Amazon’s (NASDAQ:AMZN) latest earnings highlight the growing tension at the heart of the AI investment boom: the opportunity to generate enormous future revenues from cloud computing and artificial intelligence, against the huge upfront costs required to build the infrastructure.
Shares in Amazon fell around 7% in after-hours trading on Thursday, 29 October, after its Q3 results missed Wall Street expectations and its Q4 revenue outlook disappointed investors.
| Amazon (NASDAQ:AMZN) | Price: $22615 (-7.2% after-hours) | Market cap: $2.63tn |
The reaction was particularly striking because AWS delivered its fastest growth in almost five years. However, investors appeared more concerned about the $220 billion capital expenditure programme, deteriorating free cash flow and the prospect of even higher spending next year.
For UK retail investors, the message is that Amazon’s AI opportunity remains substantial, but the financial returns need to catch up with the investment.
Amazon Q3 2026: the key numbers
| Financial metric | Q3 2026 | Wall Street expectation |
| Revenue | $201.9bn | $202.2bn |
| Revenue growth | 12% | — |
| Earnings per share | $1.89 | $1.97 |
| Operating income | $28.1bn | — |
| Operating margin | 13.9% | — |
| AWS revenue | $46.0bn | $45.6bn |
| AWS growth | 39.3% | 38.2% |
| Advertising revenue | $19.6bn | Below expectations |
Source: Amazon Q3 results, FactSet and market estimates reported by MarketWatch and Reuters. Figures rounded.
The headline results were mixed rather than disastrous. Revenue increased 12% year-on-year, while operating income jumped 61% to $28.1 billion. Amazon also achieved its highest-ever operating margin of 13.9%.
However, net income declined to $20.7 billion from $21.2 billion a year earlier, partly because the previous year’s comparison included substantial investment gains from Anthropic.
The earnings miss was relatively small, but the market was looking for evidence that Amazon could deliver accelerating growth without allowing its AI infrastructure spending to overwhelm shareholder returns.
Why did Amazon shares fall?
There were four main reasons for the negative reaction.
1. Investors were alarmed by the free cash flow deterioration
This was arguably the biggest concern.
Amazon generated $168.3 billion of operating cash flow over the trailing 12 months, up 29%. However, capital expenditure increased much faster, leaving the company with negative free cash flow of $42.4 billion.
Amazon cash flow, trailing 12 months
| Metric | Sept 2025 | Sept 2026 |
| Operating cash flow | $130.7bn | $168.3bn |
| Capital expenditure* | $115.9bn | $210.7bn |
| Free cash flow | $14.8bn | -$42.4bn |
*Purchases of property and equipment, net of proceeds from sales and incentives. Source: Amazon.
The deterioration is substantial: free cash flow has swung by approximately $57 billion in a year.
Importantly, this does not mean Amazon’s underlying operations are suddenly struggling. Operating cash flow is growing strongly. Rather, the company is reinvesting an increasingly large proportion of the cash it generates into data centres, computing equipment and AI infrastructure.
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Nevertheless, investors are becoming less willing to overlook negative cash generation as the AI investment cycle intensifies.
2. The $220 billion capex bill could become even larger
Amazon maintained its expectation of approximately $220 billion in cash capital expenditure for 2026.
That is already an enormous commitment, reflecting investment in AWS infrastructure, AI chips, servers, networking equipment and data centres.
But CEO Andy Jassy delivered a further warning for investors: capital expenditure in 2027 is expected to be ‘meaningfully more’ than in 2026.
This is particularly significant because Amazon is not the only hyperscaler increasing investment. Microsoft (NASDAQ:MSFT), Alphabet (NASDAQ:GOOG) and Meta (NASDAQ:META) are also committing substantial sums to AI infrastructure.
The concern is that spending could continue rising faster than the revenues and profits generated by these investments.
Reuters reported that Evercore ISI analysts had forecast Amazon’s 2027 capex could reach $320 billion, potentially resulting in another year of substantial negative free cash flow. This is an analyst estimate, not company guidance.
3. Advertising growth disappointed
Amazon’s advertising business generated $19.6 billion in revenue, increasing 12% year-on-year.
That was a notable slowdown from 26% growth in the previous quarter and fell short of analyst expectations.
This matters because advertising is an attractive, relatively high-margin business that helps diversify Amazon’s earnings beyond retail and AWS.
Management attributed some of the slowdown to timing factors, particularly Prime Day moving from the third quarter into the second quarter in most major markets.
Jassy expects advertising growth to return to the high teens in Q4. Investors will want to see that recovery materialise rather than assume it is simply a timing issue.
4. Fourth-quarter guidance was not strong enough
Amazon forecast Q4 revenue of $240 billion to $247 billion.
Although this represents growth of 12% to 16%, the midpoint of $243.5 billion was slightly below the approximately $244.5 billion analyst consensus reported by Reuters.
For a company entering the crucial holiday shopping period, investors wanted a more convincing outlook.
The forecast also raised questions about consumer demand, retail margins and whether Amazon can maintain strong profitability while funding its AI expansion.
What did Amazon say about AWS and AI?
There was considerable positive news beneath the disappointing share price reaction.
AWS revenue increased 39.3% to $46 billion, its fastest growth in almost five years.
AWS quarterly performance
| Metric | Q3 2026 |
| Revenue | $46.0bn |
| Year-on-year growth | 39.3% |
| Operating income | $17.8bn |
| Operating margin | 38.7% |
| Annualised revenue run rate | $184bn |
Source: Amazon Q3 earnings release.
AWS operating income increased from $11.4 billion to $17.8 billion, demonstrating that the cloud division remains an exceptionally profitable business.
Jassy was particularly bullish about its prospects, saying:
‘Our AWS investment in functionality and infrastructure is working.’
He also forecast AWS revenue growth of more than 40% in both 2027 and 2028.
This is important because it suggests Amazon believes its AI infrastructure investment is already translating into stronger customer demand and that the growth opportunity extends well beyond the current financial year.
The challenge is timing. Amazon must convert its infrastructure commitments into billable AI and cloud workloads quickly enough to justify the enormous capital outlay.
What was the analyst response?
The initial Wall Street reaction was cautious, with analysts focusing more on cash generation and investment returns than AWS’s headline growth.
Three areas stood out:
- Evercore ISI: Analysts had already been highlighting the possibility of a much larger 2027 investment programme. Their $320 billion capex forecast illustrates how much further spending expectations could rise.
- Investing.com: Senior analyst Jesse Cohen described the results as a ‘double disappointment’, pointing to the combination of weak guidance and deteriorating free cash flow.
- MarketWatch: Its post-results assessment highlighted that AWS’s strong performance was insufficient to offset the revenue and earnings misses, alongside weaker advertising growth.
The key distinction is that analysts are not necessarily questioning whether demand for AI infrastructure exists. They are questioning how much Amazon must spend to capture that demand, and when shareholders will see the financial benefits.
What investors should watch next
| Catalyst | Why it matters |
| 2027 capital expenditure | Could rise materially above $220bn |
| AWS growth | Management is targeting more than 40% growth |
| AWS operating margins | Determines profitability of AI expansion |
| Free cash flow | Evidence that investment is generating returns |
| Advertising growth | Management expects a recovery into the high teens |
| Q4 operating income | Guidance range of $28.5bn–$33.5bn |
Sharesify investor verdict
It’s a mixed outlook. Amazon’s latest results demonstrate why the AI investment trade is becoming increasingly complicated for investors.
On one hand, AWS is growing rapidly, its operating profits are expanding, and management believes demand is strong enough to support more than 40% annual growth over the next two years.
On the other, Amazon is spending at an extraordinary rate, free cash flow has turned deeply negative, and management has signalled that 2027 investment will be even higher.
The biggest concern is not necessarily that Amazon is spending too much, but whether it can generate sufficiently attractive returns on that investment. A $320 billion annual capex bill would leave little room for complacency if AI demand or cloud pricing disappoints.
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Bull case: AWS growth accelerates, AI infrastructure remains capacity-constrained, and today’s investment creates a substantially larger, more profitable cloud business over the next five years.
Bear case: Spending continues to outpace operating cash generation, free cash flow remains negative, and investors begin demanding stronger evidence of returns before awarding Amazon a premium valuation.
For UK investors holding Amazon through a Stocks & Shares ISA or SIPP, the latest results are a reminder that strong AI revenue growth does not automatically translate into stronger shareholder returns.
Many investors will remain positive on Amazon’s long-term competitive position, but the next phase of its investment story needs to demonstrate improving cash returns rather than simply ever-increasing spending.
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