Management, Scientific, and Technical Consulting Services (United States) — NAICS 5416

A rollup investor's primer. NAICS = North American Industry Classification System, the U.S. government's official scheme for sorting businesses into industries. Code 5416 is a four-digit NAICS industry group that gathers three distinct consulting worlds — management advice, environmental technical work, and "expert-for-hire" scientific/economic consulting — under one heading. This primer synthesizes the three child primers plus our ground-truth federal statistics for this level; it does not re-research from scratch.

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1. Overview

NAICS 5416 is the country's advice-and-expertise industry: firms that sell judgment by the hour rather than a product on a shelf. It spans everything from a McKinsey strategy deck to a soil-contamination report to an economist testifying in a billion-dollar antitrust trial. What ties the three children together is the business model — people, credentials, and billable hours, with almost no physical capital and the main asset walking out the door every night. What separates them is nearly everything else.

The single most useful thing an investor can know about 5416 is that it is not one market but three, with opposite demand personalities:

• 54161 Management Consulting Services — strategy, human resources, marketing, supply-chain, and telecom/utility advice. Discretionary spend, bought in good times and cut first in bad ones. By far the biggest child.
• 54162 Environmental Consulting Services — testing soil, water, and air; permits; contamination and compliance work. Legally mandated demand — the regulation is the order. The smallest child.
• 54169 Other Scientific and Technical Consulting Services — economic and litigation consulting, forensic engineering, energy/utility economics, agronomy and safety. Partly counter-cyclical — lawsuits and enforcement rise when the economy sours. The mid-sized child.

That three-way split — discretionary vs. mandated vs. counter-cyclical — is the reason a diversified position across 5416 is more balanced than any one child, and it drives who owns each segment and how you can buy in.

Two very different doors. Public-market investors cannot cleanly buy this industry: the marquee names (McKinsey, Boston Consulting Group, Bain, the Big Four accounting-and-advisory networks, and the top economic-consulting partnerships) are private, and every listed proxy is a diversified company where consulting is one slice. Private-market investors meet 5416 constantly — it is one of the most active private-equity (PE) roll-up areas in the economy and one of the most common kinds of small business to start and sell.

Our judgment: durable long-run demand and very light capital needs across all three children, but earnings that swing on consultant utilization, client budgets, talent retention, reputation, and how artificial intelligence (AI) reshapes what clients buy and how firms bill.

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2. What's inside — the three child industries and how they differ

The children are wildly uneven in size — management consulting alone is ~83% of the level's revenue — but size is the least interesting contrast. Demand character, concentration, ownership, and investability differ far more, and that contrast is the heart of this primer.

Contrast table — the three children at a glance

GDP = gross domestic product. Share of level is each child's 2022 Economic Census receipts divided by the level's $435.02 billion. CR4 = share of receipts held by the four largest firms. Firm names carry tickers in Sections 4 and 10, not here. [1][2][5][6][7]

The three contrasts that matter most

1. Demand character is a three-way split — and that is the whole investment case. Management consulting (54161) is discretionary: clients buy it when they are investing in growth, deals, or transformation, and cut it first in a downturn. Environmental consulting (54162) is mandated: a law, lender, insurer, or lawsuit requires the work, so demand tracks regulatory intensity more than the business cycle — the most defensive of the three. Other scientific/technical (54169) is partly counter-cyclical: litigation, antitrust enforcement, restructuring, and expert testimony often rise when the economy is under stress. Held together, the three children hedge one another — which is exactly why the industry group is more stable than its dominant child looks on its own.

2. Concentration is inverted from size. The smallest two children are more concentrated at the top than the biggest. The giant, management consulting, is atomized (CR4 10.9%) [7]; environmental is nearly as fragmented (CR4 12.1%) [6]; but the mid-sized "Other scientific/technical" is the concentrated one (CR4 30.9%), because a handful of economic-and-litigation-consulting houses tower over that prestige niche [7... see 54169]. So pricing power and "who has a moat" run opposite to headcount and revenue — the leaders that matter most sit inside the second-smallest child.

