A lower-profile compounder is putting up impressive growth rates in key business metrics while trading at a far more reasonable valuation.With tech giants racing to buy up artificial intelligence (AI) hardware, Nvidia remains the market's headline act. But an under-the-radar winner has quietly posted even stronger stock performance this year. The stock? Interactive Brokers (IBKR -0.49%), an electronic brokerage that prides itself on global reach and automation. And unlike many of 2025's hype-driven stocks, ...