2,834 shares on October 5, 2026 ($297,995.10). The filing identifies all six transactions as Class A shares sold at the same address listed for the issuer.

What Was Disclosed

BillionToOne officer John Roderick ten Bosch filed a Form 144 notice proposing to sell 2,834 Class A shares valued at $320,723.78 on NASDAQ, with Fidelity Brokerage Services LLC as broker, under a Rule 10b5-1 plan adopted June 2, 2026.