Table of Contents Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, par value $0.01 per share WAY The Nasdaq Stock Market LLC Large accelerated filer ☐ Accelerated filer ☐ Non-accelerated filer ☒ Smaller reporting company ☐ Emerging growth company ☒ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June ...

Exhibit 99.1 Waystar Reports Second Quarter 2024 Results Revenue Growth of 20% year-over-year Net Loss of $27.7 million and non-GAAP net income of $5.0 million Net loss margin of (11.8)%; Adjusted EBITDA Margin of 40% LEHI, Utah and LOUISVILLE, Ky., August 7, 2024 — Waystar Holding Corp. (Nasdaq: WAY), a provider of leading healthcare payment software, today reported results for the three-month period ended June 30, 2024. "Waystar delivered strong performance across all key metrics in Q2," said Matt Hawkins ...