The biggest investors in the world often have a greater focus on the private than public markets, but with the artificial intelligence boom set to reshape the economy for decades to come, they can't afford to not pay close attention to what's taking place with the largest publicly traded tech stocks, and they are not worried. Amid fears about risky over-concentration in the so-called "Magnificent Seven" stocks that dominate the S&P 500 , and related fears of an AI bubble , two managers