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BillionToOne, Inc. planned insider sales

In the last twelve months insiders at BillionToOne, Inc. filed 53 Form 144 notices of planned sales, 488,563 shares worth $52.8 million at the time of filing, from 6 sellers. The latest, filed 28 October 2026: Atay Oguzhan (member of immediate family of any of the foregoing), 2,667 shares worth $314,706, planned for around 28 October 2026 through Fidelity Brokerage Services LLC. One notice's value as filed does not match the share price that day; it is marked in the table.

FiledSellerRelationshipSharesValuePlanned saleSold, per Form 4BrokerHow acquiredFiling
28 October 2026Atay OguzhanMember of immediate family of any of the foregoing2,667$314,70628 October 2026None on Form 4 yetFidelity Brokerage Services LLCPre-IPO SharesForm 144
28 October 2026Atay OguzhanOfficer, Director8,333$983,29428 October 202611,000 shares from 28 October 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
15 October 2026Atay OguzhanOfficer, Director5,150$516,18915 October 202611,000 shares from 14 October 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
14 October 2026Atay OguzhanMember of immediate family of any of the foregoing2,667$261,36614 October 2026None on Form 4 yetFidelity Brokerage Services LLCPre-IPO SharesForm 144
14 October 2026Atay OguzhanOfficer, Director3,183$313,02014 October 2026None on Form 4 yetFidelity Brokerage Services LLCStock Option ExerciseForm 144
13 October 2026Atay OguzhanMember of immediate family of any of the foregoing2,667$260,32612 October 2026None on Form 4 yetFidelity Brokerage Services LLCStock Option ExerciseForm 144
13 October 2026Atay OguzhanOfficer, Director16,667$1.6 million12 October 202619,334 shares from 12 October 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
5 October 2026Tsao DavidOfficer, Director1,750$184,0125 October 2026None on Form 4 yetFidelity Brokerage Services LLCPre-IPO SharesForm 144
5 October 2026ten Bosch John RoderickOfficer2,834$297,9955 October 20262,834 shares from 5 October 2026Fidelity Brokerage Services LLCPre IPO sharesForm 144
5 October 2026Tsao DavidOfficer, Director20,000$2.2 million5 October 202620,000 shares from 5 October 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
28 September 2026Atay OguzhanMember of immediate family of any of the foregoing2,666$321,62628 September 2026None on Form 4 yetFidelity Brokerage Services LLCPre-IPO SharesForm 144
28 September 2026Atay OguzhanOfficer, Director8,333$1.0 million28 September 202610,999 shares from 28 September 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
24 September 2026ten Bosch John RoderickOfficer1,416$169,92024 September 20261,416 shares from 24 September 2026Fidelity Brokerage Services LLCPre-IPO sharesForm 144
24 September 2026Tsao DavidOfficer, Director3,333$416,62524 September 20263,333 shares from 24 September 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
21 September 2026ten Bosch John RoderickOfficer1,416$150,96021 September 20261,416 shares from 21 September 2026Fidelity Brokerage Services LLCPre IPO sharesForm 144
17 September 2026Lynch Thomas P.Officer35,112$3.9 million17 September 202635,112 shares from 17 September 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
14 September 2026Atay OguzhanMember of immediate family of any of the foregoing5,332$522,53614 September 2026None on Form 4 yetFidelity Brokerage Services LLCPre-IPO sharesForm 144
14 September 2026Atay OguzhanOfficer, Director24,999$2.5 million14 September 202630,331 shares from 14 September 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
9 September 2026ten Bosch John RoderickOfficer1,416$138,1179 September 20261,416 shares from 9 September 2026Fidelity Brokerage Services LLCPre IPO sharesForm 144
9 September 2026Tsao DavidOfficer, Director1,750$170,6959 September 2026None on Form 4 yetFidelity Brokerage Services LLCPre IPO SharesForm 144
9 September 2026Tsao DavidOfficer, Director20,000$2.0 million9 September 202620,000 shares from 9 September 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
8 September 2026Lynch Thomas P.Officer20,000$2.0 million8 September 202620,000 shares from 8 September 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
25 August 2026ten Bosch John RoderickOfficer1,417$141,70025 August 20261,417 shares from 25 August 2026Fidelity Brokerage Services LLCPre IPO SharesForm 144
25 August 2026Tsao DavidOfficer, Director10,000$1.0 million25 August 202610,000 shares from 25 August 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
10 August 2026ten Bosch John RoderickOfficer1,417$131,58310 August 20261,417 shares from 10 August 2026Fidelity Brokerage Services LLCPre IPO SharesForm 144
10 August 2026Tsao DavidOfficer, Director3,500$325,01010 August 2026None on Form 4 yetFidelity Brokerage Services LLCPre-IPO SharesForm 144
10 August 2026Tsao DavidOfficer, Director10,000$928,60010 August 202610,000 shares from 10 August 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
5 August 2026Atay OguzhanOfficer, Director15,539$2.3 million5 August 202615,539 shares from 5 August 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
3 August 2026Atay OguzhanOfficer, Director2,500$343,4253 August 2026None on Form 4 yetFidelity Brokerage Services LLCPre-IPO SharesForm 144
3 August 2026Atay OguzhanMember of immediate family of any of the foregoing12,500$1.7 million3 August 2026None on Form 4 yetFidelity Brokerage Services LLCPre-IPO SharesForm 144
3 August 2026Atay OguzhanOfficer, Director32,500$4.5 million3 August 202645,000 shares from 3 August 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
31 July 2026Sakakibara Shan RikuOfficer4,000$560,84031 July 20264,000 shares from 31 July 2026Fidelity Brokerage Services LLCPre-IPOForm 144
16 July 2026Johnson Nancy JoAnnOfficer14,199$1.8 million16 July 202614,199 shares from 16 July 2026Fidelity Brokerage Services LLCPre-IPO SharesForm 144
13 July 2026Tsao DavidOfficer, Director20,000$250,498
value as filed; does not match the share price that day		13 July 2026No matching Form 4 saleFidelity Brokerage Services LLCStock Option ExerciseForm 144
13 July 2026Tsao DavidOfficer, Director3,500$439,11013 July 202620,000 shares from 13 July 2026Fidelity Brokerage Services LLCPre IPO SharesForm 144
13 July 2026ten Bosch John RoderickOfficer4,251$533,33013 July 20264,251 shares from 13 July 2026Fidelity Brokerage Services LLCPre IPO SharesForm 144
9 July 2026Sakakibara Shan RikuOfficer8,000$1.0 million9 July 20268,000 shares from 9 July 2026Fidelity Brokerage Services LLCPre-IPO shares; Stock Option ExerciseForm 144
9 July 2026Atay OguzhanOfficer, Director12,500$1.6 million9 July 202612,500 shares from 9 July 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
6 July 2026Atay OguzhanOfficer, Director2,500$300,0006 July 2026No matching Form 4 saleFidelity Brokerage Services LLCPre-IPO SharesForm 144
6 July 2026Atay OguzhanMember of immediate family of any of the foregoing12,500$1.5 million6 July 2026No matching Form 4 saleFidelity Brokerage Services LLCPre-IPO SharesForm 144
6 July 2026Atay OguzhanOfficer, Director26,250$3.1 million6 July 202638,750 shares from 6 July 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
1 July 2026Johnson Nancy JoAnnOfficer801$100,0561 July 2026801 shares from 1 July 2026Fidelity Brokerage Services LLCPre-IPO SharesForm 144
29 June 2026ten Bosch John RoderickOfficer1,416$169,92029 June 20261,416 shares from 29 June 2026Fidelity Brokerage Services LLCPre IPO SharesForm 144
24 June 2026Sakakibara Shan RikuOfficer8,000$880,00024 June 20268,000 shares from 24 June 2026Fidelity Brokerage Services LLCPre-IPO shares; Stock Option ExerciseForm 144
15 June 2026ten Bosch John RoderickOfficer2,832$287,36315 June 20262,832 shares from 15 June 2026Fidelity Brokerage Services LLCPre-IPO SharesForm 144
15 June 2026Tsao DavidOfficer, Director3,500$355,14515 June 2026No matching Form 4 saleFidelity Brokerage Services LLCPre-IPO SharesForm 144
15 June 2026Tsao DavidOfficer, Director20,000$2.0 million15 June 202620,000 shares from 15 June 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
9 June 2026Johnson Nancy JoAnnOfficer10,582$1.1 million9 June 202614,000 shares from 8 June 2026Fidelity Brokerage Services LLCPre-IPO SharesForm 144
8 June 2026Atay OguzhanOfficer, Director2,500$245,5628 June 2026No matching Form 4 saleFidelity Brokerage Services LLCPre-IPO SharesForm 144
8 June 2026Johnson Nancy JoAnnOfficer3,418$339,3478 June 2026No matching Form 4 saleFidelity Brokerage Services LLCPre-IPO SharesForm 144
8 June 2026Sakakibara Shan RikuOfficer8,000$785,8008 June 20268,000 shares from 8 June 2026Fidelity Brokerage Services LLCPre IPO sharesForm 144
8 June 2026Atay OguzhanMember of immediate family of any of the foregoing12,500$1.2 million8 June 2026No matching Form 4 saleFidelity Brokerage Services LLCPre-IPO SharesForm 144
8 June 2026Atay OguzhanOfficer, Director26,250$2.6 million8 June 202638,750 shares from 8 June 2026Fidelity Brokerage Services LLCStock Option ExerciseForm 144
A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was.
Read moreValue is the filer's own aggregate market value. Sold, per Form 4: the same seller's open-market sales on Form 4 from the notice's date to 90 days after, added up, as they appear on the insiders page; a holder who files no Form 4, such as some large holders, never shows one. What is a Form 144?