Exhibit 99.1 February 27, 2024 Zeta Delivers Fourth Consecutive Year of 20%+ Revenue Growth in 2023 Finished 2023 with 10 straight quarters of beating & raising guidance • Delivered revenue of $210M, up 20$729M, up 23% Y/Y in 2023 • Increased Scaled Customer count 12% Y/Y and Super-Scaled Customer count 27% Y/Y • Grew Scaled Customer ARPU 10% Y/Y to $1.57M in 2023 • Generated cash flow from operating activities of$27M in 4Q’23, and $91M in 2023 • Guiding to fifth consecutive year of 20% ...