MKS INC 4

Renee Martel Donlan (EVP, GC & CCO of MKS Inc.) received an award of 954.044 restricted stock units that will vest over three years, increasing her direct beneficial ownership to 4,780.571 shares.

On August 17, 2026, Renee Martel Donlan, EVP, General Counsel & Chief Compliance Officer of MKS Inc., received an equity compensation grant of 954.044 restricted stock units, each representing the right to receive one share of MKS Inc. common stock. The RSUs were awarded at no cash cost and will vest in three equal annual installments beginning August 17, 2027 (or the next business day in each vesting year), subject to continued service. Following this award, Donlan beneficially owns 4,780.571 shares of MKS Inc. common stock on a direct basis, reflecting the addition of this new RSU grant.

Filing Facts

CIK

1049502

Ticker

MKSI

Form

4

Source Type

sec

Accession

0001049502-26-000115

Alert Tier

5