Marketing Consulting Services (NAICS 541613) — U.S. Industry Primer

1. Overview

Marketing consulting is the business of selling advice about how organizations should market themselves — what to sell, to whom, at what price, and through which channels — rather than the business of buying media or making the ads. In the North American Industry Classification System (NAICS — the federal scheme for sorting businesses into industries), code 541613 covers U.S. firms that help clients set marketing objectives, forecast sales, plan new products and pricing, and design go-to-market, customer-experience, and franchise strategies.[1]

Why it matters to an investor: marketing is a large, recurring line item in nearly every company's budget, and the "who should we hire to think about it" question feeds a fragmented, high-margin, people-based services market. The catch is that the field is being reshaped in real time by generative artificial intelligence (AI — software that can produce copy, images, and media plans on its own) and by clients pulling work in-house.[21]

Public versus private ways in differ sharply. There is no pure-play public "marketing consulting" stock: the service line sits buried inside larger companies — global advertising holding groups (Omnicom, Publicis, WPP), technology-and-strategy consultancies (Accenture, Deloitte, McKinsey), and smaller listed challengers (Stagwell, S4 Capital). Most of the industry by headcount is private: tens of thousands of boutique shops, private-equity-backed platforms, and solo consultants. Public investors buy the diversified parents; private investors buy, build, or lend to the boutiques.

2. What it is and how it is structured

In scope (NAICS 541613). Establishments primarily engaged in advising businesses on marketing issues — marketing strategy and planning, segmentation and positioning, sales forecasting, new-product development and pricing, customer-experience and sales-management consulting, outsourced marketing leadership, and licensing/franchise planning.[1] The code sits inside group 5416, Management, Scientific, and Technical Consulting Services, within Sector 54, Professional, Scientific, and Technical Services.[1]

What it explicitly excludes — and where that work is counted instead. The federal definition draws hard lines that keep 541613 small relative to the everyday meaning of "marketing":[1]

• Creating and placing advertising → 541810 (Advertising Agencies) and 541830 (Media Buying Agencies).
• Public-relations planning and execution → 541820 (Public Relations Agencies).
• Direct-mail advertising campaigns → 541860.
• Market research, surveys, and opinion polling → 541910 (Marketing Research and Public Opinion Polling).
• Graphic/creative design → 541430.

So a firm that runs the ad campaign is not in 541613; a firm that tells the client what the campaign should be is. In practice the boundary is blurry — a consulting firm may set the strategy while an agency makes the campaign, a research firm measures the response, and a technology provider builds the customer database. The big advertising conglomerates report most revenue under the advertising and media codes, not 541613, which is why the strict federal industry is far smaller than the "marketing services" world people picture.

Ownership mix. This is a cottage industry with a few giants at the top. The typical establishment is tiny — roughly six employees on average (315,229 employees across 52,258 establishments in 2023).[2] Structures range from solo proprietors and single-member LLCs (limited-liability companies), through independent and family-run partnerships, up to private-equity-backed platforms and subsidiaries of listed multinationals. The federal Small Business Administration (SBA) treats a firm in this code as "small" if its annual receipts are $19 million or less — a contracting-eligibility threshold (not an industry-size or valuation benchmark) that the overwhelming majority of firms clear easily.[4] Federal data does not publish a public-versus-private ownership split, so the concentration statistics below should not be read as an ownership census.

3. How big it is

Federal statistics for the strictly defined industry (firms with paid employees only). The figures blend two official vintages — receipts and concentration from the 2022 Economic Census, and establishments, employment, and payroll from 2023 County Business Patterns (CBP) — so they are not a single company-style income statement.

That works out to roughly $1.5 million of receipts per firm and about $83,000 in average annual pay per employee — a well-paid, low-capital, labor-driven industry.[2][3]

Fragmentation is extreme. The four largest firms take just 7.1% of receipts; the top 8, 10.6%; the top 20, 16.5%; the top 50, 24.4%.[3] The Herfindahl-Hirschman Index (HHI — a standard 0–10,000 concentration score, where higher means more concentrated) is 24.1, near the floor, indicating an almost perfectly competitive market with no dominant player.[3]

The undercount caveat (important here). The employer figures above miss most of the bodies in this trade. Marketing consulting is a classic freelancer/solo-operator field, and independent consultants with no payroll are captured in the Census Bureau's separate Nonemployer Statistics, not in the CBP and Economic Census employer tallies used above.[5] Nationally, the large majority of nonemployer businesses are sole proprietorships, and marketing advisory is exactly the kind of work one experienced person sells alone — so the true population of "marketing consultants" is materially larger than the ~50,500 employer firms, and the receipts figure excludes that solo layer.[5] Our federal file does not quantify 541613 nonemployers, so no specific count is asserted here. Conversely, industry analysts who use a broader definition (folding in adjacent digital and agency services) put the U.S. "marketing consultants" market at roughly $88 billion in 2025, growing about 3% a year — larger than the $77.5 billion federal number because it counts more activity, not because the federal figure is wrong.[6]

Metrics we do not have. The federal data provides no 541613-specific series for operating margin, billable utilization, realization, pricing, or profitability. For a service industry the more useful operating measures — utilization, revenue per employee, retainer mix, client retention, backlog, cash conversion — must come from company filings, not the Census.

