The KOSPI circuit breaker 2026 count reached eight on 28 July, when South Korea’s Korea Exchange suspended trading for 20 minutes after the benchmark index fell 8.02% to 6,213.51, with SK Hynix’s newly listed Nasdaq ADR closing below its $149 offer price for the first time.
The Level 1 mechanism triggered at 10:13 a.m. Seoul time, after the decline held above the 8% threshold for one continuous minute. Trading resumed via a 10-minute single-price call auction. By 11:20 a.m., Yonhap placed the index 8.59% lower at 6,175.71; Reuters reported a decline of approximately 9.4% by 12:41 p.m. Both figures were intraday.
Sidecar curbs had already paused programme trading earlier in the session, before the circuit breaker took the whole market offline. The two mechanisms are distinct: sidecars target algorithmic order flow; circuit breakers stop most trading across the board.
KOSPI Circuit Breaker 2026: A Record That Has Already Surpassed 2008
Tuesday’s halt was the 14th KOSPI circuit-breaker activation on record and the eighth of 2026 alone, following prior triggers on 4 and 9 March, 8, 23 and 26 June, and 7 and 13 July. The 13 July activation came after the index plunged more than 8%, with selling attributed to renewed U.S.-Iran tensions over the Strait of Hormuz.
Sidecar activity is running even hotter. According to 36Kr, as of 21 July the KOSPI market had triggered its sidecar mechanism 38 times and KOSDAQ 22 times since January. That dwarfs the prior annual record: Yahoo Finance reported that 2026 sidecar activity had already surpassed the 2008 financial crisis, when the KOSPI logged 26 such halts for the full year.
The driver on 28 July was the same as for most prior sessions: chip stocks. SK Hynix fell as much as 14% in Seoul and Samsung Electronics dropped as much as 13.4%, according to Reuters. Together the two chipmakers account for nearly half of the KOSPI index weight, so moves of that magnitude mechanically drag the benchmark.
Selling followed weakness in U.S. semiconductor shares as investors reassessed the financing of AI infrastructure. Concerns centred on whether chip suppliers were supporting customer demand through large financial commitments rather than organic order growth. The debut of Chinese memory producer ChangXin Memory Technologies and reports of domestic deep-ultraviolet lithography progress added pressure, though details on performance and commercial timeline remain undisclosed.
SK Hynix ADR: Below Offer Price, With Earnings Due
SK Hynix’s Nasdaq-listed ADR (ticker: SKHY, as confirmed in the company’s SEC Form F-1 filing) closed Monday’s U.S. session at $143.02, down 7.5% on the day. That marked the first regular-session close below the $149 offering price since trading began. The ADR opened at $159.61, hit a high of $164.30 and an intraday low of $139.10 before settling at $143.02; the lower $139.45 figure that circulated in early reports reflects an extended-hours quote.
The offering itself priced 177.9 million ADSs at $149, raising approximately $26.5 billion, per the SEC filing. Each ADS represents one-tenth of a Korean common share. Reuters reported the deal was more than seven times oversubscribed. According to The Elec, proceeds are earmarked entirely for capital investment against total planned CAPEX of 55.92 trillion won.
SK Hynix is scheduled to publish second-quarter results at 9:00 a.m. Korea time on 29 July. In the first quarter the company reported revenue of 52.58 trillion won and operating profit of 37.61 trillion won, driven by high-bandwidth memory and enterprise SSD demand. The Q2 print will be the first read on whether AI memory orders held through the macro turbulence. The newly issued common shares underlying the ADR also list on KOSPI on 29 July, which may affect short-term supply and index positioning.
Leveraged ETF Restrictions Tighten From 31 July
South Korea’s Financial Services Commission is moving in parallel. From 31 July, retail investors must hold at least 30 million won in cash to make new or additional purchases of single-stock leveraged exchange-traded products, up from the previous 10 million won threshold. The FSC had already suspended new listings and advertising for these products.
Reuters reported on 29 July that the FSC is also considering capping individual exposure to single-stock leveraged ETFs at 20% of total investment assets, alongside simulated trading requirements and an emergency stabilisation framework modelled on Hong Kong’s flexible leverage rules.
From 19 August, per the Financial Services Commission’s own press release, securities firms face strengthened premium/discount rate management duties, and investors will need to complete a mock trading session before accessing these products.
The immediate calendar is tight: SK Hynix earnings, the additional share listing, and the 31 July leverage rules all arrive within 48 hours of Tuesday’s halt. Whether SKHY can reclaim $149 before Q2 numbers land is the cleanest binary the market has right now.
