Key facts
- This page summarizes Firat Ileri's Form 4 filing for BillionToOne, Inc..
- 30 reported transactions and 11 derivative rows are listed below.
- Accepted by SEC: 10 Nov 2025, 21:38.
Firat Ileri - 06 Nov 2025 Form 4 Insider Report for BillionToOne, Inc.
- Reporting relationship
- Director, 10%+ Owner
- Issuer ticker
- BLLN on Nasdaq
- Reported as of
- 06 Nov 2025
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 10 Nov 2025, 21:38:58 UTC
- Prior SEC filing
- 05 Nov 2025
- Next SEC filing
- 12 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Thomas P. Lynch, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Firat Ileri filed Form 4 for BillionToOne, Inc. on 10 Nov 2025.
Change
- Previous filing in this sequence was filed on 05 Nov 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0002087908
Primary reporting owner
Ileri Firat
- Relationship
- Director, 10%+ Owner
- Address
- SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM
- Signature
- /s/ Thomas P. Lynch, Attorney-in-Fact
- Signature date
- 10 Nov 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
BLLN
transaction
Common Stock
Award
- Transaction value
- $0
- Shares
- +8,333
- Change %
- Price
- $0.000000
- Shares after
- 8,333
- Date
- 06 Nov 2025
- Ownership
- Direct
- Footnotes
- F1
BLLN
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +28,981
- Change %
- +348%
- Price
- Shares after
- 37,314
- Date
- 07 Nov 2025
- Ownership
- Direct
- Footnotes
- F2, F3
BLLN
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +640,727
- Change %
- Price
- Shares after
- 640,727
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F2, F3, F4, F9
BLLN
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +18,845
- Change %
- Price
- Shares after
- 18,845
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F2, F3, F5, F9
BLLN
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +2,015,118
- Change %
- Price
- Shares after
- 2,015,118
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F2, F3, F6, F9
BLLN
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +2,451,665
- Change %
- +1362%
- Price
- Shares after
- 2,631,664
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F2, F3, F7, F9
BLLN
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +2,580,833
- Change %
- Price
- Shares after
- 2,580,833
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F2, F3, F8, F9
BLLN
transaction
Common Stock
Other
- Transaction value
- Shares
- -37,314
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- Direct
- Footnotes
- F10
BLLN
transaction
Common Stock
Other
- Transaction value
- Shares
- -640,727
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F4, F9, F10
BLLN
transaction
Common Stock
Other
- Transaction value
- Shares
- -18,845
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F5, F9, F10
BLLN
transaction
Common Stock
Other
- Transaction value
- Shares
- -2,015,118
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F6, F9, F10
BLLN
transaction
Common Stock
Other
- Transaction value
- Shares
- -2,631,664
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F7, F9, F10
BLLN
transaction
Common Stock
Other
- Transaction value
- Shares
- -2,580,833
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F8, F9, F10
BLLN
transaction
Class A Common Stock
Other
- Transaction value
- Shares
- +37,314
- Change %
- Price
- Shares after
- 37,314
- Date
- 07 Nov 2025
- Ownership
- Direct
- Footnotes
- F10
BLLN
transaction
Class A Common Stock
Other
- Transaction value
- Shares
- +640,727
- Change %
- Price
- Shares after
- 640,727
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F4, F9, F10
BLLN
transaction
Class A Common Stock
Other
- Transaction value
- Shares
- +18,845
- Change %
- Price
- Shares after
- 18,845
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F5, F9, F10
BLLN
transaction
Class A Common Stock
Other
- Transaction value
- Shares
- +2,015,118
- Change %
- Price
- Shares after
- 2,015,118
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F6, F9, F10
BLLN
transaction
Class A Common Stock
Other
- Transaction value
- Shares
- +2,631,664
- Change %
- Price
- Shares after
- 2,631,664
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F7, F9, F10
BLLN
transaction
Class A Common Stock
Other
- Transaction value
- Shares
- +2,580,833
- Change %
- Price
- Shares after
- 2,580,833
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Footnotes
- F8, F9, F10
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
BLLN
transaction
Derivative
Series A-6 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -28,981
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 28,981
- Exercise price
- Footnotes
- F3
BLLN
transaction
Derivative
Series B-2 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -640,727
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 640,727
- Exercise price
- Footnotes
- F3, F4, F9
BLLN
transaction
Derivative
Series B-1 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -18,845
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 18,845
- Exercise price
- Footnotes
- F3, F5, F9
BLLN
transaction
Derivative
Series C Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -1,569,015
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 1,569,015
- Exercise price
- Footnotes
- F3, F6, F9
BLLN
transaction
Derivative
Series D Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -446,103
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 446,103
- Exercise price
- Footnotes
- F3, F6, F9
BLLN
transaction
Derivative
Series A-1 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -20,000
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 20,000
- Exercise price
- Footnotes
- F3, F7, F9
BLLN
transaction
Derivative
Series A-2 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -33,000
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 33,000
- Exercise price
- Footnotes
- F3, F7, F9
BLLN
transaction
Derivative
Series B-1 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -2,261,377
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 2,261,377
- Exercise price
- Footnotes
- F3, F7, F9
BLLN
transaction
Derivative
Series C Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -137,288
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 137,288
- Exercise price
- Footnotes
- F3, F7, F9
BLLN
transaction
Derivative
Series A-6 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -2,260,520
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 2,260,520
- Exercise price
- Footnotes
- F3, F8, F9
BLLN
transaction
Derivative
Series B-2 Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -320,363
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 07 Nov 2025
- Ownership
- See Footnotes
- Underlying class
- Common Stock
- Underlying amount
- 320,363
- Exercise price
- Footnotes
- F3, F8, F9
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 10 footnotes
Footnote F1
Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs shall vest over three years in equal annual installments on the anniversary of November 6, 2025, subject to the Reporting Person's continuous service to the Issuer through each such vesting date.
Footnote F2
The total represents shares received upon conversion of shares of Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series A-6 Convertible Preferred Stock, Series B-1 Convertible Preferred Stock, Series B-2 Convertible Preferred Stock, Series C Convertible Preferred Stock and/or Series D Convertible Preferred Stock.
Footnote F3
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.
Footnote F4
The reported security is directly held by HB&Q NV (HB&Q COMPARTMENT III).
Footnote F5
The reported security is directly held by Hummingbird Collective CommV.
Footnote F6
The reported security is directly held by Hummingbird Dragons CommV.
Footnote F7
The reported security is directly held by Hummingbird Opportunity Fund II CommV.
Footnote F8
The reported security is directly held by Hummingbird Ventures III CommV.
Footnote F9
Humming Bird Ventures Management NV is the managing member of Hummingbird Opportunity Fund II CommV, Hummingbird Ventures III CommV, Hummingbird Dragons CommV, Hummingbird Collective CommV, and HB&Q NV (HB&Q COMPARTMENT III) (the Hummingbird Funds) and, as a result, may be deemed to beneficially own shares held by the Hummingbird Funds. Mr. Ileri, Barend Van den Brande, and Lukas Decoster are partners of Hummingbird Ventures Management NV and may be deemed to have shared voting and investment power over the shares held by the Hummingbird Funds. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
Footnote F10
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.