Employment Placement Agencies and Executive Search Services (U.S.) — NAICS 56131
A Histometrics industry-group primer for public-market and private investors
1. Overview
This is the paid-intermediary corner of the labor market: firms that get paid a one-time fee for finding a person a job, or filling an employer's opening, where the placed worker becomes the client's employee — never the agency's. The North American Industry Classification System (NAICS, the U.S. government's business-activity taxonomy) files this activity under industry 56131, which splits into exactly two child industries [1][2]:
- 561311 — Employment Placement Agencies: the high-volume, everyday recruiting business — contingency recruiters and direct-hire/permanent-placement shops filling professional, technical, clerical, and specialty roles [1].
- 561312 — Executive Search Services: the premium tier — retained "headhunters" running discreet, exclusive searches for chief executives, C-suite officers, and corporate board directors [2].
Both share the same core economics, and that shared DNA is what makes 56131 a coherent thing to own: because the placed worker is paid by the client, not the agency, almost the entire fee drops through to gross profit. There is no army of temporary workers to payroll (that is a separate, much larger, lower-margin industry — Temporary Help Services, 561320). These are capital-light, high-margin, network-driven fee businesses that behave like brokerages — and they are intensely cyclical, because hiring a permanent employee or a new CEO is one of the first commitments a company freezes when confidence drops.
What separates the two children is not how they make money but whom they place, and that single difference cascades into completely different labor forces, fee models, ownership structures, and ways to invest. This primer's job is that contrast. In short: placement is the volume business (nine of every ten people in the group, most of the establishments, a fragmented founder-owned base) and executive search is the value business (a tenth of the workforce but more than a third of the revenue, far higher pay per head, and a barbell of prestige partnerships over boutiques). Neither has a clean public pure-play; both are largely private, and both are being actively rolled up by private equity.
2. What's inside — the two children and how they differ
The whole point of looking at 56131 rather than either child alone is the contrast between them. The table below sets it out; figures are our federal ground-truth for each code (receipts from the 2022 Economic Census; employment/payroll from 2023 County Business Patterns — see Section 3 for the caveats) [3][4][5].
| Dimension | 561311 Employment Placement Agencies | 561312 Executive Search Services |
|---|---|---|
| What it places | Professional, technical, clerical, specialty, volume roles | CEOs, C-suite, division heads, board directors |
| Share of group revenue | ~$21.4B → ~63% | ~$12.6B → ~37% |
| Share of group employment | ~329,600 → ~90% | ~38,600 → ~10% |
| Pay per agency employee (payroll ÷ headcount) | ~$49,600 | ~$144,000 |
| Revenue per employee (rough productivity proxy) | ~$65,000 | ~$327,000 |
| Dominant fee model | Contingency — paid only if the hire happens; ~15–25% of first-year salary | Retained — paid whether or not a hire is made; ~30–35% of first-year total comp, staged in thirds |
| Concentration (top-4 revenue share / HHI) | CR4 10.4% / HHI 55.6 — very fragmented | CR4 23.6% / HHI 163.8 — fragmented, but more concentrated at the top |
| Ownership mix | Thousands of small founder-owned boutiques + a huge solo-recruiter tail; a few diversified public firms on top; heavy PE roll-up | Barbell: a few global brands (mostly partner-owned partnerships) over thousands of specialist boutiques; PE now the main outside door |
| Direction of travel | Structurally squeezed at the low end by job boards and AI; rebounds with labor-market churn | Supported by record executive turnover and board refreshment; the marquee end stays defensible |
| How to invest | Diversified public staffing proxies (no pure-play) + a deep private/PE roll-up base | Mostly private — one large diversified public name (Korn Ferry); PE take-privates and boutiques |
Read the two revenue-per-employee figures side by side and the whole story is there: executive search employs a tenth of the group's people but generates more than a third of its revenue, because a small number of highly paid senior consultants each bill very large fees on a handful of senior searches. Placement agencies run the opposite model — a large, more modestly paid workforce turning over a high volume of lower-value fees. (The revenue-per-employee ratio mixes a 2022 revenue numerator with a 2023 headcount denominator, so treat it as an order-of-magnitude contrast, not a precise ratio.)