4. The investable universe

There is no listed company whose business is only NAICS 541613 marketing consulting. Public exposure comes through diversified parents where marketing consulting is one profit line among advertising, media, technology, and commerce. "Scale" below is total company revenue (a size proxy), not the 541613 slice.

Major private and "other" owners. Some of the most important marketing-consulting franchises are not listed as such. Deloitte Digital, McKinsey (Growth, Marketing & Sales practice, plus QuantumBlack for AI), Bain, Boston Consulting Group, PwC, EY, KPMG, and IBM (IBM iX) have all bought their way into brand and marketing consulting over the past decade. Private equity is the other big owner: DEPT (The Carlyle Group), Bounteous (New Mountain Capital), and the Brandtech Group — which owns Jellyfish and other digital-marketing businesses — are PE-backed platforms competing for the same customer-strategy demand, alongside independents such as Edelman.[23] Below them sit tens of thousands of boutiques and solo consultants — the true bulk of NAICS 541613 by firm count.[2][5]

5. How the money works

This is a professional-services business: the asset is people's time and expertise, and the profit-and-loss statement is dominated by talent cost, not capital.

• Revenue models. Fees now dominate over commissions. Marketer surveys put roughly 68% of agency/consulting compensation on a fee basis (fixed fee or labor/hours), with the rest split across commission and value- or performance-based terms.[20] The historic 15%-of-media-spend commission that ruled for a century is largely gone.[20] Common structures are fixed-fee strategy projects, time-and-materials consulting, monthly retainers, managed services, and performance incentives.
• Billings ≠ revenue. A firm may "handle" hundreds of millions in client media spend (billings) but only its fee is revenue. Watch net revenue — revenue less pass-through/third-party costs (media, production, technology billed on behalf of clients) — which is the honest measure of a firm's own output. WPP's filings stress this figure and note that its contracts are often short-term, cancellable, and paid in arrears.[9]
• Core operating levers, the same ones that drive any consultancy or agency:
• Billable utilization — the share of staff hours charged to clients; a few points is the difference between a good and a bad year.
• Bill rate / revenue per head — pricing power per consultant.
• Client retention and concentration — retainers and repeat work smooth revenue; a few large accounts leaving can gut a boutique.
• Margins. Because there is little to buy but desks and laptops, incremental work drops quickly to profit. Large listed holding companies run operating margins in the mid-teens; owners of small firms effectively pay themselves the profit. The chief cost risk is carrying staff through a downturn when utilization falls.
• Cyclicality. Marketing budgets are discretionary and get cut early in a slowdown, so revenue is more cyclical than, say, accounting or tax advice.

For private buyers, founder dependence, employee turnover, recurring/retainer revenue, pipeline quality, working capital, and the transferability of client relationships matter more than headline revenue.

6. What drives demand

• Corporate marketing budgets and the ad cycle. When companies feel confident they spend more on marketing and on advisers to steer it; in a downturn, advisory fees are among the first cuts.[6] As a scale marker of the surrounding ecosystem (not this code's size), the Interactive Advertising Bureau (IAB) reported U.S. internet advertising revenue of $258.6 billion in 2024, up 14.9% year over year — the underlying pool of spending that strategy, data, and customer-experience advice feeds off.[22]
• Digital transformation and data. The shift to e-commerce, first-party data, customer-experience redesign, and marketing technology ("martech") has been the industry's biggest tailwind — and is why technology consultancies (Accenture, Deloitte) muscled into a business once owned by ad agencies.[8]
• Retail media and personalization. The explosion of retailer-run ad networks and AI-driven personalization creates new, complicated channels brands need help navigating.[21]
• Private-equity portfolio work. Marketing, pricing, and customer-acquisition projects inside PE-owned companies are a steady, outcome-focused demand source.
• Regulatory and privacy complexity. Tightening privacy rules (below) turn "how do we market compliantly" into a paid advisory question.[19]
• The AI double-edge. Generative AI is both a demand driver (clients need help adopting it) and a demand destroyer (it automates work clients used to pay for). In 2025, roughly 60% of senior U.S. marketing leaders reported spending less on agencies specifically because of AI, and a similar share of brands expect to pay agencies less where AI is deployed.[21]

Forward-looking judgment: demand should be strongest where firms tie marketing advice to revenue, customer economics, data, CRM, commerce, or AI implementation. Generic hourly strategy work is the most exposed to in-housing and price pressure.

7. Regulation

Marketing consultants are lightly licensed but operate inside a strict advertising-, marketing-, and privacy-law framework that their clients must obey — and that consultants are increasingly expected to help manage. Liability often flows to the adviser who helps prepare or distribute a problematic claim.

• Truth-in-advertising (Federal Trade Commission, FTC). Federal law requires advertising to be truthful, non-deceptive, and — where relevant — substantiated by evidence; the FTC enforces this and can impose penalties.[16]
• Endorsements and fake reviews. The FTC's Endorsement Guides (updated 2023) require honest, clearly disclosed endorsements and cover social-media influencers, with new guidance on disclosing AI-generated or simulated content. The separate Consumer Reviews and Testimonials Rule took effect October 21, 2024, banning fake or AI-generated reviews, bought reviews, undisclosed insider reviews, and review suppression — with agencies potentially liable.[16]
• Email marketing. The CAN-SPAM Act (Controlling the Assault of Non-Solicited Pornography And Marketing Act) governs commercial email, including business-to-business messages; hiring an outside marketing firm does not remove the sender's responsibility.[17]
• Data privacy. State privacy laws — led by California's CCPA/CPRA (California Consumer Privacy Act, as amended by the California Privacy Rights Act) — govern how customer data can be collected, sold, or "shared" for targeted marketing, and impose obligations on service providers and contractors. Recent California rules add cybersecurity audits, risk assessments, and rules for automated decision-making. U.S. law generally uses an opt-out model, versus the opt-in standard of Europe's GDPR (General Data Protection Regulation).[19]
• Antitrust at the top. Large mergers among marketing groups draw scrutiny: the FTC cleared Omnicom's acquisition of Interpublic (IPG) in 2025 only under a consent order barring the combined firm from coordinating to steer advertising spend away from platforms based on their political or ideological content.[18]
• No occupational license. Unlike law, accounting, or medicine, "marketing consultant" carries no professional license or entry barrier — a key reason the industry is so fragmented.

8. Competitive dynamics and consolidation

Two forces define the top of the market:

1. Holding-company consolidation. In 2025, Omnicom completed its ~$13 billion all-stock acquisition of Interpublic (IPG), creating the world's largest marketing and advertising group with pro forma revenue over $25 billion (legacy Omnicom holders own ~60.6%, legacy IPG ~39.4%; the combined firm trades as OMC).[7] The rationale — scale, data, and cost synergies to defend margins against AI and in-housing — is the industry's survival playbook.[7][21]
2. Consultancies invading from above. Accenture, Deloitte, McKinsey, and the Big Four/strategy firms have spent a decade acquiring creative and martech shops. Accenture Song reached ~$19 billion and briefly ranked as the world's largest agency group in 2024, before the Omnicom-IPG deal.[8] These firms compete "upstream," selling boardroom strategy and technology alongside campaign work.

Meanwhile the bottom of the market stays wide open: with an HHI of 24.1 and the top 50 firms holding under a quarter of receipts, thousands of boutiques and solo consultants win on specialization, relationships, and price.[3] Consolidation does not erase that fragmentation, because many acquisitions land in adjacent NAICS codes. The squeeze is on the middle — mid-size independents caught between scaled giants, nimble freelancers, and increasingly capable in-house teams. Weakness is visible at the top too: S4 Capital's revenue fell double digits in 2024, and Dentsu posted a record loss and suspended its dividend in FY2025.[13][11]

9. Risks

• AI disruption / deflation. The clearest structural risk: if AI does the work, clients pay less. Roughly six in ten marketing leaders were already cutting agency spend on that basis in 2025.[21]
• In-housing. A large majority of big multinationals now run in-house agencies, pulling work away from outside advisers.[21]
• Cyclicality. Discretionary marketing and transformation budgets get cut fast in downturns, and utilization-driven margins fall with them.[6]
• Client concentration and low switching costs. Accounts are won and lost on relationships and results; there is little lock-in and no license moat.
• Short, cancellable contracts. Project work gives less revenue visibility than software subscriptions or long-term contracts.[9]
• Talent economics. The whole value is in people, who can leave — and take clients — at any time.
• Platform dependence. Changes by major search, social, retail, or advertising platforms can impair campaign performance and client demand.
• Privacy/regulatory exposure. Advice that leads a client into a privacy or false-advertising violation is a legal and reputational risk for both parties.[16][19]
• M&A execution. Roll-ups and mega-mergers carry integration cost, brand conflict, duplicated talent, and leverage.
• Public-market signal risk. The listed proxies are diversified holding companies; their stocks reflect global advertising cycles and heavy debt/M&A more than the marketing-consulting niche itself.

