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Atay Oguzhan

Disclosed activity across 1 company

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25525
SEC CIK
0002088549

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
BillionToOne, Inc.BLLN · Entity 3992Director · Chairman and CEOOctober 12, 2026October 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 October 12, 2026 · Filed October 14, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Class A Common StockSEC Table I · non-derivativeDirect0 Ending reported balance After 2026-10-12 transaction · row 6
6 source rows · reconciled sequence

Row 1 · 2026-10-12 · Exercise / conversion · Acquired 16,667 · Balance 16,667

F1: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

Row 2 · 2026-10-12 · Sale · Disposed 1,961 · Balance 14,706

F1: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F2: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.250 to $92.170 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Row 3 · 2026-10-12 · Sale · Disposed 2,553 · Balance 12,153

F1: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F3: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.2596 to $93.255 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Row 4 · 2026-10-12 · Sale · Disposed 6,763 · Balance 5,390

F1: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F4: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93.260 to $94.225 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Row 5 · 2026-10-12 · Sale · Disposed 3,869 · Balance 1,521

F1: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F5: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $94.265 to $95.205 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Row 6 · 2026-10-12 · Sale · Disposed 1,521 · Balance 0

F1: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F6: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $95.945 to $96.765 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Class A Common StockSEC Table I · non-derivativeIndirectBy spouse151,835 Reported balance After 2026-10-12 transaction · row 7 Account identity is unresolved; indirect or unspecified ownership is not merged.
1 source row

Row 7 · 2026-10-12 · Sale · Disposed 2,667 · Balance 151,835

F7: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person's spouse on June 7, 2026.

F8: Represents shares held by the Reporting Person's spouse.

Stock Option (right to buy)SEC Table II · derivative / convertible security · Conversion / exercise price $2.80 · Expires 2031-06-07Direct476,962 Reported balance After 2026-10-12 transaction · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2026-10-12 · Exercise / conversion · Disposed 16,667 · Balance 476,962

F9: The options are fully vested and exercisable.

Filing footnotes · ownership attribution and instrument terms

F1: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.

F2: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.250 to $92.170 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.2596 to $93.255 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F4: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93.260 to $94.225 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F5: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $94.265 to $95.205 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F6: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $95.945 to $96.765 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F7: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person's spouse on June 7, 2026.

F8: Represents shares held by the Reporting Person's spouse.

F9: The options are fully vested and exercisable.

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.”

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Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 ConversionClass B Common Stock · Derivative 10,000 $0.00 $0.00
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · derivative · entry 17

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,217,542

Underlying: Class A Common Stock · 10,000 shares

Expires not disclosed

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.

F8 · derivative.exercise_price: These shares of Class B common stock were converted at a 1:1 ratio for shares of Class A common stock at the option of the holder.

F11 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock.

F8 · price: These shares of Class B common stock were converted at a 1:1 ratio for shares of Class A common stock at the option of the holder.

F11 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock.

F11 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionStock Option (right to buy) · Derivative 6,250 $2.80 Strike: $2.80 $17,500.00
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · derivative · entry 16

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 613,750

Underlying: Class A Common Stock · 6,250 shares

Expires 2031-06-07

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.

F10 · derivative.exercise_date: The options are fully vested and exercisable.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionStock Option (right to buy) · Derivative 20,000 $2.80 Strike: $2.80 $56,000.00
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · derivative · entry 15

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 620,000

Underlying: Class A Common Stock · 20,000 shares

Expires 2031-06-07

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.

F10 · derivative.exercise_date: The options are fully vested and exercisable.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 6,250 $100.00 $625,000.00
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 14

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Indirect · By spouse

Disclosed balance after: 187,500

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.

F9 · ownership.nature: Represents shares held by the Reporting Person's spouse.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 6,250 $96.45 $602,812.50
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 13

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Indirect · By spouse

Disclosed balance after: 193,750

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.

F9 · ownership.nature: Represents shares held by the Reporting Person's spouse.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 ConversionClass A Common Stock 10,000 $0.00 $0.00
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 11

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 10,000

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.

F8 · kind: These shares of Class B common stock were converted at a 1:1 ratio for shares of Class A common stock at the option of the holder.

F8 · price: These shares of Class B common stock were converted at a 1:1 ratio for shares of Class A common stock at the option of the holder.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 6,250 $100.00 $625,000.00
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 10

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

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 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 556 $99.97 $55,582.65
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 9

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,250

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.

F7 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $99.640 to $100.540 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 3,605 $99.06 $357,122.12
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 8

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 6,806

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.

F6 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $98.560 to $99.550 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 4,066 $98.12 $398,959.58
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 7

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 10,411

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.

F5 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $97.560 to $98.5428 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 4,372 $96.89 $423,612.26
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 6

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 14,477

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.

F4 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $96.530 to $97.2113 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 1,856 $95.59 $177,414.67
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 5

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 18,849

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.

F3 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $95.320 to $96.225 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 5,466 $94.76 $517,972.92
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 4

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 20,705

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.

F2 · price: The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $94.300 to $95.280 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Read SEC document
June 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 SaleClass A Common Stock 79 $100.87 $7,968.73
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 3

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 26,171

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 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionClass A Common Stock 6,250 $2.80 $17,500.00
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 2

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 26,250

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 08, 2026 Filed Jun 11, 2026 00:35 UTC BillionToOne, Inc. BLLN · Entity 3992 Exercise / conversionClass A Common Stock 20,000 $2.80 $56,000.00
Disclosure

SEC source: 0002088549-26-000002 · wk-form4_1781138152.xml · nonDerivative · entry 1

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 20,000

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
November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 1,003,102 Not disclosed Strike: $20.04 Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · derivative · entry 14

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,003,102

Underlying: Class A Common Stock · 1,003,102 shares

Expires 2035-06-18

F1 · kind: The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock.

F1 · price: The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock.

F8 · derivative.exercise_date: The options are subject to a service-based vesting requirement, which shall be satisfied over a six-year period. The options vest and become exercisable in equal monthly installments commencing on June 11, 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 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 1,003,102 Not disclosed Strike: $20.04 Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · derivative · entry 13

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,003,102 shares

Expires 2035-06-18

F1 · kind: The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock.

F1 · price: The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock.

F8 · derivative.exercise_date: The options are subject to a service-based vesting requirement, which shall be satisfied over a six-year period. The options vest and become exercisable in equal monthly installments commencing on June 11, 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 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 640,000 Not disclosed Strike: $2.80 Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · derivative · entry 12

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 640,000

Underlying: Class A Common Stock · 640,000 shares

Expires 2031-06-07

F1 · kind: The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock.

F1 · price: The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock.

F7 · derivative.exercise_date: The options are fully vested and exercisable.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherStock Option (right to buy) · Derivative 640,000 Not disclosed Strike: $2.80 Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · derivative · entry 11

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 640,000 shares

Expires 2031-06-07

F1 · kind: The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock.

F1 · price: The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock.

F7 · derivative.exercise_date: The options are fully vested and exercisable.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherClass B Common Stock · Derivative 2,227,542 $0.00 $0.00
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · derivative · entry 10

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,227,542

Underlying: Class A Common Stock · 2,227,542 shares

Expires not disclosed

F6 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock.

F5 · kind: Following the reclassification of Common Stock into Class A Common Stock, these shares of Class A common stock were exchanged at a 1:1 ratio for shares of Class B common stock in a transaction previously approved by the Issuer's board of directors.

F6 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock.

F6 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A common stock at the option of the holder. Class B common stock will convert automatically on a one-for-one basis into shares of the Issuer's Class A common stock upon the earliest of (i) seven years from the date of filing of the amended and restated certificate of incorporation, in connection with the Offering and (ii) the date specified by a vote of the holders of Class B common stock representing a majority of the outstanding shares of Class B common stock.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 ConversionSeries A-1 Convertible Preferred Stock · Derivative 262,434 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · derivative · entry 9

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 262,434 shares

Expires not disclosed

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_price: The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the "Offering") without payment of further consideration. The shares have no expiration date.

F2 · price: The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the "Offering") without payment of further consideration. The shares have no expiration date.

F2 · derivative.exercise_date: The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the "Offering") without payment of further consideration. The shares have no expiration date.

F2 · derivative.expiration_date: The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the "Offering") without payment of further consideration. The shares have no expiration date.

Read SEC document
November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherClass A Common Stock 2,227,542 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · nonDerivative · entry 8

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F5 · kind: Following the reclassification of Common Stock into Class A Common Stock, these shares of Class A common stock were exchanged at a 1:1 ratio for shares of Class B common stock in a transaction previously approved by the Issuer's board of directors.

F5 · price: Following the reclassification of Common Stock into Class A Common Stock, these shares of Class A common stock were exchanged at a 1:1 ratio for shares of Class B common stock in a transaction previously approved by the Issuer's board of directors.

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November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherClass A Common Stock 200,000 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · nonDerivative · entry 7

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · By spouse

Disclosed balance after: 200,000

F3 · 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 Offering.

F3 · 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 Offering.

F4 · ownership.nature: Represents shares held by the Reporting Person's spouse.

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November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherClass A Common Stock 1,965,108 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · nonDerivative · entry 6

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,227,542

F3 · 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 Offering.

F3 · 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 Offering.

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November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherClass A Common Stock 262,434 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · nonDerivative · entry 5

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 262,434

F3 · 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 Offering.

F3 · 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 Offering.

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November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherCommon Stock 200,000 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · nonDerivative · entry 4

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Indirect · By spouse

Disclosed balance after: 0

F3 · 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 Offering.

F3 · 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 Offering.

F4 · ownership.nature: Represents shares held by the Reporting Person's spouse.

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November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherCommon Stock 1,965,108 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · nonDerivative · entry 3

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · 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 Offering.

F3 · 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 Offering.

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November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 OtherCommon Stock 262,434 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · nonDerivative · entry 2

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F3 · 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 Offering.

F3 · 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 Offering.

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November 07, 2025 Filed Nov 12, 2025 23:14 UTC BillionToOne, Inc. BLLN · Entity 3992 ConversionCommon Stock 262,434 Not disclosed Not disclosed
Disclosure

SEC source: 0001193125-25-278140 · ownership.xml · nonDerivative · entry 1

Atay Oguzhan · CIK 0002088549 · Director · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 262,434

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 · kind: The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the "Offering") without payment of further consideration. The shares have no expiration date.

F2 · price: The reported security converted into the Issuer's Common Stock on a one-for-one basis automatically immediately prior to the closing of the Issuer's initial public offering of Class A common stock (the "Offering") without payment of further consideration. The shares have no expiration date.

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