US stocks fell this week as investors reacted to disappointing Big Tech earnings, oil above $100 and sharp swings in semiconductor shares.
The Nasdaq lost around 2% between July 19 and July 25. The S&P 500 fell 0.6%, while the Dow dropped 0.4%. Technology stocks faced the heaviest pressure.
Here are the three biggest US stock market stories retail traders need to know.
Big Techs AI Bill Shakes Wall Street
Tesla and Alphabet triggered a broad technology sell-off after their earnings reports raised concerns about the cost of AI investment.
Tesla shares fell 14.5% after the company reported negative free cash flow for the first time in more than two years. Investors also remained concerned about weaker vehicle demand and the cost of funding new products.
Alphabet dropped 7% after raising its expected 2026 capital spending to around $200 billion. The company reported strong cloud growth, but the higher spending forecast overshadowed those gains.
Tesla Stock Price Chart. Source: Yahoo Finance
As a result, the Nasdaq fell more than 2% on Thursday. The sell-off also increased pressure on Microsoft, Amazon and Meta ahead of their earnings.
The market has rewarded companies that spend heavily on AI. However, investors now want clearer evidence that this spending will produce stronger profits.
$100 Oil Brings Inflation Fears Back
Brent crude moved above $100 a barrel after rising tensions between the US and Iran raised fears of disruption to global oil supplies.
The price increase quickly spread across financial markets. Treasury yields climbed as traders considered whether higher energy costs could keep inflation elevated.
Higher yields usually put pressure on growth stocks. They reduce the present value of future earnings and make bonds more attractive compared with expensive equities.
The oil rally also hurt companies that depend on fuel or transport. Airlines, logistics firms and consumer businesses could face higher operating costs if crude prices remain elevated.
US crude oil price
1st of July: $68
Now: $90 pic.twitter.com/sKJs8MATN4
— The Spectator Index (@spectatorindex) July 25, 2026
Meanwhile, energy and defence stocks gained support. Investors moved toward sectors that could benefit from higher oil prices and increased geopolitical risk.
Crypto also faced pressure during the risk-off move. Bitcoin often trades like a high-growth asset when bond yields rise and investors reduce exposure to speculative markets.
Chip Stocks Swing Between Hope and Fear
Semiconductor stocks experienced some of the weeks biggest moves as traders shifted between optimism over AI demand and concern about excessive spending.
The Philadelphia Semiconductor Index rose more than 5% on Tuesday. Micron, Western Digital and Sandisk posted double-digit gains as investors bought the sector after an earlier sell-off.
Super Micro Computer also jumped almost 20% after reporting more than $60 billion in new orders. The update showed that demand for AI servers and data-centre equipment remained strong.
However, the recovery did not last. The semiconductor index fell 4.5% on Friday as wider concerns about AI spending returned.
Semiconductor Stocks are on the brink of entering a bear market after falling 19% from Junes all-time high ???? ????
— Barchart (@Barchart) July 17, 2026
Intel dropped almost 8% despite issuing stronger-than-expected guidance. Investors focused on its higher investment plans and the cost of competing in advanced chip production.
The moves showed how sensitive semiconductor stocks have become. Strong demand can still support the sector, but high valuations leave little room for disappointing earnings or rising costs.
For retail traders, the main risk remains volatility. AI-related stocks can move sharply even when companies report solid results.