Exhibit 99.1 Myers Industries Announces First Quarter 2024 Results Newly acquired Signature Systems delivers strong results due to Infrastructure tailwinds. Management maintains full-year outlook guiding to lower end of earnings-per-share range, based on Q1 results and weakness in Automotive Aftermarket, Vehicle and Consumer end markets. Additional Self-Help actions to be taken in near term to improve EBITDA while executing five-year roadmap as outlined during recent Investor Day. May 7, 2024, Akron, Ohio - ...