BillionToOne (BLLN) SVP sells 1,417 shares in Rule 10b5-1 planned trade

Rhea-AI Filing Summary

BillionToOne, Inc. senior vice president of laboratory operations John Roderick ten Bosch reported selling 1,417 shares of Class A Common Stock on August 10, 2026 at $92.86 per share. After this sale, he held 27,884 shares directly. The sale was executed pursuant to a Rule 10b5-1 trading plan adopted on March 6, 2026.

Insider Trade Summary 10b5-1

Net Seller: 1,417 shares

Net Sell 1 txn

Insider ten Bosch John Roderick

Role SVP of Laboratory Operations

Sold 1,417 shs ($132K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F1	1,417	$92.86	$132K

Holdings After Transaction: Class A Common Stock — 27,884 shares (Direct)

Footnotes (1)

1. F1. The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Key Figures

Shares sold: 1,417 shares Sale price per share: $92.86 per share Shares held after transaction: 27,884 shares +1 more

4 metrics

Shares sold 1,417 shares Class A Common Stock sold on August 10, 2026

Sale price per share $92.86 per share Price for the August 10, 2026 sale transaction

Shares held after transaction 27,884 shares Direct holdings after the reported sale

Rule 10b5-1 plan adoption date March 6, 2026 Date the trading plan governing this sale was adopted

Key Terms

Rule 10b5-1 trading plan, Class A Common Stock, Form 4

3 terms

Rule 10b5-1 trading plan regulatory

"The transactions were effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Class A Common Stock financial

"security_title is listed as Class A Common Stock for this sale"

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.

Form 4 regulatory

"The transactions reported on this Form 4 were effected pursuant"

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.

FAQ

What insider transaction did BillionToOne (BLLN) report in this Form 4?

BillionToOne reported that executive John Roderick ten Bosch sold 1,417 shares of Class A Common Stock on August 10, 2026 at a price of $92.86 per share in a planned transaction.

How many BillionToOne (BLLN) shares did the insider retain after the sale?

After the reported sale, John Roderick ten Bosch held 27,884 shares of BillionToOne Class A Common Stock directly, as disclosed in the Form 4, indicating his remaining ownership position following the August 10, 2026 transaction.

Was the BillionToOne (BLLN) insider sale under a Rule 10b5-1 plan?

Yes. The filing states the sale was effected under a Rule 10b5-1 trading plan adopted by John Roderick ten Bosch on March 6, 2026, indicating the transaction was pre-arranged rather than discretionary.

What role does the reporting person hold at BillionToOne (BLLN)?

The reporting person, John Roderick ten Bosch, serves as SVP of Laboratory Operations at BillionToOne, Inc., according to the Form 4, and is therefore a company officer subject to insider reporting requirements.

Is the BillionToOne (BLLN) insider transaction a purchase or a sale?

The reported transaction is a sale of Class A Common Stock. John Roderick ten Bosch disposed of 1,417 shares at $92.86 per share, and no purchases or option exercises are disclosed in this Form 4.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/12/2026 - 06:55 PM Accepted by SEC EDGAR 08/12/2026 - 06:55 PM Learn about SEC filing dates

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).

X

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^*

ten Bosch John Roderick

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP of Laboratory Operations

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026

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	08/10/2026		S(1)		1,417	D	$92.86	27,884	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 transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2026.

Remarks:

	/s/ Thomas P. Lynch, Attorney-in-Fact	08/12/2026
	** 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)