3. Public investability is best where the industry is not biggest. The dominant management-consulting segment is the hardest to own cleanly — its leaders are private partnerships and its listed proxies are diversified (Accenture is technology-weighted; the brokers and ad holding companies trade on other businesses). The two smaller children offer the cleaner listed bets: environmental has a genuine mid-cap proxy (Montrose) plus environment-tilted engineering majors, and "Other scientific/technical" has the closest thing to pure plays in the whole level (Exponent, Charles River Associates). Owning "consulting" in public markets means, more often than not, buying a company whose other businesses drive the stock — and the exception is the two small children, not the big one.

One cross-cutting name. ICF International is the rare firm that appears as a proxy in all three child primers — federal/telecom advisory in 54161, environmental work in 54162, and energy/utility economics in 54169 — which makes it the closest single listed vehicle to a diversified "5416 complex," though still a partial one.

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3. How big it is (federal figures for the level)

Our ground-truth federal statistics for NAICS 5416. Dollar figures originally reported in thousands are shown in billions. Receipts, firm counts, and concentration come from the 2022 Economic Census; establishments, employment, and payroll from 2023 County Business Patterns (CBP), the Census Bureau's annual count of employer businesses. [1]

CR4/8/20/50 are the share of revenue held by the largest 4, 8, 20, and 50 firms. HHI runs from near zero (many equal competitors) to 10,000 (a monopoly); U.S. antitrust agencies treat anything below ~1,500 as "unconcentrated."

What the numbers say:

• The children reconcile almost perfectly to the level. Summed across the three child primers, establishments (188,206 + 9,696 + 28,043 = 225,945) and employment (1,467,031 + 88,934 + 180,378 = 1,736,343) match the level totals exactly, annual payroll matches to the thousand (~$184.23B), and receipts and firm counts land within rounding (~$435.0B; ~211,200 vs. 211,100). This is a genuine ground-truth cross-check — the parts add up to the whole. [1][5][6][7]
• A cottage industry with a few giants. About 8 employees per establishment (1.74M ÷ 225,945) and roughly one establishment per firm — over 211,000 small shops, not a few big factories. Average revenue per firm is about $2.1 million.
• Labor is essentially the whole business. Payroll (~$184.2B) is about 42% of receipts, and average pay works out to roughly $106,000 per employee — a high-wage, white-collar workforce. Pay skews highest in senior-heavy management consulting (~$108k) and lowest in field-technician-heavy environmental work (~$85k), with scientific/technical in between (~$101k).
• The level looks more fragmented than any of its children — which is misleading. The aggregate CR4 is just 10.8% and HHI 43.6, below every child measured on its own (54161 HHI 47.5; 54162 HHI 62.6; 54169 CR4 30.9% with HHI suppressed). Pooling three different service markets into one code dilutes concentration: a firm that dominates litigation-economics does not compete head-to-head with an environmental boutique or a marketing shop. Read the level's 10.8% four-firm share as understating the pricing power the leaders hold within the one segment that actually has scaled leaders — economic/litigation consulting inside 54169. [1][7]

The undercount caveat — important, and different at each end. These employer-based counts understate the industry, for three reasons the child primers detail:

1. Nonemployer omission (the small end). CBP counts only businesses with paid employees and omits the vast population of nonemployer consultants — one-person advisory practices filing as sole proprietors. Professional, scientific, and technical services is one of the largest nonemployer categories in the country, so the true population of "consultants" runs far beyond ~211,000 employer firms. The bias is strongest where small/individually owned shops dominate — solo management consultants, independent agronomists and safety consultants, and one-person environmental boutiques. [3][4]
2. Classification leakage (the top end). NAICS files each establishment under its primary activity, so brand-name firms spread revenue across several codes. A McKinsey or Deloitte books strategy in 54161, technology elsewhere, and HR in yet another code; the big diversified engineering firms (AECOM, Jacobs, WSP, Stantec) do enormous environmental work that books mostly under Engineering Services (541330), never landing in 54162; and giant economic-consulting arms report under their parent's primary code, not 54169. No single code captures any of the majors in full. [1][6]
3. Broader private definitions run higher. Private research houses, using wider boundaries, size each child above its federal receipts figure — the broad U.S. "management consulting" market above $400 billion, environmental consulting near $27 billion (and all environmental services near $94 billion), and a broad "scientific & economic consulting" basket near $62 billion. [6... IBIS][9]

