EXHIBIT 99.1 JULY 31, 2025 NEWS FOR IMMEDIATE RELEASE CONTACT: ERIC J. DOSCH, CFO 985.375.0308 First Guaranty Bancshares, Inc. Announces Second Quarter 2025 Financial Results Hammond, Louisiana, July 31, 2025 – First Guaranty Bancshares, Inc. ("First Guaranty") (NASDAQ: FGBI), the holding company for First Guaranty Bank, announced its unaudited financial results for the second quarter and six months ending June 30, 2025. Financial Highlights for the second quarter and six months ended June 30, 2025, are as ...