Exhibit 99.1 Page 1 Second Quarter 2026 Earnings Release RPC, Inc. Reports Second Quarter 2026 Financial Results And Declares Regular Quarterly Cash Dividend ATLANTA, July 30, 2026 - RPC, Inc. (NYSE: RES) ("RPC" or the "Company"), a leading diversified oilfield services company, announced its unaudited results for the second quarter ended June 30, 2026. Non-GAAP and adjusted measures may include Adjusted operating income, Adjusted net income, Adjusted net income margin, Adjusted earnings per share (diluted) ...