BillionToOne (BLLN) awards 3,017 RSUs to board director Pagano

Rhea-AI Filing Summary

Pagano Anthony reported acquisition or exercise transactions in this Form 4 filing.

BillionToOne, Inc. director Anthony Pagano reported receiving a grant of 3,017 restricted stock units (RSUs) of Class A common stock at no cash cost. Each RSU represents one share and is subject to a service-based vesting requirement that is satisfied on the earlier of the next annual stockholder meeting or the one-year anniversary of June 10, 2026. Following this equity award, Pagano holds 7,913 shares of Class A common stock directly.

Insights

Equity compensation analyst

Routine director RSU grant with service-based vesting and modest size.

Director Anthony Pagano received 3,017 RSUs of BillionToOne, Inc. Class A common stock at a grant price of $0.00 per share, indicating a standard equity compensation award rather than a market purchase.

The RSUs vest upon satisfying a service-based condition: the earlier of the next annual stockholder meeting or the one-year anniversary of June 10, 2026. This ties the award to continued board service and does not signal an active trading view.

After the grant, Pagano directly holds 7,913 shares, so the award represents a meaningful but not outsized addition to his position. With no derivative positions listed and no trading plan references, this appears to be routine governance-related compensation.

Insider Trade Summary

Net Buyer: 3,017 shares

Net Buy 1 txn

Insider Pagano Anthony

Role Director

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

Holdings After Transaction: Class A Common Stock — 7,913 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

RSUs granted: 3,017 shares Grant price: $0.0000 per share Shares after transaction: 7,913 shares +1 more

4 metrics

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

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

Shares after transaction 7,913 shares Total Class A common shares held directly after grant

Vesting trigger date reference June 10, 2026 One-year anniversary reference for service-based vesting condition

Key Terms

restricted stock units (RSUs), service-based vesting requirement, Class A common stock

3 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"

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 the date of the next annual meeting"

Class A common stock financial

"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.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/12/2026 - 12:54 PM Accepted by SEC EDGAR 06/12/2026 - 12:54 PM Learn about SEC filing dates

FAQ

What insider transaction did BillionToOne (BLLN) report for Anthony Pagano?

BillionToOne reported that director Anthony Pagano received a grant of 3,017 restricted stock units of Class A common stock. The award was reported on Form 4 as a routine equity compensation grant, not an open-market purchase or sale of shares.

How many BillionToOne (BLLN) shares does Anthony Pagano hold after this Form 4?

After the reported RSU grant, Anthony Pagano holds 7,913 shares of BillionToOne Class A common stock directly. This total reflects his position following the 3,017-share restricted stock unit award disclosed in the Form 4 insider filing.

What are the vesting terms of Anthony Pagano’s BillionToOne (BLLN) RSU grant?

Pagano’s 3,017 restricted stock units vest upon a service-based requirement. 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, linking the award to continued board service.

Does the BillionToOne (BLLN) Form 4 show an open-market buy or sell by Anthony Pagano?

No, the Form 4 shows a grant coded “A” for 3,017 restricted stock units, described as a grant, award, or other acquisition. The transaction price per share is reported as $0.0000, indicating equity compensation rather than a market trade.

What does each RSU in Anthony Pagano’s BillionToOne (BLLN) award represent?

Each restricted stock unit in Pagano’s award represents a contingent right to receive one share of BillionToOne Class A common stock. The rights convert into actual shares only when the specified service-based vesting condition is satisfied under the grant terms.

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^*

Pagano Anthony

(Last) (First) (Middle)

C/O BILLIONTOONE, INC.

1035 O'BRIEN DRIVE

(Street)

MENLO PARK CALIFORNIA 94025

(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	7,913	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 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)