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COGNITIVE SERVICES
Marketing / Ad Agencies
Leader: Omnicom (incl. IPG) — 16.0% S1 · 34.0% CR3
S1
leader
CR3
top 3 combined
HHI
Unconcentrated
MARKET SIZE
US
How this is calculated
FORMULA
S1 = Omnicom (incl. IPG) revenue / total revenue = 16.0%
CR3 = Omnicom (incl. IPG) + Publicis Groupe + WPP / GroupM = 34.0%
HHI = Σ(share²) = 418 (Unconcentrated (HHI < 1,500))
DENOMINATOR
Revenue — $60B (US)
US advertising agency net revenue.
Size from: Ad Age Agency Report + R3 New Business League
TOP 3 PLAYERS
#1Omnicom (incl. IPG)16.0%
#2Publicis Groupe9.0%
#3WPP / GroupM9.0%
METHODOLOGY NOTE
Omnicom completed its acquisition of Interpublic Group on Nov 26, 2025 — the combined entity (~$25B+ pro-forma global net revenue, ~$9-10B US) is the largest agency holding company in the world. Refreshed May 2026 to reflect the merger; prior data still showed WPP/GroupM as #1, which was stale by 6 months. Publicis Groupe also overtook WPP organically in 2025 per Ad Age (won 56% of new-business wins). New ranking: Omnicom-IPG > Publicis > WPP. Validated against post-merger Omnicom 10-K and Ad Age Agency Report.
Year: 2025
Geo: US
Firms: 20,000+
Labor economics
REV / EMPLOYEE (leader)
$0.2M
industry avg $0.2M
SG&A % (leader)
10%
of revenue
Omnicom (post-IPG merger Nov 2025) — combined entity ~$25B revenue / ~110K employees ≈ $230K/emp; SG&A ~10% non-personnel (personnel costs reported separately at ~65% of revenue, typical for holding companies)
Related markets
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.