Wall Street endured its worst week in over a year as a powerful AI stock selloff rippled from New York to Seoul, erasing hundreds of billions in market value. The S&P 500 fell roughly 2% for the week, with the Nasdaq Composite suffering its steepest weekly decline since early 2025. A cascade of events — from high-profile AI researcher departures at Alphabet to Apple raising Mac and iPad prices due to chip shortages — rekindled fears that the AI investment boom may be outpacing real-world returns. Yet a standout earnings report from Micron Technology (MU) and a bullish $29 billion Nasdaq listing announcement from South Korean chipmaker SK Hynix provided evidence that the underlying memory chip cycle remains firmly intact.
The S&P 500 (^GSPC) opened the week at 7,472.79 on Monday June 22 and finished the week near 7,354, a decline of approximately 2% from the prior Friday's close of 7,500.58. The Nasdaq Composite, the epicenter of the selloff, shed more than 2.2% on Tuesday alone — its worst single-day drop since March — before recovering partially on Thursday after Micron's blowout earnings. The Dow Jones Industrial Average (^DJI), more insulated from tech volatility, traded in a tight band between 51,665 and 52,226, ending the week near 51,756 with a mild loss. The Russell 2000 small-cap index showed relative resilience early in the week, actually gaining on Monday as investors rotated away from mega-cap tech, but gave back gains by Friday.
Semiconductors and technology were the clear sector losers, with the Philadelphia Semiconductor Index falling sharply mid-week before partially recovering. Financials, healthcare, and industrials held up better by comparison. In commodities, oil prices extended their slide as the U.S.-Iran diplomatic talks boosted supply optimism, while gold pulled back from its recent highs after a vessel strike in the Strait of Hormuz briefly rattled oil markets before prices resumed their decline.
The week's most important story was a broad, global AI stock selloff that began Monday and stretched into a second day Tuesday. The immediate trigger was Alphabet (GOOGL) dropping nearly 6% on Monday after two of the company's most prominent AI researchers — John Jumper, a senior research scientist at Google DeepMind, and Noam Shazeer, a VP of engineering — announced departures for rival organizations, including OpenAI. Investors interpreted the talent exodus as a threat to Alphabet's competitive standing in the AI race. The shock spread to Amazon (AMZN), which fell 4.8%, Meta Platforms (META) fell 2.3%, and Microsoft (MSFT) dropped 3%.
South Korea's Kospi plunged 10.5% on Tuesday as chipmakers there sold off sharply. The New York Times described the selloff as "unnerving" and linked it to a broader investor debate: whether AI capital expenditures are generating sufficient returns to justify current valuations. Anxiety over possible Federal Reserve interest rate hikes in 2026 added to selling pressure.
SpaceX (Nasdaq: SPCX), which made its historic market debut on June 12 at a fixed IPO price of $135 per share and quickly surged to a high of $225.64, experienced a dramatic reversal this week. Shares fell 16% on Monday alone, erasing approximately $400 billion in market value. By Tuesday, shares had briefly dipped below the $150 opening-day price before recovering slightly. The catalyst was a combination of broader AI sector profit-taking, SpaceX's announcement of an investment-grade bond offering, and investor concerns about the company's elevated valuation following its record-breaking $75 billion IPO — the largest in U.S. history. SpaceX remains roughly 10% above its $135 IPO price as of week's end, but significantly off its highs.
On Thursday June 25, Apple (AAPL) announced sweeping price hikes across its Mac and iPad product lines, citing soaring costs for memory and storage chips driven by the AI data center boom. The MacBook Air (13-inch) rose from $1,099 to $1,299, the MacBook Pro (14-inch) jumped from $1,699 to $1,999, and the iPad Pro (11-inch) climbed from $999 to $1,199. The announcement sent Apple shares down roughly 6% on Friday, contributing to the week's extended tech sector selloff. Apple's price increases follow similar moves by PC makers and Microsoft earlier in the year and signal that the global memory chip shortage is now hitting consumer electronics budgets directly.
A report from The New York Times published late in the week indicated that OpenAI, the ChatGPT developer, may delay its anticipated initial public offering until 2027 rather than proceeding this year. The news added fresh uncertainty to AI sector sentiment on Friday, which was already under pressure from Apple's price hikes and renewed semiconductor weakness.
Micron Technology (Nasdaq: MU) was the week's biggest positive catalyst after reporting record-shattering fiscal Q3 2026 results after the close on Wednesday, June 24. Revenue reached $41.46 billion, more than quadrupling from $9.30 billion in the same period a year earlier. Non-GAAP earnings per share came in at $25.11, crushing analyst estimates of $20.20 by 24%. Net income surged to $28.24 billion from just $1.89 billion a year ago, with gross margins jumping to 84.9% from 39% in the prior year period.
The company's Core Data Center business was the standout, with revenue rising more than sevenfold to $11.5 billion from $1.53 billion a year ago. Cloud Memory revenue grew over 300% to $13.77 billion. Looking ahead, Micron guided Q4 2026 revenue to $50 billion and EPS of approximately $31.00, well ahead of Wall Street expectations. Micron CEO Sanjay Mehrotra called the results a reflection of "the strategic value of memory in the AI era" and announced multi-year Strategic Customer Agreements to enhance revenue durability. The stock jumped approximately 15% on the earnings news, and Micron's shares have now surged nearly 270% year-to-date, making it one of the S&P 500's best performers in 2026.
