Alphabet Loses $500 Billion as Microsoft Earnings Ease AI Spending Fears

Alphabet and Microsoft faced the same test: whether their businesses could generate enough growth and cash to support heavy investment in artificial intelligence. Their quarterly results produced sharply different market reactions.

Alphabet's search and advertising sales disappointed, reviving fears that AI is weakening Google's core business, according to Bloomberg Technology. Microsoft beat earnings and revenue expectations, with Azure cloud growth sending its shares about 4 percent higher in initial trading after the report, SiliconANGLE reported.

Coverage on October 29 identified a central problem for Google: AI searches bring in less money than traditional searches. Ars Technica reported that Alphabet was working to address that gap with more advertising. Business Insider reported that AI overviews had encouraged more searches, but Google was not making money at the same rate.

The concern extended beyond advertising. Alphabet reported more negative free cash flow than analysts expected while maintaining its annual spending guidance, according to CNBC. Investors were confronting both pressure on search economics and the cost of building AI capacity.

By the October 29 close, Alphabet shares had fallen 12.29 percent, their worst daily performance on record, Mashable reported. CNBC put the loss in market value at about $500 billion. Earlier reports gave different intraday declines, including a fall of as much as 15.8 percent reported by NBC News, rather than the final closing result.

Microsoft's figures offered a contrast. Revenue rose 19 percent to $92.3 billion, cloud revenue reached $63.9 billion and Azure grew 48 percent, according to Business Line. Its investment bill remained substantial: The Hindu reported quarterly capital expenditure of $45.2 billion and the addition of 24 data centres.

Microsoft also disclosed $10 billion in quarterly revenue from its business with OpenAI, roughly 11 percent of total sales, The Next Web reported on October 29. Later that day, Amazon added to the mixed earnings picture: its cloud business grew 39 percent, but total revenue and earnings missed estimates, sending shares down more than 7 percent in extended trading, according to Quartz.

Alphabet's record decline has turned a disappointing earnings report into a broader test of confidence in AI investment. Its shares reached a six-month low after disclosures about AI search summaries affecting advertising revenue, BBC News reported.

Microsoft has provided stronger evidence of demand through Azure growth, but the wider concern has not disappeared. On October 30, Bloomberg Technology reported signs of slowing growth in the core businesses supporting technology giants' collective $750 billion in AI spending this year. Investors are increasingly focused on cash generation, according to Economic Times.

For Alphabet, the unresolved issue is whether adding more ads can improve AI search revenue without leaving a persistent gap against traditional search. Its unchanged annual spending guidance also leaves cash generation under scrutiny, as CNBC reported.

For Microsoft, future results will test whether rapid cloud growth can continue alongside heavy infrastructure investment. The OpenAI revenue disclosure adds another measure to track: how much of Microsoft's growth comes from that relationship, which The Next Web reported already supplies about 11 percent of quarterly revenue.