KOSPI fell nearly 9 percent to below 7,000 Monday, as a rout in semiconductor shares overshadowed the blockbuster U.S. debut of SK hynix's American depositary receipts (ADRs). SK hynix and Samsung Electronics, which together account for more than 60 percent of KOSPI's market capitalization, plunged 15.37 percent and 10.7 percent, respectively, dragging the index sharply lower. KOSPI closed at 6,806.93, down 8.95 percent from the previous session, according to the Korea Exchange. The sell-off triggered the market's 35th sell-side program-trading curb and seventh circuit breaker of the year. SK hynix ended at 1,845,000 won ($1,228.74), while Samsung Electronics closed at 254,500 won. The sell-off dashed hopes that SK hynix's U.S. listing would help revive the Korean stock market, which has fallen about 27.5 percent from its record intraday high of 9,385.59 set on June 19. SK hynix's ADRs, trading under the ticker SKHY, closed at $168 on Friday, up 12.8 percent from the $149 offering price. The listing surpassed Alibaba's to become the largest U.S. fundraising by a foreign company on record.