Global stocks turned in a mixed performance on Tuesday as tech shares struggled and a rally on optimism over a deal to end the US government shutdown faded.

Wall Street's main indices were mostly lower in early afternoon trading, with the tech-heavy Nasdaq Composite shedding 0.8 percent.

"The go-to explanation is that there is some consternation surrounding the AI trade," said Briefing.com analyst Patrick O'Hare.

Japan's SoftBank announced earlier it sold $5.8 billion worth of shares in US chip giant Nvidia last month.

Shares in Nvidia, whose processors are prized by companies training and operating AI models, fell 3.5 percent.

The sale comes amid debate whether the inflated prices of AI stocks have become a bubble.

Kathleen Brooks, research director at XTB, noted that Softbank did

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