South Korean memory chip giant SK Hynix, a key Nvidia (NVDA) partner and Micron rival, announced plans to list its American Depositary Receipts on the Nasdaq under the ticker "SKHY" as soon as July 10, 2026. The company plans to issue 17.79 million new shares in ADR form, raising approximately $29.4 billion (45.45 trillion Korean won) — which would rank among the top five share sales ever globally. SK Hynix shares listed in Korea surged more than 11% on Thursday following Micron's strong earnings, which analysts called "a very positive read-across" for the company. SK Hynix's Korean stock has roughly tripled year-to-date and is up approximately 800% over the past 12 months.
Tesla (Nasdaq: TSLA) extended its recent downturn, with shares falling approximately 5% this week after reports emerged that the company had postponed its planned public demonstration of the next-generation Roadster to August or later. The delay added to investor frustration as Elon Musk had initially promised the unveiling for April 1, then pushed it to May or early June with no further updates. Tesla shares were down roughly 12% for the month of June and have declined more than 20% over the past six months. The stock closed Friday near $379, well below its 2026 highs.
Alphabet (Nasdaq: GOOGL) dropped nearly 6% on Monday, its worst single-session decline in over a year, after senior AI researcher John Jumper announced his departure from Google DeepMind — just days after VP of Engineering Noam Shazeer announced he was joining OpenAI. The talent departures raised questions about whether Alphabet can hold onto its AI research edge amid intensifying competition from OpenAI, Anthropic, and others.
The Federal Reserve's preferred inflation gauge, the Personal Consumption Expenditures (PCE) price index, surged 4.1% year-over-year in May 2026, the Bureau of Economic Analysis reported Thursday — the highest reading since April 2023 and the first time it topped 4.0% since that time. On a monthly basis, PCE rose 0.4%. Core PCE, which excludes food and energy, rose 3.4% year-over-year in May, ticking up from 3.3% in April and reaching its highest level since October 2023. Both measures remain well above the Fed's 2% target.
Economists largely attributed the elevated inflation readings to energy cost pressures linked to the ongoing U.S.-Iran conflict, which has disrupted Strait of Hormuz oil flows. Gregory Daco, chief economist at EY-Parthenon, noted that while lower energy prices may provide some relief in the second half, "core inflation is likely to remain uncomfortably firm above the Fed's 2% target." The data kept alive market speculation that the Fed may raise interest rates at some point in 2026.
The Bureau of Economic Analysis released its third (final) estimate for Q1 2026 GDP on Thursday, revising it upward to 2.1% annualized growth from 1.6% in the second estimate. The revision was larger than the 1.7% consensus forecast and primarily reflected a substantial downward revision to import growth — from 21.1% to 11.8% — which meant the trade deficit subtracted less from overall growth. However, consumer spending was revised sharply lower to just 0.5% annualized growth, the weakest pace since Q1 2022, signaling that households are feeling the pressure of elevated inflation and higher borrowing costs.
Initial claims for unemployment benefits fell 12,000 to a seasonally adjusted 215,000 for the week ending June 20, the Department of Labor reported Thursday — well below the 225,000 economist consensus. The strong reading pointed to continued labor market resilience despite rising inflation and borrowing costs. The four-week moving average was 224,250. Reuters noted that there have been "no signs of employers resorting to widespread layoffs" in response to surging costs from the Iran conflict, though companies remain cautious about new hiring.
The Fed held its federal funds rate steady at 3.50%–3.75% at its meeting the prior week, but the updated dot plot showed about half of FOMC policymakers now project at least one rate hike in 2026 — a meaningful shift from earlier in the year when rate cuts were the base case. New York Fed President John Williams said in prepared remarks Thursday that he expects inflation to edge down in coming quarters if supply disruptions from the Strait of Hormuz closure resolve relatively soon, but cautioned that the Iran conflict continues to create "significant and unpredictable risks" for the global economy. CME FedWatch data showed traders pricing in a nearly 90% chance of at least one Fed rate hike by year-end, up sharply from 57% just a week earlier.
This week delivered a sharp reminder that markets don't move in a straight line — even in the midst of a generational technology shift. The AI trade that drove the S&P 500 to all-time highs above 7,600 earlier this month ran into a confluence of headwinds: talent attrition at AI leaders, questions about monetization timelines, Apple's direct evidence that chip shortages are now taxing consumer budgets, and a Fed that has shifted from cutting rates to debating hikes in the span of a few months.
Yet the thesis for AI infrastructure investing remained intact in key ways. Micron's record $41.5 billion quarter — with revenue up more than 4x year-over-year and guidance of $50 billion next quarter — showed that memory demand is not slowing. SK Hynix's decision to raise $29 billion via a U.S. listing reflected deep confidence in the chip cycle. The divide between AI "spenders" (mega-cap tech) and AI "beneficiaries" (memory chipmakers, hardware, infrastructure) widened further this week.
Heading into July, investors should keep a close watch on inflation data, the Fed's next moves, and the strength of the U.S. labor market. A hot jobs report could push rate hike bets higher and extend the tech selloff. Conversely, any diplomatic progress on Iran — which has been a key driver of energy inflation — could provide a meaningful relief rally. The Q2 2026 earnings season begins in earnest in mid-July, and the bar is high after a year of explosive AI-driven growth.
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