STOCK TITAN

BillionToOne (BLLN) officer sells 801 shares in Rule 10b5-1 plan

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

Rhea-AI Filing Summary

BillionToOne, Inc. officer Nancy JoAnn Johnson reported an open-market sale of 801 shares of Class A Common Stock at a weighted average price of $124.9137 per share. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on March 6, 2026, indicating it was scheduled in advance. Following this transaction, she directly holds 21,099 shares, so the sale represents a small portion of her reported stake.

Positive

  • None.

Negative

  • None.
Insider Johnson Nancy JoAnn
Role See Remarks
Sold 801 shs ($100K)
Type Security Shares Price Value
Sale Class A Common Stock 801 $124.9137 $100K
Holdings After Transaction: Class A Common Stock — 21,099 shares (Direct, null)
Footnotes (1)
  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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.900 to $124.940 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
Shares sold 801 shares Open-market sale on July 1, 2026
Weighted average sale price $124.9137 per share Class A Common Stock sale
Post-transaction holdings 21,099 shares Direct ownership after sale
Sale price range $124.900–$124.940 per share Multiple transactions within this range
Net share change -801 shares Net-sell direction for this Form 4
Rule 10b5-1 trading plan regulatory
"transactions reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"
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.
weighted average price financial
"The reported price in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
open-market sale financial
"transaction_action: 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: 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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FAQ

What did BillionToOne (BLLN) officer Nancy JoAnn Johnson report in this Form 4?

Nancy JoAnn Johnson reported selling 801 shares of BillionToOne Class A Common Stock in an open-market transaction. The filing shows this was a planned sale under a Rule 10b5-1 trading plan, with remaining direct holdings of 21,099 shares after the trade.

At what price were the 801 BillionToOne (BLLN) shares sold?

The 801 shares were sold at a weighted average price of $124.9137 per share. Footnotes state the individual trades occurred in a price range from $124.900 to $124.940 per share, and detailed breakdowns are available upon written request.

How many BillionToOne (BLLN) shares does Nancy JoAnn Johnson hold after this sale?

After selling 801 shares, Nancy JoAnn Johnson directly holds 21,099 shares of BillionToOne Class A Common Stock. This indicates the transaction covered only a small fraction of her disclosed direct holdings, suggesting it was a limited liquidity event rather than a large position change.

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

Yes. A footnote explains the transactions were effected under a Rule 10b5-1 trading plan adopted on March 6, 2026. Such plans pre-schedule trades, meaning the timing reflects the plan’s terms rather than a new discretionary trading decision.

What does the weighted average price disclosure mean in this BillionToOne (BLLN) Form 4?

The Form 4 states the reported price is a weighted average because the 801 shares were sold in multiple trades between $124.900 and $124.940 per share. The reporting person offers to provide exact share counts at each price upon written request.
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*
Johnson Nancy JoAnn

(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)
See Remarks
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026
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 Stock07/01/2026S(1)801D$124.9137(2)21,099D
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.
2. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.900 to $124.940 per share, inclusive. The holder undertakes to provide, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
Remarks:
Senior Vice President of Sales and Commercial Operations
/s/ Thomas P. Lynch, Attorney-in-Fact07/06/2026
** 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)