New York: Seven of the world’s biggest technology companies, collectively known as the Magnificent Seven, lost more than $1 trillion in market value in a single trading session on Thursday, November 5, as a massive sell-off in artificial intelligence (AI) and semiconductor stocks swept across Wall Street.

The seven companies — Nvidia, Tesla, Microsoft, Apple, Alphabet, Amazon and Meta Platforms — recorded a combined market capitalisation loss of approximately $1.006 trillion. The sell-off came amid investor concerns that the changing political landscape in the United States could bring tighter scrutiny of AI infrastructure expansion, particularly the construction of large data centres.

Nvidia accounted for the biggest share of the losses, with an estimated $431 billion wiped off its market value. Tesla, Microsoft, Apple, Alphabet, Amazon and Meta also suffered significant declines. The sharp fall highlighted the vulnerability of major technology stocks after a period of heavy investment and strong market expectations surrounding artificial intelligence.

Nvidia leads the wealth erosion

Nvidia suffered the largest loss among the seven companies, with its market capitalisation declining by an estimated $431 billion during Thursday’s session. Its shares fell 8.85%, reflecting the pressure on companies closely associated with the AI infrastructure boom.

Tesla recorded the second-largest market value loss, estimated at $181 billion. Its shares dropped 11.88%, making it the worst performer among the Magnificent Seven in percentage terms.

Microsoft lost approximately $123 billion in market value, while Apple saw an estimated $85 billion wiped off its valuation. Alphabet’s market capitalisation declined by around $65 billion, followed by Amazon at $61 billion and Meta Platforms at $60 billion.

The seven companies had a combined market capitalisation of approximately $23.52 trillion at the close of November 4, before the sharp sell-off.

The percentage declines varied across the group. Apart from Nvidia and Tesla, Microsoft fell 2.96%, Meta declined 4.26%, Amazon dropped 2.11%, Alphabet lost 1.84% and Apple slipped 1.66%.

Semiconductor and AI-linked stocks face heavy selling

The sell-off extended beyond the seven technology giants, with semiconductor manufacturers and companies linked to AI data centres facing particularly strong pressure.

Micron Technology and Advanced Micro Devices (AMD) both fell by around 17%, while cloud computing company CoreWeave also recorded a sharp decline. The Philadelphia Semiconductor Index dropped approximately 12%, marking one of its steepest daily falls.

Investors have increasingly focused on the companies supplying the chips, servers, computing capacity and other infrastructure required to develop and operate advanced AI systems. These businesses have benefited from rising demand as technology companies and cloud service providers invest heavily in AI.

However, the latest market movement suggests that investors are reassessing the risks associated with the pace of expansion. Companies building data centres require substantial capital, electricity, water and access to suitable locations. Any delay in projects or increase in operating costs could affect the growth expectations of businesses supplying the infrastructure.

Reuters also reported that shares of data centre operators and AI infrastructure companies came under pressure as investors considered the possibility of slower expansion and tighter financial conditions.

Nasdaq enters correction territory

The technology-led sell-off dragged the major US stock indices sharply lower.

The Nasdaq Composite fell 5.52% to close at 24,315. The decline pushed the index into correction territory, meaning it had fallen more than 10% from its recent record high.

The S&P 500 dropped 4.36% to settle at 7,353.73, while the Dow Jones Industrial Average declined by 1,833 points, or 3.44%, to close at 51,523.06.

All three major US indices recorded their steepest single-day percentage declines since April 2025, when markets were shaken by the announcement of sweeping US tariffs.

The Nasdaq’s decline was particularly significant because of the heavy presence of technology and AI-related companies in the index. A sharp fall in a relatively small group of large companies can have an outsized impact on the broader market.

The sell-off also affected smaller companies and other sectors, indicating that investor concerns had spread beyond individual technology stocks. The Associated Press reported that the Russell 2000 index of smaller US companies also fell sharply during the session.

US midterm election results trigger AI regulation concerns

One of the main factors behind Thursday’s market decline was the outcome of the US midterm elections. The Democrats’ strong performance raised questions about whether the changing political balance in Washington could lead to closer scrutiny of the rapid expansion of AI data centres.

Investors are concerned that policymakers could introduce restrictions or additional approval requirements for new data centre projects. Such measures could slow construction and affect companies that depend on the continued expansion of AI computing capacity.

Data centres are central to the development of modern AI systems. They house the servers and specialised processors required to train and operate large models. However, these facilities consume substantial amounts of electricity and water, raising concerns among communities and policymakers about their environmental and infrastructure impact.

A more restrictive regulatory environment could increase project costs, delay construction or force companies to reconsider their expansion plans. These risks are particularly relevant for semiconductor manufacturers, server suppliers and cloud computing firms that have benefited from rising investment in AI infrastructure.

Reuters reported that investors were also assessing whether the political shift could affect the pace of AI infrastructure development in states that have become important centres for data centre investment.

Investors question whether AI spending will deliver returns

The market decline also reflects a broader debate over the financial returns from the enormous investments being made in artificial intelligence.

Major technology companies have committed billions of dollars to data centres, advanced processors, cloud infrastructure and AI development. These investments are intended to support future growth and strengthen their position in a rapidly changing technology industry.

However, investors are increasingly asking how quickly these expenditures will translate into revenue and profits. Building large-scale infrastructure requires significant upfront spending, while the commercial benefits may take time to materialise.

If demand for AI services does not grow quickly enough to justify the investments, companies could face pressure on their margins and valuations. The possibility of regulatory restrictions adds another uncertainty to an already expensive expansion strategy.

The latest sell-off does not establish that the AI industry is heading for a collapse. Instead, it demonstrates that investors are becoming more sensitive to the costs, risks and expected returns associated with the sector.

What the sell-off means for global markets

The loss of more than $1 trillion in combined market value among the Magnificent Seven is a reminder of how strongly global stock markets are influenced by a handful of large technology companies.

For international investors, a sharp correction in US technology shares can affect portfolios, global technology funds and market sentiment in other regions. Indian investors with exposure to US equities or international mutual funds may also see the impact reflected in their overseas holdings.

However, a fall in US technology stocks does not automatically indicate a similar decline in Indian equities. Domestic market performance depends on several factors, including company earnings, economic growth, foreign investment flows, interest rates and sector-specific developments.

The immediate concern for Wall Street is whether the technology sell-off will remain concentrated in AI and semiconductor stocks or spread further across the market. Investors will also watch political developments and corporate spending plans for signs of how the AI infrastructure industry may evolve.

Thursday’s session marked a major setback for some of the world’s most valuable companies. With questions mounting over data centre expansion, regulatory oversight and the returns from AI investments, technology stocks may remain sensitive to fresh developments in the coming sessions.