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Carvana shares are headed for a double-digit weekly loss as a federal investigation into billionaire Mark Walter shines a spotlight on his minority stake in the online used-car retailer.

Editor's note: A previous version of this story, based on information provided by a Synchrony Financial executive, mischaracterized the collaboration between Synchrony and OpenAI. Details, quotes and characterizations attributed to Synchrony and the executive have been removed. A corrected version is below.

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Synchrony Financial, the credit card issuer for brands including Amazon, Walmart and Lowe's, is working with OpenAI to allow shoppers to buy products directly inside ChatGPT using their store cards.

Berkshire Hathaway sharply increased its stake in Alphabet in the second quarter, vaulting the Google parent into its three biggest stock holdings. The sprawling conglomerate also added to the size of its investments in Delta Air Lines and various homebuilders.

Steve Eisman is warning that the artificial intelligence boom has become increasingly dependent on the fortunes of just two companies: OpenAI and Anthropic.

Ken Griffin's Citadel posted strong gains across its major hedge funds in July, helped by a recovery in risk assets and a discounted purchase of assets from the collapse of Leopold Aschenbrenner's Situational Awareness to end the month, according to a person familiar with the firm's performance.

Michael Burry of "The Big Short" fame is sticking with his bearish wagers even as the S&P 500 surges to a record high, warning that the rally could still end in a sharp sell-off reminiscent of the 1987 stock-market crash.