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Bottom-up NAICS industry primers written for both public-market and private investors. Leaf industries are researched from the ground up; every group, subsector, and sector above them reads as a contrast across the industries beneath it.

2122 industries · 24 sectors · NAICS 2022

Researched with AI assistance from official U.S. statistics and independent sources, with citations on every page. Figures are not individually verified against pinned evidence — primers marked Evidence-verified are. Industry research, not investment advice. Methodology.

IndustryNAICS 52592Finance and Insurance

Trusts, Estates, and Agency Accounts (NAICS 52592): An Investor's Primer

1. Overview

North American Industry Classification System (NAICS) code 52592 is a NAICS industry — the five-digit level of the taxonomy — named Trusts, Estates, and Agency Accounts. It is one of the odder entries in the federal statistical system: it does not describe a business you can staff or run for profit, but the legal arrangements themselves — personal trusts, decedents' estates, bankruptcy estates, and agency accounts — that hold and pass on assets on behalf of beneficiaries under the terms of a trust agreement, will, or agency agreement. [1] These entities are the plumbing through which a large share of American household wealth is held, protected, and handed down.

For any investor, public-market or private, the key fact is the same at this level as at the detailed one below it: you cannot own a trust as a security or a business. What is investable is the fiduciary-services franchise — the trust banks, custodians, independent trust companies, and wealth managers that administer these entities and earn fees on the assets inside them. NAICS 52592 maps the demand for fiduciary administration, not a set of ownable companies.

2. What's inside — and why this level equals its one child

NAICS is a nested hierarchy. This five-digit industry (52592) contains exactly one six-digit national industry:

  • 525920 — Trusts, Estates, and Agency Accounts.

Because there is only one child, the industry and the child are the same universe of activity — the code simply repeats itself with a trailing zero. Census gives 52592 no content beyond what sits in 525920: the same personal trusts, testamentary trusts, private estates, bankruptcy estates, personal investment trusts, and settlement trust funds. [1] The reason the government still splits the level in two is bookkeeping consistency, not a difference in what is being counted.

Everything of substance therefore lives one level down. This page is a short signpost; for the full treatment — how trusts and estates are structured, who acts as trustee, how fiduciaries make money, and the complete regulatory picture — read the child primer for [525920]. The remaining sections give this level's own figures and the shortest possible orientation.

3. Size (this level's rollup figures)

We have no ingested ground-truth federal stat metrics for NAICS 52592 — our internal statistics file for this node is empty, so every figure below is drawn from cited external sources rather than our own ingested data, and is labeled as such. Because 52592 equals its single child 525920, the child's figures are this level's figures; nothing needs to be summed across siblings.

Standard business statistics essentially do not see this industry. Trusts and estates are legal entities that generally have no paid employees — administration is done by outside fiduciaries counted under other NAICS codes. The Census Bureau's Statistics of U.S. Businesses (SUSB) program excludes NAICS 525920 outright, [5] and its Nonemployer Statistics program excludes the entire NAICS 525 sector. [6] So there is no reliable federal establishment, employment, payroll, or revenue figure, and no federal concentration ratio, for this code. The one industry-specific federal number is a Small Business Administration (SBA) size standard of $40 million in average annual receipts — an eligibility threshold, not a measure of industry size. [4]

The activity becomes visible only in tax and bank-regulatory data (all figures from cited sources):

  • Tax filings. About 3.19 million Form 1041 fiduciary income-tax returns are filed annually, with estates and trusts remitting roughly $74.6 billion a year in federal income tax (gross collections). Because a trust is taxed only on income it retains, these collections badly understate the income these entities generate. [2]
  • Assets at insured banks. At Federal Deposit Insurance Corporation (FDIC)-insured banks, personal trust and agency accounts held about $1.27 trillion at year-end 2024 — the best-measured corner of the whole. [7]
  • The much larger, only-partly-counted whole. The research firm Cerulli Associates projects $124 trillion of wealth will change hands through 2048 (the "great wealth transfer"), most of it routed through trusts and estates. [3]

Undercount caveat. Even summed, these sources undercount the industry: because ownership is dominated by small and individual arrangements (a family living trust, an estate opened at death, a special-needs trust) — many held by individual trustees, registered investment advisers (RIAs), and non-bank trust companies that no single agency tallies — trillions more sit outside every official count. Read the absence of a market-size figure as a coverage gap, not evidence the activity is small. The honest summary: trusts and estates hold many trillions of dollars of U.S. private wealth. [7]

4. Investable universe (where value concentrates)

With a single child, all of the investable value sits in 525920's fiduciary layer — there is no second industry to weigh it against. There is no pure public "trust and estate" stock, because the trusts themselves are not companies. Public-market investors own the theme through the fiduciaries whose fee income rises with trust, estate, and custody assets; none is a pure play. The clearest listed exposure is Northern Trust (NTRS), the closest thing to a pure trust-and-wealth bank, alongside the custodian giants BNY (BK) and State Street (STT) and the wealth/trust arms inside JPMorgan (JPM), Bank of America (BAC), U.S. Bancorp (USB), and M&T Bank (MTB) (which owns Wilmington Trust). [10][11][12] Private-market value concentrates in independent, non-depository trust companies (many chartered in South Dakota, Nevada, Delaware, Wyoming, and Alaska), private-wealth firms, and RIA/administrative-trustee platforms that private equity is rolling up. The full list, tickers, and provider-reported scale are in the [525920] primer.

