Wall Street stocks retreated overnight, sharply reversing an early rally, as optimism over Nvidia's quarterly artificial intelligence results faded. Japan's Nikkei index closed sharply lower on Friday, weighed down by tech stocks, as new concerns about stock valuations led to losses on Wall Street overnight. "Nvidia's record profits failed to dispel concerns," said Fumika Shimizu, analyst at Nomura Securities. The index fell 2.4% to close at 48,625.88, ending the week down 3.5%. The broader Topix index fell 0.1%, losing 1.8% over the past five days.
