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CIK 0002070849 · Non-accelerated filer<br>Emerging growth company

BillionToOne, Inc.

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Ticker
BLLN
Exchange
Nasdaq
Industry
Services-Medical Laboratories
FY end
Dec 31
Incorporated
DE
Entity type
operating
EIN
811082020
Phone
650-460-2551
Business address
1035 O'BRIEN DRIVE, MENLO PARK, CA
Open-market buys, last 90 days
$0
in 0 filings
Open-market sales, last 90 days
$26,737,121
in 19 filings, $26.7M under 10b5-1 plans

Net −$26,737,121. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.

Pace of trading Bought Sold

Who's trading

90 days

  1. Atay Oguzhan −$11.9M Chairman and CEO sold 44% of stake
  2. Tsao David −$7.7M Chief Technology Officer sold 99% of stake
  3. Lynch Thomas P. −$5.9M See Remarks sold 99% of stake
  4. ten Bosch John Roderick −$1.2M SVP of Laboratory Operations sold 41% of stake
Date Insider Transaction Shares Price Value Owned after
2026-09-08 Lynch Thomas P. See Remarks Sale 10b5-1 −232 $100.92 $23K 700
2026-09-08 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −11,042 $8.65 $96K 68,358
2026-09-08 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −3,969 $11.55 $46K 11,031
2026-09-08 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −1,663 $17.12 $28K 8,337
2026-09-08 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −3,326 $30.78 $102K 36,674
2026-09-08 Atay Oguzhan Chairman and CEO Conversion +20,000 20,000
2026-09-08 Atay Oguzhan Chairman and CEO Conversion · Class B Common Stock −20,000 2,197,542
2026-09-08 Tsao David Chief Technology Officer Gift −20,000 1,000
2026-09-03 Tsao David Chief Technology Officer Conversion +20,000 21,000
2026-09-03 Tsao David Chief Technology Officer Conversion · Class B Common Stock −20,000 2,305,108
2026-08-26 KOLLURI KRISHNA KITTU Director Other disposition −129,780 908,459
2026-08-26 KOLLURI KRISHNA KITTU Director Other acquisition +7,980 7,980
2026-08-26 KOLLURI KRISHNA KITTU Director Other disposition −7,980 0
2026-08-26 KOLLURI KRISHNA KITTU Director Other disposition −24,222 169,550
2026-08-26 KOLLURI KRISHNA KITTU Director Other acquisition +2,405 2,405
2026-08-26 KOLLURI KRISHNA KITTU Director Other disposition −2,405 0
2026-08-26 KOLLURI KRISHNA KITTU Director Other disposition −271,028 1,897,202
2026-08-26 KOLLURI KRISHNA KITTU Director Other acquisition +38,106 38,106
2026-08-26 KOLLURI KRISHNA KITTU Director Other disposition −38,106 0
2026-08-26 KOLLURI KRISHNA KITTU Director Other disposition −10,921 76,441

Page 9 of 32 · 639 trades