BillionToOne, Inc. (BLLN) SVP sells 4,251 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

BillionToOne, Inc. executive ten Bosch John Roderick, SVP of Laboratory Operations, executed pre-arranged open-market sales of 4,251 shares of Class A Common Stock at $125.4600 per share on July 13, 2026, under a Rule 10b5-1 trading plan adopted on March 6, 2026.

Insider Trade Summary 10b5-1

Net Seller: 4,251 shares ($533,330)

Net Sell 3 txns

Insider ten Bosch John Roderick

Role SVP of Laboratory Operations

Sold 4,251 shs ($533K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	1,417	$125.46	$178K
Sale	Class A Common Stock	1,417	$125.46	$178K
Sale	Class A Common Stock	1,417	$125.46	$178K

Holdings After Transaction: Class A Common Stock — 32,135 shares (Direct)

Footnotes (1)

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Key Figures

Shares sold: 4251 shares Sale price per share: 125.4600 per share Number of sale transactions: 3 +1 more

4 metrics

Shares sold 4251 shares Total Class A Common Stock sold on 2026-07-13 by the reporting person

Sale price per share 125.4600 per share Price for each reported open-market sale transaction on 2026-07-13

Number of sale transactions 3 Count of separate open-market sale transactions reported

Net buy/sell shares -4251 Net share change from reported transactions, reflecting a net-sell direction

Key Terms

Rule 10b5-1 trading plan, open-market sale, Class A Common Stock

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.

open-market sale market

"transaction_action is described as an open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

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.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/15/2026 - 04:38 PM Accepted by SEC EDGAR 07/15/2026 - 04:38 PM Learn about SEC filing dates

FAQ

What insider transaction did BillionToOne (BLLN) report on July 13, 2026?

BillionToOne reported that SVP ten Bosch John Roderick sold 4,251 shares of Class A Common Stock in open-market transactions at $125.4600 per share on July 13, 2026, all under a pre-arranged Rule 10b5-1 trading plan.

Who is ten Bosch John Roderick at BillionToOne (BLLN)?

ten Bosch John Roderick is BillionToOne’s SVP of Laboratory Operations. He reported open-market sales totaling 4,251 shares of Class A Common Stock on July 13, 2026, executed under a Rule 10b5-1 trading plan.

Were the BLLN insider share sales made under a Rule 10b5-1 plan?

Yes. The reported sales were effected pursuant to a Rule 10b5-1 trading plan adopted by ten Bosch John Roderick on March 6, 2026, indicating the trades were pre-arranged rather than discretionary on the trade date.

What type of security did the BillionToOne (BLLN) insider sell?

The insider sold Class A Common Stock of BillionToOne, Inc. All three transactions involved non-derivative shares rather than options or other derivatives, and were executed as open-market sales on July 13, 2026.

How many separate transactions were reported in this BLLN insider sale?

The disclosure lists three separate open-market sale transactions. Each involved 1,417 shares of Class A Common Stock at a price of $125.4600 per share, together totaling 4,251 shares sold on July 13, 2026.

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)
07/13/2026

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	07/13/2026		S(1)		1,417	D	$125.46	32,135	D
Class A Common Stock	07/13/2026		S(1)		1,417	D	$125.46	30,718	D
Class A Common Stock	07/13/2026		S(1)		1,417	D	$125.46	29,301	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	07/15/2026
	** 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)