10. How to invest, and the outlook

Public routes. The cleanest listed exposure is the advertising/marketing holding companies — Omnicom (OMC), Publicis (PUB/PUBGY), WPP (WPP), Havas (HAVAS), and the digital challenger Stagwell (STGW) — plus Accenture (ACN) as a technology-consulting play with a huge marketing arm. As of mid-2026, Publicis carried the largest market value of the traditional trio (roughly $25 billion), Omnicom sat near $15 billion after the merger, WPP had collapsed to a few billion after a steep decline, and Stagwell was under $2 billion.[24][7][9] These are dividend-paying, cyclically sensitive, single-digit-to-mid-teens-margin businesses — value/income profiles more than growth stories, each with its own turnaround or integration risk. There is no ETF (exchange-traded fund) dedicated to marketing consulting; broad "communication services" or "advertising" funds are the closest baskets.

When sizing any of these, separate genuine customer-strategy and marketing-transformation exposure from media buying and unrelated consulting, and prioritize organic growth in data/commerce/transformation services, revenue less pass-through costs, stable-to-improving margins, strong free cash flow (FCF) and manageable net leverage, and disciplined acquisitions. Do not value a diversified group off the $77.5 billion federal receipts figure — that is an industry total, not any one company's addressable revenue.[3]

Private routes. This is fundamentally a private-market industry. The realistic ways in are (a) building or buying a boutique — low capital, high margin, but people-dependent and hard to scale; (b) roll-up / private-equity plays consolidating specialist shops in data, retail-media, CRM, and martech services, which is where much of the deal activity sits (DEPT/Carlyle, Bounteous/New Mountain, Brandtech/Jellyfish); (c) growth capital for data, AI, CRM, or commerce specialists; or (d) private credit to firms with recurring retainers and diversified clients. Valuations hinge on recurring revenue, client concentration, renewal history, founder dependence, and the transferability of relationships beyond the rainmaker. The SBA's $19 million size standard helps identify federal-contracting opportunities (affiliates must be counted) but is not a measure of investment quality.[4]

Near-term outlook (forward-looking). Expect the barbell to widen: scaled giants (Omnicom-IPG, Accenture, Publicis) consolidating to defend margins, and a thriving long tail of AI-augmented solo and boutique consultants — with the mid-market squeezed hardest. AI should keep deflating routine execution fees while raising demand for the higher-value work it can't yet do: strategy, judgment, data governance, and helping clients deploy AI itself. Growth for the broad industry is likely to stay modest (analysts model low-to-mid single digits),[6] but the mix is shifting toward technology-and-data advisory and away from traditional campaign work — the reason a technology firm (Accenture) and a merged ad giant (Omnicom) now bracket the top of a business that, on paper, is a $77 billion federal industry of mostly very small firms.[3][8][7]

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Sources

1. U.S. Census Bureau. "NAICS 541613 — Marketing Consulting Services (2022 definition, inclusions and exclusions)." 2022. https://www.census.gov/naics/?details=541613&input=541613&year=2022
2. U.S. Census Bureau. "County Business Patterns: 2023" — establishments, employment, annual and first-quarter payroll for NAICS 541613. 2023. https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
3. U.S. Census Bureau. "Selected Sectors: Concentration of Largest Firms for the U.S.: 2022," 2022 Economic Census table EC2200SIZECONCEN — receipts, firm count, CR4/CR8/CR20/CR50, HHI for NAICS 541613. 2022. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
4. U.S. Small Business Administration. "Table of Size Standards" (541613 = $19 million receipts). 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau. "Nonemployer Statistics by Industry: 2022" (businesses without paid employees; sole-proprietorship share). 2022. https://www.census.gov/library/visualizations/interactive/nonemployer-statistics-by-industry-2022.html
6. IBISWorld. "Marketing Consultants in the US — Market Size (2025) and Industry Analysis." 2025. https://www.ibisworld.com/united-states/market-size/marketing-consultants/5848/
7. Omnicom Group. "Omnicom Completes Acquisition of Interpublic" (newsroom release); Campaign US, "Omnicom completes acquisition of IPG, creating world's largest ad holding company." 2025. https://www.omc.com/newsroom/omnicom-completes-acquisition-of-interpublic-forming-the-worlds-leading-marketing-and-sales-company-built-for-intelligent-growth-in-the-next-era/
8. Accenture. "2025 Annual Report and Form 10-K" (Accenture Song scale); Ad Age / Storyboard18 coverage of Accenture Song ~$19–20 billion, largest global agency group 2024. 2024–2025. https://www.sec.gov/Archives/edgar/data/1467373/000146737325000217/acn-20250831.htm
9. WPP plc. "Preliminary Results 2024" and "Annual Report 2025" (revenue, revenue less pass-through costs, cancellable/short-term contracts). 2025. https://www.wpp.com/en/investors/annual-report-2025
10. Publicis Groupe. "Full Year 2024 Results." 2025. https://www.publicisgroupe.com/sites/default/files/press-releases/2025-02/CP_Resultats_FY2024%20ENG_20250204_0.pdf
11. Dentsu Group. "FY2025 Results / Integrated Report 2025" — ¥1.19 trillion net revenue, record loss, dividend suspended. 2025. https://www.group.dentsu.com/en/news/release/001517.html
12. Stagwell Inc. Full-year 2024 results (Form 8-K / 10-K), revenue ~$2.3 billion. 2025. https://www.sec.gov/Archives/edgar/data/876883/000087688325000009/Financial_Report.xlsx
13. S4 Capital plc. "Full Year 2024 Results," revenue ~£848 million. 2025. https://www.s4capital.com/annualreport24/2024-performance
14. Advantage Solutions Inc. "Fourth Quarter and Full Year 2024 Results," total revenue $3,566.3 million. 2025. https://www.globenewswire.com/news-release/2025/03/07/3038854/0/en/Advantage-Solutions-Reports-Fourth-Quarter-and-2024-Results-Transformation-Initiatives-Continue-to-Strengthen-the-Company.html
15. Havas N.V. "2025 Annual Report" (listed on Euronext Amsterdam following the December 2024 spin-off from Vivendi). 2025. https://www.havas.com/press_release/havas-publishes-its-2025-annual-report-and-the-agenda-for-its-2026-annual-general-meeting/
16. U.S. Federal Trade Commission. "Advertising and Marketing" business guidance; "Guides Concerning Use of Endorsements and Testimonials" (16 CFR Part 255, 2023 update); "Consumer Reviews and Testimonials Rule" (16 CFR Part 465, effective Oct. 21, 2024). 2023–2024. https://www.ftc.gov/business-guidance/resources/consumer-reviews-testimonials-rule-questions-answers
17. U.S. Federal Trade Commission. "CAN-SPAM Act: A Compliance Guide for Business." 2023. https://www.ftc.gov/business-guidance/resources/can-spam-act-compliance-guide-business
18. U.S. Federal Trade Commission. "FTC Prevents 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
19. California Privacy Protection Agency (CPPA). CCPA/CPRA FAQs and 2025 regulations (cybersecurity audits, risk assessments, automated decision-making). 2025–2026. https://cppa.ca.gov/faq
20. ANA / MarketingProfs and Digiday. "Agency compensation models: ~68% fee-based; billings vs. revenue; decline of the 15% media commission." 2017–2024. https://www.marketingprofs.com/charts/2017/32204/how-marketing-and-advertising-agencies-are-compensated
21. Forbes Agency Council / eMarketer / World Federation of Advertisers. "In-housing and AI pressure on marketing agencies; ~60% of marketing leaders cutting agency spend due to AI; majority of large multinationals running in-house agencies." 2025. https://www.forbes.com/councils/forbesagencycouncil/2025/05/21/are-in-housing-and-ai-causing-a-perfect-storm-for-marketing-agencies/
22. Interactive Advertising Bureau (IAB) / PwC. "Internet Advertising Revenue Report: Full Year 2024" — U.S. digital ad revenue $258.6 billion, +14.9% YoY. 2025. https://www.iab.com/news/digital-ad-revenue-2024/
23. Company and deal disclosures on private/PE ownership: DEPT (The Carlyle Group), Bounteous (New Mountain Capital), Brandtech Group (owner of Jellyfish), Deloitte Digital, McKinsey Growth/Marketing & Sales, Edelman. 2025–2026. https://thebrandtechgroup.com/the-brandtech-group-acquires-100-of-jellyfish-creating-the-worlds-no1-digital-only-marketing-group/
24. CompaniesMarketCap / StockAnalysis. Market capitalizations for Omnicom (OMC), WPP, Publicis, and Stagwell, mid-2026. https://companiesmarketcap.com/wpp/marketcap/