The S&P 500 index of America's biggest companies has ended the year up 24.2 percent, in a major boost for many 401(K) savers. While stocks slipped slightly on the final trading day of 2023, it has been a surprisingly strong year of gains on Wall Street. The so-called Magnificent 7 companies - Apple, , Alphabet, Amazon, Nvidia, Platforms and - accounted for about two-thirds of the gains in the S&P 500 this year, according to S&P Indices. Nvidia leads the group with a gain of about 240 percent.
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