Traders work on the floor at the New York Stock Exchange on 22 June 2026. A tech sell-off shook global markets as investors questioned soaring valuations and spending on AI infrastructure, with the Nasdaq closing 2.2% lower and AI stocks tumbling across the board.
23 June 2026 | New York, London, Tokyo, Seoul — Updated 16:30 GMT
It was only a matter of time. The warnings had been sounding for months. AI spending was a bubble reminiscent of the dot-com era. Seven tech companies made up 30% of the S&P 500's value. And now, the reckoning has begun.
A tech sell-off shook global markets on Tuesday as attention turned away from developments in the US war with Iran and toward the future of AI companies and chipmakers that have driven stock markets to record highs.
The Nasdaq closed 2.2% lower. The S&P 500 dropped 1.43%. Elon Musk's SpaceX, which debuted on the market on 12 June to much fanfare, dropped 16% on Monday. Alphabet had its worst day in over a year, falling 5%.
In Asia, the sell-off was even more brutal. South Korea's benchmark closed 10% down after SK Hynix and Samsung Electronics both plunged over 12%. Japan's Nikkei 225 dropped 3.5%.
Morgan Stanley has estimated that AI-related borrowing will surpass $500bn this year — a staggering figure that has investors questioning whether the AI boom is sustainable or a bubble waiting to burst.
"SpaceX is not yet part of the Nasdaq indices, but the fact that it is jumping on the bond train to fund excessive AI and infrastructure spending revives earlier concerns that Big Tech may be spending too much on AI infrastructure and increasingly financing that spending through debt," said Ipek Ozkardeskaya, senior analyst at Swissquote.
The heavy reliance on a single industry and a few key companies has some investors wondering if it's a matter of when, not if, there will be a burst. Those concerns have been heightened by signals from the Federal Reserve last week that it may increase interest rates to tackle rising inflation.
Welcome to the AI reckoning — where the party might be over before it really began.
📉 AI SELL-OFF — THE NUMBERS: Nasdaq ↓2.2% • S&P 500 ↓1.43% • SpaceX ↓16% (largest post-IPO drop) • Alphabet ↓5% (worst day in a year) • South Korea Kospi ↓10% • SK Hynix ↓12% • Samsung Electronics ↓12% • Nikkei 225 ↓3.5% • FTSE 100: steady • AI-related borrowing: $500bn+ (Morgan Stanley estimate) • 7 tech companies = 30% of S&P 500 value.
Wall Street Shaken: Nasdaq Plunges 2.2% as AI Bubble Fears Intensify
A tech sell-off shook global markets on Tuesday as attention turned away from developments in the US war with Iran and toward the future of AI companies and chipmakers that have driven stock markets to record highs.
The tech-heavy Nasdaq index closed 2.2% lower on Tuesday. The S&P 500 was also down by Tuesday afternoon, dropping 1.43% while the Dow remained steady.
All three major US indices have hit record highs this year, riding off a rush of funding to support AI technology and infrastructure. Nasdaq is up 10% for the year, while the Dow jumped 6% so far this year, breaching past 51,000 points, and the S&P 500 is up 7.3%.
But some economists have warned that the influx of AI spending is a bubble reminiscent of the dot-com bubble that burst in the early 2000s. Seven tech companies make up 30% of the S&P 500's value.
The heavy reliance on a single industry and a few key companies has some investors wondering if it's a matter of when, not if, there will be a burst. Those concerns have been heightened by signals from the Federal Reserve last week that it may increase interest rates, and therefore the cost of borrowing, in order to tackle rising inflation.
Those looking for signs of stumbling may have found confirmation after a series of developments on Monday. The stock market drop started when Google-parent, Alphabet, had its worst day on the market in over a year. A pair of high-profile AI researchers left the company last week, worrying investors. Alphabet's share price had dropped 5% by closing Monday.
📊 US MARKETS — DAY'S PERFORMANCE
- Nasdaq: ↓2.2% — tech-heavy index hardest hit
- S&P 500: ↓1.43% — broad-based losses
- Dow Jones: Steady — avoided the worst
- Alphabet (Google): ↓5% — worst day in over a year
- SpaceX: ↓16% — post-IPO boost continues to ebb
- Year-to-date gains: Nasdaq +10%, Dow +6%, S&P +7.3%
SpaceX Drops 16%: $20bn Bond Sale Raises Concerns
Elon Musk's SpaceX, which debuted on the market on 12 June to much fanfare, dropped 16% on Monday as the company's post-initial public offering (IPO) boost continued to ebb. On Monday, the company announced it was looking to raise $20bn in a bond sale, even after the company gained more than $85bn through its IPO, sparking concerns over the massive cost of the company's projects.
