Amazon.com (NASDAQ: AMZN) is approaching one of its most closely scrutinized earnings reports in recent memory, with investors placing far greater weight on the profitability of Amazon Web Services than on the company's headline revenue figures.

The stock has declined 7.4% over the past five trading sessions heading into the second-quarter results, a drop that exceeded the swing implied by options markets before the report. Amazon closed at $226.65 and slipped further in after-hours trading, an indication that investors remain cautious even before the company releases its official numbers on Thursday.

Analysts note that the market is no longer satisfied with a straightforward revenue beat. The central question now is whether AWS can sustain its robust profit margins while Amazon ramps up capital investments in data centers, servers, and AI infrastructure. The scrutiny is not unique to Amazon — Microsoft, Alphabet, and Meta have all faced similar investor pressure as they collectively commit tens of billions of dollars to AI infrastructure, but Amazon's report carries particular weight because AWS remains the largest cloud provider by revenue.

AWS as the Primary Profit Engine

Consensus estimates project second-quarter revenue of approximately $196.75 billion. AWS revenue alone is expected to reach roughly $40.5 billion, which would represent year-over-year growth exceeding 30%.

What makes AWS particularly significant to investors is not its share of total sales but its outsized contribution to earnings. The cloud division is projected to account for only about 21% of Amazon's revenue, yet it is expected to generate nearly 60% of the company's total operating income. Estimated AWS operating profit stands near $13.7 billion.

This concentration means that even a marginal shift in AWS profitability can have a disproportionate effect on Amazon's overall financial results. Analysts estimate that each percentage point change in AWS operating margin corresponds to roughly $405 million in operating income. By contrast, Amazon's retail operations typically run on comparatively thin margins, making the cloud division's profitability the single most important variable in the company's consolidated earnings power.

Margin Pressure Under AI Investment Scrutiny

AWS operating margin reached 37.7% in the first quarter, a level that surprised many investors and helped support Amazon's share price earlier this year. Current consensus expectations, however, place the second-quarter margin closer to 33.8%.

If AWS were to maintain its first-quarter margin level, Amazon's operating income could surpass current forecasts by more than $1.5 billion. The risk investors are focused on is that rising depreciation expenses tied to AI infrastructure investments could push those margins lower.

The cloud business has been benefiting from growing demand for generative AI services, model training, and enterprise computing workloads. However, those same growth opportunities require enormous capital expenditure, creating tension between expansion and profitability.

Investors are increasingly evaluating whether Amazon can scale its AI capacity without eroding the unit economics that have historically made AWS the company's most valuable business segment. Competing cloud providers face the same calculus, but Amazon's scale means its margin trajectory is widely treated as a bellwether for whether the industry's AI buildout can translate into sustained profits.

AI Spending Weighs on Free Cash Flow

The concern extends beyond margins. Amazon's free cash flow has weakened dramatically as the company directs heavy spending toward equipment and infrastructure.

Trailing twelve-month operating cash flow rose approximately 30% to $148.5 billion, demonstrating that the core business continues to generate substantial cash. Free cash flow, however, plummeted to just $1.2 billion, down from $25.9 billion in the prior comparable period.

Amazon has attributed much of this decline to a roughly $59.3 billion increase in equipment spending related to AI expansion.

This capital expenditure shift has become a major focus for both equity and credit investors. Demand for Amazon's recent bond offerings has been weaker than earlier in the year, an indication that financing large-scale infrastructure growth is becoming more expensive.

The market appears willing to tolerate Amazon's aggressive spending trajectory only if AWS continues to deliver exceptional growth alongside stable margins. With Thursday's report, investors will be looking for signals on whether the gap between AI-related capital outlays and corresponding revenue is narrowing — or whether the investment cycle still has years to run before the returns become visible in AWS profitability.