Exhibit 99.1 NASDAQ: WASH Contact: Elizabeth B. Eckel EVP, Chief Marketing & Corporate Communications Officer Telephone: (401) 348-1309 E-mail: ebeckel@washtrust.com Date: April 22, 2024 FOR IMMEDIATE RELEASE Washington Trust Reports First Quarter 2024 Earnings WESTERLY, R.I., April 22, 2024 (PR NEWSWIRE)…Washington Trust Bancorp, Inc. (Nasdaq: WASH), parent company of The Washington Trust Company, today announced first quarter 2024 net income of $10.9 million, or $0.64 per diluted share, compared to net in ...