Tech stocks-heavy Nasdaq at lowest since Sept 2020 amid global growth concerns

US shares tumbled on Tuesday, with the Nasdaq posting its steepest one-day rout since September 2020, while European stocks extended losses for a third session as investors warily awaited US tech earnings and fretted over global growth.

China's COVID-19 curbs and fears of aggressive US Federal Reserve tightening continued to damp risk appetite and lifted the dollar to new two-year highs. Oil prices rebounded in volatile trading and gold prices rose on safe-haven buying.

The tech-heavy Nasdaq led Wall Street lower, closing at its lowest since late 2020. The Dow Jones Industrial Average fell 2.38 percent to end at 33,240.18 points, while the S&P 500 lost 2.81 percent to 4,175.2. The Nasdaq Composite dropped 3.95 percent to 12,490.74.

Alphabet Inc and Microsoft Corp both fell almost 4 percent ahead of their results after the closing bell. About a third of S&P 500 companies are set to report results this week.

"There's a lot of anxiety ahead of the earnings which are coming up Tuesday, Wednesday and Thursday just because if they don't hold up, then there's nothing left to hold up the market," said Thomas Hayes, chairman of Great Hill Capital LLC in New York. The MSCI world equity index fell 13.6 points, or 2.03 percent, to 655.01.

The pan-Europe STOXX 600 index closed lower, with technology stocks down 2.3 percent at six-week lows and banks dropping 2.3 percent. The index had rallied up to 1 percent earlier in the session amid strong earnings from companies including Swiss bank UBS and shipping giant Maersk.

China's blue-chip index fell another 0.8 percent after its worst day in two years on Monday, even as the central bank vowed to step up prudent monetary policy support, particularly for small firms hit by COVID-19.

Three-fourths of Beijing's 22 million people lined up for COVID-19 tests as the Chinese capital raced to stamp out a nascent outbreak and avert the city-wide lockdown that debilitated Shanghai for a month.

"There's a little bit of a growth scare coming in but in our view there won't be an immediate slowdown to growth or inflation," said Mike Kelly, head of global multi-asset at PineBridge Investments. But Manishi Raychaudhuri, Asia-Pacific equity strategist at BNP Paribas, said if Chinese lockdowns persisted, it would affect China's economy significantly, with an impact on global supply chains.

News that Elon Musk had clinched a deal to buy Twitter for $44 billion in cash had buoyed tech stocks on Monday, but shares of the social media platform fell on Tuesday. Tesla slumped 12 percent on concerns Musk may sell some of his stake, contributing more than any other stock to the S&P 500 and Nasdaq's steep declines.

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"Tech stocks will stay front-and-center" as earnings progress this week, Deutsche Bank Research analysts said in a note.

Investors also eyed the Federal Reserve meeting next week. Markets have been fretting that an aggressive pace of tightening by the Fed could derail the global economy, which has only just started to recover from the pandemic. The Fed is expected to raise rates by a half a percentage point at each of its next two meetings.

"It is unrealistic to think that the US can raise interest rates in this way without looking at the real economy," said Carlo Franchini, head of institutional clients at Banca Ifigest, adding he was also worried about hawkish signals in Europe.

The European Central Bank's Martins Kazaks joined a chorus of policymakers urging a swift exit from stimulus measures, suggesting the bank should raise rates soon, and has room for up to three hikes this year. The ECB will next meet on June 9 where policymakers are expected to put a firm end date on bond buys and provide clearer guidance on interest rates.

US Treasury yields slipped on Tuesday as uncertainties surrounding the war in Ukraine and the Fed's efforts to bring down inflation kept investors cautious about the future despite better-than-expected economic data.

The yield on benchmark 10-year Treasury notes fell to 2.73 percent. Germany's 10-year yields, the benchmark of the euro bloc, also fell, trading at 0.802 percent, after falling more than 11 basis points the day before.

In currency markets, the dollar rose 0.63 percent against a basket of rivals to a fresh two-year high.

China's offshore yuan fell against the dollar, but stayed above Monday's year-low of 6.6090 after the People's Bank of China said it would cut the amount of foreign exchange banks must hold as reserves.

Oil prices rebounded on China's plans to support its economy. Brent crude futures settled up $2.67, or 2.6 percent, at $104.99 a barrel, while U.S. West Texas Intermediate contracts were up $3.16, or 3.2 percent, at $101.70.

Spot gold edged up 0.44 percent by 4:42 p.m. EST (2042 GMT) as investors sought safe-haven assets. Gold futures settled up 0.43 percent at $1,901.40 per ounce. Palladium prices rose 1.99 percent after Monday's steep decline on Chinese demand worries.

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