These longtime market leaders still have something left in the tank.

Billionaire Ken Griffin, CEO of hedge fund Citadel Advisors, was busy during the second quarter. He and his team went shopping and substantially increased the firm's stake in some stocks, while also buying new ones.

Some of the biggest names on Wall Street, including Microsoft ( MSFT -2.68% ) and Apple ( AAPL -0.16% ) , were among the companies whose shares Griffin bought during the period.

These are two of the largest companies in the world by market cap that have generated life-changing returns over the long run. Both have also made moves in the fast-growing artificial intelligence (AI) market. But are these tech leaders still attractive to long-term investors with market caps above $3 trillion?

Let'

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