US equity markets fell sharply after resuming trading following the Independence Day holiday long weekend, with the S&P 500 and Nasdaq retreating from record all-time highs as investors digested a flurry of headlines related to tariffs and global trade - Dow dropped -422-points or -0.94%,with Sherwin-Williams Co (down -2.18%) the worst performer in the 30-stock index, while seven other components fell over >1.5%. Nvidia Corp fell -0.69% to US$158.24 despite analysts at Citigroup lifting their target price to US$190 per share (from US$180 previously) and now calculating that the total addressable market for data-centre AI chips could be $563B by 2028 (versus a prior projection of US$500B).Citigroup believes sovereign AI, which refers to countries looking to build out their own AI infrastructure, could contribute “up to billions of dollars” to Nvidia’s top line in 2025 and will come to make up an even bigger portion of Nvidia’s business mix next year. Amazon.com Inc inched +0.03% higher and was the only member of the so-called ‘Magnificent Seven’ cohort of mega-capitalisation technology stocks to advance ahead of its annual “Prime Day” sale event kicking off tonight AEST (8 July). After sales hit an all-time high at last year’s event, Amazon has extended this year's sale to four days from two.