A Form 4 filed with the SEC on September 11, 2026, discloses that John Roderick ten Bosch, SVP of Laboratory Operations at BillionToOne, Inc. (NASDAQ:BLLN), sold 1,416 shares of Class A Common Stock on September 9, 2026, under a pre-established Rule 10b5-1 trading plan.

Key Highlights

  • Shares sold: 1,416 shares of Class A Common Stock disposed of on September 9, 2026
  • Sale price: $97.54 per share
  • Remaining ownership: 25,051 shares of Class A Common Stock held directly following the transaction
  • Trading plan: The sale was made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 2, 2026
  • Reporting person: John Roderick ten Bosch, SVP of Laboratory Operations at BillionToOne, Inc.

BillionToOne SVP Transaction Details and Plan Background

According to the filing, John Roderick ten Bosch, identified as SVP of Laboratory Operations at BillionToOne, Inc., disposed of 1,416 shares of Class A Common Stock at a price of $97.54 per share on September 9, 2026. The transaction is coded "S," indicating a sale, and the shares are reported as directly owned. No derivative securities transactions were reported in Table II of the form.

The filing notes that the transaction was "effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 2, 2026." The form also indicates the box was checked confirming the transaction was made pursuant to a contract, instruction, or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). Following the reported sale, ten Bosch beneficially owned 25,051 shares of Class A Common Stock directly.

The Form 4 was signed by Thomas P. Lynch as Attorney-in-Fact and dated September 11, 2026. The filing covers BillionToOne, Inc., listed on NASDAQ under the ticker BLLN, with the reporting person's address listed as c/o BillionToOne, Inc., 1035 O'Brien Drive, Menlo Park, California 94025.

What Was Disclosed

The filing discloses that BillionToOne SVP John Roderick ten Bosch sold 1,416 shares of Class A Common Stock at $97.54 per share on September 9, 2026, under a Rule 10b5-1 plan adopted June 2, 2026, retaining direct ownership of 25,051 shares.