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Digital Advertising

Leader: Google — 23.9% S1 · 62.1% CR3

S1
23.9%
leader
CR3
62.1%
top 3 combined
HHI
1,308
Unconcentrated
MARKET SIZE
$280B
US

How this is calculated

FORMULA
S1 = Google us digital ad revenue / total us digital ad revenue = 23.9%
CR3 = Google + Meta + Amazon = 62.1%
HHI = Σ(share²) = 1,308 (Unconcentrated (HHI < 1,500))
DENOMINATOR
US Digital Ad Revenue — $280B (US)
Total US digital advertising spend across all channels (search, social, display, video, retail media).
Size from: eMarketer US Digital Ad Spending
TOP 3 PLAYERS
#1Google23.9%
#2Meta20.9%
#3Amazon17.3%
METHODOLOGY NOTE
Google's share of total US digital ad revenue per eMarketer. Refreshed May 2026 to eMarketer 2026 forecast — Amazon's retail-media business has solidified the triopoly: Google 23.9% / Meta 20.9% / Amazon 17.3%. Each of Google and Meta has shed ~1-2pp of share to Amazon over the past 2 years. Validated against IAB's Internet Advertising Revenue Report and Alphabet/Meta/Amazon segment disclosures.
SOURCES
Year: 2025
Geo: US
Firms: 10

Historical S1 / CR3 trajectory

2000S1: 5%CR3: 25%Pre-Google dominance
2005S1: 25%CR3: 45%Google surging
2010S1: 33%CR3: 58%Google + Yahoo
2015S1: 35%CR3: 62%Google + Facebook duopoly
2020S1: 28%CR3: 63%Amazon emerges as 3rd
2025S1: 25.8%CR3: 60.8%Triopoly stable

Labor economics

REV / EMPLOYEE (leader)
$1.7M
industry avg $1.2M
SG&A % (leader)
12%
of revenue

Alphabet FY2025 (parent-level); platform-leveraged ad monetization

See full Labor & AI analysis →

Related markets

Search Engines
Google
84.1%
CR3 97.5%
Social Media
Meta (FB+IG)
42.0%
CR3 75.0%
E-commerce
Amazon
40.5%
CR3 50.5%
Web Browser
Chrome
65.1%
CR3 88.5%
Mobile OS
Android
72.8%
CR3 100.0%

Source Quality Hierarchy

Every market has a primary source plus 1–3 validation sources. Revenue numerators come from SEC 10-K filings; denominators validated against the Economic Census where available.

TIER 1Authoritative anchorsGovernment data + SEC filings
US Economic Census (data.census.gov) · SEC EDGAR / Company 10-Ks · BEA Industry Value-Added (FRED) · BLS QCEW · USGS Mineral Commodity Summaries · EIA Refinery Capacity Report · FDA device listings
TIER 2Leading commercial trackersIndustry-standard paid trackers
IDC Semiannual Software Tracker · Gartner Market Share & Magic Quadrant · IBISWorld NAICS reports · StatCounter Global Stats · eMarketer / Insider Intelligence · Synergy Research Group
TIER 3Category specialistsBest-in-class niche authorities
SIPRI (aerospace & defense) · IQVIA (pharma) · TrendForce (semiconductors) · CIMdata (CAD/PLM) · Nilson Report (payments) · Am Law 100 (legal) · ENR Top 500 (A&E) · AM Best (insurance) · SIA (staffing) · Ad Age (agencies) · Barron's / Cerulli (wealth) · Evaluate MedTech · Nielsen Gauge (streaming) · Gridwise (ride-hail) · Bloomberg Second Measure (delivery) · RC Top 100 (roofing) · SDM Top 100 (fire/safety) · Big 4 annual reports · ALM Intelligence (consulting)

Data vintage: Q2 2025 research compilation. Labels updated 2026-Q2. Tier 1 sources refreshed from FY2025 SEC filings where available. For full methodology see the Methodology page.