"SpaceX is not yet part of the Nasdaq indices, but the fact that it is jumping on the bond train to fund excessive AI and infrastructure spending revives earlier concerns that Big Tech may be spending too much on AI infrastructure and increasingly financing that spending through debt," said Ipek Ozkardeskaya, a senior analyst at Swissquote, noting that Morgan Stanley has estimated that AI-related borrowing will surpass $500bn this year.
Asia Hammered: Seoul Crashes 10% as Chipmakers Plunge
After the US stock market closed for the day on Monday, stocks in Asia appeared shaken by the drops around AI and tech companies. South Korea's benchmark closed 10% down on Tuesday after the country's largest chipmakers, SK Hynix and Samsung Electronics, both closed over 12% lower. Japan's Nikkei 225 was down 3.5% at the close of trading.
Some markets were able to avoid the sell-off, with London's FTSE 100 steady at closing Tuesday.
🌏 ASIA MARKETS — DAY'S PERFORMANCE
- South Korea Kospi: ↓10% — sharpest decline
- SK Hynix: ↓12% — major chipmaker hit hard
- Samsung Electronics: ↓12% — tech giant plunges
- Japan Nikkei 225: ↓3.5% — significant losses
- UK FTSE 100: Steady — European markets resilient
AI Debt Warning: $500bn and Counting
Morgan Stanley has estimated that AI-related borrowing will surpass $500bn this year. The staggering figure has investors questioning whether the AI boom is sustainable or a bubble waiting to burst.
The heavy reliance on a single industry and a few key companies has some investors wondering if it's a matter of when, not if, there will be a burst. Those concerns have been heightened by signals from the Federal Reserve last week that it may increase interest rates to tackle rising inflation.
📉 AI SELL-OFF: THE NUMBERS THAT DEFINE THE MARKET PANIC
📊 US MARKET PERFORMANCE
💥 WORST PERFORMERS
SpaceX
Post-IPO slump
SK Hynix
Chipmaker plunge
Samsung
Electronics crash
Alphabet
Worst day in a year
🌏 ASIA MARKET CARNAGE
💰 AI DEBT WARNING
AI-related borrowing (Morgan Stanley estimate)
📈 YEAR-TO-DATE vs TODAY'S DROP
Nasdaq
+10% YTD
-2.2% today
S&P 500
+7.3% YTD
-1.43% today
Dow Jones
+6% YTD
Steady today
🗣️ THE VOICES OF THE SELL-OFF
Ipek Ozkardeskaya (Swissquote):
"SpaceX jumping on the bond train to fund excessive AI and infrastructure spending revives earlier concerns that Big Tech may be spending too much on AI infrastructure and increasingly financing that spending through debt."
Market analyst:
"Seven tech companies make up 30% of the S&P 500's value. The heavy reliance on a single industry has some investors wondering if it's a matter of when, not if, there will be a burst."
📉 THE FINAL VERDICT: AI BUBBLE OR CORRECTION?
✅ THE BULL CASE:
- Markets are still up 6-10% year-to-date
- AI is transformative technology — not dot-com
- Corrections are healthy in bull markets
- SpaceX still a long-term winner
- FTSE 100 steady — Europe resilient
⚠️ THE BEAR CASE:
- $500bn AI debt — unsustainable?
- 7 tech companies = 30% of S&P 500
- Alphabet researchers leaving — red flag
- SpaceX dropping 16% — post-IPO glow fading
- Fed rate hikes could burst the bubble
"The warnings had been sounding for months. AI spending was a bubble reminiscent of the dot-com era. Seven tech companies made up 30% of the S&P 500's value. And now, the reckoning has begun. The Nasdaq dropped 2.2%. SpaceX fell 16%. Seoul crashed 10%. Morgan Stanley warned of $500bn in AI debt. The question is no longer whether the AI boom is real — it is. The question is whether the market got ahead of itself. And if this is just a correction, or the beginning of something much worse."
— AI Market Analysis
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