Amazon's Cloud Grew 39%, but the Stock Fell in Alphabet's Wake

Alphabet fell about 12% on October 29. It was the stock's steepest drop since its 2004 IPO and erased roughly $500B in market value, by Yahoo Finance's calculation.

That evening Amazon reported earnings. Its cloud unit kept growing at the fastest pace in five years, and its operating margin hit a record. Even so, the stock slid as much as 10% in after-hours trading.

AWS Accelerated and Operating Profit Hit a Record

AWS revenue rose 39% to $46.0B, above the $45.3B StreetAccount estimate cited in reports. The unit's operating income was $17.8B, a 38.7% margin.

Total operating income climbed from $17.4B to $28.1B. Amazon called its 13.9% operating margin the highest in its history.

Total revenue, however, came in at $201.9B against a reported LSEG estimate of $202.3B. Earnings per share were $1.89 versus the $1.96 expected. Last year's profit included a $9.5B gain on Amazon's Anthropic investment.

Spending Nearly Doubled Operating Cash Flow

Amazon spent $77.3B on buildings, servers and equipment in the quarter. A year earlier, the same quarter's figure was $35.1B. Operating cash flow was $42.4B.

Over twelve months, operating cash flow was $168.3B and net capital spending $210.7B. The gap is negative $42.4B of free cash flow. Amazon kept its 2026 spending target of about $220B.

In July, AWS had grown 37%, Amazon raised its spending target to $220B, and the stock jumped 7% after hours. That day the market read the spending as a growth signal. Tonight it read the same spending as a cash problem.

Today's Server Becomes Tomorrow's Expense

Capital spending does not hit the income statement all at once. A server turns into expense piece by piece over its useful life; that expense is depreciation. The math below is simplified, since buildings last longer than servers.

That is why the market is watching whether growth keeps pace with spending, not the growth rate alone. CEO Andy Jassy said Amazon projects AWS growth above 40% in both 2027 and 2028. The math only works if that pace holds.

Alphabet's Loss Split the Indexes

Alphabet's one-day loss was the second-largest ever for a US-listed company, behind Nvidia's roughly $593B drop on January 27, 2025. In its October 28 report, Alphabet posted free cash flow of negative $9.1B.

The direction of the selling shows up in the index closes. Money left big tech and moved into small caps and defensive sectors.

According to Yahoo Finance, investors rotated into health care, financials and real estate. That kind of sector rotation limited the broader index decline. The Nasdaq 100 fund's past month shows the backdrop:

What It Means for Investors

• The market priced how the cloud acceleration is consuming cash, not the acceleration itself; Microsoft, with positive cash flow, got through the day with smaller losses, per Yahoo Finance.
• Continued spending supports orders at suppliers such as Nvidia, Broadcom and Micron, while the buyers' shares are under pressure.
• Amazon guided fourth-quarter operating income to $28.5B-$33.5B; a result below the low end would suggest depreciation is catching up with profit.
• The risk to the thesis is slower growth: if AWS grows less than 40% in 2027, the return on the spending narrows.

This story is based on Amazon's October 29, 2026 earnings release. Analyst estimates are figures ShiftDelete cited from CNBC, LSEG and StreetAccount. The after-hours move comes from Motley Fool and Yahoo Finance reports and ranges between 6% and 10% across sources. Alphabet's market value loss is a Yahoo Finance calculation. Index closes are Yahoo Finance data. The depreciation example rests on a simplified assumption and is not a figure the company disclosed.