BillionToOne (BLLN) CPO sells 8,000 shares and exercises options in pre-set plan
Filing Impact
Filing Sentiment
Form Type
4
Rhea-AI Filing Summary
BillionToOne, Inc. Chief Product Officer Shan Riku Sakakibara reported open‑market sales of Class A Common Stock totaling 8,000 shares at $125.00 per share on July 9, 2026. On the same date, Sakakibara exercised stock options for 4,000 shares of Class A Common Stock at exercise prices of $30.78 and $8.65 per share. The company notes these trades were effected under a Rule 10b5‑1 trading plan and that the options exercised were fully vested and exercisable.
Positive
- None.
Negative
- None.
Insights
Analyzing...
Insider Trade Summary 10b5-1
Net Seller: 8,000 shares ($1,000,000)
Net Sell
13 txns
Insider
Sakakibara Shan Riku
Role
Chief Product Officer
Sold
8,000 shs ($1.00M)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option (right to buy) | 174 | $8.65 | $2K |
| Exercise | Stock Option (right to buy) | 1,117 | $30.78 | $34K |
| Exercise | Stock Option (right to buy) | 1,355 | $30.78 | $42K |
| Exercise | Stock Option (right to buy) | 1,354 | $30.78 | $42K |
| Exercise | Class A Common Stock | 174 | $8.65 | $2K |
| Exercise | Class A Common Stock | 1,117 | $30.78 | $34K |
| Exercise | Class A Common Stock | 1,355 | $30.78 | $42K |
| Exercise | Class A Common Stock | 1,354 | $30.78 | $42K |
| Sale | Class A Common Stock | 4,000 | $125.00 | $500K |
| Sale | Class A Common Stock | 174 | $125.00 | $22K |
| Sale | Class A Common Stock | 1,117 | $125.00 | $140K |
| Sale | Class A Common Stock | 1,355 | $125.00 | $169K |
| Sale | Class A Common Stock | 1,354 | $125.00 | $169K |
Holdings After Transaction:
Stock Option (right to buy) — 35,826 shares (Direct);
Class A Common Stock — 208,174 shares (Direct)
Footnotes (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 options are fully vested and exercisable. The terms of the underlying option grant are as previously reported on the Reporting Person's Form 3 filed on November 5, 2025.
Key Figures
Shares sold: 8,000 shares
Sale price: $125.00 per share
Options exercised: 4,000 shares
+4 more
7 metrics
Shares sold
8,000 shares
Total Class A Common Stock sold in open-market transactions on July 9, 2026
Sale price
$125.00 per share
Price for each reported Class A Common Stock sale transaction
Options exercised
4,000 shares
Total Class A shares underlying options exercised on July 9, 2026
Option exercise price
$30.78 per share
Exercise price for several Stock Option (right to buy) tranches
Lower exercise price
$8.65 per share
Exercise price for one Stock Option (right to buy) tranche
Exercise transactions
4 exercises
Number of derivative exercises (M code) reported in transaction summary
Net share change (buy/sell)
-8,000 shares
Net buy/sell shares across reported non-derivative transactions
Key Terms
Rule 10b5-1 trading plan, Stock Option (right to buy), derivative security, fully vested and exercisable
4 terms
Rule 10b5-1 trading plan regulatory
"The transactions reported ... 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.
Stock Option (right to buy) financial
"security_title: Stock Option (right to buy) ... underlying security: Class A"
derivative security financial
"transaction_code_description: Exercise or conversion of derivative security"
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
fully vested and exercisable financial
"The options are fully vested and exercisable. The terms of the underlying"
FAQ
What insider transactions did BLLN’s Chief Product Officer report on July 9, 2026?
The Chief Product Officer reported selling 8,000 Class A shares at $125.00 and exercising options for 4,000 shares at $30.78 and $8.65 per share, all on July 9, 2026.
Were the BLLN insider stock sales by Shan Riku Sakakibara pre-planned?
Yes. The filing states the transactions were effected under a Rule 10b5‑1 trading plan adopted on March 6, 2026, indicating the trades were pre‑scheduled rather than discretionary market‑timing decisions.
What stock options did the BLLN insider exercise in this Form 4?
The insider exercised options covering 4,000 shares of Class A Common Stock, including tranches at a $30.78 exercise price and a tranche at $8.65 per share. The filing notes these options were fully vested and exercisable.
What does the Rule 10b5-1 plan mean for these BLLN insider trades?
The filing explains the trades occurred under a Rule 10b5‑1 trading plan, meaning quantities and timing were set in advance on March 6, 2026, reducing the significance of short‑term market conditions in interpreting these transactions.