Meta description: Amazon shares jumped as much as 15% — its biggest single-day gain in over a decade — after AWS growth and a raised $220 billion capex outlook convinced investors its AI bet is working.
Thursday night's initial 9.4% after-hours pop for Amazon turned out to be just the beginning. By the time Friday's regular session closed, Amazon shares had jumped nearly 13%, extending to over 15% by the end of the trading day — the company's biggest single-day increase in more than a decade. The move offered the clearest signal yet that Amazon's enormous AI infrastructure bet is starting to convince skeptical investors.
A capex increase that got rewarded, not punished
In a striking departure from the pattern that sank Alphabet and Meta earlier this earnings season, Amazon's management raised its 2026 capital-expenditure outlook to approximately $220 billion, primarily reflecting continued investment in AWS and AI infrastructure — and the market cheered rather than recoiled. Despite that elevated spending, Amazon posted a record operating margin of 13.7%, giving investors concrete proof that heavier AI investment and improving profitability aren't mutually exclusive.
Why this reaction broke the pattern
This earnings season has repeatedly shown that markets are punishing capex increases unless they arrive alongside clear evidence of payoff. Amazon delivered exactly that combination: AWS growth accelerating to its fastest pace in 18 quarters, record advertising contribution, and now a record operating margin even as spending rises. Where Alphabet's raised capex forecast triggered a selloff and Meta's spending ate into free cash flow, Amazon's results gave investors the rare full package — growth, margin expansion, and heavier investment, all at once.
A sharp contrast with Apple the same night
The divergence with Apple, which fell as sharply as Amazon rose (covered in our companion post), could hardly be more pointed. Both companies reported the same evening; one delivered a decade-best rally while the other suffered one of its worst post-earnings reactions in years. The split reinforces a theme we've tracked across this entire earnings season: investors are evaluating each company's AI story individually and often unforgivingly, rather than applying a uniform reaction to "Big Tech" as a category.
What this means for the broader AI trade
Amazon's reaction arrives at a pivotal moment for sentiment around AI infrastructure spending broadly. Coming in the same week as Microsoft's record $450 billion single-day gain, Amazon's rally adds a second major data point suggesting that, when megacap AI spenders can show tangible operational payoff, markets are willing to reward heavy capital expenditure rather than punish it — a meaningfully different mood than the skepticism that dominated just two weeks earlier.
What investors should watch
- Whether AWS growth can sustain its accelerated pace in coming quarters as the $220 billion capex plan rolls out
- Operating margin trends, to see if the record 13.7% level proves durable as spending continues to rise
- Whether other AI infrastructure spenders can replicate Amazon's combination of growth, margin expansion, and rising capex
- How Amazon's rally holds up after such an extraordinary single-day move
Bottom line
Amazon's best trading day in over a decade shows that the market's skepticism toward AI spending isn't absolute — it's conditional on results. By pairing a bigger capex commitment with record margins and accelerating growth, Amazon gave investors exactly what they'd been demanding from megacap AI spenders all month, and they rewarded it in historic fashion.
This post is based on reporting from the Associated Press and Edward Jones as of July 31, 2026. This content is for informational purposes only and does not constitute investment advice.
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