Alphabet Loses About $500 Billion in Market Value as AI Spending Worries Investors

Shares of Google’s parent fell more than 12% on October 29, according to reports, as concerns grew over AI spending, search advertising and cash flow.

Alphabet’s shares reportedly plunged more than 12% on Thursday, October 29, wiping out roughly $500 billion in market value, The Times of India reported. The sell-off followed the company’s quarterly results and reflected investor worry over rising AI spending, pressure on search advertising and unclear returns on huge technology investments.

According to the report, it was Alphabet’s worst single-day share price fall on record and the second-largest one-day loss in market value by any company, after Nvidia’s near-$600 billion drop in early 2025.

Results raise questions

The report says Alphabet released earnings on Wednesday, with sales falling short of analysts’ expectations. Investors focused on the outlook for Google’s search advertising business, long one of its biggest sources of revenue and profit.

AI chatbots and conversational search tools are changing how people find information, with more users going to AI platforms for direct answers and recommendations. That raises questions about how sustainable Google’s advertising-led search model is if user behaviour shifts faster than the company can adapt its products and monetisation.

AI spending puts cash flow in focus

Capital expenditure is a growing concern. The report says Alphabet spent $51.4 billion in the third quarter alone, against $91.4 billion for the whole of calendar 2025. The money goes into data centres, computing infrastructure and other resources for building and running AI models and services. Investors increasingly want proof that the spending will turn into lasting revenue and profit.

Free cash flow, the cash left after operating costs and investment, is another worry. The report says Alphabet recorded negative free cash flow for a second straight quarter. This streak began earlier in the year: Semafor reported in July that free cash flow had turned negative for the first time in the company’s 22 years as a public company, alongside a higher 2026 AI spending plan of $205 billion and a roughly 7% share drop that day.

Negative free cash flow does not mean a company is unprofitable. It does mean investment is outrunning the cash the business generates, which can leave less room for dividends, buybacks and other priorities.

A different picture at Microsoft

The report contrasts Alphabet with Microsoft, which it says reported $18.6 billion in free cash flow for the third quarter while continuing to invest heavily in AI infrastructure. While Alphabet’s shares fell sharply on Thursday, Microsoft’s stock ended largely unchanged.

The contrast shows investors judging not just the scale of AI spending but also how well each company can fund it and show returns. Announcing ambitious AI plans is no longer enough. Investors now want to see how the spending will lift revenue, margins and long-term cash generation.

A new test for the AI boom

The sell-off points to a broader reassessment of the AI boom. Tech companies are committing huge sums to chips, data centres and computing capacity in one of the biggest infrastructure cycles the sector has seen, but the commercial returns are still uncertain. Companies must show that demand for AI services will keep growing, that customers will pay enough to cover the infrastructure costs, and that new products can reach meaningful profits quickly.

For Alphabet, the challenge is sharp: it must keep investing in AI to compete while protecting the search advertising business that has driven its growth for decades. The reaction suggests investors are becoming more selective, with the focus shifting to measurable returns and disciplined capital allocation.

This article is for information only and is not investment advice.

Sources: The Times of India; Semafor.