[Nasdaq 100 Index Rises 9.3% in Four Days, Boosting Nasdaq 100 Market Cap by $3.5 Trillion in Four Days] Strong earnings have bolstered investors' confidence in the prospects of artificial intelligence, driving the Nasdaq 100 Index up by 9.3% in just four days, marking the strongest rebound since April 2025, with a market cap surge of $3.5 trillion. The tech sector's rebound is broad-based, with gains seen across semiconductor companies, software firms, and hyperscale data center operators making significant capital expenditures. Stellar second-quarter performance has convinced investors that massive investments in artificial intelligence will not only persist but have already begun delivering returns for some major companies.