Our federal file carries no industry-wide margin, utilization, billing-rate, or backlog series for the level — those are company-by-company, not Census, figures, and are not stated here where absent.

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4. The investable universe (where value concentrates across the children)

For public-market investors, pure exposure barely exists, and value concentrates in different listed vehicles depending on the child. Scale markers are total-company revenue, not the NAICS-code slice.

ACN, BAH, etc. trade on the NYSE or Nasdaq (Nasdaq Stock Market); FY = fiscal year.

Where the industry actually sits — the private owners:

• Elite management-strategy partnerships: McKinsey (~$16B), BCG (~$13.5B), Bain (~$7B), plus the Big Four advisory networks (Deloitte, PwC, EY, KPMG) — closed to outside capital, and mostly inside 54161. [5]
• Employee-owned prestige experts (54169): Analysis Group, The Brattle Group, Cornerstone Research, NERA, Compass Lexecon — the top economic/litigation partnerships, which stay independent because partner economics and culture, not capital, drive them. [7]
• Large employee-owned environmental firms (54162): Terracon, Brown and Caldwell, Geosyntec, SWCA — largely closed to outside investors. [6]
• PE-owned platforms spanning children: Guidehouse (Bain Capital, $5.3B); Berkeley Research Group (TowerBrook, 2025); ERM (KKR); SLR (Ares) — how institutional capital owns the scaled middle across both management and scientific/environmental work. [11][12]
• The tail: well over 150,000 boutiques and independents across the three codes — the true bulk by firm count.

Bottom line: the deepest public exposure lives in the two smaller children — Exponent and CRA for the scientific/litigation niche, Montrose and Tetra Tech for environmental — plus diversified Accenture, the ad holding companies, and insurance brokers that anchor pieces of management consulting. The dominant management-consulting core and the prestige economic-consulting leaders are private-market games.

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5. How the money works

All three children run the same professional-services engine, so the economics generalize across the level. Revenue per professional is roughly:

bill rate × utilization × realization, amplified by staffing leverage (the junior-to-senior pyramid).

• Bill rate — what the firm charges per hour or day for a given seniority.
• Utilization — the share of a professional's available hours actually billed to clients. Idle ("bench") time is pure cost, so a few points move profit sharply. It is the single most-watched operating metric.
• Realization — how much of the standard rate is actually collected after discounts, scope creep, and fixed-fee overruns.
• Leverage — profit comes from billing junior staff well above their cost; wider pyramids amplify margins but need a steady flow of routine work to keep juniors busy.

Where the money-machine differs across the children:

• Margins. Highest in 54169 — economic/litigation and expert-testimony work commands premium rates and revenue per professional (~$297k of receipts per employee vs. ~$246k for management and ~$241k for environmental). Environmental (54162) runs the thinnest, low-to-mid-teens EBITDA (earnings before interest, taxes, depreciation, and amortization) on net revenue, because subcontractor and lab pass-throughs and field costs dilute the labor spread.
• Recurring vs. project mix. Environmental has the most annuity-like base (monitoring, permit renewals, mandated reporting). Scientific/technical is lumpier (case-driven), but its counter-cyclical litigation work smooths the overall cycle. Management is the most project- and confidence-driven.
• Contract risk. Time-and-materials and cost-plus pass cost risk to the client; fixed-price work (common in environmental remediation and some transformation projects) puts overrun risk on the firm; government work adds backlog visibility but exposes firms to appropriations and bid protests.

