US stocks saw a massive sell-off Thursday, with tech shares hit hardest. CNBC reported that the tech leaders known as the Magnificent 7 lost a combined market value of about $1 trillion on the day. Separate chatter put the broader US market's single-day losses at $2.5 trillion, while Tesla and SpaceX together lost more than $420 billion. The drop is widely attributed to worries that artificial intelligence (AI) valuations are too high.
The numbers
| Metric | Figure | Source and basis |
|---|---|---|
| Magnificent 7 market-cap loss | About $1 trillion | CNBC Technology, reported the evening of Nov 5, US Eastern time |
| Broader US market-cap decline | $2.5 trillion | Hacker News citing a Reddit StockMarket thread; not verified by an authoritative body |
| Tesla and SpaceX combined loss | More than $420 billion | Separate CNBC report; individual amounts not disclosed |
CNBC Technology reported the evening of Nov 5, US Eastern time, that the Magnificent 7 lost about $1 trillion in market value in Thursday's tech rout, calling it one of the day's "most eye-popping stats." The report did not list individual stock declines but stressed that the scale of the sell-off was rare among tech pullbacks in recent years.
The Magnificent 7 typically comprises Apple, Microsoft, Google parent Alphabet, Amazon, Nvidia, Meta and Tesla. The collective slump reflects broad investor concern about rich valuations for AI-related stocks.
A Hacker News thread citing a Reddit StockMarket post said the entire US market shed $2.5 trillion in value Thursday. That figure complements CNBC's $1 trillion loss for the Magnificent 7, suggesting the sell-off may have spread beyond tech leaders to a wider range of market sectors. The $2.5 trillion figure comes from social-media discussion and has not been verified by an authoritative body; it is presented alongside CNBC's Magnificent 7 loss figure for readers' reference.
A separate CNBC report said Tesla and SpaceX, both owned by Elon Musk, lost more than $420 billion in combined market value after the midterms. The report linked the losses to the market environment after the 2026 midterm elections but did not detail the individual losses at each company. Tesla, as one of the Magnificent 7, is already included in the group's overall loss. SpaceX is privately held, and changes in its valuation typically show up through private-market transactions or funding rounds; the report did not disclose specifics of any valuation adjustment.
Analysis
Taken together, the threads point to concern about excessive valuations in the AI sector as the core trigger for the tech sell-off. CNBC described Thursday's decline as a "major stock sell-off" and focused on its striking scale. The data show the Magnificent 7's roughly $1 trillion loss against the broader market's $2.5 trillion decline, hinting the selling may have spread beyond tech leaders, though the overall market-cap figure still needs authoritative verification. The more than $420 billion combined loss at Tesla and SpaceX further underscores market caution toward high-valuation growth assets.
CNBC described Thursday's decline as a "major stock sell-off" and called the Magnificent 7's roughly $1 trillion market-cap loss one of the day's "most eye-popping stats."
What to watch
As of publication, no major institution had issued a formal comment on the fallout from the sell-off. Market attention is focused on whether the tech pullback will continue and whether AI-related companies face further valuation corrections. Watch Friday's premarket sentiment and share-price moves at major tech companies.