(Adds executive quotes in paragraphs 4, 8 and 11; estimates in paragraph 15) By Prakhar Srivastava and Lananh Nguyen Sept 29 (Reuters) – Jefferies beat third-quarter profit estimates on Monday, as record advisory fees and a rebound in dealmaking gave investors an early read on how Wall Street's investment-banking business may perform this earnings season. Despite a short pause in April as tariff concerns briefly clouded sentiment, optimism around M&A has remained strong. Companies have pressed ahead with multibillion-dollar transactions across sectors, reflecting confidence in growth prospects and a willingness to commit capital even in a choppy policy environment. Dealmakers say the pipeline for 2026 remains strong, with expectations of Federal Reserve rate cuts adding to confidence that

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