Advertising Agencies (United States) — NAICS 541810

1. Overview

An advertising agency dreams up a brand's marketing — the campaign idea, the words and images, the strategy for where it runs — and often arranges to place that advertising across media. The classic image is the "Mad Men" creative shop, but the modern reality is broader: strategy, creative production, media planning and buying, campaign measurement, data analytics, digital and social content, video, influencer programs, and technology services now sit alongside the traditional 30-second spot [1].

Two things make this industry worth understanding. It is the machinery that turns brand budgets into sales, so it is a direct, high-frequency read on the health of consumer companies. And it is in visible upheaval — consolidating at the top, squeezed in the middle by artificial intelligence (AI, software that can generate copy, images and media plans), and increasingly competing with its own clients' in-house teams.

The economics are attractive and the risks are equally clear. Agencies are asset-light, people-intensive businesses with recurring client relationships and potential operating leverage. But client spending is discretionary, talent is portable (it can walk out the door with the client relationship), media platforms increasingly automate agency functions, and a regulatory or reputational failure can spread across many client accounts at once.

Ways in for a public-market investor: a small number of large, listed marketing-services holding companies — most prominently Omnicom (which absorbed rival Interpublic in late 2025) and the U.S. challenger firm Stagwell — plus foreign-listed groups (WPP, Publicis, Dentsu, Havas) and consulting firms that have pushed into the field (Accenture, Deloitte). Ways in for a private investor: the industry is overwhelmingly private. Thousands of independent creative and digital shops, founder-owned agencies, employee-owned firms, and private-equity-backed roll-ups make up the bulk of the field, and small agencies are routinely bought and sold. Light capital needs make ownership stakes and buy-and-build strategies common private routes.

2. What it is and how it is structured

NAICS (North American Industry Classification System — the U.S. government's standard scheme for grouping businesses) code 541810 covers establishments primarily engaged in creating advertising campaigns and placing that advertising in media [1]. A full-service agency can handle strategy, creative development and production, account management, media planning and buying, and campaign measurement for the same client, either in-house or through subcontractors.

The code deliberately excludes several adjacent activities that outsiders often lump in with "advertising" [1]:

• Public relations agencies — earned media, reputation, communications — are NAICS 541820.
• Media buying agencies — buying ad space/time wholesale and reselling it — are NAICS 541830.
• Media representatives — selling ad time/space on behalf of media owners — are NAICS 541840.
• Display advertising (indoor and outdoor) is NAICS 541850.
• Direct mail advertising is NAICS 541860.
• Advertising material distribution services are NAICS 541870.
• Other advertising-related services are NAICS 541890.
• Graphic design services (design without the wider agency offer) are NAICS 541430.
• Marketing consulting services are NAICS 541613.

This matters for reading the numbers: the giant "advertising" holding companies actually book revenue across several of these codes — media buying, PR, digital, data — and mostly overseas, so the federal 541810 line captures only one slice of their U.S. footprint (see Section 3).

Ownership mix. The field is bar-belled, and works in three layers:

1. Independent agencies — often founder-owned, employee-owned, or private-equity-backed — which dominate regional, specialist and founder-led work.
2. Agency networks, where multiple brands share technology, data, media-buying scale and back-office functions.
3. Large holding companies and consultancies, which combine advertising with public relations, commerce, customer experience, data, technology and management consulting.

Because the work is people-and-relationship-driven rather than asset-heavy, entry is easy and the population of firms is large and churny. The federal data do not provide a public-versus-private ownership split, but public holding companies dominate multinational scale while private independents remain the numerical majority.

3. How big it is

Federal statistics for NAICS 541810 in the United States. These come from different surveys and years and should not be read as one single-year snapshot:

That works out to roughly 13 employees per establishment and average annual pay near $107,000 per worker [3] — a picture of many small, well-paid professional shops rather than a few giant factories. Payroll runs at roughly a third of receipts (about 34%, comparing 2023 payroll with 2022 receipts) [2][3], which tells you labor is by far the biggest cost. Under the Small Business Administration (SBA) size standard, an advertising agency counts as a small business up to $25.5 million in average annual receipts [4], so the great majority of these 13,000-plus firms qualify as small.

Concentration. Within U.S. 541810, the top four firms earn about 26% of revenue, the top eight 30.6%, the top 20 37.6%, and the top 50 46.8% [2]. That is only moderate concentration — which can surprise readers who picture advertising as a handful of global titans. (The Herfindahl-Hirschman Index, or HHI, a standard concentration measure, is suppressed in the federal data for this industry and is therefore not reported here — no value is stated or inferred.) Note too that these ratios describe firms filing under 541810; they are not the same as global holding-company rankings, because a holding company owns many separately counted agencies and books much of its revenue in other codes and countries.

The undercount caveat. Two things make the $62 billion figure understate the industry's true economic weight. First, as noted, the global holding companies split their revenue across media-buying, PR, digital and other codes and across dozens of countries, so their U.S. 541810 line is only a fraction of what people mean by "the advertising business." Total U.S. advertising spending across all media runs well over $400 billion a year and rising [20][21] — far larger than agency receipts, because most of that money flows through to media owners, not agencies. Second, County Business Patterns (CBP) counts only employer establishments; it excludes the self-employed, businesses without employees, and most government workers [5]. That misses the large population of solo freelancers and nonemployer creative contractors who do agency-style work without payroll (the Census Nonemployer Statistics series is built to cover them, but the figures were not supplied here) [6]. The federal 541810 line is best read as the payrolled, U.S.-establishment core of a much larger, more fragmented creative economy.

4. The investable universe

Publicly traded pure-play advertising is thin and getting thinner. No listed company maps cleanly to U.S. 541810; the listed options are marketing-services holding companies and consultancies whose activities span 541810 and its neighbors — media buying, PR, data, commerce, technology and consulting.

Two context points for the universe:

• Interpublic (formerly IPG, NYSE: IPG) no longer trades independently — it was acquired by Omnicom and delisted in November 2025 [7]. Its shareholders received Omnicom stock (IPG holders ended up owning 39.4% of the combined company; Omnicom holders 60.6%) [7][8].
• The fastest-growing "agencies" are consulting firms. Accenture Song (part of Accenture, NYSE: ACN) generated roughly $20 billion in its latest fiscal year and was ranked the world's largest agency company in 2025, ahead of the traditional holding companies; Deloitte Digital is a comparable force [15][16]. For a public investor, exposure here comes through a large IT-consulting stock, not a pure ad play.

Major private and other owners. The overwhelming majority of the industry is private. Examples of notable independents include Horizon Media (founder-led independent media agency), Tombras (independent creative, media and performance shop), and Mower (employee-owned through an employee stock ownership plan, or ESOP) [17]. Beyond named firms sit thousands of founder-owned creative and digital shops and private-equity buy-and-build platforms. Large advertisers' in-house agencies — teams brands build internally — are also, in effect, a big and growing "owner" of advertising work, though they are not sold to investors. Private-company disclosure is limited: before backing an agency, verify the actual legal owner, any debt provider, minority investors, earn-out obligations and intellectual-property ownership rather than relying on brand name or reported billings.

5. How the money works

Agencies sell time and ideas, not products, so profit turns on what they charge, how efficiently their people work, and how much of client budgets they touch. A crucial distinction: media billings — the client ad spend an agency manages — are not the same as agency revenue. A large share of media and production spend is passed straight through to third parties. WPP, for example, reported 2025 revenue of £13.6 billion but revenue less pass-through costs of £10.2 billion, with a headline operating margin of 13.0% measured on that net figure [10]. Always compare agencies on a consistent net-revenue basis.

Income comes from a mix of models [18]:

• Fees and retainers. The dominant model today is a negotiated fee — a monthly retainer for an agreed scope, or project fees for defined deliverables. This is essentially billing for staff time and expertise, so the core driver is billable utilization: keeping expensive creative, strategy and account staff busy on paying work.
• Media commissions and management fees. Historically agencies took a ~15% commission on media they bought for clients. That has largely given way to media-management fees (commonly ~10–20% of the ad spend the agency plans and buys) or flat fees. The more of a client's media budget an agency handles, the more this scales.
• Performance and hybrid arrangements. Contracts increasingly blend a base fee with performance bonuses tied to results (sales lift, conversions) — upside linked to client outcomes, but more volatility.
• Non-transparent income (a scrutinized gray zone). Media agencies have in some cases earned money clients could not see — cash rebates from media suppliers and volume-based "service agreements" — a practice flagged by the Association of National Advertisers (ANA) [19]. This is a source-of-earnings and a reputational/regulatory risk (see Sections 7 and 9).

The main cost is labor. Omnicom describes employee compensation, freelance labor, third-party services, occupancy, technology and overhead as the principal economic costs of its agencies [9]. Because the business is asset-light, the most useful operating signals are:

• organic net-revenue growth (net new business minus lost accounts);
• revenue less pass-through costs, and staff costs as a percentage of it;
• billable utilization and revenue per employee;
• adjusted operating margin / EBITDA (earnings before interest, taxes, depreciation and amortization);
• client retention, account losses and new-business wins, and client concentration;
• accounts-receivable days and cash conversion;
• recurring retainer work versus volatile project work.

For private investors, normalized cash flow matters more than gross billings. A firm with impressive media volume but weak collections, low pricing power or heavy subcontracting may be worth less than a smaller agency with durable retainers and strong cash conversion.

6. What drives demand

• The overall ad-spending cycle. Agency income tracks how much brands spend to advertise, which is closely tied to the economy and to consumer-company confidence. Advertising is a discretionary budget — among the first cut in downturns and quick to rebound in recoveries. The Interactive Advertising Bureau (IAB) forecasts U.S. ad spend to grow 9.5% in 2026, led by social media, connected TV (CTV) and commerce media [20]. That is a media-spend forecast, not an agency-revenue guarantee.
• The shift to digital, social and connected TV. Money keeps moving from linear TV, print and radio into digital. U.S. digital advertising revenue reached $294.6 billion in 2025, up 13.9% year over year, with digital video up 25.4% and programmatic advertising at $162.4 billion (IAB/PwC) [21]. Those figures describe media owners and platforms, not 541810 agencies — but they show where client budgets are going. Agencies that can execute in data-driven, social, video and commerce media capture the growth; those anchored to legacy formats shrink [22].
• Client marketing budgets and new-business wins. At the firm level, demand is lumpy and account-based: winning or losing a large "agency of record" relationship can move a shop's revenue sharply. Client review cycles and procurement pressure set the tempo.
• Cyclical events. Elections, the Olympics, the World Cup and product-launch cycles create predictable spikes in spend in those years [20].
• AI, cutting both ways. Agencies can sell AI-enabled strategy, personalization, content production and measurement — but automation also reduces the labor needed for routine work (see Section 9). The likely result: more demand for high-value strategy and integration, and fee pressure on commoditized production and media tasks.
• Complexity. Paradoxically, the fragmentation of media (dozens of platforms, constant measurement change, privacy rules) creates demand for specialists who can navigate it — a partial offset to in-housing.

7. Regulation

Advertising agencies are lightly licensed but operate inside a real body of advertising law, most of it enforced by the Federal Trade Commission (FTC):

• Truth-in-advertising and agency liability. The FTC enforces the FTC Act against deceptive and unsubstantiated advertising, and requires that native/sponsored content be recognizable as advertising with clear, prominent disclosure [25]. Crucially, an agency itself can be held liable for ads it created or disseminated when it knew or should have known the claims were deceptive — agencies are not mere messengers in the eyes of the law [25].
• Endorsement and review rules. The FTC's updated Endorsement Guides (16 CFR Part 255) require clear disclosure of paid or "material" connections in influencer and testimonial advertising, and explicitly put intermediaries — including advertising and PR agencies — on the hook for undisclosed connections [23]. The FTC's 2024 rule banning fake reviews and testimonials can apply directly to agencies that create or sell fake reviews, suppress genuine ones, or misuse social-media influence indicators [24].
• Antitrust and media-buying coordination. The FTC cleared Omnicom's acquisition of IPG in 2025 only under a consent order barring the merged firm from coordinating to steer advertiser spending away from media platforms based on their political or ideological content — a signal that agencies face competition scrutiny not just on mergers but on collective "brand-safety" conduct [26].
• Media-buying transparency. Following ANA investigations into rebates, opaque "service agreements," and murky programmatic supply chains, agencies face growing client and self-regulatory pressure toward disclosed, auditable media arrangements [19]. This is more contractual and reputational than statutory, but it is reshaping how media money is handled.
• Other exposures: the CAN-SPAM Act for commercial email [27]; children's privacy and child-directed advertising; state consumer-privacy and data-use laws; sector-specific rules for healthcare, financial services and alcohol; and emerging copyright, likeness and training-data disputes over AI-generated content.

8. Competitive dynamics and consolidation

The defining story of 2025–2026 is consolidation at the top colliding with disruption from below.

At the top, Omnicom's completed ~$13.25 billion all-stock acquisition of Interpublic — closed in November 2025 after global regulatory clearance — created the world's largest advertising holding company, with combined revenue above $25 billion, and collapsed the traditional "Big Six" holding groups (WPP, Omnicom, Publicis, IPG, Dentsu, Havas) into a smaller set led by Omnicom [7][8][26]. The stated logic was scale — especially in media buying and data — with roughly $750 million of annual cost savings and more than 4,000 jobs cut in the reorganization [7]. Consolidation across the industry is driven by client demand for integrated services, the investment required for AI/data/measurement, succession needs among founder-owned agencies, and the appeal of cross-selling creative, media, commerce and consulting.

