Exhibit 99.1 Ingevity Corporation 4920 O'Hear Avenue Suite 400 North Charleston, SC 29405 USA www.ingevity.com Ingevity reports first quarter 2026 financial results First Quarter 2026 Results & Recent Highlights: NORTH CHARLESTON, S.C., May 6, 2026 – Ingevity Corporation (NYSE: NGVT) today reported its financial results for the first quarter of 2026. The results and guidance in this release include non-GAAP financial measures. Additional information, including definitions and reconciliations to the most com ...