Wall Street’s main indices slumped, with the tech-heavy Nasdaq Composite index down 2.5 percent in late morning trading.

European and Asian markets closed lower.

“The reasons for the weakness are pretty clear cut,” said Briefing.com analyst Patrick O’Hare, pointing to Tesla’s report showing profits fell 45 percent in the second quarter owing to price cuts and aggressive AI investment.

Tesla shares tumbled more than 11 percent.

Shares in Google-parent Alphabet fell around four percent, which O’Hare put down to lower-than-expected advertising revenue at YouTube, although overall the company beat profit and revenue expectations.

Alphabet is also one of the so-called Magnificent Seven tech kings that have been key to driving gains in markets that have pushed Wall Street to multiple record highs in 2024.

The others — Apple, Amazon, Facebook-parent Meta, Microsoft and Nvidia — are due to report over the next few weeks.

“The first view on Big Tech earnings wasn’t inspiring,” said Ipek Ozkardeskaya, senior analyst at Swissquote Bank.

“Two of the Magnificent Seven stocks failed to create euphoria when they reported their second quarter results yesterday. The less-than-ideal set of earnings comes at a time when investors are questioning whether the AI rally has gotten ahead of itself,” she said.

Equities have largely been boosted this year by growing expectations that the US Federal Reserve will cut interest rates thanks to slowing inflation and a softening of the labour market.

The prospect of a more welcoming borrowing environment has heavily benefited tech firms, particularly as they have invested massively in AI, seeing it as the next big money-spinner.

“It is hard to see how the rally in markets can continue for now after several weaker than expected earnings reports including Tesla, LVMH and the US postal service,” said Kathleen Brooks, research director at trading platform XTB.

The latest corporate results “have led to concerns that stocks will fail to deliver the boost to earnings that would spur the next leg of the rally”, she added.

The Paris CAC 40 retreated 1.1 percent, with shares in luxury giant LVMH falling 4.5 percent after it posted a 14-percent drop in net profit in the first half of the year.

The Frankfurt DAX was also in the red, shedding 0.9 percent, with Deutsche Bank sinking 8.6 percent after it reported a loss of 143 million euros ($155 million) in the second quarter.

Investors are also awaiting later this week the release of key US economic growth data and the latest reading on personal consumption expenditure — the Fed’s favoured gauge of inflation — which could play a role in decision-makers’ thinking ahead of their next meeting.

The yen jumped around 1.5 percent higher against the dollar.

“Attention is now turning to the Bank of Japan meeting next week, and there is growing speculation that the central bank will raise interest rates by ten basis points,” said market analyst Fawad Razaqzada at City Index and FOREX.com.

Traders are also treading cautiously as they weigh the outlook for US policy post-election, with Democratic chances boosted by the expected nomination of Kamala Harris to replace President Joe Biden to battle Donald Trump in November.

New York – Dow: DOWN 0.9 percent at 39,983.59 points

New York – S&P 500: DOWN 1.6 percent at 5,465.39 

New York – Nasdaq Composite: DOWN 2.5 percent at 17,545.85

London – FTSE 100: DOWN 0.2 percent at 8,153.69 

Paris – CAC 40: DOWN 1.1 percent at 7,513.73

Frankfurt – DAX: DOWN 0.9 percent at 18,387.46

EURO STOXX 50: DOWN 1.1 percent at 4,861.87

Tokyo – Nikkei 225: DOWN 1.1 percent at 39,154.85 (close)

Hong Kong – Hang Seng Index: DOWN 0.9 percent at 17,311.05 (close)

Shanghai – Composite: DOWN 0.5 percent at 2,901.95 (close)

Euro/dollar: UP at $1.0858 from $1.0855 on Tuesday

Pound/dollar: UP at $1.2921 from $1.2907

Dollar/yen: DOWN at 153.34 yen from 155.62 yen

Euro/pound: DOWN at 84.02 pence at 84.08 pence

West Texas Intermediate: UP 1.0 percent at $77.69 per barrel

Brent North Sea Crude: UP 0.8 percent at $81.67 per barrel