Acronyms used above: CR4 = combined revenue share of the four largest firms; HHI = Herfindahl-Hirschman Index, a standard concentration gauge running toward 10,000 for a pure monopoly and under 1,500 for an "unconcentrated" market under U.S. antitrust guidelines; PE = private equity; comp = compensation.
What sits just outside 56131 (and is routinely confused with it): Temporary Help Services (561320), where the agency payrolls its own workers on assignment — the giant, lower-margin ~90% of the broader staffing market; Professional Employer Organizations (561330), which co-employ and outsource human-resources and payroll; and the online job boards and professional networks (Indeed, LinkedIn, ZipRecruiter), classified as internet-publishing/advertising platforms. All three compete for the same hiring dollar, but they are different businesses with different margins — and they matter here mostly as substitutes and disruptors (Sections 6, 8) [1][2].
3. How big it is
Our ground-truth federal figures for the group, NAICS 56131 (U.S.):
| Metric | Value | Source (year) |
|---|---|---|
| Receipts (revenue) | $33.97 billion | Economic Census (2022) [3] |
| Firms | 12,459 | Economic Census (2022) [3] |
| Establishments | 13,576 | County Business Patterns (2023) [3] |
| Paid employees | 368,130 | County Business Patterns (2023) [3] |
| Annual payroll | $21.90 billion | County Business Patterns (2023) [3] |
| First-quarter payroll | $6.08 billion | County Business Patterns (2023) [3] |
| Top-4 revenue share (CR4) | 10.2% | Economic Census (2022) [3] |
| Top-8 / Top-20 / Top-50 share | 15.3% / 23.4% / 33.6% | Economic Census (2022) [3] |
| HHI (concentration) | 43.5 | Economic Census (2022) [3] |
| SBA small-business size standard | $34 million in annual receipts | Small Business Administration (2023) [6] |
A ~$34 billion revenue industry employing ~368,000 people — but two things must be said before anyone quotes those numbers.
First, these count the agencies, not the placements. The ~368,000 employees are the recruiters, researchers, salespeople, and back-office staff who run these firms; the far larger number of workers they place into jobs are counted at their new employers, not here. Blended payroll per agency employee is about $59,500 — but that average is meaningless, because it straddles a ~$49,600 placement-agency workforce and a ~$144,000 executive-search workforce (Section 2). The receipts and payroll figures also come from different survey years and measure different things; payroll is not profit, and the federal data report no operating margin, average fee, placement volume, or total addressable market.
Second — the undercount, and read it before quoting the size. County Business Patterns counts only establishments with paid employees; it excludes the self-employed, businesses with no employees or no employer identification number, and most government workers [3]. Recruiting has an unusually large population of independent, one-person recruiters operating as sole proprietors who never appear in the 13,576 establishment count — this is where individual ownership dominates, and it is systematically invisible in employer statistics. The number of people who make a living placing candidates is meaningfully larger than these figures imply. Nonemployer businesses are tracked in a separate Census program; our ground-truth file for 56131 contains no nonemployer total, so we do not state one. Net effect: the true operator count and footprint of this group are larger than the federal employer data show, most acutely in placement's long tail of solo recruiters.
A rare clean roll-up. Unusually, the two children sum almost exactly to the group: 7,679 + 5,897 = 13,576 establishments (exact); 329,566 + 38,564 = 368,130 employees (exact); ~$21.4B + ~$12.6B ≈ $34.0B receipts; ~$16.3B + ~$5.6B ≈ $21.9B payroll [3][4][5]. The firm counts (6,270 + 6,198) slightly overstate the group's 12,459 because some firms operate under both codes. This tight additivity is a good sign the federal data for this group is internally consistent.
Concentration — even more fragmented than either child. The group's HHI of 43.5 and CR4 of 10.2% sit below both children's own figures (placement HHI 55.6; search HHI 163.8). That is not a contradiction: combining the two industries into one larger $34B denominator shrinks every firm's share, so the merged market looks even more splintered on paper [3][4][5]. The plain-English read is the same at every level — no one dominates. The largest players are big in absolute dollars but hold small slices of a huge, fractured market. (Because this is a receipts-based Census measure whose scaling convention isn't specified, the HHI is a fragmentation signal, not a Department of Justice merger-screening score.)