Because there is almost no physical capital, strong firms throw off cash — the constraint is talent, not money. But the same lightness cuts both ways: with payroll ~42% of receipts and staff costs largely fixed in the short run, a hiring surge into weak bookings compresses margins fast.

The AI wildcard runs through all three, unevenly. Generative AI (software that produces text, code, and analysis) is both a demand driver (clients pay for help adopting and governing it) and a threat to the billable-hours model (it can automate the junior "grind" that fills the pyramid). Exposure differs sharply: management consulting (routine research, marketing execution) is most exposed; litigation/expert-testimony franchises in 54169 are best insulated (a credentialed human must still testify); environmental field and compliance work is talent-gated more than automatable. [5][7]

What investors watch (public or private): organic growth, utilization, realization, revenue per professional, bookings/backlog (book-to-bill), attrition of senior "rainmakers," recurring-vs-project mix, and cash conversion. For private firms, reported profit must be normalized for owner/partner compensation before it means anything.

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6. What drives demand

The three children answer to different masters, which is what makes the group balanced:

• The business cycle and confidence move management consulting (54161) most — discretionary spend on growth, deals, and transformation, cut first in a downturn.
• Regulatory intensity moves environmental consulting (54162) most — work is mandated by statute, permits, lenders, insurers, and lawsuits. The decade's biggest catalyst is PFAS ("forever chemicals") remediation following the U.S. Environmental Protection Agency's (EPA's) 2024 drinking-water limits, alongside water-infrastructure spending, the energy transition and data-center buildout, and real-estate/M&A-linked site assessments. [6][16]
• Litigation, enforcement, and deals move other scientific/technical (54169) most — antitrust, intellectual-property, securities, and product-liability disputes; merger reviews; forensic investigations after recalls or catastrophes; and utility rate cases. Much of this is counter-cyclical. [7]
• The AI double-edge touches all three — a tailwind for advisory demand (adoption, safety, governance) and a deflationary threat to routine billable hours.
• Government budgets and policy matter wherever firms sell to Washington — currently a headwind (Section 9) that hits government-facing names across all three children.

A shared proxy: the U.S. Bureau of Labor Statistics (BLS) projects employment of management analysts — a closely related occupation spanning much of the level — to grow 9% from 2024 to 2034, faster than average. That is an occupational forecast, not a revenue forecast, but it points the same direction: above-average, if uneven, growth. [14]

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7. Regulation

Consulting is one of the least directly regulated professional services: with narrow exceptions (some licensed engineering and scientific sub-fields), no license is required to hang out a consulting shingle, and there is no single overseeing agency — a key reason all three children have such long tails of solo operators. Regulation bites at the edges and, crucially, is often the product itself:

• The rules are frequently the demand. Environmental work exists because of the statutory stack — the National Environmental Policy Act (NEPA), Clean Air Act, Clean Water Act, Resource Conservation and Recovery Act, Superfund, and Safe Drinking Water Act (which carries the PFAS limits). Rule changes generally mean more billable work; rule simplification can erode it. [6][16]
• Litigation admissibility governs 54169. Expert testimony lives or dies by the Daubert standard and Federal Rule of Evidence 702 (tightened December 2023); the aggressiveness of the Department of Justice, Federal Trade Commission, Securities and Exchange Commission, and Federal Energy Regulatory Commission sets the volume of work. [7]
• Government contracting rules bind whoever sells to the federal government across all three: the Federal Acquisition Regulation (FAR), General Services Administration schedules, defense supplement (DFARS), and FAR organizational-conflict-of-interest rules that can bar a firm from advising both sides. The Small Business Administration sets receipts-based size standards (e.g., $19 million average annual receipts for 54169) that govern federal small-business eligibility. [5][7]
• Auditor independence. The Sarbanes-Oxley Act and the Public Company Accounting Oversight Board restrict the Big Four from selling many consulting services to audit clients — the central tension in separating audit from advisory. [5]
• Reputational and legal risk is existential. The landmark case: McKinsey agreed in December 2024 to pay $650 million to resolve criminal and civil investigations into its opioid-related work with Purdue Pharma — the first time a management-consulting firm was held criminally responsible for advice that aided a client's crime. [15]

Forward-looking judgment: expect procurement scrutiny of consultants (transparency, conflicts, value-for-money) to intensify across all three children, even as the core activity stays largely license-free.

