Monitor for any lockup expiration or 10b5-1 plan disclosure that would explain the coordinated sale. Given the historical pattern of bearish calls on SION being wrong, this cluster is unlikely to signal material downside. Watch for any insider buying in the coming weeks to gauge conviction.
Price Chart
Executive Summary
Two Sionna Therapeutics directors (OrbiMed Advisors LLC and Peter A. Thompson) each sold 115,844 shares at $45.50 on June 30, 2026, totaling $10.54M (0.55% of market cap). The identical timing and amounts suggest a coordinated exit, possibly related to a lockup expiration or planned selling program, rather than opportunistic insider selling. Historical bearish calls on SION have been consistently wrong, reducing the signal value of this cluster.
Key Financial Metrics
Key Facts
- Two directors sold identical amounts (115,844 shares each) on the same day at $45.50/share.
- Total insider selling of $10.54M represents 0.55% of SION's $1.9B market cap.
- Neither C-suite executive participated in the selling; all sellers are directors.
- Recent bearish calls on SION (4 of 4 in the past 3 months) have been incorrect, with the stock rising after each.
Financial Impact
Two directors sold $10.54M combined, representing 0.55% of market cap.
Risk Factors
- Potential insider pessimism if selling is not part of a pre-arranged plan.
- Further selling by remaining insiders could pressure the stock.
- Historical bearish calls on SION have been incorrect, so this cluster may be a false signal.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-SION-1783060148323 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 10, 2026 7w ago | 8-K | $4.50 $7.30 | ▼ −62.22% | ▼ −63.14% | $5.04 (−12.00%) |
Aug 6, 2026 8w ago | 8-K | $49.61 $6.75 | ▼ −86.39% | ▼ −86.99% | $5.04 (−89.84%) |
Jul 9, 2026 12w ago | Insider Cluster | $45.29 $51.04 | ▲ +12.70% | ▲ +10.27% | $5.04 (−88.87%) |
Jul 9, 2026 12w ago | Insider Cluster | $45.29 $51.04 | ▼ −12.70% | ▼ −10.27% | $5.04 (+88.87%) |
Jul 7, 2026 12w ago | Insider Cluster | $44.00 $47.34 | ▼ −7.59% | ▼ −4.32% | $5.04 (+88.55%) |
Jul 2, 2026 13w ago | Insider Cluster | $43.99 $46.78 | ▲ +6.34% | ▲ +6.76% | $5.04 (−88.54%) |
Jun 11, 2026 16w ago | Institutional Cluster | $36.05 $44.94 | ▲ +24.66% | ▲ +22.77% | $5.04 (−86.02%) |
May 30, 2026 17w ago | Insider Cluster | $40.90 $43.99 | ▲ +7.55% | ▲ +8.85% | $5.04 (−87.68%) |
May 29, 2026 17w ago | 144 | $40.90 $43.99 | ▼ −7.55% | ▼ −8.85% | $5.04 (+87.68%) |
May 12, 2026 20w ago | 8-K | $40.94 $34.03 | ▼ −16.88% | ▼ −15.15% | $5.04 (−87.69%) |
US Market Status
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