US technology shares fell sharply on Friday, 30 October 2026, after investors questioned whether almost $1tn of artificial intelligence investment could generate sufficient returns.
Intel leads a broad technology sell-off
Intel shares plunged 28% in October after the chipmaker indicated that artificial intelligence investment would rise despite weaker demand for computers and microprocessors.
The fall erased more than $130bn from Intel’s market value, increasing pressure on a company already facing weaker revenue expectations and heavy equipment spending.
Alphabet shares declined 1.4% after dropping 12% on Thursday, 29 October 2026, when investors reacted to concerns about advertising revenue and artificial intelligence costs.
Meanwhile, the Nasdaq ended October with its worst monthly decline since March 2025, although the index remained higher than a year earlier.
Intel finance chief David Zinsner said the company did not expect to generate more cash than it spent during 2026.
He also forecast lower-than-expected fourth-quarter revenue and said the slowdown in personal computers was likely to continue through the first half of 2027.
Amazon and online platforms expose different risks
Amazon said on Thursday that its cash spending had increased sixfold over three months, as it expanded data centres, network equipment and server capacity.
The company has committed to spending $220bn during 2026, much of it supporting artificial intelligence services and the computing infrastructure they require.
Amazon shares recovered some losses but still closed 1.4% lower on Friday, reflecting concern that investment was rising faster than immediate cash generation.
Elsewhere, Reddit shares fell 29% after the platform reported weaker-than-expected daily user figures and warned about reduced referral traffic from Google.
Google’s artificial intelligence search features can provide answers directly, potentially reducing visits to websites such as Reddit that depend on search referrals.
Roblox shares dropped 18% after its daily active user numbers declined, giving investors a separate concern about audience growth and platform engagement.
Investors demand evidence of financial returns
Meta, Alphabet, Oracle, Amazon and Microsoft have together committed to spending $800bn on artificial intelligence during 2026, according to BBC News.
Alphabet separately expects to spend up to $205bn on investments during 2026, almost entirely on artificial intelligence-related projects.
Those projects include data centres, servers, network equipment and software designed to train or operate artificial intelligence systems.
The technology can automate tasks and produce answers or content, but companies must still show that customers will pay enough to cover development and operating costs.
Alphabet said its artificial intelligence summaries, displayed at the top of some search results, were affecting its core search advertising revenue.
Analysts are debating whether some technology valuations assume profits that the cost of building artificial intelligence infrastructure may not support.
Market falls leave an unresolved test
Investment manager Chris Low said major companies were showing growing pains as they pursued the artificial intelligence build-out, according to Reuters.
Kathleen Brookes of XTB said investors were punishing signs of disappointment in third-quarter earnings after a strong period for artificial intelligence-related shares.
Despite Friday’s decline, the Nasdaq was 7.8% higher than a year earlier, while Amazon had risen nearly 8% over the same period.
Alphabet was 1.3% lower over 12 months, showing that the market reaction differed between companies and did not represent a uniform collapse.
The next significant evidence will come from company earnings and spending updates, including whether artificial intelligence revenue begins to justify continuing capital commitments.
Intel must also manage weaker computer demand while funding higher equipment investment, leaving investors focused on cash flow, revenue and practical returns.
The sell-off has made the financial case for artificial intelligence spending a central question for shareholders, rather than simply rewarding announcements of larger investment.
For technology companies, the unresolved issue is whether expensive infrastructure will improve productivity and revenue quickly enough to support valuations and future expansion.
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