Ecovyst Inc.

Table of Contents ITEM 1. BUSINESS. Ecovyst Inc. (“Ecovyst” or the “Company”), formerly PQ Group Holdings Inc., was incorporated in Delaware on August 7, 2015. We trace our roots to the late 1800s with our first sulfuric acid plant and the beginning of our oldest customer relationship. Our common stock is listed on the New York Stock Exchange under the stock ticker “ECVT”. Unless the context otherwise indicates, the terms “Ecovyst Inc.,” “we,” “us,” “our,” or the “Company” mean Ecovyst Inc. and our subsidiaries. Effective on December 31, 2025, we completed the sale of our Advanced Materials & Catalysts segment, which includes our investment in affiliated companies, Zeolyst International and…

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Table of Contents ITEM 1A. RISK FACTORS. In addition to the other information contained in this Form 10-K, you should carefully consider the following risks that we believe are the material risks that we face. The risks described below could have a material adverse impact on our business, financial condition, cash flows and results of operations, and should be read together and in conjunction with the forward-looking statements and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Item 7 of this Form 10-K, and our consolidated financial statements and the accompanying notes thereto. Risks Related to Our Business Operations We are exposed to…

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