Burke Kathleen Flaherty 4

What Happened
Kathleen Burke Flaherty, EVP, General Counsel & Secretary of MKS Inc. (MKSI), sold 4,355 shares on May 11, 2026 in an open-market/private sale. The filing reports a weighted average sale price of $319.94 per share for total proceeds of approximately $1,393,317. This was a sale (not a purchase or option exercise), which is commonly a routine liquidity event rather than a direct signal of sentiment.

Key Details

• Transaction date: 2026-05-11 (reported on Form 4 filed 2026-05-12). Filing appears timely (within the typical 2-business-day rule).
• Reported price: weighted average $319.94; trades executed in multiple fills at prices ranging $319.715 to $320.670 (see footnote).
• Shares sold: 4,355; proceeds ≈ $1,393,317.
• Shares owned after transaction: not specified in the provided filing.
• Footnote: reporting person can provide full per-trade share counts and prices upon request (multiple trades produced the weighted average).
• No 10b5-1 plan, tax withholding, gift, or exercise notation was disclosed in this Form 4.

Context
Open-market sales by officers are common for diversification or personal liquidity and do not by themselves indicate company performance or insider conviction. Because the filing does not state any planned sale program or special circumstances, treat this as a routine insider sale unless further disclosures (e.g., a 10b5-1 plan) appear in subsequent filings.