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Alphabet Lost $500bn in a Day on AI Fears
Google's parent company shed over $500 billion in market value after revealing AI search summaries are eating into ad revenue and cash flow turned deeply negative.
Google's parent company Alphabet shed more than $500 billion (roughly $690 billion CAD) in market value on Thursday, October 30, 2026, after its latest quarterly results rattled Wall Street. The company's stock dropped nearly 13% in a single day, hitting a six-month low, as investors absorbed two uncomfortable realities: AI-powered search is hurting the ad business that funds everything, and Alphabet is now burning through cash at an accelerating pace.
Amazon's stock fell 6% in after-hours trading the same day, for similar reasons. Together, the two results deepened a growing anxiety on Wall Street about whether Big Tech's AI spending spree is actually paying off.
The Numbers Look Fine Until They Don't
Alphabet's top-line results were, on paper, solid. Total revenue grew 25% year-over-year to $127.6 billion (about $176 billion CAD), driven in large part by Google Cloud, which more than doubled its revenue to nearly $31 billion.
But profits fell 25% during the quarter. More striking, Alphabet reported negative free cash flow exceeding $9 billion - almost twice the cash deficit it posted just three months earlier. Negative free cash flow means the company is spending more than it brings in, and the culprit is almost entirely AI infrastructure investment.
By market close Thursday, Alphabet's total value had dropped from $3.97 trillion to $3.46 trillion.
AI Search Is Cannibalizing Google's Core Business
The source of investor anxiety isn't just the spending. It's what the spending is doing to Google's most profitable product.
Google Search now defaults to AI-generated summaries at the top of results pages. That change has reduced the number of ads the company can sell alongside search results, which is the engine behind the vast majority of Alphabet's revenue. Tracy Woo, a principal analyst at Forrester, described the situation bluntly, saying Alphabet's disappointing search results "highlights the challenge of funding massive AI investments while maintaining the strength of established businesses."
Google's chief business officer Phillip Schindler said he felt "very good about our trajectory" on Wednesday. The stock's 13% drop the following day suggests investors felt differently.
Amazon Is in the Same Boat
Amazon's quarterly results compounded the mood. The company posted sales growth of 11%, reaching $201 billion (about $277 billion CAD) for the quarter. But its free cash flow came in at negative $42 billion - a six-fold increase in cash burn compared to the previous quarter.
CEO Andy Jassy told investors the spending was justified because Amazon sees a path to not one but two businesses that could eventually generate $1 trillion each in revenue. He did not name them.
What This Signals for the AI Trade
The sell-off reflects something investors have been circling for months: the gap between what AI costs to build and what it currently generates. Both Alphabet and Amazon are betting enormous sums that the returns will eventually follow. So far, the evidence is mixed.
For Canadians with exposure to U.S. tech through index funds, ETFs, or direct holdings - common in TFSA and RRSP portfolios - days like this are a reminder that the AI boom carries real financial risk alongside its hype. The companies spending the most are also the ones most exposed when results disappoint.