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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
2026-10-13 Lynch Thomas P. See Remarks Option exercise +2,000 $8.65 $17K 10,700
2026-10-13 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) −2,000 $8.65 $17K 38,974
2026-10-08 Lynch Thomas P. See Remarks Option exercise +8,000 $8.65 $69K 8,700
2026-10-08 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) −8,000 $8.65 $69K 40,974
2026-09-17 Lynch Thomas P. See Remarks Option exercise 10b5-1 +19,384 $8.65 $168K 20,084
2026-09-17 Lynch Thomas P. See Remarks Option exercise 10b5-1 +6,968 $11.55 $80K 27,052
2026-09-17 Lynch Thomas P. See Remarks Option exercise 10b5-1 +2,920 $17.12 $50K 29,972
2026-09-17 Lynch Thomas P. See Remarks Option exercise 10b5-1 +5,840 $30.78 $180K 35,812
2026-09-17 Lynch Thomas P. See Remarks Sale 10b5-1 −19,384 $110.36 $2.1M 16,428
2026-09-17 Lynch Thomas P. See Remarks Sale 10b5-1 −6,968 $110.30 $769K 9,460
2026-09-17 Lynch Thomas P. See Remarks Sale 10b5-1 −2,920 $110.31 $322K 6,540
2026-09-17 Lynch Thomas P. See Remarks Sale 10b5-1 −5,840 $110.29 $644K 700
2026-09-17 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −19,384 $8.65 $168K 48,974
2026-09-17 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −6,968 $11.55 $80K 4,063
2026-09-17 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −2,920 $17.12 $50K 5,417
2026-09-17 Lynch Thomas P. See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −5,840 $30.78 $180K 30,834
2026-09-08 Lynch Thomas P. See Remarks Option exercise 10b5-1 +11,042 $8.65 $96K 11,742
2026-09-08 Lynch Thomas P. See Remarks Option exercise 10b5-1 +3,969 $11.55 $46K 15,711
2026-09-08 Lynch Thomas P. See Remarks Option exercise 10b5-1 +1,663 $17.12 $28K 17,374
2026-09-08 Lynch Thomas P. See Remarks Option exercise 10b5-1 +3,326 $30.78 $102K 20,700

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