BANGKOK (AP) — Tokyo’s benchmark Nikkei 225 index tumbled more than 4% on Wednesday and other shares in Asia also sank after a retreat on Wall Street spurred by selling of Big Tech shares.

U.S. futures were slightly lower and oil prices also fell.

The Nikkei was trading down 4.7% at 49,104.05 by midday.

Shares in computer chip maker Tokyo Electron dropped 6.1% while stock in Advantest Corp., a maker of semiconductor testing equipment, lost 10%.

South Korea’s Kospi declined 3.7% to 3,977.24 as the country’s big tech companies followed others downward.

Samsung Electronics shed 4.4% and SK Hynix, which had logged major gains thanks to plans to develop artificial intelligence with chip maker Nvidia, lost 2.7%.

Chinese markets were less affected. The Shanghai Composite index slipped 0.3%

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