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8. Competitive dynamics and consolidation

A barbell market, in three copies. Every child shows the same shape — a small number of large, branded players above a very long tail of boutiques and independents — which is why the level's aggregate concentration is so low. The moat is intangible everywhere: trusted senior relationships, sector credentials, security clearances, proprietary data and methods, and the ability to connect analysis to implementation. The asset walks out the door every night, so talent is both moat and risk.

Consolidation runs hard, from several directions:

• Serial strategic acquisition. Accenture is the industry's most active acquirer, closing dozens of deals a year across management-consulting capabilities; in environmental, strategic roll-up acquirers (Tetra Tech, Stantec, WSP, NV5, Montrose) grow substantially by buying smaller firms — WSP's ~$3.3 billion acquisition of TRC (2026) is the marquee recent deal. [5][10]
• PE roll-ups of the fragmented middle. Consulting is one of the most active PE consolidation lanes: trackers counted over 1,000 consulting-firm acquisitions globally in 2024, and environmental-focused PE add-ons rose roughly 69% year over year in 2025 (median ~1.4× revenue) as sponsors chased recurring, regulation-driven revenue. Guidehouse (Bain Capital, $5.3B), Berkeley Research Group (TowerBrook), and ERM (KKR) illustrate sponsor appetite across children. [6][11][12]
• The prestige core resists consolidation. The top economic-consulting partnerships (Analysis Group, Brattle, Cornerstone) and the elite strategy houses (McKinsey, BCG, Bain) stay independent and employee-owned because partner economics and culture, not capital, drive them. [5][7]

Integration risk — cultural fit, partner retention, client conflicts, and revenue leaving with departing talent — is the common constraint. The squeeze falls on the middle: mid-size independents caught between scaled giants, nimble AI-augmented freelancers, and increasingly capable in-house client teams.

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9. Risks

Shared across the level, with the child most exposed noted:

• Cyclicality vs. mandate vs. counter-cyclicality. A downturn hits the three children differently — hard on management consulting (discretionary), gently on environmental (mandated), and can even help parts of scientific/technical (litigation, restructuring). Concentrating in the wrong child at the wrong point in the cycle is the core risk.
• AI disruption. Generative AI can compress the pyramid economics that generate profit and lower the barrier for clients to work in-house (management-consulting execution and routine research most exposed; expert-testimony franchises best insulated). [5][7]
• Government-spending shocks. In 2025–26 a federal push to cut outside consulting — via the "Department of Government Efficiency" (DOGE) initiative and contract reviews — put tens of billions of future fees under review and triggered layoffs and terminations across children: management (Deloitte, Booz Allen), environmental (USAID cancellations pulled ~$686M of Tetra Tech funding), and scientific/technical (ICF's U.S.-federal revenue down ~12.6% year-over-year; Guidehouse and Booz Allen terminations). [6][13]
• Talent risk. Departing rainmakers can take client relationships; wage inflation and attrition erode margins in all three.
• Reputational and legal risk. Conflicts, bad advice, or a scandal can be existential for a trust-based business — the McKinsey opioid case is the cautionary example. [15]
• Fixed-price and execution risk. A bad cost estimate turns an attractive project into a loss; failed implementation or remediation invites litigation (most acute in environmental remediation and fixed-fee transformation work).
• Regulatory-direction risk cuts both ways. For environmental, deregulation trims mandated work (2025–26 NEPA rollbacks, PFAS-deadline extensions); for the rest, rule simplification or automation of routine compliance can erode billable hours — while new rules create them.
• Private-market opacity, public-market dilution. Private firms disclose little; listed "consulting" proxies are diversified companies whose share prices are driven mainly by other businesses (IT, engineering-and-construction, ad cycles, insurance broking), making clean valuation unreliable.

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10. How to invest and the outlook

Public routes — evaluate by actual exposure, not the word "consulting," and note that the cleanest bets sit in the two smaller children.

• Purest proxies (in 54169): Exponent (EXPO) for science-plus-expert-testimony, and Charles River Associates (CRAI) for listed economic/litigation consulting, are the closest to clean bets in the entire level; FTI Consulting (FCN) carries the largest dollar exposure through its economic-consulting segment. [7]
• Environmental (54162): Montrose (MEG) is the cleanest listed proxy (small-cap, acquisition-driven, no dividend); Tetra Tech (TTEK) is the most environment-tilted major; AECOM, Jacobs, WSP, Stantec, NV5, and ICF trade on engineering-and-construction multiples rather than a distinct environmental premium. There is no dominant pure environmental-consulting exchange-traded fund (ETF). [10]
• Management consulting (54161): Accenture (ACN) is the only name touching several sub-segments — the closest thing to a diversified proxy, though technology-weighted; Booz Allen (BAH) and ICF (ICFI) for federal exposure (and current federal-cost-cutting risk); FTI, Huron (HURN), and CRA for counter-cyclical restructuring and litigation; ad holding companies (Omnicom, Publicis) and insurance brokers (Marsh, Aon) for the marketing and HR slices. [8]
• Cross-cutting: ICF (ICFI) is the single name that appears across all three children.

Key diligence questions apply everywhere: How much revenue is genuinely consulting versus technology, engineering, broking, or outsourcing? Is growth organic or acquired? Are utilization, realization, attrition, bookings, and backlog improving? How concentrated are customers and federal contracts? Reserve valuation work (price-to-earnings, enterprise-value-to-EBITDA, dividend yields) for security selection; these are people businesses with thin balance sheets, so cash generation and organic growth matter more than assets, and a labor-heavy consultancy should not get a software multiple.

Private routes — where the fragmented middle actually lives.

• Private equity is the primary way to own the scaled middle across every child — buyout and growth funds are actively rolling up boutiques (Guidehouse, Berkeley Research Group, ERM, SLR, and many environmental and management platforms). [11][12]
• Direct ownership / founder economics: small consulting firms are among the most common businesses to start and sell; valuations key off recurring revenue, senior-team retention, and client concentration, with profit normalized for owner pay.
• The prestige cores remain closed to outside capital — elite strategy partnerships (McKinsey, BCG, Bain), Big Four advisory arms, and the top economic-consulting and employee-owned environmental firms. [5][6][7]

Outlook (forward-looking judgment). The long-run demand story — complexity, technology waves, regulation, litigation, and deal activity — is intact, and the level has grown ahead of GDP for years. But the three children will diverge:

• Environmental (54162) is the most defensive — mandated, regulation-anchored demand (PFAS, water, energy transition), cooling from a 2023–24 surge to solid mid-single-digit growth, with consolidation as a durable lever.
• Other scientific/technical (54169) is the most counter-cyclical and highest-margin — litigation/antitrust/IP demand is structurally firm and cushions downturns; the energy transition supports its economics work; federal spending is the key near-term swing factor for its government-facing names.
• Management consulting (54161) keeps the best long-run discretionary demand but absorbs the sharpest near-term crosscurrents — a real federal-spending shock and the toughest AI question for its pyramid.

The strongest firms in every child will pair trusted advice with implementation, proprietary tools, and recurring revenue; commodity staff-augmentation and easily automated research are the most exposed to price pressure. Treat NAICS 5416 as a portfolio of three different demand personalities, not one sector — discretionary, mandated, and counter-cyclical — where public investors get the cleanest exposure through the two smaller children (Exponent, CRA, Montrose, Tetra Tech) plus diversified Accenture, while the dominant management-consulting core and the prestige economic-consulting leaders remain a private-market game.