4. The investable universe — where value concentrates across the children
There is no pure-play, publicly traded way to own 56131. The listed names are diversified staffing and search companies in which this group's activity is a segment — so public exposure is always a proxy, and the segment mix differs sharply between the two children.
Placement (561311) — public proxies, private depth. No listed pure-play exists; placement shows up as a high-margin line inside diversified staffing firms. The practical U.S.-listed proxies are Robert Half (NYSE: RHI) — the closest large proxy, with a distinct permanent-placement line — plus ManpowerGroup (MAN), Kforce (KFRC), ASGN (ASGN), and Kelly Services (KELYA), all of which run permanent-placement lines inside larger temp/contract books [8][9]. But most of this child lives privately: Allegis Group (the largest privately held U.S. staffing company; brands Aerotek, TEKsystems, Aston Carter, Actalent), Insight Global, Express Employment International (franchise model), and The Planet Group, over a base of thousands of founder-owned boutiques actively bought by PE roll-up platforms [22].
Executive search (561312) — mostly private, and getting more so. The public menu is thin and shrinking. Korn Ferry (NYSE: KFY) is effectively the only large listed option — but it is a diversified organizational-consulting and talent-solutions company in which executive search (~$924M of fee revenue in fiscal 2026) is only about a third of the total [10]. Caldwell Partners (TSX: CWL) is a small, more search-centric Canadian listing [25]. The most prestigious pure franchises — Spencer Stuart, Russell Reynolds Associates, Egon Zehnder (with Heidrick & Struggles and Korn Ferry, the "SHREK" set) — are partner-owned and unlisted, and Heidrick & Struggles was taken private by an Advent International-/Corvex-led consortium in December 2025 (~$1.3B, $59.00/share), removing the last large U.S.-listed pure-play [11][23]. For the pure activity, private equity is now the main door.
Foreign-listed global recruiters span both children with substantial U.S. operations: Randstad (Euronext Amsterdam: RAND), Adecco Group (SIX Swiss: ADEN; includes the LHH brand), PageGroup (London: PAGE; Page Executive handles senior search), and Hays (London: HAS). Their U.S. exposure must be isolated from global results [24].
(Tickers, revenues, and market caps move constantly; the figures above are recent-period snapshots for orientation, not quotes. Underwrite these names on their placement/search net-fee revenue, not consolidated revenue dominated by temp staffing or consulting.)
5. How the money works
The unit of profit is the fee, and it scales with the pay of the role filled — so revenue is roughly number of placements × fee per placement, and both children earn most where salaries are highest (tech, finance, healthcare, senior leadership).
- The contingency model (placement's mainstay): the agency is paid only if the client hires its candidate — typically 15–25% of the new hire's first-year salary, ~20–25% for professional roles. A $120,000 hire at 22% is a ~$26,000 one-time fee. Most contingency deals carry a ~90-day guarantee — a free replacement or refund if the hire quits or is fired quickly [12].
- The retained model (executive search's standard): the firm is hired on an exclusive, non-contingent basis and is paid whether or not a hire is made — usually 30–35% of the placed executive's first-year total compensation, with minimum fees often $100,000–$200,000, billed in thirds (kickoff, shortlist, placement) [12]. Retained work gives far better cash visibility than contingency.
Across both children the defining economic facts are the same:
- Near-100% gross margin. Because the placed worker never joins the agency's payroll, the fee is almost pure gross profit, with light working-capital needs. This is a fee/brokerage business, not a labor-reselling business — the single most important thing to understand about the group [10].
- Compensation is the dominant cost, and it is sticky. The people are the business, so recruiter/consultant pay dwarfs other costs. That creates strong incremental margins on the way up (a marginal placement is almost all profit) and painful operating deleverage on the way down (you keep paying idle billers while fees dry up).
- Productivity per head is the metric. Owners track placements per recruiter and revenue per "desk" (placement), or fee revenue per consultant and senior-partner utilization (search). Korn Ferry's Executive Search segment ran a ~25.7% adjusted EBITDA margin in fiscal 2026 — a useful public benchmark for the premium end [10].
- Thin recurring revenue. Placement and search are largely one-and-done per hire, with little contractual backlog — which is why the largest search firms bolt on steadier consulting, assessment, interim, and recruitment-process-outsourcing (RPO) revenue to smooth the cycle [10].
The one structural quirk unique to search: the "off-limits" rule. Under industry ethics, a search firm generally cannot recruit away an active client's employees for one to two years. This "blockage" caps how many clients a big firm can serve in one industry — you cannot raid the companies you serve — which structurally limits scale and leaves permanent room for boutiques [12][20]. Placement agencies face no equivalent constraint.
Acronyms: EBITDA = earnings before interest, taxes, depreciation, and amortization (a rough cash-earnings proxy); RPO = recruitment process outsourcing (an employer hands its whole recruiting function to an outside provider); DSO = days sales outstanding (average days to collect a receivable — a key cash-conversion lever in a capital-light model).
6. What drives demand
Both children are discretionary, forward-looking bets on hiring confidence — among the first budget lines cut in a slowdown and among the first to rebound — but they read slightly different signals.
- The business cycle and hiring confidence drive both. Strong GDP (gross domestic product) and profit expectations lift volume and fees; uncertainty freezes permanent hiring first. The Bureau of Labor Statistics' Job Openings and Labor Turnover Survey (JOLTS) — openings, hires, quits, separations — is the standard read [14].
- Labor-market churn is placement's oxygen. Voluntary job-switching creates both openings to fill and candidates to place. Through 2025 the JOLTS quits rate sat around 1.8–2.0%, below its pre-pandemic norm — a "low-hire, low-fire, low-churn" market that starves placement agencies of activity even without mass layoffs [14]. Rising churn is the clearest bullish catalyst.
- Executive and board turnover is search's core driver. Challenger, Gray & Christmas counted 1,991 U.S. CEO exits in 2024, the most since it began tracking in 2002 [15]. Every top-level exit can trigger a retained search; board refreshment and succession add a base of demand somewhat less tied to the hiring cycle.
- Skills scarcity and new-skill waves lift both — the harder talent is to find (specialized tech, healthcare, skilled trades; AI, cybersecurity, and digital leadership at the top), the more employers pay to outsource the search.
- Wage inflation mechanically lifts revenue per placement in both children, because fees are a percentage of pay — though very steep wage growth can also make employers delay hiring.
- Private-equity portfolio hiring is a growing, steadier source of senior mandates for search as PE-backed companies staff up after acquisitions and ahead of exits.
7. Regulation
Both children are lightly regulated at the federal level, licensed state-by-state, and subject to a fast-emerging overlay of AI-in-hiring rules — there is no federal occupational license for either.
- Anti-discrimination law. As intermediaries in hiring, both are subject to federal equal-employment law — Title VII of the Civil Rights Act, the Age Discrimination in Employment Act (ADEA), and the Americans with Disabilities Act (ADA), enforced by the Equal Employment Opportunity Commission (EEOC). An agency cannot honor a client's discriminatory candidate preference; both the client and the agency can face liability [17].
- State licensing (chiefly placement). Many states (New York, Illinois, Nevada, Washington, others) require private employment agencies to be licensed and bonded and cap fees — a legacy of early-20th-century abuses when agencies charged desperate job-seekers. Consultants retained and paid only by employers, charging job-seekers nothing (the modern professional-recruiting and executive-search model), are often exempt [18]. The federal Wagner-Peyser Act of 1933 established the free public Employment Service (today's American Job Centers) as a government-funded alternative these firms compete against [18].
- AI-in-hiring rules (the growth area for both). As firms adopt automated sourcing and screening, new laws target algorithmic bias. New York City Local Law 144 requires that any Automated Employment Decision Tool (AEDT) undergo an independent bias audit, be publicly disclosed, and trigger candidate notice, with penalties of $500–$1,500 per violation per day; similar rules are spreading [16]. Federal posture has wobbled — the EEOC withdrew its AI-hiring guidance in January 2025 — but the underlying anti-discrimination statutes are unchanged and candidates can still sue [16].
- Background checks and candidate-data privacy. Running checks and using third-party consumer reports or algorithmic scores pulls firms into the federal Fair Credit Reporting Act (FCRA); the Consumer Financial Protection Bureau has confirmed these duties apply to hiring dossiers and algorithmic scores [19]. Both children hold résumés, salary history, and (in search) sensitive executive assessments, so cybersecurity, retention, and cross-border-transfer rules (California's CCPA/CPRA, the EU's GDPR) matter [19].
- Self-regulation (search). The Association of Executive Search and Leadership Consultants (AESC) sets a voluntary code covering confidentiality, conflicts, and the off-limits standard for member firms [20].
8. Competitive dynamics and consolidation
Structure: a barbell at both ends. A few large diversified players sit atop each child; a vast base of small specialist boutiques sits below — reflected in the group's low 10.2% top-four share and HHI of 43.5 [3]. Barriers to entry are low (a phone, a network, an applicant-tracking subscription), so boutiques form constantly — but real moats exist: deep candidate networks, sector specialization, national accounts, compliance scale, reputation, and repeat client relationships. In search, the off-limits rule actively protects fragmentation, because a large firm cannot poach from its own clients [12][20].
Consolidation is structural, not merely cyclical — and PE is the engine in both children. This group is a textbook roll-up: recurring client relationships, operating leverage from scale, technology synergies, and — critically — an aging cohort of founder-owners looking to exit. In placement, PE platforms buy a mid-sized "platform" firm and bolt on smaller shops; recent deal multiples ran roughly 4–4.5x EBITDA for commodity/light-industrial staffing up to 5.5–7x for high-growth IT and healthcare specialties, with deal volume dipping to ~93 transactions in 2024 amid the hiring slump before rebounding in 2025 [13]. In search, PE has moved decisively upmarket — ZRG Partners is PE-backed, and Advent/Corvex took Heidrick & Struggles private in December 2025 [11]. Korn Ferry, separately, has rolled up interim and professional-staffing firms to diversify beyond search [10].
The disruptive front: platforms and AI. The competitive threat is less another agency than technology that lets employers self-serve. Job boards and professional networks (Indeed, LinkedIn, ZipRecruiter) compress the value of a middleman for easy-to-fill roles — though these platforms are themselves under pressure: CareerBuilder and Monster's parent filed for Chapter 11 in June 2025, and Recruit Holdings (Indeed, Glassdoor) cut ~1,300 jobs in 2025 as AI reshaped the model [21]. Generative AI automates the grunt work of recruiting — sourcing, screening, outreach, scheduling — which threatens placement's high-volume, transactional low end hardest while leaving search's confidential, judgment-heavy C-suite and board work comparatively defensible. The consensus is displacement of routine tasks and a squeeze on commodity recruiting, not wholesale elimination of the human intermediary — rewarding firms that move upmarket into judgment, relationships, and hard-to-fill roles.
9. Risks
- Cyclicality above all. Both children are high-beta bets on hiring confidence; with sticky recruiter/consultant costs, profits fall hard and fast in a downturn. The 2023–2025 stretch — the U.S. staffing market declining in most months, Robert Half's permanent-placement revenue down 14% in 2024 — is the cautionary case [7][8].
- Structural disintermediation. AI sourcing/screening tools, applicant-tracking systems, in-house recruiting teams, and self-service platforms erode the fee for commoditized roles — concentrated on placement's low end. Firms that don't move upmarket face margin compression [21].
- Frozen labor market. A "low-hire, low-fire" economy (JOLTS quits stuck below normal through 2025) starves the group of activity even without a recession [14].
- Thin recurring revenue. One-and-done fees mean little backlog to cushion a slump — search partly offsets this with bolted-on advisory/interim revenue; placement largely does not.
- Fall-off, guarantee, and off-limits exposure. Weak-market hires that don't stick trigger free replacements/refunds (placement); the off-limits rule caps growth per industry (search) [12].
- Key-person / talent flight. The assets ride the elevator down every night. Star recruiters and consultants can defect and take clients and candidates; retention of billers is a perpetual risk in both children.
- Regulatory, data-security, and litigation drift. Expanding AI-hiring audit laws, FCRA/background-check and privacy rules, and discrimination liability raise compliance cost — and these firms hold résumés, identity data, salary history, and executive assessments [16][19].
- Roll-up execution risk (for private investors). PE consolidation depends on integrating people-dependent, relationship-driven shops without losing the billers — easier to model than execute, and paid-up multiples assume continued deal flow [13].
- Thin, hard-to-isolate public market. With Heidrick private and Korn Ferry diversified, and no pure-play in placement, listed investors have no clean way to own the pure activity [10][11].
- Measurement risk. Federal statistics omit nonemployers, many tiny operators, and most government workers [3], so they do not support a standalone market-growth claim for the group.
10. How to invest, and the outlook
The choice between the two children is a choice between volume and value. Placement (561311) is the bigger, more fragmented, more disruptable business, most naturally owned privately — thousands of founder-owned boutiques with plentiful succession deals, plus PE roll-up platforms consolidating specialists at ~4–7x EBITDA [13]. Executive search (561312) is the smaller, higher-margin, more defensible business, historically owned through prestige partnerships and now increasingly through PE — and its listed representation has nearly vanished.
Public routes (proxies only, no pure-play). For placement-type economics: Robert Half (RHI) and Kforce (KFRC) for professional direct-hire; ManpowerGroup (MAN), Kelly (KELYA), and ASGN (ASGN) for broader staffing with placement lines. For search: Korn Ferry (KFY) is the only large listed way in — a diversified talent-solutions firm where search is roughly a third of fee revenue — with Caldwell Partners (CWL) as a small search-centric name. For global specialist recruitment spanning both: foreign-listed Randstad (RAND), Adecco (ADEN), PageGroup (PAGE), and Hays (HAS) [8][9][10][24][25]. Underwrite all of these on permanent-placement / net-fee revenue (not consolidated revenue dominated by temp staffing or consulting), on U.S. exposure and specialty mix, on recruiter/consultant productivity, gross margin and client retention, and on cash conversion, DSO, and acquisition discipline. Read them as cyclical, capital-light, cash-returning businesses — cheap-looking at the bottom of a hiring cycle, expensive-looking at the top.
Private routes (where most of the group actually lives). Options: acquire a profitable founder-owned boutique (succession deals are plentiful in placement, earned partnership stakes in search), back or co-invest in a PE roll-up platform, or partner in a franchise/network model. Valuations cluster around 4–7x EBITDA depending on specialty and growth [13]. Diligence should center on placement/search history by recruiter/client/occupation, fee rates and repeat business, guarantee claims and candidate fall-off, dependence on the owner or a few star billers, top-client concentration and contract portability, candidate-data ownership and privacy controls, off-limits exposure (search), licensing and discrimination controls, and working capital / any acquisition debt.
Near-term drivers to watch (forward-looking): the direction of JOLTS quits and hires — a return of labor-market churn would be the clearest bullish catalyst after a long freeze [14]; executive and CEO turnover and board refreshment, which support search independent of the broader hiring cycle [15]; the rate/growth cycle and corporate confidence; wage inflation, which lifts fees per placement mechanically; the pace and shape of AI adoption — whether it hollows out transactional recruiting faster than firms can move upmarket [21]; and M&A (merger-and-acquisition) tempo, as founder-owner succession and PE conviction keep feeding a structural consolidation wave across both children [11][13]. The considered view: long-run demand for skilled human intermediation in scarce-skill, confidential, and senior roles is durable and more defensible than commodity résumé-forwarding — so within 56131 the value end (executive search and specialist placement) looks structurally sturdier than the volume/commodity end, which faces a genuine technology squeeze. Either way, this group is investable mainly through private platforms and diversified public proxies, and company-specific underwriting matters more than the industry label.
