Exhibit 99.1 Appian Announces First Quarter 2024 Financial Results First quarter cloud subscription revenue increased 24% year-over-year to $86.6 million McLean, VA – May 2, 2024 – Appian (Nasdaq: APPN) today announced financial results for the first quarter ended March 31, 2024. “Appian continues to push technological boundaries in our industry, from AI-backed services to process mining. Organizations globally are recognizing the power and simplicity of the Appian Platform,” said Matt Calkins, CEO & Founde ...