BillionToOne (BLLN) director and 10% owner receives 3,017 RSU equity award

Rhea-AI Filing Summary

Ileri Firat reported acquisition or exercise transactions in this Form 4 filing.

BillionToOne director and major shareholder Ileri Firat received an equity award in the form of restricted stock units (RSUs). The grant covers 3,017 RSUs of Class A common stock at no cash cost, increasing Firat’s direct holdings to 40,331 shares after the award.

The RSUs carry a service-based vesting condition and will vest on the earlier of the company’s next annual meeting of stockholders or the one-year anniversary of June 10, 2026. This is a compensation-related, non-market transaction rather than an open-market purchase or sale.

Insights

Equity Compensation Analyst

Routine RSU grant compensates a key insider without signaling market views.

The filing shows Ileri Firat, a director and 10% owner of BillionToOne, Inc., receiving 3,017 RSUs of Class A common stock at $0.0000 per share. This is a non-cash, compensation-related award rather than an open-market trade.

The RSUs vest upon a service-based condition tied to either the next annual stockholder meeting or the one-year anniversary of June 10, 2026. After the grant, Firat directly holds 40,331 shares. The transaction is routine and does not, by itself, alter the investment thesis.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Ileri Firat

Role null

Type	Security	Shares	Price	Value
Grant/Award	Class A Common Stock	3,017	$0.00	--

Holdings After Transaction: Class A Common Stock — 40,331 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

RSUs granted: 3,017 RSUs Grant price: $0.0000 per share Shares held after: 40,331 shares +1 more

4 metrics

RSUs granted 3,017 RSUs Grant of Class A common stock units to director

Grant price $0.0000 per share Reported transaction price for RSU award

Shares held after 40,331 shares Total direct Class A holdings after grant

Vesting trigger Earlier of next annual meeting or 1-year from June 10, 2026 Service-based vesting requirement for RSUs

Key Terms

restricted stock units (RSUs), service-based vesting requirement, annual meeting of stockholders, Form 4

4 terms

restricted stock units (RSUs) financial

"The Reporting Person was granted restricted stock units (RSUs), which represent a contingent right to receive one share"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

service-based vesting requirement financial

"The RSUs are subject to a service-based vesting requirement, which shall be satisfied on the earlier"

annual meeting of stockholders financial

"shall be satisfied on the earlier of (A) the date of the next annual meeting of stockholders"

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Ileri Firat

(Last) (First) (Middle)

SQUARE VICTORIA REGAIN 1

(Street)

SINT-JOOST-TEN-NODE 1210

(City) (State) (Zip)

BELGIUM

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/10/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	06/10/2026		A		3,017(1)	A	$0	40,331	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The Reporting Person was granted restricted stock units (RSUs), which represent a contingent right to receive one share of Class A common stock for each RSU. The RSUs are subject to a service-based vesting requirement, which shall be satisfied on the earlier of (A) the date of the next annual meeting of stockholders, or (B) the one-year anniversary of June 10, 2026.

Remarks:

	/s/ Thomas P. Lynch, Attorney-in-Fact	06/11/2026
	** 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 4 (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 4: SEC 1474 (03-26)

FAQ

What insider transaction did BillionToOne (BLLN) report for Ileri Firat?

BillionToOne reported that director and 10% owner Ileri Firat received a grant of 3,017 restricted stock units (RSUs) of Class A common stock. This is a compensation-related acquisition, not an open-market purchase or sale of existing shares.

How many BillionToOne (BLLN) shares does Ileri Firat hold after this Form 4?

After the RSU award, Ileri Firat directly holds 40,331 shares of BillionToOne Class A common stock. This total reflects the newly granted RSUs and provides investors with updated information on Firat’s equity position in the company.

What are the vesting terms of the RSUs granted to Ileri Firat at BillionToOne (BLLN)?

The 3,017 RSUs granted to Ileri Firat vest based on continued service. Vesting occurs on the earlier of the company’s next annual meeting of stockholders or the one-year anniversary of June 10, 2026, according to the Form 4 footnote.

Did BillionToOne (BLLN) report any open-market buying or selling by Ileri Firat?

No open-market buying or selling was reported. The Form 4 shows an A-code transaction, meaning a grant or award acquisition of 3,017 RSUs at $0.0000 per share, which is standard equity compensation rather than a market trade.

Is the RSU grant to Ileri Firat at BillionToOne (BLLN) a cash transaction?

The RSU grant is not a cash transaction. The reported price per share is $0.0000, indicating these are equity-based compensation units that may convert into Class A common stock upon vesting, without Firat paying a purchase price.

What does the transaction code A mean in BillionToOne (BLLN) director Ileri Firat’s Form 4?

Transaction code A on the Form 4 indicates a grant, award, or other acquisition of securities. For BillionToOne, it reflects the issuance of 3,017 RSUs to director and 10% owner Ileri Firat as part of equity compensation.