BillionToOne insider plans $1M stock sale
Rhea-AI Filing Summary
BillionToOne, Inc. (BLLN) is the issuer of Class A common stock subject to a planned resale under Rule 144 by account holder David Tsao. The notice covers a proposed sale of 10,000 Class A shares through Fidelity Brokerage Services LLC, with an indicated aggregate value of $1,000,000.00 and reference to 42,644,388 shares outstanding as of August 25, 2026.
The shares are to be sold following a stock option exercise for cash scheduled for August 25, 2026. The notice also lists sales in the past three months by David Tsao and the DT 2021 Irrevocable Trust, for which Icontrust LLC acts as trustee and in which Tsao is an account stakeholder. The notice is signed by Emily Navaro as attorney-in-fact for David Tsao.
Positive
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Negative
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Key Figures
Shares to be sold: 10,000 Class A shares
Aggregate value of shares to be sold: $1,000,000.00
Shares outstanding: 42,644,388 shares
+5 more
8 metrics
Shares to be sold
10,000 Class A shares
Proposed Rule 144 sale for the account of David Tsao
Aggregate value of shares to be sold
$1,000,000.00
Value associated with 10,000 Class A shares in the proposed sale
Shares outstanding
42,644,388 shares
Class A shares outstanding as of August 25, 2026
Prior sale June 15, 2026 (Tsao)
20,000 shares for $2,045,326.00
Class A sale by David Tsao
Prior sale July 13, 2026 (Tsao)
20,000 shares for $2,497,697.77
Class A sale by David Tsao
Prior sale August 10, 2026 (Tsao)
10,000 shares for $928,600.00
Class A sale by David Tsao
Trust sale June 15, 2026
3,500 shares for $355,145.00
Class A sale by DT 2021 Irrevocable Trust
Trust sale July 13, 2026
3,500 shares for $439,110.00
Class A sale by DT 2021 Irrevocable Trust
Key Terms
Rule 144, Stock Option Exercise, Irrevocable Trust, attorney-in-fact, +1 more
5 terms
Rule 144 regulatory
"See the definition of "person" in paragraph (a) of Rule 144."
Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.
Stock Option Exercise financial
"Class A | 08/25/2026 | Stock Option Exercise | Issuer |"
A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.
Irrevocable Trust financial
"Dt 2021 Irrevocable Trust 1035 O'Brien Drive Menlo Park CA 94025"
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.
attorney-in-fact regulatory
"as attorney-in-fact for David Tsao."
An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.
aggregate with sales regulatory
"sales are required by paragraph (e) of Rule 144 to be aggregated"
FAQ
What transaction is being reported for BLLN in this Form 144 notice?
The notice reports a proposed sale of 10,000 Class A shares of BillionToOne, Inc. common stock under Rule 144 for the account of David Tsao, to be executed through Fidelity Brokerage Services LLC after a stock option exercise for cash on August 25, 2026.
What prior sales in BLLN stock are disclosed for David Tsao in the last 3 months?
Disclosed prior sales by David Tsao include 20,000 Class A shares on June 15, 2026 for $2,045,326.00, 20,000 shares on July 13, 2026 for $2,497,697.77, and 10,000 shares on August 10, 2026 for $928,600.00.
What BLLN sales are reported for the DT 2021 Irrevocable Trust?
The DT 2021 Irrevocable Trust is shown selling 3,500 Class A shares on June 15, 2026 for $355,145.00, 3,500 shares on July 13, 2026 for $439,110.00, and 3,500 shares on August 10, 2026 for $325,010.00, with Icontrust LLC as trustee.
Who is executing the proposed BLLN sale and who signed the notice?
The proposed sale of 10,000 Class A shares is to be executed through Fidelity Brokerage Services LLC. The notice is signed by /s/ Emily Navaro as a duly authorized representative of Fidelity Brokerage Services LLC, acting as attorney-in-fact for David Tsao.
AI-generated analysis. How Rhea-AI works. Not financial advice.
