Insider selling is routine in size and pattern — likely tied to share settlement on equity awards after a strong earnings print. No bearish signal. Monitor for any Form 4 filings indicating insider buys, which would be more informative given the cluster-buy asymmetry literature. The fundamental story (strong demand from AI/semiconductor, leverage reduction via $100M voluntary prepay in May) remains intact.
Price Chart
Executive Summary
Four MKSI insiders (EVP & GM, EVP/GC, and two directors) sold $3.03M in open-market sales over a week ending May 18. The cluster follows the company's strong Q1 earnings beat and raised Q2 guidance on May 6. While the aggregate dollar amount is modest relative to MKSI's $20B market cap (~0.015%), the trades cluster heavily in the two EVPs on the same day (May 11) at nearly identical prices — suggesting coordinated selling around vesting or a 10b5-1 plan. The cross-filing amplifier for cluster-insider-trades + cluster-earnings-context fires (PMI 2.50, q=0.000), supporting a modestly elevated impact, but the asymmetry rule for sells applies: cluster sells are not amplified beyond proportionality. The $-amount is well below the 0.1%-of-market-cap threshold, making this routine.
Key Financial Metrics
Key Facts
- Total insider sales of $3.03M (~0.015% of $20B market cap) — well below the 0.1% materiality threshold
- Two EVPs sold $2.3M (76% of total) on the exact same day (May 11) at near-identical prices ($319.93-$319.94), consistent with vesting/10b5-1 plan
- Two directors sold $722K total in smaller lots on May 14 and May 18 — likely diversification
- Cluster follows a strong Q1 2026 earnings report (revenue +15% YoY to $1.078B, Non-GAAP EPS $2.30 vs $1.71 YoY) and above-consensus Q2 guidance ($1.2B midpoint)
- Cross-filing amplifiers for insider-sells post-earnings are statistically significant, but the dollar amount is too small to justify a bearish rating
Financial Impact
Total insider sales of $3.03M represent 0.015% of market cap — de minimis. No material economic impact.
Risk Factors
- Multiple insiders selling at stock highs could signal peak-valuation thinking, but dollar amounts are too small to draw that conclusion
- Convertible note conversion feature triggered (stock-price condition met) — $1.4B face could dilute if converted, though offset by $100M prepay and cash balance of $569M
- Guidance incorporates tariff impacts — escalation beyond current assumptions could pressure second-half results
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-1779202021168 |
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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