Kospi jumps 5 percent as buy sidecars trigger in Seoul

Asian technology shares extended their rebound on Tuesday, with SoftBank Group surging 11 percent in Tokyo and SK Hynix jumping 8.01 percent in Seoul, after the Kospi rose 5.46 percent in early trading and buy sidecars halted programme buying in both Korean markets.

Why it matters: The surge reverses part of last week’s chip-led selloff in Seoul and follows gains in United States peers on Monday, a test of whether dip buying in the AI trade holds after the rout that triggered sell sidecars days earlier.

Data as of Yonhap News Agency report of November 10, 2026, in Korean, read in full via the estate browser route, for the Korea Exchange sidecar times and index figures; Bloomberg report of November 9, 2026, opening portion read via the estate browser route (the rest is paywalled), for Samsung Electronics and SK Hynix each climbing more than 5 percent and the dip-buying account. Updated November 9, 2026, 20:07 Toronto, with CNBC's report of November 9, 2026, read in full via the estate browser route, for the later Korean chip figures and the Tokyo moves; CNBC's headline puts SoftBank Group's rise at 11 percent and its text at 12 percent, and this item uses the headline figure. Developing item.

Latest: The rebound broadened across Asia on Tuesday. In Seoul, SK Hynix jumped 8.01 percent, Samsung Electronics rose 5.32 percent and Samsung SDI climbed 6.27 percent, CNBC reported. In Tokyo, SoftBank Group surged 11 percent, chip-testing equipment maker Advantest gained 5.41 percent, Tokyo Electron rose 5.88 percent, Lasertec advanced 6.34 percent and Disco advanced 6.95 percent. CNBC tied the moves to Wall Street’s overnight rebound, in which the Nasdaq Composite climbed 2.74 percent and the S&P 500 rose 2.35 percent, its best day since April 8, and to a sharp decline in oil prices lifting sentiment after last week’s selloff in technology shares.

South Korean stocks surged about 5 percent in early trading on Tuesday, November 10, and buy sidecars, the Korea Exchange mechanism that suspends programme buy orders for five minutes after a sharp futures move, triggered in both markets, Yonhap reported. The Kospi sidecar fired at 09:06 after the Kospi 200 futures index rose 5.76 percent to 821.04, and the Kosdaq sidecar followed at 09:10; by 09:16 the Kospi stood at 5,293.11, up 5.46 percent, and the Kosdaq at 671.58, up 5.10 percent.

Bloomberg reported that Samsung Electronics and SK Hynix each climbed more than 5 percent as investors bought back into the artificial intelligence trade after last week’s selloff, following big gains in United States peers on Monday even as Nvidia fell.

Kospi jumps 5 percent as buy sidecars trigger in Seoul

Sources