The CEO's $3.15M sale is notable in absolute terms but trivial relative to MKSI's $21.7B market cap. Without a 10b5-1 plan disclosure or a pattern of clustered selling, this is likely a routine diversification trade. Monitor for any subsequent Form 4 filings that might reveal a 10b5-1 plan or additional selling. The stock's strong analyst consensus (85% bullish) and the historical win rate on prior MKSI reports (71% at T+20) suggest the broader bullish narrative remains intact.
Price Chart
Executive Summary
Two MKSI insiders, including the CEO, sold a combined $3.56M in open-market sales over a 7-day window. The CEO's $3.15M sale is the dominant event, representing ~0.016% of the $21.7B market cap — a trivial proportion. The cluster is small relative to company size and lacks a clear catalyst, making it a routine liquidity event.
Key Financial Metrics
Key Facts
- CEO Lee John Tseng-Chung sold 10,000 shares at $315.48 for $3.15M on 2026-05-22
- Director Peter Cannone III sold 1,400 shares at $303.40 for $410K on 2026-05-18
- Total cluster value of $3.56M is ~0.016% of MKSI's $21.7B market cap
- Both sales were open-market (code S), not tax-withholding or derivative exercises
- No 10b5-1 plan information provided, but the CEO's sale is a single large transaction, not a recurring pattern
Financial Impact
Total insider sales of $3.56M, representing ~0.016% of market cap — immaterial relative to company size
Risk Factors
- CEO selling could be perceived negatively by the market if it precedes a negative catalyst, though no such catalyst is evident
- If additional insider sales emerge in the coming weeks, the cluster could become more material
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-1779819379679 |
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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