Exhibit 99.1 FOR IMMEDIATE RELEASE BAXTER REPORTS FIRST-QUARTER 2024 RESULTS • First-quarter sales from continuing operations of $3.59 billion increased 2% on a reported basis and 3% on a constant currency basis, exceeding the company’s previously issued guidance1 • First-quarter U.S. GAAP2 diluted earnings per share (EPS) from continuing operations were $0.07 and adjusted diluted EPS from continuing operations were $0.65, exceeding the company’s previously issued guidance • Baxter now expects full-year 202 ...