US Stocks Open: Nasdaq Falls 2.4%, Philadelphia Semiconductor Index Drops Over 7%
Miles Bennett
US tech stocks extended their sell-off at Tuesday's open — the Nasdaq fell 2.4% and the Philadelphia Semiconductor Index plunged 7.32%, as AI valuation doubts collided with rising rate-hike expectations in a systemic stress test for high-multiple names.
Why are chips getting hit the hardest?
Memory chips led the rout: Micron down 11.92%, SanDisk down 11.36%, Western Digital down 9.78%.
The AI compute chain fell in tandem: TSMC down 6.09%, Super Micro down 5.36%, Nvidia down 3.40%.
This means → the market is not punishing one company — it is issuing a no-confidence vote on the entire semiconductor supply chain.
Are the mega-caps falling together?
Not uniformly — Alphabet fell 1.99%, Meta 0.34%, Apple just 0.11%.
Yet Microsoft rose 1.02% and Amazon gained 0.21%; capital is rotating *within* big tech.
In plain terms = money has not left tech — it is moving from high-risk chip names to steadier cash-flow platforms.
What is the core logic behind this sell-off?
Hyperscalers have committed hundreds of billions of dollars to AI infrastructure, but there is no clear evidence AI products can generate returns to cover that spend.
Rate expectations are compounding the pressure: traders now price in 50 basis points of hikes by year-end, up from 25 basis points just two weeks ago.
This means → "massive spend with no proven payoff" + "rates still rising" — two headwinds squeezing high-valuation stocks at once.
Tech stocks had gone vertical and were severely overbought — the current correction is simply digesting that overbought condition.
Joachim Klement
Investment strategist, Panmure Liberum
(June 23, 2026, market commentary)
Why is Alphabet being singled out?
Nobel laureate and senior DeepMind scientist John Jumper announced his departure to join AI start-up Anthropic.
On Monday Alphabet's stock closed down 5%, erasing roughly $22.5 billion in market cap — its largest single-day loss ever.
This reflects deeper concern that Google cannot retain top AI talent — with both Anthropic and OpenAI planning IPOs, the talent war will only intensify.
What role is the new Fed chair playing?
Per the CME FedWatch tool, rate-hike expectations jumped from 25 basis points two weeks ago to 50 basis points now.
New Fed Chair Kevin Warsh's hawkish stance is being priced as the core driver of that shift.
In plain terms = the market thought rates would rise once — now it expects twice. The higher rates go, the harder it is for high-multiple stocks to hold up.
What comes next?
The nearest catalyst: Micron's earnings report after Wednesday's close.
The key metric is whether gross margins can hold above 80% — rising competition from Chinese memory chipmakers is pressuring pricing power.
This means → Micron's numbers will tell the market whether this memory-chip sell-off is an overreaction or just the beginning.
Content is for reference only, not financial advice.