This insider sell cluster is too small relative to MKSI's $22.2B market cap to be actionable on its own. Monitor next quarterly filing for any guidance revision or segment trends, but the sell pattern (tight window, similar prices for CEO/CFO) suggests pre-planned diversification rather than informed bearish view. The cross-filing amplifiers in the calibration data do not override the proportionality floor.
Price Chart
Executive Summary
Five MKSI insiders sold $7.60M in open-market shares over a 7-day window, including the CEO ($3.15M) and CFO ($2.78M). At $22.2B market cap, the cluster represents only ~0.034% of market cap, which is trivial by proportionality standards. Insider sells are weak predictors per academic literature, and CEO/CFO sales at similar prices on the same date (May 22) may share a vesting or 10b5-1 catalyst — not necessarily a bearish signal.
Key Financial Metrics
Key Facts
- 5 insiders sold open-market shares totaling $7.60M from May 22-27, 2026
- CEO John Lee sold 10,000 shares at $315.48 for $3.15M
- CFO Ramakumar Mayampurath sold 8,810 shares at $315.48 for $2.78M
- All trades were open-market sales (code S) — no option exercises or tax-withholding events
- Total cluster value is ~0.034% of $22.2B market cap — well below 0.1% trivial threshold
- Recent 30d insider activity: 8 prior sells totaling $8.8M — this cluster continues a routine selling pattern
- 85% of analysts rate MKSI as Strong Buy/Buy — no fundamental red flags
Financial Impact
Total insider sales of $7.60M, representing 0.034% of market cap — trivial relative to company size
Risk Factors
- CEO and CFO both selling on same date (May 22) could indicate coordinated 10b5-1 plan — still carries no near-term signal
- Insider selling pace ($16.4M over 30 days including this cluster) may accelerate if stock continues to rally
- Historical calibration shows score=2/3 filings on MKSI have poor T+20 predictive power — this cluster is unlikely to be an exception
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-MKSI-1779991701602 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 1, 2026 4w ago | 144 | $246.44 $265.36 | ▲ +7.68% | ▲ +7.36% | $282.86 (+14.78%) |
Jul 13, 2026 11w ago | Press Release | $352.03 $290.59 | ▼ −17.45% | ▼ −20.64% | $282.86 (−19.65%) |
Jun 8, 2026 16w ago | Insider Cluster | $312.09 $368.06 | ▲ +17.93% | ▲ +16.30% | $282.86 (−9.37%) |
Jun 2, 2026 17w ago | Insider Cluster | $329.66 $411.05 | ▲ +24.69% | ▲ +26.51% | $282.86 (−14.20%) |
Jun 2, 2026 17w ago | Insider Cluster | $329.66 $411.05 | ▲ +24.69% | ▲ +26.51% | $282.86 (−14.20%) |
May 28, 2026 18w ago | Insider Cluster | $323.41 $410.31 | ▲ +26.87% | ▲ +29.56% | $282.86 (−12.54%) |
May 28, 2026 18w ago | Insider Cluster | $323.41 $410.31 | ▲ +26.87% | ▲ +29.56% | $282.86 (−12.54%) |
May 26, 2026 18w ago | Insider Cluster | $332.43 $389.17 | ▲ +17.07% | ▲ +19.33% | $282.86 (−14.91%) |
May 26, 2026 18w ago | Insider Cluster | $332.43 $389.17 | ▲ +17.07% | ▲ +19.33% | $282.86 (−14.91%) |
May 19, 2026 19w ago | Insider Cluster | $293.92 $366.31 | ▲ +24.63% | ▲ +22.37% | $282.86 (−3.76%) |
US Market Status
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