Krishna Kittu Kolluri - 05 Nov 2025 Form 3 Insider Report for BillionToOne, Inc.

Role
Director, 10%+ Owner
Signature
/s/ Thomas P. Lynch, Attorney-in-Fact
Issuer symbol
BLLN on Nasdaq
Transactions as of
05 Nov 2025
Net transactions value
$0
Form type
3
Filing time
05 Nov 2025, 21:30:17 UTC
Next filing
10 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
KOLLURI KRISHNA KITTU Director, 10%+ Owner 1300 EL CAMINO REAL, SUITE 100, MENLO PARK /s/ Thomas P. Lynch, Attorney-in-Fact 05 Nov 2025 0001270521

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding BLLN Common Stock 119,999 05 Nov 2025 See footnotes F1, F2

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-1 Convertible Preferred Stock 05 Nov 2025 Common Stock 1,177,800 See footnotes F1, F2, F3
holding BLLN Series C Convertible Preferred Stock 05 Nov 2025 Common Stock 242,216 See footnotes F1, F3, F4
holding BLLN Series A-1 Convertible Preferred Stock 05 Nov 2025 Common Stock 16,746 See footnotes F1, F3, F5, F6
holding BLLN Series A-3 Convertible Preferred Stock 05 Nov 2025 Common Stock 19,985 See footnotes F1, F3, F6, F7
holding BLLN Series A-6 Convertible Preferred Stock 05 Nov 2025 Common Stock 2,318,482 See footnotes F1, F3, F6, F8
holding BLLN Series B-2 Convertible Preferred Stock 05 Nov 2025 Common Stock 320,363 See footnotes F1, F3, F6, F9
holding BLLN Series C-1 Convertible Preferred Stock 05 Nov 2025 Common Stock 143,914 See footnotes F1, F3, F6, F10
* 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 Neotribe Ignite Fund I, L.P. ("NTIF I"). Neotribe Ignite Partners I, LLC ("NTIP I") is the general partner of NTIF I. Krishna Kittu Kolluri ("Kolluri") is the managing member of NTIP I and therefore may be deemed to have voting and dispositive power over the shares held by NTIF I. Kolluri disclaims beneficial ownership of the shares held by NTIF I except to the extent of his pecuniary interest therein.
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 Neotribe SPV I BTO, LLC ("NT SPV I"). Neotribe Partners SPV I BTO, LLC ("NTP SPV I") is the managing member of NT SPV I. Kolluri is the managing member of NTP SPV I and therefore may be deemed to have voting and dispositive power over the shares held by NT SPV I. Kolluri disclaims beneficial ownership of the shares held by NT SPV I except to the extent of his pecuniary interest therein.
F5 Consists of 16,098 shares held of record by NTV I for itself and 648 shares held of record by NTV I as nominee for NTA I.
F6 The reported security is directly held by NeoTribe Ventures I, L.P. ("NTV I"), for itself and as nominee for NeoTribe Associates I, L.P. ("NTA I"). NeoTribe Partners I, LLC ("NTP I") is the general partner of NTV I and NTA I. Kolluri is the managing member of NTP I and therefore may be deemed to hold voting and dispositive power over the shares held by NTV I and NTA I. Kolluri disclaims beneficial ownership of the shares held by NTV I and NTA I except to the extent of his pecuniary interest therein.
F7 Consists of 19,211 shares held of record by NTV I for itself and 774 shares held of record by NTV I as nominee for NTA I.
F8 Consists of 2,228,682 shares held of record by NTV I for itself and 89,800 shares held of record by NTV I as nominee for NTA I.
F9 Consists of 307,955 shares held of record by NTV I for itself and 12,408 shares held of record by NTV I as nominee for NTA I.
F10 Consists of 138,340 shares held of record by NTV I for itself and 5,574 shares held of record by NTV I as nominee for NTA I.

Remarks:

This Form 3 is one of two Form 3s filed on the date hereof in respect of these shares. The Reporting Person for the other Form 3 is NeoTribe Ventures I, L.P. Exhibit 24 - Power of Attorney