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Sources

1. U.S. Census Bureau, ingested federal statistics for NAICS 5416 — receipts, firms, establishments, employment, annual and Q1 payroll, CR4/8/20/50, HHI (2022 Economic Census and 2023 County Business Patterns). Histometrics ground-truth file. See also https://data.census.gov/ and https://www.census.gov/programs-surveys/cbp.html
2. U.S. Census Bureau, "2022 Economic Census — Establishment and Firm Size (Concentration) Statistics," receipts and concentration by NAICS. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
3. U.S. Census Bureau, "County Business Patterns Methodology" and "Nonemployer Statistics" (coverage exclusions: self-employed, nonemployers, most government). https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
4. U.S. Census Bureau, "2022 Economic Census FAQ" (coverage excludes nonemployers and self-employed). https://www.census.gov/programs-surveys/economic-census.html
5. Child primer 54161 (Management Consulting Services) — receipts ($360.09B), CR4 10.9%, HHI 47.5, ownership mix (McKinsey/BCG/Bain, Big Four, PE roll-ups), unit economics, and demand/regulation detail, with underlying Census and company sources.
6. Child primer 54162 (Environmental Consulting Services) — receipts ($21.4B), CR4 12.1%, HHI 62.6, engineering-code classification leakage, PFAS and mandated-demand drivers, PE and employee-owned ownership, with underlying Census, EPA, and company sources.
7. Child primer 54169 (Other Scientific and Technical Consulting Services) — receipts ($53.5B), CR4 30.9% (HHI suppressed), economic/litigation-consulting concentration, employee-owned partnerships, Exponent/CRA/FTI investable universe, with underlying Census, FRE 702, and company sources.
8. Accenture plc, "Fourth-Quarter and Full-Year Fiscal 2025 Results" (~$69.7B revenue; ~$10.9B free cash flow). https://newsroom.accenture.com/
9. IBISWorld market-size cross-checks — U.S. management consulting >$400B; environmental consulting ~$27B; scientific & economic consulting ~$62B (2024–2026, wider definitions), via child primers 54161/54162/54169. https://www.ibisworld.com/united-states/
10. Tetra Tech, Montrose Environmental (MEG), and WSP/TRC disclosures (Tetra Tech ~$5.44B FY2025; Montrose ~$0.83B 2024; WSP ~$3.3B TRC acquisition, 2026), via child primer 54162. https://investor.tetratech.com/ and https://www.wsp.com/
11. Guidehouse, "Guidehouse Completes Transaction with Bain Capital" ($5.3B, 2023); ERM/KKR majority investment (2021), via child primers 54161/54162/54169. https://guidehouse.com/ and https://www.erm.com/
12. TowerBrook Capital Partners, "Strategic Investment in Berkeley Research Group" (2025); Capstone Partners, "EHS Market Update" (PE add-ons +69.2% YoY; ~1.4× median EV/revenue), via child primers 54162/54169. https://www.towerbrook.com/ and https://www.capstonepartners.com/
13. Fortune / Devex / ICF International reporting — DOGE and federal contract cuts (>$60B fees under review; Tetra Tech ~$686M USAID funding pulled; ICF U.S.-federal revenue down ~12.6% YoY; Guidehouse/Booz Allen terminations), 2025–26, via child primers 54161/54162/54169. https://fortune.com/ and https://www.devex.com/
14. U.S. Bureau of Labor Statistics, "Management Analysts: Occupational Outlook Handbook" (+9% employment, 2024–2034). https://www.bls.gov/ooh/business-and-financial/management-analysts.htm
15. U.S. Department of Justice, "Resolution of Criminal and Civil Investigations into McKinsey & Company's Work with Purdue Pharma" ($650M total), Dec. 2024, via child primer 54161. https://www.justice.gov/opa/pr/
16. U.S. Environmental Protection Agency, "Per- and Polyfluoroalkyl Substances (PFAS)" — final National Primary Drinking Water Regulation (2024), via child primer 54162. https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas