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  4. [Form 4] BillionToOne, Inc. Insider Trading Activity

BillionToOne SVP sells 1,417 shares at $100

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

BillionToOne, Inc. (BLLN) insider ten Bosch John Roderick, SVP of Laboratory Operations, reported selling 1,417 shares of Class A Common Stock on August 25, 2026 at $100.00 per share in an open market or private transaction. Following this sale, he directly holds 26,467 shares. The sale was effected under a Rule 10b5-1 trading plan adopted on March 6, 2026.

Positive

  • None.

Negative

  • None.
Insider ten Bosch John Roderick
Role SVP of Laboratory Operations
Sold 1,417 shs ($142K)
Type Security Shares Price Value
Sale Class A Common Stock F1 1,417 $100.00 $142K
Holdings After Transaction: Class A Common Stock — 26,467 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.
Shares sold 1,417 shares of Class A Common Stock Sale on August 25, 2026 reported on Form 4
Sale price per share $100.00 per share Price for the 1,417 shares sold on August 25, 2026
Shares owned after transaction 26,467 shares Direct holdings of ten Bosch John Roderick after the sale
Rule 10b5-1 plan adoption date March 6, 2026 Date the trading plan governing this sale was adopted
Rule 10b5-1 trading plan regulatory
"The transactions reported on this Form 4 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: 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
"transaction_code_description: Sale in open market or private transaction"

FAQ

What insider transaction did BLLN report in this Form 4?
BillionToOne, Inc. reported that SVP of Laboratory Operations ten Bosch John Roderick sold 1,417 shares of Class A Common Stock on August 25, 2026 at $100.00 per share in an open market or private transaction.

How many BLLN shares does the insider hold after this sale?
After the reported sale, ten Bosch John Roderick directly holds 26,467 shares of BillionToOne, Inc. Class A Common Stock, as stated in the Form 4 filing.

Was the 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 plan adopted by the reporting person on March 6, 2026, and the Rule 10b5-1 checkbox is marked as affirmed.

What role does the reporting person hold at BillionToOne, Inc. (BLLN)?
The reporting person, ten Bosch John Roderick, is identified as an officer of BillionToOne, Inc., serving as SVP of Laboratory Operations according to the Form 4.

How many BLLN shares were sold in this Form 4 transaction and at what price?
The Form 4 shows a sale of 1,417 shares of BillionToOne, Inc. Class A Common Stock at a price of $100.00 per share on August 25, 2026.

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SEC Form 4
FORM 4UNITED 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)
Director10% Owner
XOfficer (give title below)Other (specify below)
SVP of Laboratory Operations
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/25/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Class A Common Stock08/25/2026S(1)1,417D$10026,467D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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-Fact08/27/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR