Platform Ad Revenue

Why traders and investors watch this

GOOGL, META and AMZN are three of the S&P 500's largest weights, and the advertising line is the swing number in two of those earnings reports — the growth rate printed here is what the stocks (and, through index concentration, the S&P itself) reprice on. The market trades the year-over-year rate and its second derivative, not the dollar level: Q4 is always the biggest quarter, so sequential moves mislead. Ad budgets are also early-cycle spending — cut before headcount when growth wobbles — which makes this page a quarterly read on marketing demand from the companies that collect most of it. The one caveat that never goes away: TikTok, the biggest share-taker of recent years, is private and reports nothing, so slowing growth at the public platforms can mean weak demand or lost share, and filings alone cannot tell you which.

How this is computed — and what it can't tell you

Every figure is a tagged XBRL fact from a 10-Q or 10-K: we parse each filing's instance document and select revenue facts carrying the company's advertising-segment member (for example, Alphabet's GoogleAdvertisingRevenueMember). Fourth quarters are derived as the full-year figure minus the nine-month year-to-date figure, since 10-Ks report only annual totals. Numbers appear here when the SEC filing is made — for the largest companies that is the same day as the earnings release; smaller filers lag by days to two weeks.

Limits worth knowing: platforms define "advertising" slightly differently (Amazon's line excludes some ad-adjacent revenue; Pinterest reports no split at all, so its total revenue stands in, labeled). Segment definitions occasionally change — when a company re-tags its filings, this page reflects the restated history. TikTok, the largest absent player, is private and files nothing.