MKS INC 4

EVP & GM, PSD John Edward Williams sold 457 shares of MKS INC common stock at $288.31 per share under a Rule 10b5-1 plan.

On 2026-08-03, John Edward Williams, EVP & GM, PSD of MKS INC, sold 457 shares of the company’s common stock at an average price of $288.31 per share under a pre-established Rule 10b5-1 trading plan, for total proceeds of approximately $131,720. After this sale, he directly beneficially owned about 4,097.844 shares of MKS INC common stock, implying a post-transaction holding value of roughly $1.18 million based on the reported sale price.

Filing Facts

CIK

1049502

Ticker

MKSI

Form

4

Source Type

sec

Accession

0001049502-26-000111

Alert Tier

5