The absence of 10b5-1 plan designations and the involvement of the CTO elevate the signal. Monitor for any forthcoming 8-K or earnings pre-announcement that could explain the coordinated selling. If the stock continues to trade near $125, further insider selling would reinforce the bearish read.
Price Chart
Executive Summary
Three insiders at BillionToOne, Inc. (BLLN) sold a total of $1.23M in stock over a one-week window, including the CTO and SVP of Laboratory Operations. The sales are open-market transactions without any 10b5-1 plan indication, representing approximately 0.38% of the company's $326M market cap — a modest but notable cluster. The timing, just after a prior bearish report on the stock, suggests insiders may be taking advantage of recent price strength or reacting to internal headwinds.
Key Financial Metrics
Key Facts
- Three insiders sold a total of $1.23M in open-market transactions from Sep 17-24, 2026.
- CTO David Tsao sold 3,300 shares at $125.00 for $417K.
- SVP of Laboratory Operations John Roderick ten Bosch sold 1,400 shares at $120.00 for $170K.
- Lynch Thomas P. sold 5,800 shares at $110.29 for $644K.
- No 10b5-1 trading plan was indicated for any of the sales.
- Total sales represent approximately 0.38% of the company's $326M market cap.
Financial Impact
Insider sales of $1.23M represent 0.38% of market cap — modest but above the routine threshold.
Risk Factors
- Sales could be pre-planned under a 10b5-1 plan not disclosed in the Form 4 footnotes.
- Insider selling at a company with a prior bearish report may already be partially discounted by the market.
- The cluster size is modest relative to market cap, limiting the magnitude of any potential downside.
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-BLLN-1790632776512 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 30, 2026 25d ago | Insider Cluster | $105.76 | awaiting T+60 | — | $111.46 (−5.39%) |
Sep 28, 2026 27d ago | Insider Cluster | $118.18 | awaiting T+60 | — | $111.46 (+5.68%) |
Sep 23, 2026 4w ago | Insider Cluster | $124.90 | awaiting T+60 | — | $111.46 (+10.76%) |
Sep 22, 2026 4w ago | Institutional Cluster | $116.07 | awaiting T+60 | — | $111.46 (−3.97%) |
Sep 21, 2026 4w ago | Insider Cluster | $116.07 | awaiting T+60 | — | $111.46 (+3.97%) |
Sep 16, 2026 5w ago | Insider Cluster | $110.67 | awaiting T+60 | — | $111.46 (−0.72%) |
Sep 11, 2026 6w ago | Insider Cluster | $100.82 | awaiting T+60 | — | $111.46 (+10.56%) |
Sep 11, 2026 6w ago | Insider Cluster | $100.82 | awaiting T+60 | — | $111.46 (+10.56%) |
Aug 27, 2026 8w ago | Insider Cluster | $93.24 | awaiting T+60 | — | $111.46 (+19.55%) |
Aug 27, 2026 8w ago | Insider Cluster | $93.24 | awaiting T+60 | — | $111.46 (+19.55%) |
US Market Status
Subscribe to SecBot
Get Real-Time SEC Filing Intelligence
Comprehensive SEC filing analysis delivered the moment filings hit EDGAR. Sentiment scoring, impact analysis, and actionable insights for every material event.
Create a free account Live analysis, Telegram alerts, watchlists and the MCP server for subscribers