Sources
- U.S. Census Bureau, "2022 NAICS Definition — 561311 Employment Placement Agencies." https://www.census.gov/naics/?chart=2022&details=561311&input=561311
- U.S. Census Bureau, "2022 NAICS Definition — 561312 Executive Search Services." https://www.census.gov/naics/?chart=2022&details=561312&input=561312
- U.S. Census Bureau — Histometrics ground-truth dataset for NAICS 56131: 2022 Economic Census (receipts $33.972B; firms 12,459; CR4 10.2%, CR8 15.3%, CR20 23.4%, CR50 33.6%; HHI 43.5) and 2023 County Business Patterns (establishments 13,576; employees 368,130; annual payroll $21.897B; Q1 payroll $6.077B). CBP excludes nonemployers, businesses without an EIN, and most government employees. https://www.census.gov/programs-surveys/economic-census.html; https://www.census.gov/programs-surveys/cbp.html
- U.S. Census Bureau, 2022 Economic Census & 2023 County Business Patterns, NAICS 561311 — receipts ~$21.375B; establishments 7,679; employees 329,566; annual payroll $16.339B; CR4 10.4%; HHI 55.6. https://api.census.gov/data/2022/ecnsize/groups/EC2200SIZECONCEN.html
- U.S. Census Bureau, 2022 Economic Census & 2023 County Business Patterns, NAICS 561312 — receipts ~$12.60B; establishments 5,897; employees 38,564; annual payroll ~$5.56B; CR4 23.6%; HHI 163.8. https://www.census.gov/programs-surveys/economic-census.html
- U.S. Small Business Administration, "Table of Small Business Size Standards" — NAICS 561311 and 561312 threshold $34M receipts (2023). https://www.sba.gov/document/support-table-size-standards
- Staffing Industry Analysts, "US Staffing Industry Forecast" (2024–2025 updates) — total U.S. staffing market ~$184B (2024); temp ≈ 90% of staffing; permanent/direct-hire ~11%. https://www.staffingindustry.com/research/research-reports/americas/us-staffing-industry-forecast-september-2025-update
- Robert Half Inc., Form 10-K / Q4 & Full-Year 2024 Results — total revenue $5.796B; permanent-placement revenue down 14% (2024). https://www.sec.gov/Archives/edgar/data/315213/000031521325000007/rhi-20241231.htm
- ManpowerGroup Inc., 2024 Annual Report — revenue ~$17.9B; brands Manpower, Experis, Talent Solutions (RPO/MSP). https://www.sec.gov/Archives/edgar/data/871763/000095017025035519/2024_ars.pdf
- Korn Ferry, Form 10-K (fiscal year ended April 30, 2026) — Executive Search fee revenue $924.1M (~a third of ~$2.8B total); adjusted EBITDA margin 25.7%; ~80% board/CEO/senior/general-management searches; diversified consulting/digital/RPO/interim segments; entry-barriers statement. https://www.sec.gov/Archives/edgar/data/56679/000005667926000021/kfy-20260430.htm
- U.S. SEC — Heidrick & Struggles Form 8-K (merger completion) and merger proxy — Advent International/Corvex take-private completed December 2025 at $59.00/share (~$1.3B); ~$1.1B revenue (2024). https://www.sec.gov/Archives/edgar/data/1066605/000119312525313582/d832427d8k.htm
- Recruitment fee structures: TopEchelon, "Recruitment Agency Fee Structures" (contingency 15–25% of first-year salary; ~90-day guarantee); Cowen Partners, "Executive Search Firms & Fees" (retained 30–35% of first-year comp, minimums $100K–$200K, staged in thirds; contingency 20–30%); AESC off-limits/blockage standard. https://topechelon.com/blog/recruitment-agency-fee-structures/; https://cowenpartners.com/the-two-types-of-executive-search-firms-fees/
- Lyndon Advisory, "Staffing and Recruitment M&A"; Staffing Industry Analysts, "M&A Trends: North America 2025 Update" — ~93 deals in 2024, PE roll-ups, EBITDA multiples ~4–7x, majority of founders open to a sale. https://lyndonadvisory.com/guides/staffing-recruitment-ma; https://www.staffingindustry.com/research/research-reports/americas/merger-acquisition-trends-north-america-2025-update
- U.S. Bureau of Labor Statistics, "Job Openings and Labor Turnover Survey (JOLTS)"; Indeed Hiring Lab JOLTS analyses (2025) — quits rate ~1.8–2.0%, below pre-pandemic norm; low-hire/low-fire/low-churn market. https://www.bls.gov/jlt/home.htm; https://www.hiringlab.org/2025/09/30/august-2025-jolts-report-low-firing-low-hiring-low-churn/
