Exhibit 99.1 NEWS Contact: Jeffrey Schnell Vice President, Investor Relations investor@quakerhoughton.com T. 1.610.832.4087 For Release: Immediate QUAKER HOUGHTON ANNOUNCES FIRST QUARTER 2024 RESULTS • Q1’24 net sales of $469.8 million, net income of $35.2 million and earnings per diluted share of $1.95 • Q1’24 non-GAAP net income of $37.7 million and non-GAAP earnings per diluted share of $2.09 • Delivered adjusted EBITDA of $83.3 million in Q1’24, a 6% increase compared to $78.8 million in Q1’23 • Gross m ...