5. How the money works

Two economic engines sit inside this one industry. The trust or estate itself is a pass-through wealth vehicle, not a profit center: it holds a portfolio and earns income that is either distributed to beneficiaries (and taxed on their returns) or retained (and taxed to the trust on a compressed schedule that hits the top 37% federal bracket at only ~$15,000 of income). [2] The fiduciary that administers it is where investors make money, on the economics of an asset-based service business: fees charged as a percentage of assets under administration/custody (AUA/AUC) and assets under management (AUM), so revenue rises and falls with markets. A real-world anchor: FDIC-insured banks earned about $5.2 billion in personal-trust and agency fee income on ~$1.27 trillion of assets in 2024 — a blended rate near 41 basis points (0.41%). [7] The revenue is recurring, sticky, and multi-generational, but grinds against fee compression. See [525920] for fee-rate mechanics, the managed-vs-non-managed mix, and float income.

6. Demand drivers

The drivers for the industry are the drivers for its one child: the $124 trillion great wealth transfer through 2048 (the biggest tailwind); [3] an aging, affluent population (the U.S. 65-and-older population reached 61.2 million, 18.0%, in 2024); [17] a newly permanent $15 million federal estate, gift, and generation-skipping transfer (GST) tax exemption from 2026, which shifts demand away from pure tax avoidance and toward control, asset protection, privacy, and succession; [16] the growing complexity of private and illiquid assets; and state-law competition among trust-friendly states. [9] Market levels and interest rates move asset-based fees and float income directly.

7. Regulation

Regulation applies at the administrator level, not the trust level. National banks and national trust companies with fiduciary powers are governed by the Office of the Comptroller of the Currency's (OCC) Regulation 9 (12 CFR Part 9); [14] state-chartered trust companies answer to state banking departments; and banks report fiduciary assets on Schedule RC-T of their quarterly Call Reports. [7] Trustees owe strict duties of loyalty and prudence under state law (the Uniform Prudent Investor Act and, in most states, the Uniform Trust Code). [15] Advisers with custody meet the Securities and Exchange Commission (SEC) custody rule; employee-benefit trusts fall under the Employee Retirement Income Security Act (ERISA); anti-money-laundering (AML) rules apply to covered institutions; and trusts and estates file Form 1041. [2] The full regime is detailed in [525920].

8. Consolidation

The custody end is a scale oligopoly (BNY, State Street, JPMorgan, Northern Trust); personal trust is fragmented across national and regional banks, independent trust companies, RIAs, and family offices. [11][12] Consolidation runs through bank and trust-company mergers (M&T owns Wilmington Trust; WSFS owns Bryn Mawr Trust; UMB expanded via Heartland Financial in January 2025), [16][17] steady state-charter migration to South Dakota, Nevada, and Delaware, [9] and RIA convergence into trustee services. The direction of travel is toward fewer, larger fiduciary platforms.

9. Risks

The risks are those of 525920: market risk (asset-based fees fall when markets fall); fee compression from index funds and low-cost RIAs; fiduciary liability and conflicts (trustees can be surcharged for imprudent investing or breaches of duty); operational and cyber risk; policy reversal (the $15 million exemption is "permanent" only until Congress changes it); rate sensitivity of deposit float; and, for public investors, bank-parent risk — trust earnings do not insulate the parent's credit and capital risk. Private trust-company stakes offer sticky revenue but thin disclosure and heavy regulatory-approval requirements.

10. How to invest & outlook

How to invest. Buy the fiduciaries, not the trusts. Public routes run through the listed trust and custodian banks and the wealth/trust arms of the big banks — watching fee-based revenue growth, AUC/A and AUM net flows, the managed-vs-non-managed mix, and margins in the wealth/trust segment rather than the whole bank. Private routes run through equity stakes in independent trust companies and RIA platforms, technology-enabled fiduciary roll-ups, or (for wealthy families) chartering a single-family private trust company. Underwrite the operating company, not the client assets. Full mechanics are in the [525920] primer.

Outlook. The structural demand picture is unusually strong: a multi-decade, $124 trillion wealth transfer, an aging affluent population, rising asset complexity, and a permanent $15 million exemption that keeps planning activity high while shifting it toward durable non-tax motives. [3] The likely winners are scaled, technology-enabled fiduciaries and the trust-friendly states that keep attracting charters. [9] The fiduciary-services layer around trusts and estates is a durable, high-margin, annuity-like business riding one of the largest wealth transfers in history — attractive for its stickiness, cyclical with markets, and grinding against long-run fee pressure. The largest risk to the thesis is not that trusts disappear; it is fee compression or a major operational failure that erodes client trust.

