Nvidia shares fall in extended trade despite the A.I. chip giant posting a quarterly beat. Other Wall Street and Asian chip makers have been affected after hours but Nvidia CEO Jensen Huang remains bullish. CNBC learns that artificial intelligence start-up in talks for a new round of funding that could see it valued at more than $100bn. And Warren Buffet’s Berkshire Hathaway becomes the first company outside the tech sector to be valued at $1tn.  

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