Alphabet Inc. (NASDAQ: GOOGL, GOOG) has retreated 15% from its all-time share price high set in May, as of Sept. 11. Yet the pullback has done little to derail the longer-term momentum behind one of the Magnificent Seven stocks, which has climbed 43% over the past 12 months and 150% over three years — a run that stands out for a company of its massive scale.
The company’s core business remains on solid footing. In the second quarter ended June 30, Google Search posted 17% year-over-year revenue growth, while YouTube delivered a 13% gain in advertising sales, with subscription revenue growing at an even faster clip. But it is Google Cloud — Alphabet’s enterprise-facing AI engine — that has emerged as the primary focus for investors driving the stock’s narrative.
Two figures stand out as most critical to the Alphabet investment thesis right now.
First, Google Cloud revenue surged 82% year-over-year in the second quarter, accelerating from a 63% increase in the first quarter. The division now accounts for nearly 21% of Alphabet’s total revenue, up from just under 11% three years ago.
Second, Google Cloud’s backlog stood at $514 billion as of June 30, up sharply from $462 billion three months earlier. More than half of that total is expected to be recognized as revenue over the next 24 months, signaling robust and sustained demand from corporate customers for the company’s cloud and AI offerings.
Google Cloud has positioned Alphabet as a leading player in the global AI boom. CEO Sundar Pichai told analysts on the company’s Q2 2026 earnings call that momentum is fueled by its integrated AI portfolio spanning chips, models, data, security and agent platforms, all built to work in tandem.
Google Cloud CEO Thomas Kurian has disclosed that Alphabet’s custom Tensor Processing Unit (TPU) business — which powers both AI training and inference workloads — has reached an annualized revenue run rate of more than $50 billion, more than twice the scale of its nearest rival. By comparison, Amazon.com Inc.’s custom chip business, which includes its Trainium AI accelerators and Graviton CPUs, hit a $25 billion run rate in July.
TPU revenue makes up roughly half of Google Cloud’s total quarterly revenue. The in-house silicon also gives Alphabet a clear edge in capital efficiency: the average payback period for its servers is less than two years, and TPU servers break even in half that time. Amazon Web Services’ AI servers have a payback period of just under three years. With a typical server lifespan of about six years, Alphabet’s faster breakeven translates to roughly twice the cash return per server over its lifecycle.
Capital efficiency in AI infrastructure has become a key battleground for cloud hyperscalers, all of which are raising capital to fund data center expansion. Alphabet itself raised $85 billion through a stock offering earlier this year.
Unlike peers that rely heavily on third-party GPUs, Alphabet’s custom TPUs carry lower costs, allowing the company to deploy more computing power for the same capital expenditure budget. Kurian also noted that Alphabet has locked in many of its largest customers with long-term contracts, some stretching five years, giving the company high visibility into future cash returns on new data center and server investments.
Still, the massive AI bet carries notable risks. Alphabet’s capital expenditure totaled $44.9 billion in the second quarter, pushing its free cash flow into negative territory for the first time since the company went public in 2004. Full-year 2026 capex is projected to reach $195 billion to $205 billion.
The ramp-up in data center spending has raised investor expectations, meaning any deceleration in Google Cloud’s revenue growth or backlog expansion could weigh on the share price. The company also has $811 billion in purchase commitments and contractual obligations on its books, most of which are due by 2030. Some investors have raised concerns that Alphabet may be overextending itself on AI spending.
From a valuation standpoint, however, Alphabet shares do not look stretched. The stock trades at 22.1 times forward earnings, or roughly 16 times by some estimates — a discount to Amazon’s roughly 20 times and Microsoft’s roughly 25 times forward earnings.
Bulls argue the valuation is compelling even amid heavy near-term capital spending. Once the initial data center build-out phase matures, and with the capital efficiency advantage of its TPU portfolio, Alphabet is widely expected to return to its historic pattern of generating substantial free cash flow within a few years.
