Humming Bird Ventures Management NV - 05 Nov 2025 Form 3 Insider Report for BillionToOne, Inc. (BLLN)

Role
10%+ Owner
Signature
Hummingbird Ventures Management NV /s/ Lukas Decoster 49/9 CommV, represented by its permanent representative Lukas Decoster, Director
Issuer symbol
BLLN
Transactions as of
05 Nov 2025
Net transactions value
$0
Form type
3
Filing time
20 Jan 2026, 19:25:53 UTC
Next filing
20 Jan 2026
SEC
View on sec.gov

Reporting Owners (8)

Name Relationship Address Signature Signature date CIK
Humming Bird Ventures Management NV 10%+ Owner SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM Hummingbird Ventures Management NV /s/ Lukas Decoster 49/9 CommV, represented by its permanent representative Lukas Decoster, Director 20 Jan 2026 0002099044
Hummingbird Opportunity Fund II CommV 10%+ Owner SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM /s/ Barend Van den Brande 20 Jan 2026 0002099049
Hummingbird Ventures III CommV 10%+ Owner SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM /s/ Lukas Decoster 20 Jan 2026 0002099047
Hummingbird Dragons CommV 10%+ Owner SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM Hummingbird Opportunity Fund II CommV /s/ Firat Ileri By: Hummingbird Ventures Management NV, its Manager By: Firat Ileri, Permanent Representative 20 Jan 2026 0002099040
Hummingbird Collective CommV 10%+ Owner SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM Hummingbird Ventures III CommV /s/ Firat Ileri By: Hummingbird Ventures Management NV, its Manager By: Firat Ileri, Permanent Representative 20 Jan 2026 0002099041
HB&Q NV (HB&Q COMPARTMENT III) 10%+ Owner SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM Hummingbird Dragons CommV /s/ Firat Ileri By: Hummingbird Ventures Management NV, its Manager By: Firat Ileri, Permanent Representative 20 Jan 2026 0002099035
Van den Brande Barend 10%+ Owner SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM Hummingbird Collective CommV /s/ Firat Ileri By: Hummingbird Ventures Management NV, its Manager By: Firat Ileri, Permanent Representative 20 Jan 2026 0002099027
Decoster Lukas 10%+ Owner SQUARE VICTORIA REGAIN 1, SINT-JOOST-TEN-NODE, BELGIUM HB&Q NV /s/ Firat Ileri By: Hummingbird Ventures Management NV, its Manager By: Firat Ileri, Permanent Representative 20 Jan 2026 0002099021

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding BLLN Common Stock 179,999 05 Nov 2025 See footnotes F1, F2, F8

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding BLLN Series B-2 Convertible Preferred Stock 05 Nov 2025 Common Stock 640,727 See footnotes F1, F3, F4, F8
holding BLLN Series B-1 Convertible Preferred Stock 05 Nov 2025 Common Stock 18,845 See footnotes F1, F3, F5, F8
holding BLLN Series C Convertible Preferred Stock 05 Nov 2025 Common Stock 1,569,015 See footnotes F1, F3, F6, F8
holding BLLN Series D Convertible Preferred Stock 05 Nov 2025 Common Stock 446,103 See footnotes F1, F3, F6, F8
holding BLLN Series A-1 Convertible Preferred Stock 05 Nov 2025 Common Stock 20,000 See footnotes F1, F2, F3, F8
holding BLLN Series A-2 Convertible Preferred Stock 05 Nov 2025 Common Stock 33,000 See footnotes F1, F2, F3, F8
holding BLLN Series B-1 Convertible Preferred Stock 05 Nov 2025 Common Stock 2,261,377 See footnotes F1, F2, F3, F8
holding BLLN Series C Convertible Preferred Stock 05 Nov 2025 Common Stock 137,288 See footnotes F1, F2, F3, F8
holding BLLN Series A-6 Convertible Preferred Stock 05 Nov 2025 Common Stock 2,260,520 See footnotes F1, F3, F7, F8
holding BLLN Series B-2 Convertible Preferred Stock 05 Nov 2025 Common Stock 320,363 See footnotes F1, F3, F7, F8
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Immediately prior to the completion of the Issuer's initial public offering of Class A common stock (the "Offering"), each share of Common Stock shall be reclassified into one share of Class A common stock.
F2 The reported security is directly held by Hummingbird Opportunity Fund II CommV.
F3 The reported security is convertible into the Issuer's Common Stock on a one-for-one basis at any time at the holder's election and shall automatically convert into Class A common stock immediately prior to the closing of the Offering without payment of further consideration. The shares have no expiration date.
F4 The reported security is directly held by HB&Q NV (HB&Q COMPARTMENT III).
F5 The reported security is directly held by Hummingbird Collective CommV.
F6 The reported security is directly held by Hummingbird Dragons CommV.
F7 The reported security is directly held by Hummingbird Ventures III CommV.
F8 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. Firat 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 Persons disclaim beneficial ownership of these shares except to the extent of their pecuniary interests therein.