The 2026 Investor's Guide

AI has been the dominant force driving stock-market gains over the past year. The enormous infrastructure buildout and surrounding hype that sent tech valuations to record highs has settled into a standoff, as investors question whether massive spending will translate into real revenue. At the same time, tariffs and geopolitical tensions have made even the safest bets feel uncertain. Fortune’s finance editors and reporters are here to help you navigate what comes next.