"Tariff war" hits its worst day! The market value of the US stock market's "technology giants" Mag 7 evaporates by nearly $800 billion in a single day

"Tariff war" hits its worst day! The market value of the US stock market's "technology giants" Mag 7 evaporates by nearly $800 billion in a single day

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Alphabet's capital expenditures have spiraled out of control, Tesla's profits have disappointed badly, and the Middle East conflict has pushed up oil prices. As a result, the Mag 7 lost nearly $800 billion in market value in a single day.

On Thursday, July 23, the combined market value of the US stock market's "Magnificent 7" (Mag 7) evaporated by $797 billion in a single day, with the Mag 7 index falling 4.8%, the largest single-day drop since the "Tariff Storm" in April 2025. The S&P 500 fell 1.2%, and the Nasdaq 100 fell 1.9%.

Trigger: Alphabet's free cash flow turns negative for the first time, Tesla's profits fall far short

The immediate trigger of the crash was the financial reports released by Alphabet and Tesla after the close of trading on July 23.

Alphabet: Strong growth in cloud computing in the second quarter, net profits exceeding expectations by 216%, but capital expenditure figures shocked investors—a single-quarter capex of $45 billion, with annual capex ceiling raised to $205 billion. More crucially, this spending turned Alphabet’s free cash flow negative for the first time since its IPO.

Jason Lemire, Chief Investment Officer of Bold Wealth Partners, said: “This shows that the risks of this stock are now far greater than when it was a cash-generation machine.”

Notably, Alphabet’s cash flow turned negative against the backdrop of also-underperforming operating cash flow—even with net profit far above expectations, it still couldn't "plug" the hole left by capital expenditures. In addition, Alphabet reported $10 billion in inventories, reflecting this former search and advertising company’s deep transformation.

Tesla: Revenues exceeded expectations, but margins and EPS fell far short of analysts' forecasts. CEO Musk told investors that Tesla “should spend capital expenditures as fast as possible—sooner rather than later, as long as it’s not wasteful,” adding that 2026 will be a “year of massive capital expenditure.”

Result: Tesla’s shares plunged 15% in one day, the biggest single-day drop since March 2025; Alphabet fell 7.1%, the biggest drop since May 2025.

All seven giants fall, Apple becomes the 'exception'

All seven Mag 7 members fell, but the size of the losses varied:

  • Tesla: -15%
  • Alphabet: -7.1%
  • Amazon: -4.6%
  • Meta: -3.4%
  • Microsoft: -2.2%
  • Apple: smallest drop

Apple is the exception in this round of declines. The company has largely remained on the sidelines in the AI arms race, not following the trend of massive capital expenditures. Investors have instead rewarded this “restraint”—Apple's shares have risen 11% this month and 18% so far this year.

Microsoft, Amazon, and Meta will release earnings next week, and the market is already wary of similar investor reactions.

Chip stocks were comparatively resilient that day, with the Philadelphia Semiconductor Index down just 0.5% and still up more than 70% year-to-date.

BTIG analyst Jonathan Krinsky dubbed the current situation “Hypershrinkers.” He noted that in past Mag 7 sell-offs, whenever the Mag 7 fell -3% or more in a day, the Philadelphia Semiconductor Index never posted a gain—but this time, the semiconductor index was barely affected.

How long can this divergence last? The market is watching.

Narrative reversal: AI spending has burned through, where is the return?

Behind this sell-off is an increasingly sharp question: Was all this spending worth it?

Ken Mahoney, CEO of Mahoney Asset Management, said: “The real question is the scale of the spending happening now. No one knows what the return on investment is.”

He added that the macro backdrop—including oil price increases due to escalation in the Iran war—is putting extra pressure on these stocks. “It’s a perfect storm.”

For more than three years, Wall Street has cheered almost unconditionally the massive AI investments; each new capex plan sent share prices soaring. But now, the logic has reversed—if huge investments don’t translate into tangible, large-scale returns, stock prices get punished.

Lemire said: “These companies once had the healthiest balance sheets in U.S. corporate history, now they've become heavy-asset companies and ROI has become an issue. That’s a major shift in how investors view them—and that’s not even considering their growing but opaque debt obligations in the coming years.”

Data shows the Mag 7 index has now fallen 11% from its late May peak, erasing up to $2 trillion in market value.

Macro pressures: Oil prices and rate hike expectations both heat up

The market also faced macro shocks on the same day.

Iran-backed Houthi forces claimed to have attacked two Saudi oil tankers in the Red Sea, pushing Brent crude above $100/barrel for the first time in two months. Meanwhile, tensions between the US and Iran keep escalating—the US CENTCOM announced its 12th consecutive night of strikes on Iran, and Trump warned on social media that if the Houthis keep attacking ships, he will impose “major military punishment” on Iran.

Bob McNally, President of Rapidan Energy Group, said: “The spillover of the second round of military conflict will be broader than the first, bringing great risks to shipping and energy infrastructure.”

The oil price shock directly affects inflation expectations. The market now gives the Federal Reserve a roughly 38% chance of hiking rates at next week’s FOMC meeting, with 2-year Treasury yields up 6bps in a day and the 30-year real interest rate approaching 3%, the highest since 2008.

Mahoney summed up: “Macro factors—including the escalation of the Iran conflict and higher oil prices—are putting additional pressure on these stocks.”

Rob Haworth, Senior Investment Strategy Director at US Bank Wealth Management, added: “If oil prices stay in the $90-$120 range through the end of summer, that’s when we start to see a greater hit to consumer spending, and wage growth just can’t keep up.”

Market structure under pressure, volatility may further amplify

From a market structure perspective, the impact of this decline may not be limited to just this.

The S&P 500 has fallen below its 50-day moving average (7462), and the Nasdaq also closed below its 50-day average. According to SpotGamma analysis, the S&P 500 has broken the key risk pivot at 7480; currently, moderate positive gamma support may cushion the initial drop, but if put option buying intensifies, dealers could shift to a negative gamma regime, opening up a path toward 7300.

Charlie McElligott of Nomura warned that real CTA (trend-following funds) deleveraging has appeared, with the “flip to short” trigger point now close at hand. He also noted that VIX’s seasonal pattern is about to “take off” in August, amid low liquidity and risk tolerance.

Bitcoin also wasn’t spared, falling below $65,000, despite more than $1 billion of ETF inflows this week. Gold is under pressure as the dollar strengthens.

Goldman Sachs’s trading desk listed several psychological levels to watch: the S&P 500’s 50-day average (7462), 10-year Treasury yield at 4.7%, WTI crude at $90, and the VIX at 20.

 

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