Closing Bell: South Korea Tech Selloff Spills onto Wall Street Despite Strong U.S. PMI

A tech-led liquidation swept through global equity markets, triggered by a violent selloff including leveraged exchange-traded funds in South Korea that quickly crossed the Pacific to slam U.S. semiconductor and hardware shares.  

Investors aggressively unwound overextended artificial intelligence infrastructure bets, shifting their focus squarely from recent geopolitical relief to sky-high tech valuations and mounting questions over corporate capital expenditure. 

The tech-heavy Nasdaq Composite ($COMP) spearheaded the global rout, sliding 2.21% to close at 25,587.03, while the S&P 500 (SPX) fell 1.44% to 7,365.46. In contrast, the blue-chip Dow Jones Industrial Average ($DJI) managed a minor decline, edging lower by 0.09% to finish at 51,666.84, as capital actively rotated out of high-flying technology names and into defensive value shelters. 

In commodities, crude oil benchmarks declined as shipping traffic passed through the critical Strait of Hormuz. 

Three things to watch from today’s market: 

• South Korea Tech Rout Triggers Global Semiconductor Avalanche: South Korea's benchmark KOSPI index collapsed, down roughly 10%, driven by a forced liquidation of leveraged ETFs. The primary trigger was a highly circulated industry report indicating that market leader SK Hynix is delaying its high-end AI HBM4 DRAM assembly upgrades, shifting its immediate manufacturing lines back toward general-purpose DRAM to capture surging legacy pricing margins. This sparked fear over the near-term velocity of global AI infrastructure demand. Consequently, Samsung Electronics and SK Hynix fell more than 12% in Seoul, causing an immediate chain reaction that struck Micron Technology (MU) and SanDisk (SNDK) both down over -13%. Broader chip weights Advanced Micro Devices (AMD), Qualcomm (QCOM), Marvell (MRVL), Seagate (STX), and Western Digital (WDC) were caught in the intense crossfire. The iShares MSCI Emerging Markets ETF (EEM), which counts Taiwan Semiconductor Manufacturing Company Ltd., Samsung Electronics and SK Hynix among its top holdings, was down 5% Tuesday.  
• Domestic Flash PMI Hits Multi-Year High to Signal Resilient Growth: While tech sector equity prices fell, underlying U.S. business activity painted a picture of economic strength. The S&P Global flash U.S. Manufacturing PMI jumped to 55.7, which is its most robust expansion since 2022. The Services PMI ticked higher to 51.3. The combined readings signaled that domestic demand remains highly resilient. This macroeconomic stability provided small-caps and non-tech cyclicals with a strong defensive floor, allowing the S&P 500 and Nasdaq to climb significantly off their worst intraday lows by midday. 
• SpaceX Shrugs Off Equity Meltdown with Landmark Bond Debut: Bucking the broader tech retreat, Space Exploration Technologies (SPCX) caught a bid during intraday trading. The company witnessed strong institutional demand for its inaugural investment-grade senior unsecured bond sale. Debt investors aggressively piled into the multi-billion-dollar notes offering, which was framed to secure structural capital for global Starlink ground hubs and expanding data facilities. 

Economic Events/Data June 24 (ET): 

• 08:30 AM: Building Permits (May Final) 
• 10:00 AM: New Home Sales (May) 
• 01:00 PM: 5-Year Note Auction 
• 04:00 PM: Federal Reserve Annual Bank Stress Test Results 

Earnings Calendar June 24 (ET): 

Premarket 

• Paychex, Inc. (PAYX) 
• Novagold Resources (NG) 
• Daktronics, Inc. (DAKT) 

Postmarket 

• Micron Technology (MU) 
• Trip.com Group Ltd.  (TCOM) 

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