BillionToOne (BLLN) director and 10% owner awarded 3,017 RSUs in stock grant

Rhea-AI Filing Summary

KOLLURI KRISHNA KITTU reported acquisition or exercise transactions in this Form 4 filing.

BillionToOne, Inc. director and 10% owner Krishna Kittu Kolluri received a grant of 3,017 shares of Class A common stock in the form of restricted stock units at no cash cost. Following this award, he holds 11,350 shares directly, subject to service-based vesting tied to the next annual stockholder meeting or the one-year anniversary of June 10, 2026.

Insights

Equity compensation analyst

Routine RSU grant increases director’s equity stake without open‑market trading.

The filing shows Krishna Kittu Kolluri, a director and 10% owner of BillionToOne, Inc., received 3,017 restricted stock units (RSUs) of Class A common stock at a price of $0.00 per share as compensation rather than through market purchases.

The RSUs vest upon a service-based condition, satisfied on the earlier of the next annual stockholder meeting or the one-year anniversary of June 10, 2026. This is a standard governance-aligned structure that ties director equity to ongoing board service.

After this award, Kolluri directly holds 11,350 shares of Class A common stock. There are no sales or option exercises in this filing, so the event mainly reflects routine equity-based compensation and a modest increase in his reported direct ownership.

Insider Trade Summary

Net Buyer: 3,017 shares

Net Buy 1 txn

Insider KOLLURI KRISHNA KITTU

Role Director, 10% Owner

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

Holdings After Transaction: Class A Common Stock — 11,350 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 Price per share: $0.00 per share Total shares after grant: 11,350 shares +2 more

5 metrics

RSUs granted 3,017 shares Restricted stock units of Class A common stock granted on June 10, 2026

Price per share $0.00 per share Grant/award acquisition of RSUs

Total shares after grant 11,350 shares Direct Class A common stock holdings following the RSU award

Transaction code A Grant, award, or other acquisition of non-derivative securities

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

Key Terms

restricted stock units (RSUs), service-based vesting requirement, Class A Common Stock, Grant, award, or other acquisition

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"

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"

Class A Common Stock financial

"security_title: Class A Common Stock"

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.

Grant, award, or other acquisition regulatory

"transaction_code_description: Grant, award, or other acquisition"

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Available on EDGAR 06/12/2026 - 12:55 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 Krishna Kittu Kolluri?

BillionToOne reported that director and 10% owner Krishna Kittu Kolluri received 3,017 restricted stock units of Class A common stock. The award was a compensation grant at no cash cost, increasing his directly held shares to 11,350 after the transaction.

How many BillionToOne (BLLN) shares did Krishna Kittu Kolluri acquire in this Form 4?

Krishna Kittu Kolluri acquired 3,017 shares of BillionToOne Class A common stock through a restricted stock unit grant. These RSUs convert into one share each upon vesting, representing additional equity compensation rather than an open-market purchase of existing shares.

What is Krishna Kittu Kolluri’s total BillionToOne (BLLN) shareholding after this transaction?

Following the RSU award, Krishna Kittu Kolluri directly holds 11,350 shares of BillionToOne Class A common stock. This total includes the newly granted 3,017 restricted stock units, which are structured to settle into shares once the specified service-based vesting condition is satisfied.

What are the vesting conditions for the BillionToOne (BLLN) RSUs granted to Krishna Kittu Kolluri?

The RSUs granted to Krishna Kittu Kolluri 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, aligning the award with his ongoing board tenure.

Did the BillionToOne (BLLN) Form 4 show any insider stock sales by Krishna Kittu Kolluri?

No, the Form 4 shows only an acquisition via a restricted stock unit grant to Krishna Kittu Kolluri. The transaction code is “A” for a grant or award, with no reported open-market sales, dispositions, or option exercises in this particular filing.

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^*

KOLLURI KRISHNA KITTU

(Last) (First) (Middle)

1300 EL CAMINO REAL, SUITE 100

(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	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	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.

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)