Other Support Services (U.S.) — NAICS 5619

An investor's rollup primer. NAICS (North American Industry Classification System) code 5619 is a four-digit "industry group" — one rung above the five- and six-digit industries and one rung below the three-digit subsector. It sits inside NAICS 561, Administrative and Support Services, which in turn sits inside Sector 56, Administrative and Support and Waste Management and Remediation Services. 5619 is the residual group: it collects the support-service industries that are left after the named ones — office administration, facilities support, staffing, business support (call centers, billing), travel arrangement, security and investigation, and services to buildings and dwellings — have been pulled out. What remains are three unrelated industries bundled under one code [1].

1. Overview

"Other Support Services" is not a market. It is an accounting bin that holds three businesses which have almost nothing in common except that each sells a service to other organizations rather than to consumers:

• Packaging and Labeling Services (56191) — outsourced "co-packers" that pack, label, and imprint goods their clients still own.
• Convention and Trade Show Organizers (56192) — the companies that own and run the recurring industry shows an entire vertical builds its year around.
• All Other Support Services (56199) — a grab-bag of niche route trades: document shredding, physical inventory counting, retail merchandising, auto repossession, highway work-zone flagging, pool cleaning, auctioneering, meter reading.

For an investor the useful fact about 5619 is that it is a contrast, not a theme. The three children run on radically different economics — one is a thin-margin physical-labor business, one is a high-margin franchise-media business, one is a fragmented tail of asset-light route services. They do not compete with each other, do not move on the same cycle, and are not owned by the same kinds of investors. Treating 5619 as a single "sector bet" is a category error; the value is in telling the three apart. What they do share is one structural feature every investor should internalize: none of the three has a clean U.S.-listed pure-play, and all three are, first and foremost, private and private-equity (PE — investment firms that buy whole companies, often with debt) territory.

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

The four-digit group holds three five-digit industries, each of which happens to contain a single six-digit national industry (so 56191≈561910, 56192≈561920, 56199≈561990). Here is the contrast that matters:

EBITDA = earnings before interest, taxes, depreciation and amortization, a proxy for operating cash generation.

Read the row differences, not the group average. Packaging is the most capital- and labor-intensive and the lowest-margin. Trade-show organizing is the economic outlier — genuinely attractive, media-franchise economics, the one child where the business itself (not just consolidation) is the reason to invest. "All Other" is the biggest and most fragmented — half the group's receipts, well over half its firms and employees — but it is really a dozen separate micro-markets wearing one code.

For the full treatment of each — named companies, deal history, per-segment economics — read the three child primers (561910, 561920, 561990).

3. Size (this level's rollup figures)

From our ground-truth federal statistics for NAICS 5619. Receipts, firm count and concentration come from the 2022 Economic Census; establishments, employment and payroll come from 2023 County Business Patterns (CBP — the Census Bureau's annual establishment-level count). These are different programs and reference years, so do not stack them into one income statement or chain them into a growth rate.

How the receipts split across the three children (2022 Economic Census): All Other Support Services ~$29.7 billion (~50%), Convention & Trade Show Organizers ~$17.4 billion (~29%), Packaging & Labeling ~$12.4 billion (~21%) [2]. By headcount the tilt toward "All Other" is even sharper — it holds roughly 56% of the group's 307,764 employees, versus ~27% for trade shows and ~17% for packaging [3]. Two quick reads from figures within the same source and year: revenue per firm is highest in packaging (~$6.3 million, reflecting larger plants) and lowest in trade shows and "all other" (~$2.7–2.8 million, reflecting many small operators), while average pay runs from ~$49,000 (packaging) to ~$57,000 (all other) per worker — the profile of a labor-based, small-business group [2][3].

Concentration is essentially nil at this level. The four largest firms hold just 7.6% of receipts (CR4), the top eight 12.5% (CR8), the top twenty 20.4%, and the top fifty only 30.6%; the Herfindahl-Hirschman Index (HHI — a standard 0–10,000 concentration gauge where under 1,500 is "unconcentrated") is 29.8 [2]. That is lower than any single child (the children's HHIs run 75–148) — and it overstates how meaningful the number is, because the group aggregates three markets that never compete. A near-zero HHI here reflects arithmetic (three unrelated industries pooled together), not a single fought-over arena.

