These two AI players have a particularly close relationship.

Nvidia ( NVDA 0.34% ) has built an artificial intelligence (AI) empire thanks to the dominance of its AI chips and its expansion into a wide variety of other related offerings. But the company isn't isolating itself, and instead, has looked to work with others -- even much smaller players -- in this AI boom. One company in particular has become a key Nvidia ally, and that's CoreWeave ( CRWV 2.77% ) .

CoreWeave launched an initial public offering in March, and the stock has since surged about 195%, buoyed by the company's soaring sales -- and its relationship with Nvidia. The AI chip giant held a 7% stake in CoreWeave as of the end of the second quarter, and CoreWeave makes up 91% of Nvidia's investment portfolio.

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