Amazon Stock Guide: AWS, E-Commerce, Advertising and AI CapEx Explained

Amazon, traded as AMZN on the Nasdaq, is a portfolio of businesses with very different economics. Retail generates most of the revenue, AWS is the largest disclosed profit engine, and advertising adds a fast-growing, capital-light layer on top of Amazon's commerce ecosystem. The central analytical question is whether heavy AI infrastructure spending continues to translate into durable AWS growth and stronger operating cash generation over time.

The most useful way to understand Amazon is that its revenue engine and its profit engine are different things. Most of its sales come from retail: online stores, its third-party marketplace where outside sellers list products, physical stores, and Prime subscriptions. But those retail businesses run on thin margins. The profit comes disproportionately from two smaller but far more profitable arms, AWS and advertising.

Amazon's second quarter of 2026 is a useful current example of that mix. Net sales reached $200.6 billion, up 20% year over year, while AWS sales rose 37% to $42.2 billion. The quarter should be treated as a snapshot rather than a permanent run rate, but it shows why revenue mix matters: the much smaller AWS segment generated $16.6 billion of operating income, about 60% of Amazon's consolidated operating income. Primary source

For the broader big-tech context, see MEXC's published Mag 7 guide

AWS, or Amazon Web Services, is the company's cloud computing business, renting out servers, storage, and software to other companies. It is the single most important driver of Amazon stock, because it is the profit engine. In the second quarter of 2026, AWS was about 21% of Amazon's revenue but generated roughly 60% of its operating income. That gap sums up why investors watch cloud growth far more closely than retail growth.

The latest quarter illustrates the scale of the cloud engine. AWS revenue grew 37% year over year to $42.2 billion and its operating margin was about 39%. Amazon also continues to build custom silicon such as Trainium as part of an effort to lower the cost of AI workloads. The durable question is not whether one quarter is strong, but whether AWS can sustain growth while preserving attractive unit economics as infrastructure spending rises.

Even though retail is the lower-margin part of Amazon, it is far from unimportant. It is the foundation that everything else is built on. The online stores, the third-party marketplace, and Prime subscriptions together create an enormous base of customers and shopping activity, and that activity is what makes the more profitable businesses possible.

The connection is direct. Prime keeps customers loyal and shopping often, the marketplace draws millions of sellers who pay fees and buy fulfillment services, and all that shopping generates the data and traffic that Amazon's advertising business monetizes. In the second quarter of 2026, Amazon's North America retail segment ran at about a 7.9% operating margin, healthy for retail, while worldwide paid units grew 17%. So retail is not weak revenue; it is the ecosystem engine that feeds the high-margin arms. The trade-off is that it carries heavy costs, from warehouses to shipping, which is why its margins stay slim.

Advertising is Amazon's quiet powerhouse. It has grown into a business generating around $76 billion over the trailing twelve months, larger than many standalone media companies, and it is expanding faster than Amazon overall. In the second quarter of 2026, advertising revenue grew 26% from a year earlier to about $19.8 billion.

What makes it so valuable is that it sits on top of shopping intent. When someone searches for a product on Amazon, a sponsored placement reaches them at the moment they are ready to buy, which advertisers pay a premium for. It also extends into Prime Video ads and live sports. Crucially, advertising is far less capital-intensive than either retail fulfillment or cloud infrastructure, so it carries high margins and lifts Amazon's overall profitability. That also places Amazon in direct competition with larger digital-advertising platforms, but its advantage is distinct: it monetizes high-intent commerce activity rather than primarily search or social engagement.

Here the story shifts from strength to tension. Capex, short for capital expenditure, is money spent on long-lived assets like data centers, servers, and chips, and Amazon's has surged. Management raised its 2026 capital spending plan to about $220 billion, up from an earlier $200 billion, citing higher memory prices and strong demand, as Reuters reported. Most of that goes toward AI infrastructure for AWS. For the broader spending framework, see MEXC's published AI CapEx guide

The tension is what this does to cash. Amazon generated about $161 billion in operating cash flow over the trailing twelve months, a huge sum. But its heavy investment pushed free cash flow, the cash left after that spending, to an outflow of roughly $7.6 billion, down from a large positive figure a year earlier. Evidence supporting the spending case is that AWS demand remains strong and management continues to describe capacity as constrained. Evidence weakening it would be persistently high capital intensity without corresponding improvement in AWS growth, operating income, or free cash flow. This is the central financial tension around the stock.

Because Amazon is several businesses at once, a handful of numbers tell most of the story each quarter.

One caution belongs with any look at Amazon's profits. In the second quarter of 2026, its net income of about $62.6 billion was inflated by a one-time gain of roughly $53 billion from revaluing its investment in the AI company Anthropic. That is an accounting gain, not money earned by running its businesses, so the headline profit looked far larger than the underlying operations produced. That is why operating income and cash flow are more useful than headline net income when a large non-operating revaluation gain is present.

The clearest risk is concentration. Because AWS generates around 60% of Amazon's operating income, any slowdown in cloud growth, pricing, or margins would hit the company's profits hard, even if retail holds up. The whole profit story leans heavily on one segment.

Several other risks sit alongside it. Heavy AI capex keeps free cash flow under pressure and could stay elevated for years, so the payoff depends on that spending earning strong returns. Retail costs, from shipping to wages, can rise faster than revenue and squeeze already-thin margins. Amazon faces intense competition on every front, from Walmart in retail to Microsoft and Google in cloud, and Google and Meta in advertising. And as one of the largest companies in the world, it draws regulatory and antitrust scrutiny that could raise costs or limit its expansion.

The useful way to frame Amazon is to define what evidence would strengthen or weaken the current business thesis. The same AWS growth, retail efficiency, advertising scale, and capital spending can point in different directions depending on whether returns on that spending keep improving.

The most useful way to evaluate the evidence is to watch whether Amazon's AI spending translates into durable AWS growth and, over time, stronger free cash flow. If cloud demand and operating income keep scaling as new capacity comes online, the spending is being validated by the business. If AWS growth or pricing weakens while capital intensity stays high, the same spending becomes a larger pressure on cash returns.

Amazon is one of the major U.S.-listed companies spanning cloud computing, e-commerce, advertising, and AI infrastructure. Current Real U.S. Stock availability on MEXC can be checked at Stock. Product access varies by region, so the live market page should be treated as the source of truth.

Amazon earns most of its revenue from retail, including online stores, its third-party marketplace, and Prime subscriptions. But most of its profit comes from two smaller, higher-margin businesses: AWS cloud computing and advertising.

AWS is Amazon's cloud computing arm and its main profit engine. In the second quarter of 2026 it was about 21% of revenue but roughly 60% of operating income, so its growth and margins drive much of the stock's value.

Amazon's advertising business generates around $76 billion over a trailing twelve-month basis and grew 26% in the second quarter of 2026. It is high-margin because it monetizes shopping intent and needs far less capital than retail or cloud.

Amazon raised its 2026 capital spending to about $220 billion, mostly for AI infrastructure. That heavy investment pushed trailing free cash flow to an outflow, even though the underlying business still generated strong operating cash flow.

Amazon is a major AI infrastructure company through AWS, which rents computing power for AI, alongside its retail and advertising businesses. Its AI exposure runs through cloud demand and heavy infrastructure spending rather than selling chips directly.