Inside the June 2026 Semiconductor Selloff: Why a $1 Trillion Wipeout Was an ‘Expectations Reset’ After a Record Rally

Company-by-Company Damage Report

The Broadcom miss acted as a wrecking ball that swung through the entire semiconductor complex. The losses across two days were historic in scale.

Broadcom (AVGO) was ground zero. The stock plummeted roughly 20% from its pre-earnings peak, vaporizing approximately $450 billion in market value from global portfolios . Combined with Micron, the two companies collectively shed approximately $380 billion on June 4 alone, each posting their largest-ever single-day market cap loss in company history .

Micron Technology (MU) was caught in the downdraft, with shares falling 6.6 to 7% on June 4 before accelerating to a 13.3% loss on June 5 as the selloff intensified .

Nvidia (NVDA) initially appeared resilient, dipping only 0.6% on June 4 . However, the pain was merely delayed. As contagion spread, Nvidia became one of the hardest-hit AI heavyweights on June 5 as the broader rout accelerated .

TSMC (TSM) fell roughly 1.9% in U.S. trading on June 4, with further declines following as the selloff cascaded into Asian markets the next day .

The Philadelphia Semiconductor Index (SOX) served as the ultimate barometer of the devastation, plunging 10.3% on June 5—its largest single-day drop since the pandemic shock of March 2020 . By the weekend, U.S.-traded chipmakers had collectively lost over $1 trillion in market value .

Contagion: How the Shockwave Went Global

The selloff in U.S. markets immediately ricocheted across global exchanges, with Asia bearing the brunt of the impact.

South Korea was the epicenter of the contagion. The benchmark KOSPI plunged more than 5% on Friday, June 5, closing at 8,161.59 . The decline was so rapid that it triggered a "sidecar" circuit breaker, which temporarily halted program trading to curb volatility . The tech-heavy KOSDAQ index also tumbled, briefly falling into the 900 range for the first time in three months .

Memory chip giants led the KOSPI's decline, given their direct exposure to the AI supply chain. SK Hynix, a key supplier of high-bandwidth memory to Nvidia, saw its stock tumble nearly 10% . Samsung Electronics fell sharply as foreign investors led a concentrated liquidation of semiconductor shares . Local media outlets labeled the event a "Black Friday" for chip stocks . Japan's Nikkei also closed down 1.3%, tracking the regional decline .

European markets felt the pressure as well, with chip-equipment makers like ASML declining in sympathy, though the selloff was less severe than in Asia .

Why a 143% Revenue Jump Wasn't Enough: An 'Expectations Reset'

Wall Street analysts were quick to frame the rout not as a sign of crumbling fundamentals, but as a violent recalibration of expectations. The term "expectations reset" became the prevailing narrative.

The context is critical. A 79.3% rally in the semiconductor sector over just 100 trading days meant that stocks were "just overripe," as WolfStreet described it, with three companies in the Trillion Dollar Club becoming acutely vulnerable to any disappointment .

Perfection had been priced in. Broadcom's AI revenue was still growing at over 200% year-over-year on a guided basis, a staggering figure in almost any other context . However, the market had already extrapolated even more aggressive growth, creating a precarious "whisper number" above the published consensus . When the guidance came in merely excellent rather than extraordinary, a massive profit-taking event ensued .

This dynamic revived nagging doubts beneath the AI boom. The selloff surfaced questions about the long-term sustainability of hyperscale capital expenditure and whether competition would inevitably pressure margins . As Semafor reported, fresh doubts surfaced over the sustainability of the AI spending surge that had propelled the historic rally . The rout was a stark reminder that in a market driven by momentum, the threshold for good news can become impossibly high.