Burke Kathleen Flaherty 4

What Happened Kathleen Burke Flaherty, EVP, General Counsel & Secretary of MKS Inc (MKSI), received a grant of 7,008.628 restricted stock units (RSUs) on February 8, 2026. The grant is reported as an award (transaction code A) and no per-share price or cash value is listed (N/A) because these are equity awards, not an open-market purchase or sale.

Key Details

• Transaction date: February 8, 2026 (reported on Form 4 filed Feb 9, 2026). Filing appears timely.
• Award: 7,008.628 RSUs; price: N/A (equity award).
• Shares owned after transaction: not specified in the filing.
• Footnotes: Each RSU represents the contingent right to receive one share of MKS common stock (F1). The RSUs were performance-based; the performance criteria were determined satisfied on Feb 8, 2026, and the RSUs will vest in three equal annual installments beginning Feb 15, 2026 (or the next business day if Feb 15 is not a business day) (F2).
• Transaction type: Derivative grant of RSUs (not an immediate share transfer or sale).

Context RSUs are a form of compensation that convert into actual shares only upon vesting and are commonly used to retain executives. Because these were performance-based RSUs that have now met their performance condition, vesting will occur over the next three years—this is not an immediate sale or purchase and does not by itself indicate buying or selling activity in the open market.