Millions of Advertisers, None That MattersWide moat

Meta's 10-K contains no customer-concentration disclosure of the sort that dominates the filings of the chip companies elsewhere in this collection, because there is nothing to disclose. Revenue arrives from millions of advertisers, none large enough to matter individually.

The structural consequence is pricing power of an unusual kind. Meta does not set its ad prices; an auction does, and the auction's price is whatever the second-highest bidder will pay. Adding advertisers therefore raises prices mechanically, without a negotiation, a discount schedule or a salesperson. In 2025 the company delivered 12% more ad impressions at 9% higher average prices¹ — more supply and higher prices at the same time, which is only possible when demand is growing faster than inventory.

The cost of this structure is that none of it is contracted. There is no backlog, no multi-year commitment, no switching cost beyond the campaigns an advertiser has already tuned. Every dollar must be won again next quarter, which is why advertising revenue reacts so quickly to economic weather.

Watch price per ad rather than revenue. Revenue can grow on impressions alone, which is a volume business. Price rising is the evidence that advertisers are competing with each other for Meta's inventory — and that is the moat, stated as a number.