BillionToOne (BLLN) director awarded 3,017 RSUs of Class A stock

Rhea-AI Filing Summary

BillionToOne, Inc. director Thomas S. Bremner reported an equity award on a Form 4. He acquired 3,017 shares of Class A common stock on a grant/award basis at a price of $0.00 per share, bringing his directly held position to 11,350 shares after the transaction.

According to the footnote, the award consists of restricted stock units (RSUs), each representing a contingent right to receive one share of Class A common stock. These RSUs are subject to a service-based vesting requirement, which will be satisfied on the earlier of the date of the next annual meeting of stockholders or the one-year anniversary of June 10, 2026.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Bremner Thomas S

Role null

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

Holdings After Transaction: Class A Common Stock — 11,350 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

RSUs granted: 3,017 shares Grant price: $0.00 per share Shares after transaction: 11,350 shares +1 more

4 metrics

RSUs granted 3,017 shares Equity award on June 10, 2026

Grant price $0.00 per share Class A common stock award

Shares after transaction 11,350 shares Total Class A common stock directly held

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

Key Terms

restricted stock units (RSUs), service based vesting requirement, annual meeting of stockholders, Class A common stock

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 of Class A common stock for each RSU."

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 of (A) the date of the next annual meeting of stockholders..."

annual meeting of stockholders financial

"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)..."

Class A common stock financial

"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."

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

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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^*

Bremner Thomas S

(Last) (First) (Middle)

1 NORTH WACKER DRIVE, SUITE 2200

(Street)

CHICAGO ILLINOIS 60606-2807

(City) (State) (Zip)

UNITED STATES

(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		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	$0.00	11,350	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.

	/s/ Thomas P. Lynch, Attorney-in-Fact	06/12/2026
	** 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) disclose on this Form 4?

BillionToOne director Thomas S. Bremner reported receiving an equity award. He acquired 3,017 shares of Class A common stock as a grant at $0.00 per share, increasing his directly held position to 11,350 shares following the transaction.

How many BillionToOne (BLLN) shares did Thomas S. Bremner acquire and at what price?

Thomas S. Bremner acquired 3,017 shares of BillionToOne Class A common stock. The shares were granted as an award at a price of $0.00 per share, indicating a compensation-related equity grant rather than an open-market stock purchase.

What is the vesting schedule for the BillionToOne (BLLN) RSUs granted to Thomas S. Bremner?

The RSUs granted to Thomas S. Bremner vest based on continued service. Vesting occurs on the earlier of the date of BillionToOne’s next annual meeting of stockholders or the one-year anniversary of June 10, 2026, according to the Form 4 footnote.

How many BillionToOne (BLLN) shares does Thomas S. Bremner hold after this Form 4 transaction?

After this transaction, Thomas S. Bremner directly holds 11,350 shares of BillionToOne Class A common stock. This figure comes from the Form 4’s “total shares following transaction” field for the reported non-derivative equity award.

Are the BillionToOne (BLLN) shares in this Form 4 immediately issued or contingent RSUs?

The equity reported consists of restricted stock units (RSUs), each representing a contingent right to receive one share of Class A common stock. These RSUs are subject to a service-based vesting requirement, so delivery of shares depends on future vesting conditions being met.