Schreiner James Alan 4

What Happened

• James A. Schreiner, EVP & COO of MKS Inc (MKSI), received a grant of 5,226.759 restricted stock units (RSUs) on February 8, 2026. These RSUs are derivative awards (no cash purchase price reported) that represent the contingent right to receive one share of MKS common stock per RSU upon vesting.

Key Details

• Transaction date: February 8, 2026; Transaction code: A (award/grant).
• Shares/units granted: 5,226.759 RSUs. Price: N/A (award/derivative).
• Shares owned after transaction: not reported in the filing.
• Footnote F1: Each RSU equals the contingent right to one share of MKS common stock.
• Footnote F2: The RSUs were subject to performance criteria (achievement determined on Feb 8, 2026) and will vest in three equal annual installments beginning on Feb 15, 2026 (if Feb 15 is not a business day, vesting occurs the next business day).
• Filing date: Form 4 filed Feb 9, 2026 (one day after the transaction).

Context

• These RSUs are compensation-based awards, not open-market purchases or sales; they become actual shares only if and when the performance conditions are met and the RSUs vest. Such grants are common for executive compensation and do not by themselves indicate insider buying or selling in the open market.