Macy's (M) stock sank after the biggest U.S. department store chain warned fourth-quarter sales would be at or below earlier estimates because of poor results from underperforming locations.

The S&P 500 and Nasdaq plunged at midday when Chinese artificial intelligence startup DeepSeek shook up the sector with a lower-cost large language model.

Under its new CEO, Starbucks is spending heavily to make itself a more welcoming coffeehouse with faster service.