BillionToOne chairman and CEO Atay sells $1.3 million in shares

Oguzhan Atay, Chairman and CEO of BillionToOne, Inc. (NASDAQ:BLLN), sold 10,999 shares of the company's Class A Common Stock, amassing roughly $1.33 million. These transactions, which took place on September 28, 2026, encompassed both direct holdings and shares indirectly owned by his spouse. Prior to one sale, Mr. Atay exercised options to purchase 8,333 shares.

The insider sale followed BLLN shares' 28% increase over the past six months, though the stock trades at $106.44, which InvestingPro's data suggests is above its Fair Value. Mr. Atay exercised options to buy 8,333 shares at $2.80 each, totaling $23,332. These shares were then sold at $120.64 per share, yielding approximately $1,005,293.

The trade was executed under a Rule 10b5-1 trading plan he established on June 5, 2026. Additionally, 2,666 shares indirectly owned by his spouse were sold at $120.64 per share, amounting to $321,626. This sale was also under a Rule 10b5-1 plan adopted by the spouse on June 7, 2026. Post these transactions, Mr. Atay's spouse retains 154,502 shares of BillionToOne Class A Common Stock.

Investors can find more on BLLN's valuation and performance in the InvestingPro Pro Research Report. Meanwhile, BillionToOne reported Q2 earnings that surpassed expectations, with earnings per share at $0.15, significantly above the $0.03 analyst forecast. Revenue for the quarter grew 64% year-over-year, totaling $109.4 million.

Despite the strong results, the company's stock plunged in after-hours trading, with investors worried about future growth prospects. Canaccord Genuity initiated coverage on BillionToOne with a buy rating, targeting $120.00. They praised the company's smNGS and QCT technologies as key differentiators in their diagnostics portfolio.