Stock Market July 31 2026: Amazon Soars, Apple Sinks

Wall Street closed the book on a turbulent July with a session that captured the year’s central question in two stocks. On Friday, July 31, 2026, the S&P 500 rose 0.7%, the Dow Jones Industrial Average added 0.5%, and the Nasdaq Composite climbed 1% — modest headline numbers that hid a violent split beneath the surface. Amazon surged roughly 13%, its biggest single-day gain in over a decade, while Apple tumbled about 7%, its worst day in more than a year. Both companies had beaten earnings estimates the night before. The market rewarded one and punished the other for the same reason: the artificial-intelligence boom.

Two megacaps, opposite verdicts

The divergence was not about who had the better quarter. Both did well. It was about which company the AI buildout is lifting and which one it is starting to squeeze.

Amazon delivered exactly the print the market had been waiting for. As detailed in its Q2 2026 earnings, the company crossed $200 billion in quarterly revenue for the first time in its history, and — the number that mattered most — Amazon Web Services grew 37% year over year, its fastest rate in five years, reaching $42.2 billion for the quarter against expectations near $40.5 billion. CEO Andy Jassy told investors the company now expects capital spending to reach roughly $220 billion this year, a figure that would have read as alarming in a different season but now reads as confirmation that AI demand is real and accelerating. The stock, which jumped as much as 10% in after-hours trading Thursday, extended the move through Friday to close up double digits.

Apple’s quarter was, by the numbers, a record. The company reported fiscal Q3 revenue of $109.4 billion, up 16.4% year over year and comfortably ahead of consensus, led by iPhone at $54.25 billion and Services at a record $30.74 billion. And yet the stock fell hard. Two things did the damage. First, Services — Apple’s highest-margin business and the engine of its valuation — set a record but missed analyst forecasts, reviving the worry that its growth is decelerating. Second, and more consequentially, Apple’s guidance for the current quarter came in soft.

Apple’s warning is an AI story

The detail that turned a beat into a selloff was Apple’s own explanation for its cautious outlook. Management guided the September quarter to 9–11% revenue growth, below Wall Street’s hopes, and pinned the shortfall on two structural forces — and both of them are downstream of the AI boom.

CEO Tim Cook told analysts the constraint is not a supplier problem but a supply problem created by AI demand vacuuming up components. The mechanics are specific. DRAM production is being reallocated to AI data centers at scale — by some estimates roughly 70% of memory-chip output in 2026 is being consumed by AI infrastructure — which drives up the cost and tightens the availability of the memory Apple needs for iPhones and Macs. At the same time, TSMC’s most advanced process nodes are reportedly sold out through at least 2027 to satisfy AI-chip orders, leaving less leading-edge capacity for everyone else. Cook confirmed that Apple has now absorbed rising memory costs for three consecutive quarters and expects the September quarter’s costs to be higher still.

In other words: the same memory supercycle that is minting record profits for memory makers and lifting the hyperscalers is now showing up as a cost line on Apple’s income statement. The AI trade did not skip Apple. It reached the company from the wrong side of the ledger.

A fitting end to a wild month

Friday’s split was a microcosm of the month that produced it. July was one of the most volatile stretches the AI-hardware complex has seen. The month included a sharp Nasdaq correction driven by a memory-led rout, as investors briefly convinced themselves that hyperscaler AI spending had peaked and that a memory supply glut was forming. Days later, the same names staged one of their biggest rallies in years: the July 30 chip rally sent the semiconductor index up more than 8% in a single session on the strength of strong cloud earnings from Microsoft and record memory sales from Samsung. Earlier in the week, South Korea’s KOSPI had jumped nearly 18% on a surge in chipmaking stocks as the memory narrative flipped from glut to shortage.

Layered over the AI debate were macro cross-currents. Oil prices spiked on the war with Iran, adding an inflation impulse just as investors were already nervous about whether Big Tech’s enormous AI capital spending will ever convert into profits. On Friday itself, bond yields rose as fresh economic data complicated the outlook for interest-rate cuts, pressuring the rate-sensitive corners of the market even as the megacap AI winners powered the indices higher.

Despite the whipsaws, the major indices finished July with gains, closing out a month that lurched up and down almost weekly but ultimately kept faith with the AI trade. The through-line was consistent even when the daily moves were not: capital keeps flowing toward the companies selling and building AI infrastructure, and away from those whose costs the buildout raises without a matching revenue offset.

Winners and losers of the AI capex era

Friday drew the dividing line as clearly as any session this year.

• The infrastructure sellers win. Amazon, alongside the other cloud providers and the chip and memory suppliers beneath them, is monetizing the buildout directly. AWS growth reaccelerating to 37% is the cleanest evidence yet that enterprise AI demand is translating into cloud revenue, and the market paid up for it without hesitation.
• The hardware consumers are exposed. Apple designs world-class silicon but still has to buy memory and rent advanced foundry capacity in a market where AI buyers outbid everyone. When the inputs your products depend on are the same inputs the AI boom is hoarding, scale becomes a liability at the margin, not just an advantage.
• The macro overhang persists. Rising yields and an oil-driven inflation scare are a reminder that the AI trade does not run in a vacuum. A higher-for-longer rate path pressures the very valuations that AI optimism has inflated.

What it means

The AI trade has a supply side, and it cuts both ways. For most of 2026 the market has treated AI as a demand story — who is spending, who is winning cloud share, whose capex is biggest. Apple’s quarter introduces the other half of the equation: the buildout consumes finite physical inputs, and the companies that need those same inputs for non-AI products are now paying for the boom. That reframing matters beyond Apple. Any hardware maker that competes with data centers for DRAM, advanced packaging, or leading-edge wafers carries the same hidden cost, and earnings season will keep surfacing it.

Amazon’s number strengthens the bull case, but does not settle it. A 37% AWS reacceleration and a $220 billion capex guide are exactly what the buildout’s defenders needed after a month of glut fears. Yet the same figure that thrills investors — record capital spending — is precisely what the bears point to when they argue the returns cannot justify the outlay forever. One strong quarter reaccelerating cloud growth is a powerful data point; it is not the verdict.

What to watch next. Three signals into August. First, whether other consumer-hardware and industrial names echo Apple’s AI-driven cost warning — if the memory and foundry squeeze is broad, it will show up across the sector, not just in Cupertino. Second, DRAM contract pricing, the cleanest real-time gauge of whether the shortage Apple flagged is intensifying or easing. Third, the rate path: if yields keep climbing, the macro headwind could do to the AI winners what no earnings miss has managed all year. July ended with the AI trade intact but visibly two-sided. The month ahead will test whether the market can keep rewarding the sellers of the boom without flinching at what it costs everyone else.