Undercount caveat — read before quoting the ~$59.5 billion. These are employer-firm figures, and all three children are undercounted, each for a different reason, so the group total is a floor:

• Trade shows (56192): the single largest omission. The nonprofit trade associations that own roughly half of major U.S. conventions are classified as business associations (NAICS 813910) and fall entirely outside this code; one large organizer's management estimates associations control about half the market [11]. The commercial-organizer receipts counted here capture only part of the real exhibition economy.
• All Other (56199): dominated by nonemployer operators — single-truck repossessors, two-person pool routes, solo auctioneers — which CBP and the Economic Census exclude. Third-party directories list ~31,000 companies in the code versus ~12,600 employer establishments, and pool service alone (broadly defined) is estimated at ~125,000 businesses [16]. Our ground-truth file carries no nonemployer figure, so the omission cannot be quantified; the direction is unambiguous.
• Packaging (56191): excludes nonemployer co-packers, and the same work done inside manufacturers and third-party-logistics warehouses is coded elsewhere; private "contract packaging" estimates using a broader definition commonly run $20–25 billion versus the ~$12.4 billion federal figure [6].

Our ground-truth file for 5619 reports no margin, capacity, capital-expenditure, or growth figure for the group; none is invented here. The U.S. Small Business Administration (SBA) size standards for these industries sit near $19.5–20 million in average annual receipts — a program-eligibility threshold, not a market estimate [4].

4. Investable universe — where value concentrates across the children

Because there is no company whose business is "Other Support Services," public-market exposure is always indirect, diluted, and segment-level. Value clusters differently in each child:

• Packaging (56191): no listed pure-play. Public proxies carry co-packing as a minority line — Sonoco (NYSE: SON) in packaging materials, Ryder (NYSE: R) and GXO Logistics (NYSE: GXO) in value-added logistics, Thermo Fisher (NYSE: TMO) via Patheon in regulated-pharma packaging, and CCL Industries (TSX: CCL.B) in labels [7]. The genuine pure-plays — PCI Pharma Services, Sharp Services, MSI Express — are private / PE-owned [8].
• Trade shows (56192): the last U.S.-listed pure-play, Emerald Holding, was taken private by funds managed by Apollo Global Management (NYSE: APO) in 2026 [10]. Remaining listed exposure is foreign and diversified (large information-and-events groups in London and continental Europe); the biggest owners are PE portfolios, family firms, and nonprofit associations [11].
• All Other (56199): fractional exposure only — shredding inside Iron Mountain (NYSE: IRM) and WM (NYSE: WM) (via its Stericycle/Shred-it acquisition); auctions via RB Global (NYSE: RBA); retail field-execution and inventory counting via Advantage Solutions (NASDAQ: ADV) and SPAR Group (NASDAQ: SGRP); pool-demand read-through via Pool Corp (NASDAQ: POOL) and Leslie's (NASDAQ: LESL) [12][13][16]. Traffic control, repossession, and meter reading are almost entirely private and PE-backed (e.g., AWP Safety, RoadSafe) [14].

The common lesson: in every child the pure economics live in private hands, and every public "play" requires isolating the relevant slice before applying any multiple. Full ticker tables and private-owner lists are in the three child primers, Section 4.

5. How the money works

Three different money machines under one roof:

• Packaging is a fee-for-work service. The client owns the goods and usually the materials, so revenue is payment for labor, machine time, and floor space — priced per-unit, per-hour, or per-project, with materials passed through at a thin handling margin. Margin levers are line utilization, changeover speed, labor productivity, and automation. Regulated segments (pharmaceutical, cosmetics) earn stickier, better margins than commodity food-and-beverage co-packing [6].
• Trade-show organizing is a franchise/media business. The unit of value is a single recurring show that sells exhibitor booth space (the largest line, priced as net square feet times a rate the category leader can push up), sponsorship, attendee registration, and a growing year-round digital-and-data layer. Cash is unusually good because of high operating leverage (most edition costs are fixed), negative working capital (exhibitors and attendees prepay; the venue is paid later), and a franchise moat (the #1 show in a niche is a local monopoly). The offset is single-edition risk (Section 9) [11].
• All Other is a bundle of route businesses. The good niches sell recurring, contracted service — a shredding console emptied on schedule, a pool cleaned weekly, meters read monthly, a store reset each cycle — priced per-visit, per-count, per-pound, or as a fixed monthly fee. Profit turns on route density (stops per truck-mile) and labor utilization; the model is asset-light but working-capital-sensitive because payroll precedes payment. Some sub-segments are project-linked instead of subscription (work-zone traffic control tracks construction spend; repossession tracks lender charge-offs) [12][13].

The through-line for investors: all three are labor-based and asset-light-ish, which is exactly why PE likes them — but the margin ceiling differs radically (packaging thin, all-other middling, trade shows genuinely high). Our ground-truth file carries no group-wide margin or utilization data, so each business must be underwritten on its own economics.

6. Demand drivers

The shared driver is outsourcing — organizations keep handing non-core chores to specialists. Beneath that, the niche drivers diverge and, importantly, do not correlate:

• Packaging: brand outsourcing of non-core packaging; new-product and stock-keeping-unit (SKU) proliferation; e-commerce and direct-to-consumer (DTC) shipping; private-label growth; and pharmaceutical/food-safety outsourcing (relatively defensive) [6].
• Trade shows: business-to-business (B2B) marketing budgets (face-to-face exhibiting remains a top marketing channel); the health of each show's specific vertical; business travel and international attendance; and the proven resilience of in-person deal-making after the pandemic [11].
• All Other: credit conditions drive repossession (~1.9 million U.S. vehicles recovered in 2024); infrastructure and construction spending drive work-zone traffic control; retail and warehouse activity drives inventory counting and store execution; data-privacy law drives secure shredding; housing and sunbelt migration drive pool service [12][15][16].

Because these cycles are unrelated, the group does not self-diversify — a construction slowdown, a retail recession, and a weak convention year are independent events.

7. Regulation

There is no single regulator for 5619; each activity inherits the rules of whatever it touches, and the pattern across all three children is that regulation is fragmented but frequently demand-creating:

• Packaging inherits its client's product rules. The heaviest is pharmaceuticals: drug packagers run U.S. Food and Drug Administration (FDA) current Good Manufacturing Practice (cGMP) systems and comply with the Drug Supply Chain Security Act (DSCSA) serialization mandate — compliance acts as a moat that protects regulated co-packers from commodity price competition [9].
• Trade shows face local permitting and fire/occupancy codes, union labor jurisdiction at major convention centers (the sharpest operational rule), the Americans with Disabilities Act (ADA), marketing/data rules, antitrust exposure where competitors gather, and the tax-exempt treatment association-run shows enjoy [11].
• All Other is a patchwork: secure shredding is effectively mandated by data-protection law (FACTA Disposal Rule, HIPAA, GLBA); repossession is state-licensed and federally overseen by the Consumer Financial Protection Bureau (CFPB); traffic control follows the federal Manual on Uniform Traffic Control Devices (MUTCD) and state Department of Transportation prequalification; auctioneering is state-licensed; and all labor-heavy operators face wage-hour and safety rules [12]. (FACTA = Fair and Accurate Credit Transactions Act; HIPAA = Health Insurance Portability and Accountability Act; GLBA = Gramm-Leach-Bliley Act.)

In several niches — pharma packaging, secure shredding, certified traffic control — regulation creates the demand and raises entry barriers, which is where the more durable moats sit.

