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 overseeing tens of billions of dollars from investors told CNBC at its Delivering Alpha conference last week they remain bullish on what's taking place in the U.S. tech sector and the huge sums being invested in AI.

Coatue Management founder and portfolio manager Philippe Laffont, whose fund ma

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