Amazon (AMZN) Stock; Falls as AWS Margins Become the Key Earnings Test

TLDRs;

• Amazon shares fell 7.4% before earnings as investors focused on AWS profitability rather than overall revenue growth.
• AWS is expected to contribute most of Amazon’s operating income despite representing only about one-fifth of revenue.
• Massive AI infrastructure spending has sharply reduced free cash flow, raising concerns about future cash generation.
• Investors will closely watch whether AWS margins hold near prior levels or weaken under rising depreciation costs.

Amazon.com (NASDAQ: AMZN) is entering one of its most closely watched earnings reports in recent years, with investors placing far more attention on Amazon Web Services than on headline revenue. The company’s shares have fallen sharply ahead of the second-quarter results, reflecting growing concern that heavy artificial intelligence spending could begin to pressure the profitability of its cloud business.

The stock has declined 7.4% over the past five trading sessions, a move that exceeded the swing implied by options markets before earnings. Amazon closed at $226.65 and slipped further in after-hours trading, signaling that investors remain cautious even before the company releases its official numbers on Thursday.

Analysts say the market is no longer looking for a simple revenue beat. Instead, the key question is whether AWS can continue delivering strong profit margins while Amazon accelerates investments in data centers, servers, and AI infrastructure.

AWS Drives Most Profit

Consensus estimates point to second-quarter revenue of about $196.75 billion, while AWS revenue is expected to reach roughly $40.5 billion, representing growth of more than 30% from a year earlier.

Amazon.com, Inc., AMZN

What makes AWS especially important is not its share of sales but its contribution to earnings. The cloud division is projected to account for only about 21% of Amazon’s revenue yet generate nearly 60% of the company’s total operating income. Estimated AWS operating profit stands near $13.7 billion.

That concentration means even a small change in AWS profitability can have an outsized effect on Amazon’s overall results. Analysts estimate that every percentage point change in AWS operating margin is worth roughly $405 million in operating income.

Margin Pressure Concerns

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

If AWS were able to maintain the first-quarter margin, Amazon’s operating income could exceed current forecasts by more than $1.5 billion. The risk is that rising depreciation expenses tied to AI infrastructure could push margins lower.

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

Investors are increasingly asking whether Amazon can expand AI capacity without eroding the economics that have historically made AWS the company’s most valuable business.

AI Spending Hits Cash Flow

The concern is not limited to margins. Amazon’s free cash flow has weakened dramatically as the company spends heavily on equipment and infrastructure.

Trailing twelve-month operating cash flow rose about 30% to $148.5 billion, showing that the core business continues to generate substantial cash. Free cash flow, however, fell to just $1.2 billion from $25.9 billion previously.

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

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

The market appears willing to tolerate aggressive spending only if AWS continues to produce exceptional growth and stable margins.