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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
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −79 $100.87 $8K 26,171
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −5,466 $94.76 $518K 20,705
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −1,856 $95.59 $177K 18,849
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −4,372 $96.89 $424K 14,477
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −4,066 $98.12 $399K 10,411
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −3,605 $99.06 $357K 6,806
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −556 $99.97 $56K 6,250
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −6,250 $100.00 $625K 0
2026-06-08 Atay Oguzhan See Remarks Conversion 10b5-1 +10,000 10,000
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −6,250 $96.45 $603K 193,750
2026-06-08 Atay Oguzhan See Remarks Sale 10b5-1 −6,250 $100.00 $625K 187,500
2026-06-08 Atay Oguzhan See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −20,000 $2.80 $56K 620,000
2026-06-08 Atay Oguzhan See Remarks Option exercise · Stock Option (right to buy) 10b5-1 −6,250 $2.80 $18K 613,750
2026-06-08 Atay Oguzhan See Remarks Conversion · Class B Common Stock 10b5-1 −10,000 2,217,542
2026-06-08 Sakakibara Shan Riku Chief Product Officer Sale 10b5-1 −4,000 $96.45 $386K 216,000
2026-06-08 Sakakibara Shan Riku Chief Product Officer Sale 10b5-1 −4,000 $100.00 $400K 212,000
2026-06-08 Johnson Nancy JoAnn See Remarks Sale 10b5-1 −2,918 $99.09 $289K 32,982
2026-06-08 Johnson Nancy JoAnn See Remarks Sale 10b5-1 −300 $100.05 $30K 32,682
2026-06-08 Johnson Nancy JoAnn See Remarks Sale 10b5-1 −200 $100.99 $20K 32,482
2026-05-11 NeoTribe Ventures I, L.P. 10% owner Other disposition −129,780 1,168,019

Page 19 of 32 · 639 trades