The CEO, CIO, GC, CRO, and CISO all sold shares on the same day in a coordinated exercise-and-sell pattern. While the total is modest relative to market cap, the breadth of C-suite participation is unusual and signals potential concern about near-term valuation. Monitor upcoming earnings or material announcements for context. The historical cluster calibration shows this combination (cluster-sales + nearby earnings/agreement filings) has been an amplifier historically, increasing the signal strength.
Price Chart
Executive Summary
CEO Thomas Gallagher, EVP/CRO Deitzel, EVP/GC Comly, EVP/CIO Schafer, EVP/CISO Jayabalan, and two directors sold a total of ~$8.0M worth of MIAX stock on August 4, 2026. The sales coincided with large-scale option exercises at $0–$12 strike prices, indicating a cashless exercise-and-sell pattern. No open-market purchases were reported. At a $4.3B market cap, the total open-market sales represent ~0.19% of market cap — a modest but notable cluster involving virtually the entire C-suite.
Key Financial Metrics
Key Facts
- Chairman & CEO Thomas P. Gallagher sold 48,334 shares for ~$2.21M on August 4, 2026.
- EVP & CIO Douglas M. Schafer Jr. sold 48,000 shares for ~$2.19M on August 4, 2026.
- EVP, GC & Corporate Secretary Barbara J. Comly sold 44,445 shares for ~$2.03M on August 4, 2026.
- EVP, CISO and CRO Harish Jayabalan sold 20,000 shares for $918K on August 4, 2026.
- EVP, CRO, CCO MIAX Exchanges Edward Deitzel sold 11,000 shares for ~$504K on August 4, 2026.
- Director Judson Gray Teekell sold 3,000 shares for $137K on August 4, 2026.
- Director Kurt M. Eckert sold 1,063 shares for ~$49K on August 4, 2026.
- Total insider open-market sales: ~$8.0M (0.19% of $4.3B market cap).
- All open-market sales were preceded by option exercises at $0–$12 per share, indicating a cashless exercise-and-sell strategy.
- No open-market purchases were reported by any insider in this cluster.
Financial Impact
$8.0 million in insider open-market sales, representing 0.19% of $4.3 billion market cap.
Risk Factors
- Broad-based C-suite selling may indicate undisclosed headwinds or a peak-in-valuation view by management.
- Option exercises followed by immediate sales dilute existing shareholders and suggest insiders are monetizing equity rather than holding.
- No insider buying to offset the selling increases concern about insider conviction.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-MIAX-1786082825629 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 today | Insider Cluster | $33.16 | awaiting T+1 | — | $32.42 (−2.22%) |
Oct 1, 2026 26d ago | Press Release | $33.75 $33.01 | ▼ −2.19% | ▼ −2.93% | $32.42 (−3.93%) |
Sep 4, 2026 7w ago | Insider Cluster | $43.46 $42.89 | ▼ −1.31% | ▼ −0.85% | $32.42 (−25.39%) |
Sep 4, 2026 7w ago | Insider Cluster | $43.46 $42.89 | ▼ −1.31% | ▼ −0.85% | $32.42 (−25.39%) |
Aug 19, 2026 9w ago | Insider Cluster | $41.32 $42.59 | ▲ +3.07% | ▲ +2.66% | $32.42 (−21.53%) |
Aug 19, 2026 9w ago | Insider Cluster | $41.32 $42.59 | ▼ −3.07% | ▼ −2.66% | $32.42 (+21.53%) |
Aug 6, 2026 11w ago | Insider Cluster | $44.23 $43.59 | ▲ +1.45% | ▲ +1.42% | $32.42 (+26.69%) |
Jul 16, 2026 14w ago | Insider Cluster | $42.33 $42.04 | ▼ −0.69% | ▼ −0.52% | $32.42 (−23.40%) |
Jul 14, 2026 14w ago | Insider Cluster | $42.43 $42.89 | ▲ +1.08% | ▲ +1.63% | $32.42 (−23.58%) |
Jul 7, 2026 15w ago | Insider Cluster | $41.86 $42.99 | ▲ +2.70% | ▲ +1.85% | $32.42 (−22.54%) |
US Market Status
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