Exhibit 99.1 ZTO Reports First Quarter 2025 Unaudited Financial Results Parcels Volume Increased 19.1% to 8.5 Billion Adjusted Net Income Grew 1.6% to RMB2.3 Billion Annual Volume Guidance Reiterated to Grow 20%-24% SHANGHAI, May 21, 2025/PRNewswire/ - ZTO Express (Cayman) Inc. (NYSE: ZTO and SEHK: 2057), a leading and fast- growing express delivery company in China ("ZTO" or the "Company"), today announced its unaudited financial results for the first quarter ended March 31, 2025. The Company grew parcel v ...