Form 4: MKS Instruments COO Executes Stock Sale

EVP and COO James Alan Schreiner sold 3,500 shares of MKS Instruments common stock on June 12, 2026.

Summary

• James Alan Schreiner, EVP and COO of MKS Instruments, sold a total of 3,500 shares of common stock.
• The shares were sold in three separate transactions on June 12, 2026.
• The weighted average sale prices for the transactions were $345.5239, $346.4058, and $347.00 per share.
• Following these transactions, the reporting person retains beneficial ownership of 19,201.121 shares.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event, as it is a routine disclosure of an executive's personal financial transaction rather than a material change in company strategy or performance.

Positives

• The executive maintains a significant remaining equity stake of 19,201.121 shares in the company.

Negatives

• The sale represents a reduction in the direct equity holdings of a key member of the executive leadership team.

Risks

• Insider selling can sometimes be perceived by the market as a lack of confidence in future short-term performance, though it is often related to personal financial planning.

Future Outlook

No forward-looking guidance or strategic outlook was provided in this regulatory filing.

Industry Context

StockSavvy.ai notes that executive stock sales are common occurrences for liquidity or tax planning purposes and do not necessarily reflect a change in the company's fundamental business outlook or operational health.

Comparison to Industry Standards

• The sale of shares by an EVP/COO is a standard corporate governance event and is consistent with typical executive compensation and liquidity management practices observed in the semiconductor capital equipment sector.

Stakeholder Impact

• Minimal impact expected on shareholders as the transaction size is relatively small compared to the total market capitalization of the company.

Next Steps

• No future actions or milestones were disclosed in this filing.

Key Dates

Keywords

MKS Instruments, MKSI, Insider Trading, Form 4, Executive Stock Sale, Semiconductor Equipment