At the same time the competitive set is widening. Consulting firms (Accenture Song, Deloitte Digital) have moved "upstream" of advertising, building the data systems and workflows that run marketing inside big enterprises, and now rival the holding companies in scale [15][16]. And clients themselves compete with their agencies by building in-house teams: industry surveys report that roughly four in five large advertisers now run some form of in-house agency, up from the high-70s a few years earlier [28]. Independents and PE-backed roll-ups keep churning the mid-market. The Census concentration data (top four firms at 26% of U.S. 541810 receipts) confirm a still-fragmented base [2]. The net result is intense fee pressure and a scramble for differentiation — increasingly around proprietary data and AI capability rather than pure creative reputation.

9. Risks

• AI disrupting the core model. Generative AI can produce copy, images, and even media plans that agencies used to bill for. Surveys report that a majority of senior marketers spent less on agencies in 2025 because of AI, that most agency professionals see AI as a threat to their main revenue streams, and that industry optimism has fallen sharply [28]. In 2025, worldwide ad spending grew strongly (roughly 8–9%) yet holding-company revenue slipped ~1% — a rare and telling divergence between rising ad spend and falling agency revenue [28]. This is the industry's central existential risk.
• In-housing. Every account a client brings in-house is revenue an agency loses, often permanently, and AI is accelerating the trend [28].
• Client concentration and account volatility. Losing a single large account can gut a shop's revenue and margins overnight; new-business cycles make earnings lumpy.
• Cyclicality. Advertising budgets are discretionary and fall fast in recessions.
• Talent mobility. Creative directors, strategists and client leaders can leave and take the client relationship with them.
• Platform disintermediation. Large media and commerce platforms can automate planning, targeting and measurement, narrowing the agency's role.
• Margin illusion. Gross billings and reported revenue can obscure the real economics once pass-through costs are stripped out.
• Fee compression and transparency scrutiny. Procurement pressure, plus fallout from rebate and transparency controversies, keeps downward pressure on pricing and can chill lucrative (if opaque) media income [18][19].
• Regulatory and legal exposure. Agencies can be directly liable for deceptive ads, undisclosed endorsements and fake reviews; antitrust and privacy rules raise compliance cost; and a single failure can damage many client accounts [23][24][26].
• Integration and merger risk. Mega-deals like Omnicom-IPG carry real execution risk — client conflicts (rival brands can't share one agency), talent flight, debt load, and the challenge of delivering promised savings without damaging the creative product [7].
• Private-market opacity. Smaller firms may lack audited financials, reliable client-retention data or clear ownership documentation.

10. How to invest and the outlook

Public-market routes. Direct listed exposure runs through the marketing-services holding companies — Omnicom (OMC) as the scaled leader and Stagwell (STGW) as the smaller U.S. challenger, plus foreign-listed WPP, Publicis, Dentsu and Havas for international investors [7][10][11][12][13][14]. Treat these as diversified agency-and-consulting businesses, not pure plays on U.S. 541810; foreign listings add currency, liquidity and disclosure differences. They have historically been cash-generative stocks that return capital through dividends and buybacks, valued on modest earnings multiples — closer to mature services businesses than growth tech. Investors who want the growth side of marketing services increasingly get it through consulting stocks like Accenture (ACN), whose Song unit is now the largest agency business globally, though it sits in a different NAICS code and trades on very different terms [15]. There is no broad, pure "advertising agency" index fund; exposure is stock-by-stock. When comparing names, weigh organic net-revenue growth, client retention, staff-cost discipline, free-cash-flow conversion, acquisition returns and debt — not just dividend yield.

Private routes. Because the industry is overwhelmingly private and asset-light, the more natural way in for many investors is owning, backing, or rolling up independent agencies — founder-owned creative and digital shops, or private-equity buy-and-build platforms that acquire specialists and consolidate back-office costs. Valuations for small agencies are typically set on a multiple of profit (EBITDA) and hinge on client retention, recurring revenue, and specialist capability. Underwrite the things that don't show up in a billings number: recurring revenue and contract quality; client concentration and retention by cohort; normalized net revenue after pass-through costs; utilization, pricing and staffing; founder dependence and succession; AI adoption and IP controls; working capital and collection history; and integration capability. Note that the SBA's $25.5 million size standard is a government-contracting classification, not a valuation ceiling or a revenue forecast [4].

