Amazon reported its largest quarterly revenue growth in more than four years, and the market responded the way markets do when existential fears get resolved: it bought everything in sight.

The numbers that moved markets

AWS posted revenue growth of 37% year-over-year, clearing analyst expectations of around 31% by a wide margin.

Amazon shares jumped over 15% in the session following the report.

The company also raised its full-year capital expenditure guidance to $220 billion, an increase of $20 billion from prior projections, with nearly all of that incremental spending earmarked for AI infrastructure.

CEO Andy Jassy’s commentary during the earnings call directly addressed the concern that had been stalking tech stocks all month: whether AI spending was a rational investment or an expensive bet with no clear return timeline. Jassy’s answers, paired with the AWS numbers, were apparently sufficient to put that debate to rest, at least for now.

Why this matters beyond Amazon

Microsoft reported similarly strong results earlier in the same week, adding another data point to what is becoming a coherent narrative: the major cloud platforms are not just spending on AI, they are beginning to monetize it at scale.

The S&P 500 and Nasdaq were both up approximately 9% year-to-date as of late July 2026.

Apple’s results offered a counterpoint, with the company reporting disappointing figures during the same earnings window.

What investors should watch from here

The decentralized AI and compute sector had already been dealing with GPU scarcity driven by hyperscaler demand. If Amazon and its peers continue to absorb chip supply at the rate their capex forecasts imply, projects operating at the intersection of AI and blockchain infrastructure could face tightening conditions.

The 37% AWS growth figure is exceptional by any standard. The company’s $220 billion capex commitment signals confidence, but a single quarter of weaker-than-expected cloud revenue growth, set against that spending backdrop, could reverse some of Thursday’s enthusiasm quickly.

The narrative that AI spending was disconnected from near-term returns has now taken two significant hits in one week, from Microsoft and Amazon. The next round of evidence will come from the following quarter’s cloud metrics.