Exhibit 99.01 Eastman Announces First-Quarter 2026 Financial Results KINGSPORT, Tenn., April 30, 2026 – Eastman Chemical Company (NYSE:EMN) announced its first- quarter 2026 financial results. | (In millions, | | except | per share | | amounts; unaudited) | 1Q2026 | 1Q2025 | | --- | --- | --- | --- | --- | --- | --- | --- | | Sales | revenue | | | | | $2,177 | $2,290 | | Earnings | | before | interest | and | taxes ("EBIT") | 188 | 302 | | Adjusted | | EBIT* | | | | 200 | 311 | | Earnings | per | diluted | ...