Near-term outlook (forward-looking judgment). The base case is a two-speed industry. Total U.S. ad spending should keep growing at a mid-to-high single-digit rate, led by digital, social, connected TV and commerce media, with cyclical lifts from elections and major events [20][21]. But that top-line growth is not flowing evenly to agencies: AI and in-housing are compressing the fees and headcount the traditional model rests on, and 2025's split between rising ad spend and falling holding-company revenue is the warning sign [28]. The likely winners are firms that combine trusted client relationships with proprietary data, measurable outcomes and AI deployed to do more with fewer people — turning the technology into a margin tool rather than a substitute for their services. The likely losers are undifferentiated, headcount-heavy shops billing for work a client can now generate in-house. For public investors this argues for scrutinizing organic revenue growth and margin trajectory; for private investors, for backing specialists with defensible capabilities over generalist creative shops.

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Sources

1. U.S. Census Bureau, "2022 NAICS: 541810 Advertising Agencies (definition and exclusions)." https://www.census.gov/naics/?details=541810&input=541810&year=2022
2. U.S. Census Bureau, Economic Census 2022 — "Selected Sectors: Concentration of Largest Firms for the U.S." (NAICS 541810; receipts, firm count, CR4/CR8/CR20/CR50; HHI suppressed). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
3. U.S. Census Bureau, County Business Patterns 2023 (NAICS 541810; establishments, employment, annual and first-quarter payroll). https://www.census.gov/programs-surveys/cbp/data/datasets.html
4. U.S. Small Business Administration, "Table of Small Business Size Standards" (NAICS 541810 — $25.5M receipts), 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau, "County Business Patterns Methodology" (employer-series coverage limits). https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
6. U.S. Census Bureau, "Nonemployer Statistics." https://www.census.gov/programs-surveys/nonemployer-statistics.html
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9. U.S. Securities and Exchange Commission, Omnicom Group Form 10-K (cost structure of agency operations), 2026. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000029989&type=10-K
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16. Deloitte, "Deloitte Organization Structure" and Deloitte Digital marketing services. https://www.deloitte.com/us/en/about/governance/network-brand-alliances.html
17. American Association of Advertising Agencies (4A's) agency profiles — Horizon Media and Tombras; Mower, "About Us" (employee-owned ESOP). https://www.aaaa.org/; https://www.mower.com/about-us/
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19. Association of National Advertisers (ANA), "Media Transparency Initiative" and Programmatic Media Supply Chain Transparency Study, 2016 / 2023. https://www.ana.net/content/show/id/industry-initiative-media-transparency
20. Interactive Advertising Bureau (IAB), "2026 Outlook Study Forecasts 9.5% Growth in U.S. Ad Spend," 2026. https://www.iab.com/news/outlook-study-forecasts-9-5-growth-in-u-s-ad-spend/
21. IAB and PricewaterhouseCoopers (PwC), "Internet Advertising Revenue Report: Full Year 2025" ($294.6B total, programmatic $162.4B, digital video +25.4%), 2026. https://www.iab.com/insights/internet-advertising-revenue-report/
22. eMarketer, "US ad spending growth normalizes as digital maturity sets in," 2025. https://www.emarketer.com/content/us-ad-spending-growth-normalizes-digital-maturity-sets
23. U.S. Federal Trade Commission, "Guides Concerning Use of Endorsements and Testimonials in Advertising," 16 CFR Part 255 (agency/intermediary liability), 2023. https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-255
24. U.S. Federal Trade Commission, "Final Rule Banning Fake Reviews and Testimonials," 2024. https://www.ftc.gov/news-events/news/press-releases/2024/08/federal-trade-commission-announces-final-rule-banning-fake-reviews-and-testimonials
25. U.S. Federal Trade Commission, "Native Advertising: A Guide for Businesses" (truth-in-advertising, disclosure, disseminator liability), 2015. https://www.ftc.gov/business-guidance/resources/native-advertising-guide-businesses
26. U.S. Federal Trade Commission, "FTC Acts to Prevent Anticompetitive Coordination in Global Advertising Merger" (Omnicom/IPG consent order), 2025. https://www.ftc.gov/news-events/news/press-releases/2025/06/ftc-prevents-anticompetitive-coordination-global-advertising-merger
27. U.S. Federal Trade Commission, "CAN-SPAM Act: A Compliance Guide for Business." https://www.ftc.gov/business-guidance/resources/can-spam-act-compliance-guide-business
28. eMarketer, "FAQ on ad agencies: consolidation, AI disruption, and what's changing in 2026" (in-housing rates, AI-threat surveys, holdco revenue vs. ad-spend divergence), 2026. https://www.emarketer.com/content/faq-on-ad-agencies--consolidation--ai-disruption--what-s-changing-2026