Stock market futures tumbled on June 23, 2026, as a global technology selloff intensified and concerns over artificial intelligence buildout costs weighed on investor sentiment.
S&P 500 futures fell 1.45%, while contracts on the tech-heavy Nasdaq 100 sank 2.69%, according to Reuters. Dow Jones Industrial Average futures declined 0.61%, marking the start of what traders feared would be another difficult session for equities.
The selloff began in Asia, where South Korea’s Kospi index plummeted 9.99%, its steepest drop in more than three months, according to Reuters. Chipmakers led the rout: SK Hynix dropped 12.47% and Samsung Electronics fell 12.31%, according to Anadolu Ajansı. The two companies together account for roughly half the Kospi’s weighting, making the index particularly vulnerable to their declines.
Investors cited two primary concerns dragging down tech stocks. Reuters reported that markets were reacting to “AI buildout costs, Fed rate outlook” as the main headwinds. The strong U.S. jobs report released earlier in June had raised expectations for a potential Federal Reserve interest rate hike, which would increase borrowing costs for the massive capital expenditures companies are undertaking to build artificial intelligence infrastructure.
The global spread of the selloff underscored how interconnected tech markets have become. A sell-off in South Korean memory chipmakers quickly reverberated through U.S. futures markets, with major U.S. tech names facing pressure. CNBC reported that “South Korea’s tech-heavy Kospi index closing 10% lower” had triggered a 20-minute trading halt, while the index was “dragged down by chipmaker SK Hynix and tech giant Samsung.”
This marked a continuation of volatility that had gripped markets earlier in June. On June 5, 2026, the Nasdaq Composite fell 4.18%, its worst day since April 2025, as concerns about the sustainability of the AI boom and expectations of higher interest rates spooked investors. A similar pattern of recovery followed by renewed selling pressure had characterized the month, with futures swinging between gains and losses as traders reassessed the outlook for technology stocks.
Sources
- Reuters — Nasdaq futures decline figures, AI buildout costs and Fed rate outlook as drivers, South Korea Kospi plunge and SK Hynix/Samsung declines
- CNBC — South Korea Kospi closing 10% lower, SK Hynix and Samsung Electronics declines, global tech rout details
- Bloomberg — Kospi closed down 10%, SK Hynix and Samsung sliding more than 12%, trading halt details
- Barron’s — S&P 500 futures dropped 1.5%, Nasdaq 100 futures plunged 2.6%, Dow futures fell 350 points
- The New York Times — S&P 500 futures fell 1.5%, Kospi fell 10% with 20-minute trading halt
- Anadolu Ajansı — SK Hynix dropped 12.47%, Samsung Electronics fell 12.31%
