BillionToOne: Nomads holds 27,544 Class A shares

The reported shares are held directly by Nomads Partnership; affiliated reporting persons may be deemed to share beneficial ownership or voting and investment power.

Available on EDGAR 10/30/2026 - 04:30 PM EDT Accepted by SEC EDGAR 10/30/2026 - 04:29 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

BillionToOne, Inc. (BLLN) reports that Nomads Partnership directly holds 27,544 Class A common shares, received as a pro rata distribution in kind for no consideration on September 30, 2026. Nomads Partnership is a non-managing limited partner of Fifty Years Deep, LP. Hummingbird Ventures Management NV, its managing member, may be deemed to beneficially own the shares; Ileri Firat, Barend Van den Brande and Lukas Decoster may be deemed to share voting and investment power. Each is identified as a 10 percent owner, and the reporting persons disclaim beneficial ownership except to the extent of their pecuniary interests.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider Nomads Partnership, Hummingbird Ventures Management NV, Ileri Firat, Van den Brande Barend, Decoster Lukas

Role 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner

Type	Security	Shares	Price	Value
Holding	Class A Common Stock F1, F2	--	--	--

Holdings: Class A Common Stock — 27,544 shares (Direct)

Footnotes (2)

1. F1. Represents shares received as a pro rata distribution in kind, for no consideration, on September 30, 2026 from Fifty Years Deep, LP, of which Nomads Partnership is a non-managing limited partner. Such pro rata distribution in kind was made in accordance with the exemption afforded by Rule 16a-9 of the Securities Exchange Act of 1934, as amended.
2. F2. The reported security is directly held by Nomads Partnership. Hummingbird Ventures Management NV is the managing member of Nomads Partnership and, as a result, may be deemed to beneficially own shares held by Nomads Partnership. 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 Nomads Partnership. The Reporting Persons disclaim beneficial ownership of these shares except to the extent of their pecuniary interests therein.

Key Figures

Class A common shares directly held: 27,544 shares

1 metrics

Class A common shares directly held 27,544 shares Nomads Partnership; reported September 30, 2026

Key Terms

pro rata distribution in kind, Rule 16a-9, pecuniary interests, beneficial ownership

4 terms

pro rata distribution in kind financial

"received as a pro rata distribution in kind"

Rule 16a-9 regulatory

"exemption afforded by Rule 16a-9"

pecuniary interests financial

"except to the extent of their pecuniary interests"

beneficial ownership regulatory

"disclaim beneficial ownership of these shares"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many BLLN shares does Nomads Partnership report holding?

Nomads Partnership directly holds 27,544 Class A common shares. The shares were received as a pro rata distribution in kind for no consideration on September 30, 2026.

Why are other reporting persons associated with BLLN shares held by Nomads Partnership?

Hummingbird Ventures Management NV is Nomads Partnership’s managing member and may be deemed to beneficially own the shares. Its partners Ileri Firat, Barend Van den Brande and Lukas Decoster may be deemed to share voting and investment power; the reporting persons disclaim beneficial ownership except to the extent of their pecuniary interests.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Nomads Partnership

(Last) (First) (Middle)

SQUARE VICTORIA REGINA 1

(Street)

SINT-JOOST-TEN-NODE C9 1210

(City) (State) (Zip)

BELGIUM

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
09/30/2026

3. Issuer Name and Ticker or Trading Symbol
BillionToOne, Inc. [ BLLN ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock	27,544(1)	D(2)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

Nomads Partnership

(Last) (First) (Middle)

SQUARE VICTORIA REGINA 1

(Street)

SINT-JOOST-TEN-NODE C9 1210

(City) (State) (Zip)

BELGIUM

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Hummingbird Ventures Management NV

(Last) (First) (Middle)

SQUARE VICTORIA REGINA 1

(Street)

SINT-JOOST-TEN-NODE C9 1210

(City) (State) (Zip)

BELGIUM

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Ileri Firat

(Last) (First) (Middle)

SQUARE VICTORIA REGINA 1

(Street)

SINT-JOOST-TEN-NODE C9 1210

(City) (State) (Zip)

BELGIUM

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Van den Brande Barend

(Last) (First) (Middle)

SQUARE VICTORIA REGINA 1

(Street)

SINT-JOOST-TEN-NODE C9 1210

(City) (State) (Zip)

BELGIUM

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Decoster Lukas

(Last) (First) (Middle)

SQUARE VICTORIA REGINA 1

(Street)

SINT-JOOST-TEN-NODE C9 1210

(City) (State) (Zip)

BELGIUM

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. Represents shares received as a pro rata distribution in kind, for no consideration, on September 30, 2026 from Fifty Years Deep, LP, of which Nomads Partnership is a non-managing limited partner. Such pro rata distribution in kind was made in accordance with the exemption afforded by Rule 16a-9 of the Securities Exchange Act of 1934, as amended.

2. The reported security is directly held by Nomads Partnership. Hummingbird Ventures Management NV is the managing member of Nomads Partnership and, as a result, may be deemed to beneficially own shares held by Nomads Partnership. 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 Nomads Partnership. The Reporting Persons disclaim beneficial ownership of these shares except to the extent of their pecuniary interests therein.

	HUMMINGBIRD VENTURES MANAGEMENT NV By: 49/9 CommV, its Director By: /s/ Lukas Decoster, Permanent Representative	10/30/2026
	NOMADS PARTNERSHIP By: Hummingbird Ventures Management NV, its Manager By: /s/ Firat Ileri, Permanent Representative	10/30/2026
	/s/ Firat Ileri	10/30/2026
	/s/ Barend Van den Brande	10/30/2026
	/s/ Lukas Decoster	10/30/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)