8. Consolidation

The federal data show near-zero concentration (CR4 7.6%, HHI 29.8) [2], but that number is the wrong lens: it aggregates three non-competing arenas, so it can never rise no matter how much consolidation happens within a niche. The real story is that PE buy-and-build is the defining strategy in all three children — always within a niche, never across the group:

• Packaging: PE has rolled regional co-packers into national platforms (PCI Pharma Services, Sharp Services, MSI Express), with food-and-beverage and specialty labeling especially active [8].
• Trade shows: the winning move is to acquire category-leading shows one at a time and apply a common playbook (pricing discipline, proprietary data, digital add-ons); because the assets are cash-generative and cheap to integrate, the roll-up is nearly self-financing — Apollo's 2026 take-private of Emerald is the latest signpost [10][11].
• All Other: disciplined consolidators have assembled scale niche-by-niche — AWP Safety and RoadSafe in traffic control, the WIS–RGIS–Acosta reshuffle in inventory/merchandising, shredding rolled into Iron Mountain and (via Stericycle) WM [12][14].

So consolidation is real and accelerating, but it will keep showing up as niche platforms rather than as rising federal concentration at the 5619 level.

9. Risks

• No pure public vehicle in any child. Every public route is a diluted slice inside a differently-classified company; adjacent-code proxies may not be true peers.
• Labor-cost and turnover exposure. All three are wage-intensive (average pay ~$49–57k across the children); inflation, turnover, and worker-classification disputes compress margins quickly [3].
• Customer concentration. Losing one national account can hurt a small operator in any of the three.
• Uncorrelated niche cyclicality. The pieces do not hedge each other — packaging tracks consumer and pharma demand, trade shows track B2B budgets and travel, "all other" tracks credit, construction, and retail.
• Technology displacement. Automation in co-packing, smart meters versus manual meter reading, computer vision/RFID versus manual counting, and digital records shrinking the paper to shred — the most manual, lowest-value niches erode first.
• Single-event tail risk (unique to trade shows). A travel halt (pandemic, disaster, strike, geopolitical shock) can zero out an edition's revenue while fixed costs — and, for leveraged owners, debt — continue; 2020 proved this tail is existential [11].
• PE leverage and thin disclosure. Consolidators pay up and use debt; many large private operators publish no audited financials.
• Measurement risk. Employer-only statistics undercount all three children (associations outside the trade-show code, nonemployers across "all other," and off-code packaging work), so the group is genuinely hard to size.

10. How to invest & outlook

Public route (indirect, always diluted). No child offers a clean listed pure-play. Analyze each name by segment, not as a "sector" bet, and isolate the co-packing / trade-show / route slice before applying a multiple: packaging via Sonoco, Ryder, GXO, Thermo Fisher/Patheon, CCL; trade shows via foreign-listed events groups or a sliver of Apollo (which now owns the former U.S. leader); "all other" via Iron Mountain, WM, RB Global, Advantage Solutions, or SPAR, with Pool Corp/Leslie's as pool read-throughs [7][10][12][13][16].

Private route (where the group actually trades). Direct ownership or PE-style buy-and-build in a chosen niche is the mainstream path — most operators qualify as small businesses under the SBA thresholds [4]. Match the child to the mandate: trade-show organizing is the quality/margin play (media-franchise economics, but mostly private now and carrying single-event tail risk, so diligence at the show-brand level — rebooking, contracted revenue, venue and labor commitments); all other offers the longest consolidation runway (biggest, most fragmented, thousands of nonemployer targets); packaging is the defensive outsourcing tailwind but stays low-margin, so value accrues to operators that automate and specialize.

Outlook. Do not underwrite 5619 as one number. The three children point in different directions: packaging has intact structural tailwinds (outsourcing, e-commerce/DTC, pharma serialization) but a thin-margin ceiling; trade-show organizing is a mature, fully-recovered, low-single-digit-growth industry whose structural demand for face-to-face B2B contact looks durable; and "all other" is selectively constructive (infrastructure spend, auto-credit stress, privacy mandates) against an automation headwind. Because official data undercounts all three — most dramatically the association half of trade shows and the nonemployer tail of "all other" — the private consolidation runway is longer than the ~$59.5 billion employer figure implies. Underwrite the individual niche, the individual company, and the ownership structure — never the group.

