US stocks opened lower on August 20, with the Dow down 0.6%, S&P 500 down 0.3%, and Nasdaq down 0.5%; Walmart fell 7% after Q2 same-store sales growth hit a six-year low and full-year earnings guidance missed expectations; Alibaba dropped 4.7% post-earnings; SK Hynix rose 4% after a preliminary wage agreement; Micron rose 0.4% on a $10B ten-year US memory R&D investment plan.

Jin1008/20, 08:30 PM