Form 4 Filing for Ecovyst Inc. - Insider Transaction

This filing details a transaction by Patti A. Humble, a director at Ecovyst Inc. (ECVT). On May 26, 2026, Ms. Humble acquired 9,099 shares of Common Stock at a price of $13.61 per share. Following this transaction, she directly owns 9,099 shares of Ecovyst Inc. Common Stock. The transaction was executed under transaction code "A", indicating an acquisition, and reported on Form 4. The filing was signed on May 27, 2026, by Joseph S. Koscinski as attorney-in-fact for Ms. Humble.