Exhibit 99.1 Ingevity Corporation 4920 O'Hear Avenue Suite 400 North Charleston, SC 29405 USA www.ingevity.com Contact: Caroline Monahan News 843-740-2068 media@ingevity.com Investors: John Nypaver 843-740-2002 investors@ingevity.com Ingevity reports fourth quarter and full year 2023 financial results Fourth Quarter (comparisons versus prior year period): • Net sales of $371.7 million decreased 3.1% • Net loss of $116.8 million and diluted loss per share of $3.23, including restructuring charges of $107.5 m ...