BillionToOne SVP sells 1,416 shares at $97.54

BillionToOne SVP of Laboratory Operations reports a pre-planned sale of 1,416 BLLN shares under a Rule 10b5-1 trading plan.

Rhea-AI Filing Summary

BillionToOne, Inc. (BLLN) reported that John Roderick ten Bosch, its SVP of Laboratory Operations, sold 1,416 shares$97.54 per share25,051 shares

The filing states that this transaction was effected pursuant to a Rule 10b5-1 trading plan adopted on June 2, 2026

Insider Trade Summary 10b5-1

Net Seller: 1,416 shares

Net Sell 1 txn

Insider ten Bosch John Roderick

Role SVP of Laboratory Operations

Sold 1,416 shs ($138K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F1	1,416	$97.54	$138K

Holdings After Transaction: Class A Common Stock — 25,051 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 June 2, 2026.

Key Figures

Shares sold: 1,416 shares Sale price per share: $97.54 per share Shares held after transaction: 25,051 shares +2 more

5 metrics

Shares sold 1,416 shares Class A Common Stock sale on September 9, 2026

Sale price per share $97.54 per share Class A Common Stock sale on September 9, 2026

Shares held after transaction 25,051 shares Direct holdings of John Roderick ten Bosch after the sale

Rule 10b5-1 plan adoption date June 2, 2026 Trading plan governing the reported sale

Net shares sold in this Form 4 1,416 shares Net selling activity reported in the transaction summary

Key Terms

Rule 10b5-1 trading plan, Class A Common Stock, open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

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

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"

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.

open market or private transaction financial

"described as a Sale in open market or private transaction"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did BLLN report for John Roderick ten Bosch?

BillionToOne reported that John Roderick ten Bosch sold 1,416 shares$97.54 per share25,051 shares

Was the recent BLLN insider sale made under a Rule 10b5-1 plan?

Yes. The Form 4 states that the transactions were effected pursuant to a Rule 10b5-1 trading planJune 2, 2026

How many BLLN shares does the SVP of Laboratory Operations hold after the sale?

After the reported sale, John Roderick ten Bosch directly holds 25,051 shares

What price did the BLLN insider receive per share in the September 9, 2026 sale?

The Form 4 reports a sale price of $97.54 per share1,416 shares

What is the role of the insider who sold BLLN shares?

The reporting person, John Roderick ten Bosch, is identified as SVP of Laboratory Operations1,416 shares

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

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Available on EDGAR 09/11/2026 - 06:01 PM Accepted by SEC EDGAR 09/11/2026 - 06:01 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)
09/09/2026

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	09/09/2026		S(1)		1,416	D	$97.54	25,051	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 June 2, 2026.

Remarks:

	/s/ Thomas P. Lynch, Attorney-in-Fact	09/11/2026
	** 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)