Exhibit 99.1 News Release Axcelis Announces Financial Results for Third Quarter 2025 Q3 Highlights: BEVERLY, Mass.— November 4, 2025—Axcelis Technologies, Inc. (Nasdaq: ACLS) today announced financial results for the third quarter ended September 30, 2025. President and CEO Russell Low commented, "We delivered another solid quarter, with sales and earnings both exceeding our expectations. We are also pleased to report record CS&I revenue in the quarter, reflecting the success of our aftermarket strategy and ...