- Challenger, Gray & Christmas / Forbes, "CEO Turnover Soars in 2024" — 1,991 U.S. CEO exits, a record since tracking began in 2002. https://www.forbes.com/sites/julianhayesii/2024/12/22/ceo-turnover-soars-in-2024-how-leaders-can-adapt-and-thrive-in-2025/
- NYC Department of Consumer and Worker Protection, "Automated Employment Decision Tools (Local Law 144)" — annual independent bias audit, disclosure, candidate notice; penalties $500–$1,500/violation/day; Holland & Knight, "AI in Hiring" (EEOC withdrew AI-hiring guidance Jan 2025). https://www.nyc.gov/site/dca/about/automated-employment-decision-tools.page; https://www.hklaw.com/en/insights/publications/2025/03/artificial-intelligence-in-hiring-diverging-federal-state-perspectives
- U.S. Equal Employment Opportunity Commission, "Coverage of Employment Agencies" — Title VII, ADA, ADEA apply to referral/screening; client and agency can share liability. https://www.eeoc.gov/employers/coverage-employment-agencies
- State licensing and the public labor exchange: USLegal, "Regulation and Licensing of Employment Agencies"; Illinois DOL, "Private Employment Agency Act"; New York State DOL, "Employment Agencies"; U.S. DOL, "Wagner-Peyser Program" (free public Employment Service, 1933, as amended by WIOA). https://employmentagencies.uslegal.com/regulation-licensing-agencies/; https://labor.illinois.gov/laws-rules/fls/private-employment-agencies-act.html; https://dol.ny.gov/employment-agencies; https://www.dol.gov/agencies/eta/american-job-centers/wagner-peyser-program
- Consumer Financial Protection Bureau, "Circular 2024-06: Background Dossiers and Algorithmic Scores for Hiring" — FCRA obligations for third-party consumer reports and hiring algorithms; candidate-data privacy (CCPA/CPRA, GDPR). https://www.consumerfinance.gov/compliance/circulars/consumer-financial-protection-circular-2024-06-background-dossiers-and-algorithmic-scores-for-hiring-promotion-and-other-employment-decisions/
- Association of Executive Search and Leadership Consultants (AESC), "About AESC / Code of Professional Practice" (founded 1959; off-limits and confidentiality standards). https://www.aesc.org/
- HR Dive, "Glassdoor and Indeed announce layoffs" (2025); DHRMap, "Job Boards Are Dying — AI Is Becoming the New Hiring Front Door" (2025) — Recruit Holdings ~1,300 HR-tech job cuts; CareerBuilder/Monster parent Chapter 11 (June 2025). https://www.hrdive.com/news/layoffs-glassdoor-indeed-ai-headwinds/752876/
- Private placement owners: Allegis Group (Aerotek, TEKsystems, Aston Carter, Actalent), https://www.allegisgroup.com/about/history; Insight Global, https://insightglobal.com/services/talent-services/; Express Employment International, https://expressfranchising.com/about-express/; The Planet Group, https://www.theplanetgroup.com/
- Private executive-search firms: Spencer Stuart (firm history), https://www.spencerstuart.com/who-we-are/firm-history; Russell Reynolds Associates (PrivCo profile), https://system.privco.com/company/russell-reynolds-associates; Egon Zehnder (about), https://www.egonzehnder.com/about-us; DHR Global, https://www.dhrglobal.com/about/; Boyden, https://www.boyden.com/canada/; ZRG Partners (PE-backed).
- Foreign-listed global recruiters: Randstad, https://www.randstad.com/investor-relations/; Adecco Group (LHH), https://www.adeccogroup.com/investor-relations; PageGroup (Page Executive), https://www.page.com/investors; Hays plc, https://www.haysplc.com/investors
- Caldwell Partners, "Investor Relations — 2024 Full-Year Results" (~C$87M revenue; Caldwell and IQTALENT brands); market-cap snapshots via Macrotrends/StockAnalysis for listed proxies. https://www.caldwell.com/executive-search-agency-investor-relations/quarterly-reports/2024-fourth-quarter-full-year-financial-results/