The S&P 500 stock index will gain about 10% between now and the end of the year, driven by strong earnings and steady economic growth despite ongoing worries about U.S. President Donald Trump’s trade policies and disruption from artificial intelligence, according to a Reuters poll. By the end of 2026, the S&P 500 will be around 7,500, or 9.7% above Monday’s close, according to the median estimate of 44 strategists, analysts and portfolio managers polled in the past week. The index ended...