Asian Session · Wednesday 24 June 2026 The Nikkei Just Crashed 3.6%. The KOSPI Hit a Double Circuit-Breaker. USD/JPY Is at a 1986 High. And Today Micron Tells You Whether the AI Trade Is Intact
SoftBank -10.1%. Kioxia -15.1%. KOSPI down 8.1% and triggering circuit-breakers twice. The Nikkei has snapped an eight-session winning streak from all-time highs. USD/JPY at 161.83, just below Tuesday’s 162.22 cycle high. AUD/JPY on a six-day losing streak to 111.51. Australia’s CPI surprised 4.0% versus 4.4% expected. And today’s Micron earnings will tell the market whether this is a healthy correction or the beginning of a mid-cycle AI exhaustion.
Wednesday's Asian session opens in the shadow of the sharpest single-session AI sector unwind since late 2022. Japan's Nikkei 225 crashed 3.55% — 2,566 points — to close at 69,083, snapping an eight-session winning streak that had taken it to all-time highs above 72,095. SoftBank fell 10.1%. Kioxia collapsed 15.1%. Tokyo Electron shed 6.2%. Ibiden lost 6.6%. South Korea's KOSPI was far more extreme: down 8.1% to 8,375, triggering the Korea Exchange's circuit-breaker mechanism twice in a single session. Samsung Electronics and SK Hynix both fell roughly 12%.
The selloff is not purely technical. The catalyst was a combination of three things arriving simultaneously: reports that SK Hynix is slowing its HBM4 memory expansion and reallocating back toward conventional DRAM — which is the single most bearish possible signal for the AI memory investment thesis; SpaceX's massive debt issuance creating liquidity anxiety across high-growth names broadly; and broader concern about whether hyperscaler AI capex is approaching its mid-cycle plateau. Wednesday shows tentative stabilisation — the Nikkei opening approximately 0.3% lower, KOSPI recovering roughly 4% — but the defining event today is Micron Technology's earnings report. Micron is the proxy for whether the AI memory investment cycle is intact. What Micron says tonight is what the market will use to decide whether Tuesday was a buying opportunity or a warning.
SoftBank -10.1%. Kioxia -15.1%. KOSPI double circuit-breaker. The AI chip rout that started...