By George Glover Online retailer Alibaba was leading a Chinese tech rally on Wednesday, as investors carried on ditching U.S. and South Korean memory-chip makers. Alibaba’s American depositary receipts surged 9% to $107.01 ahead of the opening bell. Rival e-commerce platform JD.com added 2.9%, while search-engine provider Baidu rose 4.7%. Those gains came as U.S. tech stumbled. Futures tracking the Nasdaq 100 slumped 1.2% lower on Wednesday, after President Donald Trump signaled that the cease-fire between the U.S. and Iran may be over. South Korea’s highflying KOSPI Composite also struggled, plunging 5.4% as investors fretted about spiking oil prices. The Chinese tech rally could be a sign that investors are pivoting toward developers of large-