Talk about a nervous market! Shares of Nvidia fell 5% on Monday on news of a $500 billion partnership the AI chip giant struck with South Korean conglomerate SK Group, along with a Wall Street Journal report that Nvidia was separately in talks to help OpenAI finance a $500 billion data center ...

"While Nvidia's investments and partnerships reinforce confidence in long-term AI buildouts, investors remain concerned about circular financing."

After reports of Nvidia in talks for deals worth more than $750 billion — with OpenAI, among others — insurance on Nvidia’s debt got more expensive. “There’s a fear of financial…