Because NAICS 52592 is a single-child pass-through, this page intentionally stays short. For full detail on structure, providers, economics, regulation, and risks, see the child primer: [525920] Trusts, Estates, and Agency Accounts.**

Sources

  1. U.S. Census Bureau, 2022 NAICS Definition — 525920 Trusts, Estates, and Agency Accounts (with cross-references to 523940 and 523991), 2022. https://www.census.gov/naics/?details=525920&input=525920&year=2022
  2. Internal Revenue Service, Data Book, 2025 (Publication 55B) — Form 1041 returns ≈ 3.19 million; estate and trust income-tax gross collections ≈ $74.6 billion, 2025. https://www.irs.gov/pub/irs-pdf/p55b.pdf
  3. Cerulli Associates, Cerulli Anticipates $124 Trillion in Wealth Will Transfer Through 2048, 2024–2025. https://www.cerulli.com/press-releases/cerulli-anticipates-124-trillion-in-wealth-will-transfer-through-2048
  4. U.S. Small Business Administration, Table of Small Business Size Standards (NAICS 525920 = $40 million average annual receipts), 2023. https://www.sba.gov/document/support-table-size-standards
  5. U.S. Census Bureau, About Statistics of U.S. Businesses (SUSB) — coverage excludes NAICS 525920, 2026. https://www.census.gov/programs-surveys/susb/about.html
  6. U.S. Census Bureau, Nonemployer Statistics — coverage excludes the NAICS 525 sector, 2026. https://www.census.gov/econ/overview/mu0500.html
  7. Federal Deposit Insurance Corporation, Quarterly Banking Profile, Fourth Quarter 2024 — Trust Services and Schedule RC-T aggregates, 2025. https://www.fdic.gov/quarterly-banking-profile/quarterly-banking-profile-fourth-quarter-2024
  8. South Dakota Public Broadcasting, Assets in South Dakota trusts top $800 billion (2025) and South Dakota trust assets valued above $900B (2026). https://www.sdpb.org/politics/2025-05-28/assets-in-south-dakota-trusts-top-800-billion
  9. Northern Trust Corporation, 2025 Annual Report / Form 10-K (≈ $18.7T AUC/A; ≈ $1.8T AUM, year-end 2025). https://www.sec.gov/Archives/edgar/data/73124/000007312426000024/ntrsannualreport_2025.pdf
  10. BNY (The Bank of New York Mellon Corporation), Fourth Quarter 2025 Results / 2025 Form 10-K ($59.3T AUC/A; $2.2T AUM, year-end 2025). https://www.bny.com/corporate/global/en/about-us/newsroom/press-release/bny-reports-fourth-quarter-2025-results-130455.html
  11. State Street Corporation, Fourth-Quarter and Full-Year 2025 Financial Results ($53.8T AUC/A; $5.7T AUM, year-end 2025). https://investors.statestreet.com/investor-news-events/press-releases/news-details/2026/State-Street-Corporation-NYSE-STT-Reports-Fourth-Quarter-and-Full-Year-2025-Financial-Results/default.aspx
  12. U.S. Securities and Exchange Commission, M&T Bank Corporation 2025 Form 10-K (Wilmington Trust). https://www.sec.gov/Archives/edgar/data/36270/000003627026000010/mtb-20251231.htm
  13. U.S. Securities and Exchange Commission, UMB Financial Corporation — 2025 Form 10-K and Completion of Heartland Financial USA Merger (Jan 31, 2025). https://www.sec.gov/Archives/edgar/data/920112/000119312525018916/d827906d8k.htm
  14. Office of the Comptroller of the Currency, 12 CFR Part 9 — Fiduciary Activities of National Banks (Regulation 9) and Comptroller's Handbook: Personal Fiduciary Activities. https://www.ecfr.gov/current/title-12/chapter-I/part-9
  15. Uniform Law Commission, Uniform Trust Code (36 states + D.C.) and Uniform Prudent Investor Act. https://www.uniformlaws.org/committees/community-home?CommunityKey=193ff839-7955-4846-8f3c-ce74ac23938d
  16. Morgan Lewis, Estate Tax Alert: New $15 Million Federal Exemption Becomes Law (One Big Beautiful Bill Act) (2025), and IRS, Tax Inflation Adjustments for Tax Year 2026. https://www.morganlewis.com/pubs/2025/08/estate-tax-alert-new-15-million-federal-exemption-becomes-law
  17. U.S. Census Bureau, Older Adults Outnumber Children in 11 States… (65+ population 61.2 million, 18.0%, in 2024), 2025. https://www.census.gov/newsroom/press-releases/2025/older-adults-outnumber-children.html
  18. U.S. Securities and Exchange Commission, Custody of Funds or Securities of Clients by Investment Advisers (qualified-custodian requirement). https://www.sec.gov/files/rules/final/ia-2176.htm
  19. U.S. Department of Labor, Fiduciary Responsibilities under ERISA. https://www.dol.gov/general/topic/health-plans/fiduciaryresp