Major ClientsWide moat

Alphabet (Google) (GOOGL) — moat facet

Millions of advertisers and no client worth naming — until one AI lab quietly became more than 40% of the cloud backlog, and Alphabet turned out to own 14% of it.

For most of its life Alphabet had the same customer profile as Apple: revenue from so many buyers that no single one mattered. Advertising still supplies roughly three-quarters of revenue1, spread across millions of advertisers from global brands to a plumber buying local keywords, and Alphabet's annual report carries no customer-concentration disclosure at all — there is nothing to disclose.

Two customer bases, opposite propertiesAdvertisers: $294.7B in 2025Millions; none disclosed; no contractsCloud backlog$242.8B (Dec 2025) to $514B (Jun 2026)Anthropic~$200B commitment; reported >40% of backlogPaid out instead$59.9B of traffic acquisition costsAlphabet also owns ~14% of Anthropic, its largest cloud customer and a Gemini competitor
The advertising base is the safest customer structure in this app; the cloud base is quietly one of the most concentrated. Both belong to the same company.

The cloud business changed that, and faster than almost anyone noticed. Alphabet ended 2025 with $242.8 billion of revenue backlog, principally Google Cloud2. Within six months that figure had roughly doubled, and the largest single reason is one customer: Anthropic committed an estimated $200 billion over five years to Google Cloud and TPU capacity, a deal reported to represent more than 40% of the entire cloud backlog3.

So Alphabet now has two customer bases with opposite properties. The advertising base is atomised, uncontracted and cyclical — nobody can negotiate, and everybody can leave in a recession. The cloud base is contracted, enormous and dangerously concentrated in a handful of AI laboratories whose own revenues are speculative. One of those laboratories is a company Alphabet owns roughly 14% of and competes with directly.

That last fact is why this page exists. Alphabet's paper gains on Anthropic have at times exceeded the profits of its actual business4. The pages that follow take the advertising base, the cloud backlog, and the Anthropic relationship in turn — a relationship that is simultaneously the largest customer, one of the largest investments, and one of the more serious competitive threats this company faces.

Moat trajectory: Holding steady

The advertising base remains the same enviable structure it has always been — millions of buyers, no concentration, no negotiation. What is new is a second customer base with the opposite properties: contracted, enormous, and concentrated in AI labs. Net stable, because the diversification of the whole is improving even as the cloud half concentrates.

The number that tests this moat
Reported
Largest customer's reported share of the cloud backlog
More than 40% (Anthropic, ~$200B commitment)

Advertising has millions of buyers and nothing to disclose; the cloud backlog is concentrated in one AI lab Alphabet also part-owns. A falling share would mean the backlog is diversifying; a rising one, that Cloud's growth depends more on one customer.

Source: Anthropic announcement; Alphabet Form 10-K, FY2025 (backlog $242.8B) ↗
Dig deeper
DIG DEEPER 01
Millions of Advertisers, None That Matters
No advertiser can negotiate Google's take, because the price of a click is set by rival bidders rather than by a procurement department.
DIG DEEPER 02
The Cloud Backlog and What Filled It
A backlog built from millions of enterprises is the safest revenue in technology; one where a single AI lab is 40% is closer to a very large loan.
DIG DEEPER 03
Anthropic: Client, Investment and Rival
Largest cloud customer, 14%-owned investment, and direct Gemini competitor — three relationships whose paper gains have swamped the real business.
DIG DEEPER 04
The Partners Google Pays Instead
Alphabet's biggest counterparties by dollar value are the ones it pays — $59.9 billion in 2025 to stand where the users already are.
References
  1. ReportedAdvertising supplies roughly three-quarters of Alphabet's revenue.
    Google advertiser-base disclosures — millions of businesses advertise on Google; no single advertiser is material to revenue (Form 10-K risk factors / Economic Impact reports) — Ongoing · source ↗
  2. ReportedRevenue backlog was $242.8B as of December 31, 2025, primarily Google Cloud.
    Alphabet Form 10-K, FY2025 — "As of December 31, 2025, we had $242.8 billion of remaining performance obligations ('revenue backlog'), primarily related to Google Cloud"; revenue backlog represents commitments in customer contracts not yet recognised as revenue. Traffic acquisition costs (TAC) of $54,900 million for 2025; Google Cloud revenue $43,229 million — FY2025 · publ. February 2026 · source ↗
  3. ReportedAnthropic committed an estimated $200B over five years for Google Cloud and TPU capacity — reported as more than 40% of the cloud backlog.
    Anthropic — expanded partnership with Google (and Broadcom) for multiple gigawatts of next-generation compute; reported as an estimated $200B commitment over five years for Google Cloud and TPU capacity, with market coverage placing it at more than 40% of Google Cloud's total revenue backlog — 2026 · publ. May 2026 · source ↗
  4. ReportedPaper gains on Anthropic and SpaceX added roughly $98B to Q2 2026 net income.
    Fortune — Alphabet's stake in Anthropic (roughly 14%, from an initial $300M investment in 2023) produced unrealised gains that, with SpaceX, added roughly $98B to Q2 2026 net income of $112.1B — paper gains at times exceeding the operating business's profits — Q2 2026 · publ. July 2026 · source ↗
Sources
Generated September 16, 2026