If asked to name the top-performing stocks powered by the AI boom, most investors would probably guess Nvidia (correct), maybe Meta (wrong) and a bunch of other hyperscalers (also wrong). You’d be hard pressed to find anyone who would answer Vertiv, an 80-year-old AC maker. But since Vertiv went public in early 2021, its market cap has exploded almost 10x from under $11 billion to $109 billion. Over that six-and-a-half year span, its annualized return of 50.5% stands third in the S&P 500, exceeded only by Comfort Systems (55.2%) and Nvidia (54.9%). And the story gets better from there. The…