Why tech sell-offs wipe billions off billionaire fortunes in a single day

A tech sell-off can wipe tens of billions of dollars off a single billionaire in one session because the richest people hold most of their wealth in a handful of listed tech shares. On Thursday 5 November 2026, Elon Musk lost $79.7 billion (about ₹7.5 lakh crore) in a day, according to the Bloomberg Billionaires Index, as SpaceX shares fell 9.05% and Tesla 10.77% 1.

That same day the Nasdaq closed 5.5% lower, its worst session since April 2025 2. This explainer sets out why billionaire net worth drops so fast in a tech sell-off, and why most of those losses are on paper. Rupee figures use ₹94.05 to the dollar, the rate on 7 November 2026.

What happened in the tech sell-off of November 2026

The sell-off followed the US midterm elections. Investors worried that a Democratic landslide and growing local opposition to data centres would slow spending on AI infrastructure 3. More than 50 S&P 1500 technology stocks fell 10% or more, and tech underperformed the S&P 500 by 10.7% over the past month, the most extreme one-month gap since May 2002, according to Truist Advisory Services 3.

The losses spread to Asia on Friday. Twenty-two billionaires from China, Japan, Taiwan and South Korea in the world’s 500 richest lost more than $18 billion between them by mid-morning in Hong Kong, according to Bloomberg 4.

Reason 1: their wealth sits in one or two stocks

Most of the richest people own large stakes in the companies they founded. SpaceX shares make up nearly four-fifths of Musk’s fortune, according to Forbes 5. When a stock that dominant falls 9% in a session, the founder’s net worth falls almost as fast. A typical retail investor with a spread of funds would see a fraction of that move.

Concentration also explains why the gains were so large on the way up. Tech billionaires accounted for all of the $845 billion (about ₹79.5 lakh crore) added to Bloomberg’s index in 2026 up to October, while those with fortunes outside tech were $62 billion poorer, according to a summary of Bloomberg’s analysis 6.

Reason 2: AI shares move in the same direction

Many of today’s largest fortunes are tied to the same theme. Chipmakers, cloud providers, data centre builders and AI labs tend to rise and fall together because investors treat them as one trade. On 6 November, SK Hynix fell 11.7%, Samsung Electronics nearly 10% and TSMC 8.5% 7. When the AI trade unwinds, founders across the US and Asia lose money at the same time.

Reason 3: leverage multiplies the swing

Some fortunes sit on top of companies that borrow heavily. Masayoshi Son controls SoftBank Group, which holds large stakes in AI companies funded partly with debt. SoftBank shares fell 10.8% in Tokyo on 6 November, cutting Son’s fortune by $3.9 billion to about $29 billion, per Bloomberg. The cost of insuring SoftBank’s debt against default rose to 466 basis points, its highest since October 2022 8. Debt raises returns in a rally and deepens losses in a fall.

Reason 4: newly listed companies are more volatile

Companies that have only just gone public often swing more than established ones, because their shares are still finding a level. SpaceX listed on the Nasdaq on 12 June 2026, and its moves now drive Musk’s wealth more than Tesla’s do 5. Investors are watching the same risk ahead of Anthropic’s planned listing, which faces pressure to accept a lower valuation, as covered in the Anthropic IPO valuation debate.

Are the losses real?

Mostly not, in cash terms. A billionaire’s net worth is an estimate based on the market price of shares they own. Unless they sell or have borrowed against those shares, a fall in price does not take money out of their bank account. It lowers what their holdings would fetch on that day.

The losses become real in three situations: if the founder sells during the slump, if lenders demand more collateral on loans backed by shares, or if the company itself struggles to raise money. That last risk is why investors watch whether AI firms can still fund themselves on good terms 3.

Why India’s richest gained on the same day

The same Thursday that cut US fortunes lifted India’s two richest men. Gautam Adani’s wealth rose $1.12 billion to $117 billion and Mukesh Ambani’s rose $510 million to $87.3 billion on the Bloomberg index, as Indian shares climbed while US markets fell 1. Fortunes built on Indian conglomerates in ports, energy, refining and telecom are less exposed to the US AI trade. Read where they rank in the richest people in the world right now.

How to read a headline about a billionaire’s loss

Check three things. First, which list the figure comes from, because Forbes and Bloomberg can differ by tens of billions of dollars, as explained in Forbes vs Bloomberg net worth. Second, the date and time, because fortunes move during the trading day. Third, whether anything was actually sold. Our net worth methodology sets out how we report these changes.

Sources

[1] Punjab Kesari, report citing the Bloomberg Billionaires Index, 6 November 2026. [2] Gulf News (AFP), Shares plunge in Tokyo, Seoul after US tech rout, 6 November 2026. [3] Business Standard (Reuters), Investors seek lower valuation as AI backlash clouds Anthropic IPO plans, 6 November 2026. [4] Bloomberg, AI Elite Lose $18 Billion as Chip Stock Rout Spreads to Asia, 6 November 2026. [5] Forbes, The top 10 richest people in the world (November 2026). [6] AI Weekly, summary of Bloomberg Billionaires Index analysis, October 2026. [7] Peter Thiel news digest, report citing Fox Business on Asian chip stocks, 6 November 2026. [8] Billionaires.Africa, report citing Bloomberg on SoftBank, 6 November 2026.

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