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Sources

Federal figures are from our ground-truth file for NAICS 5619; company, market, and regulatory citations are drawn from the three child primers (561910, 561920, 561990), where they are carried in full.

1. U.S. Census Bureau, 2022 NAICS — definitions and structure for Sector 56, subsector 561, and industry group 5619 (industries 56191 / 56192 / 56199). https://www.census.gov/naics/?year=2022
2. U.S. Census Bureau, 2022 Economic Census — receipts, firm counts, and concentration statistics (CR4 7.6%, CR8 12.5%, CR20 20.4%, CR50 30.6%, HHI 29.8), NAICS 5619 and children. https://www.census.gov/programs-surveys/economic-census.html
3. U.S. Census Bureau, County Business Patterns: 2023 — establishments (20,809), employment (307,764), annual payroll (~$16.89B), first-quarter payroll (~$4.05B), NAICS 5619 and children. https://www.census.gov/programs-surveys/cbp.html
4. U.S. Small Business Administration, Table of Small Business Size Standards (NAICS 561910 ≈ $19.5M; 561920 ≈ $20M average annual receipts), effective 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau, County Business Patterns methodology and Nonemployer Statistics (coverage exclusions — nonemployer, government, in-house). https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html; https://www.census.gov/programs-surveys/nonemployer-statistics.html
6. Contract-packaging market and definition — child primer 561910; Mordor Intelligence and Precedence Research (broader "U.S. contract packaging" ~$20–25B). https://www.mordorintelligence.com/industry-reports/united-states-contract-packaging-market; https://www.precedenceresearch.com/contract-packaging-market
7. Diluted packaging proxies — child primer 561910: Sonoco (NYSE: SON), Ryder (NYSE: R), GXO Logistics (NYSE: GXO), Thermo Fisher/Patheon (NYSE: TMO), CCL Industries.
8. Private/PE packaging platforms and M&A — child primer 561910: PCI Pharma Services, Sharp Services, MSI Express; Capstone Partners, Packaging M&A Update (2025). https://www.capstonepartners.com/insights/report-packaging-ma-update/
9. U.S. Food and Drug Administration, cGMP (21 CFR Parts 210–211) and Drug Supply Chain Security Act (DSCSA) — child primer 561910. https://www.fda.gov/drugs/pharmaceutical-quality-resources/current-good-manufacturing-practice-cgmp-regulations; https://www.fda.gov/drugs/drug-supply-chain-integrity/drug-supply-chain-security-act-dscsa
10. Emerald Holding taken private by funds managed by Apollo Global Management (NYSE: APO), 2026 — child primer 561920.
11. Trade-show economics, association ~half-of-market estimate, and demand/risk drivers — child primer 561920 (Convention and Trade Show Organizers, Sources 5–35).
12. Shredding, traffic control, and route-service economics/regulation — child primer 561990: Iron Mountain (NYSE: IRM); WM (NYSE: WM) / Stericycle-Shred-it acquisition (closed Nov 2024). https://investors.wm.com/news-releases/news-release-details/wm-completes-acquisition-stericycle
13. Auctions and retail field-execution proxies — child primer 561990: RB Global (NYSE: RBA), Advantage Solutions (NASDAQ: ADV), SPAR Group (NASDAQ: SGRP).
14. PE traffic-control platforms — child primer 561990: AWP Safety (Kohlberg & Co.) and RoadSafe (Investcorp/Trilantic). https://www.prnewswire.com/news-releases/awp-safety-backed-by-kohlberg--co-announces-strategic-acquisition-301891696.html
15. Repossession volume (~1.9M U.S. vehicles recovered, 2024) — child primer 561990; Resolvion, Repo Industry Statistics (2025). https://resolvion.com/22-repo-industry-statistics-trends-analysis/
16. Nonemployer undercount evidence — child primer 561990: SICCODE directory (~31,097 companies) and PoolDial (~125,000 pool-service businesses); pool read-throughs Pool Corp (NASDAQ: POOL) and Leslie's (NASDAQ: LESL). https://siccode.com/naics-code/561990/support-services; https://pooldial.com/resources/articles/business/pool-industry-statistics-2026