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Sakakibara Shan Riku

Disclosed activity across 1 company

Tapewire entity
26761
SEC CIK
0002088547

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
BillionToOne, Inc.BLLN · Entity 3992Chief Product OfficerSeptember 10, 2026September 14, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

BillionToOne, Inc.

Report date September 10, 2026 · Filed September 14, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Class A Common StockSEC Table I · non-derivativeDirect196,500 Reported balance After 2026-09-10 transaction · row 1
1 source row

Row 1 · 2026-09-10 · Gift · Disposed 3,500 · Balance 196,500

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
September 10, 2026 Filed Sep 14, 2026 22:47 UTC BillionToOne, Inc. BLLN · Entity 3992 GiftClass A Common Stock 3,500 $0.00 $0.00
Disclosure

SEC source: 0002088547-26-000010 · wk-form4_1789426019.xml · nonDerivative · entry 1

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 196,500

Read SEC document
July 31, 2026 Filed Aug 4, 2026 20:32 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 4,000 $140.21 $560,840.00
Disclosure

SEC source: 0002088547-26-000008 · wk-form4_1785875561.xml · nonDerivative · entry 1

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 200,000

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionStock Option (right to buy) · Derivative 1,354 $30.78 Strike: $30.78 $41,676.12
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · derivative · entry 13

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 61,174

Underlying: Class A Common Stock · 1,354 shares

Expires 2035-09-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The options are fully vested and exercisable. The terms of the underlying option grant are as previously reported on the Reporting Person's Form 3 filed on November 5, 2025.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionStock Option (right to buy) · Derivative 1,355 $30.78 Strike: $30.78 $41,706.90
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · derivative · entry 12

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,528

Underlying: Class A Common Stock · 1,355 shares

Expires 2035-09-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The options are fully vested and exercisable. The terms of the underlying option grant are as previously reported on the Reporting Person's Form 3 filed on November 5, 2025.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionStock Option (right to buy) · Derivative 1,117 $30.78 Strike: $30.78 $34,381.26
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · derivative · entry 11

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 63,883

Underlying: Class A Common Stock · 1,117 shares

Expires 2035-09-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The options are fully vested and exercisable. The terms of the underlying option grant are as previously reported on the Reporting Person's Form 3 filed on November 5, 2025.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionStock Option (right to buy) · Derivative 174 $8.65 Strike: $8.65 $1,505.10
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · derivative · entry 10

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 35,826

Underlying: Class A Common Stock · 174 shares

Expires 2033-01-18

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The options are fully vested and exercisable. The terms of the underlying option grant are as previously reported on the Reporting Person's Form 3 filed on November 5, 2025.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 1,354 $125.00 $169,250.00
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 9

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 204,000

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 1,355 $125.00 $169,375.00
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 8

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 205,354

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 1,117 $125.00 $139,625.00
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 7

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 206,709

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 174 $125.00 $21,750.00
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 6

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 207,826

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 4,000 $125.00 $500,000.00
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 5

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 208,000

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionClass A Common Stock 1,354 $30.78 $41,676.12
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 4

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 212,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionClass A Common Stock 1,355 $30.78 $41,706.90
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 3

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 210,646

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionClass A Common Stock 1,117 $30.78 $34,381.26
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 2

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 209,291

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
July 09, 2026 Filed Jul 13, 2026 20:39 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionClass A Common Stock 174 $8.65 $1,505.10
Disclosure

SEC source: 0002088547-26-000006 · wk-form4_1783975155.xml · nonDerivative · entry 1

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 208,174

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
June 24, 2026 Filed Jun 26, 2026 21:20 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionStock Option (right to buy) · Derivative 4,000 $8.65 Strike: $8.65 $34,600.00
Disclosure

SEC source: 0002088547-26-000004 · wk-form4_1782508810.xml · derivative · entry 4

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,000

Underlying: Class A Common Stock · 4,000 shares

Expires 2033-01-18

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The options are fully vested and exercisable. The terms of the underlying option grant are as previously reported on the Reporting Person's Form 3 filed on November 5, 2025.

Read SEC document
June 24, 2026 Filed Jun 26, 2026 21:20 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 4,000 $110.00 $440,000.00
Disclosure

SEC source: 0002088547-26-000004 · wk-form4_1782508810.xml · nonDerivative · entry 3

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 208,000

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
June 24, 2026 Filed Jun 26, 2026 21:20 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 4,000 $110.00 $440,000.00
Disclosure

SEC source: 0002088547-26-000004 · wk-form4_1782508810.xml · nonDerivative · entry 2

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 212,000

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
June 24, 2026 Filed Jun 26, 2026 21:20 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionClass A Common Stock 4,000 $8.65 $34,600.00
Disclosure

SEC source: 0002088547-26-000004 · wk-form4_1782508810.xml · nonDerivative · entry 1

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 216,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:36 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 4,000 $100.00 $400,000.00
Disclosure

SEC source: 0002088547-26-000002 · wk-form4_1781138203.xml · nonDerivative · entry 2

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 212,000

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:36 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 4,000 $96.45 $385,800.00
Disclosure

SEC source: 0002088547-26-000002 · wk-form4_1781138203.xml · nonDerivative · entry 1

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 216,000

F1 · kind: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:12 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 65,000 Not disclosed Strike: $30.78 Not disclosed
Disclosure

SEC source: 0001193125-25-278137 · ownership.xml · derivative · entry 8

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,000

Underlying: Class A Common Stock · 65,000 shares

Expires 2035-09-30

F1 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F1 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F4 · derivative.exercise_date: The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on September 15, 2025, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:12 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 65,000 Not disclosed Strike: $30.78 Not disclosed
Disclosure

SEC source: 0001193125-25-278137 · ownership.xml · derivative · entry 7

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 65,000 shares

Expires 2035-09-30

F1 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F1 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F4 · derivative.exercise_date: The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on September 15, 2025, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:12 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 40,000 Not disclosed Strike: $8.65 Not disclosed
Disclosure

SEC source: 0001193125-25-278137 · ownership.xml · derivative · entry 6

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,000

Underlying: Class A Common Stock · 40,000 shares

Expires 2033-01-18

F1 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F1 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F3 · derivative.exercise_date: The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on January 1, 2023, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:12 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 40,000 Not disclosed Strike: $8.65 Not disclosed
Disclosure

SEC source: 0001193125-25-278137 · ownership.xml · derivative · entry 5

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 40,000 shares

Expires 2033-01-18

F1 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F1 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F3 · derivative.exercise_date: The options are subject to a service-based vesting requirement, which shall be satisfied over a four-year period. The options vest and become exercisable in equal monthly installments commencing on January 1, 2023, subject to the Reporting Person's continuous service with the Issuer through each such vesting date.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:12 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 50,000 Not disclosed Strike: $2.80 Not disclosed
Disclosure

SEC source: 0001193125-25-278137 · ownership.xml · derivative · entry 4

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Class A Common Stock · 50,000 shares

Expires 2031-06-07

F1 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F1 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F2 · derivative.exercise_date: The options are fully vested and exercisable.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:12 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 50,000 Not disclosed Strike: $2.80 Not disclosed
Disclosure

SEC source: 0001193125-25-278137 · ownership.xml · derivative · entry 3

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 50,000 shares

Expires 2031-06-07

F1 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F1 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F2 · derivative.exercise_date: The options are fully vested and exercisable.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:12 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherClass A Common Stock 220,000 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278137 · ownership.xml · nonDerivative · entry 2

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 220,000

F1 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F1 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:12 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherCommon Stock 220,000 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278137 · ownership.xml · nonDerivative · entry 1

Sakakibara Shan Riku · CIK 0002088547 · Chief Product Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

F1 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was automatically reclassified into one share of Class A common stock immediately prior to the completion of the Issuer's initial public offering of Class A common stock.

Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.