Meet the Best-Performing S&P 500 Stock This Year. It's New to the Index, and You Won't Believe What Wall Street Expects From It in 2025.

The S&P 500 (^GSPC -0.00%) soared from the very start of the year, confirming its presence in a bull market and going on to reach record high after record high. And today, the benchmark continues this momentum, now heading for an annual gain of more than 27%. That follows last year's 24% increase, marking two fantastic years for investors.Technology companies have contributed significantly to the movement, as investors poured into those winning in the area of artificial intelligence (AI). With AI's promise ...