# NAICS 523991: Trust, Fiduciary, and Custody Activities

Breadcrumb: [NAICS codes](https://bidrover.com/naics) › [523991 Trust, Fiduciary, and Custody Activities](https://bidrover.com/naics/523991)

This U.S. industry comprises establishments primarily engaged in providing trust, fiduciary, and custody services to others, as instructed, on a fee or contract basis, such as bank trust offices and escrow agencies (except real estate).

- NAICS code: 523991
- Title: Trust, Fiduciary, and Custody Activities
- Sector: 52 Finance and Insurance
- Subsector: 523 Securities, Commodity Contracts, and Other Financial Investments and Related Activities
- Industry group: 5239 Other Financial Investment Activities
- NAICS industry: 52399 All Other Financial Investment Activities
- SBA size standard: $47 million average annual receipts
- Open bids on BidRover: 0

## Open bids (0)

No open bids cite this code right now.

## Frequently asked questions

### What is NAICS code 523991?

NAICS 523991 is "Trust, Fiduciary, and Custody Activities" in the 2022 North American Industry Classification System, in sector 52 (Finance and Insurance). This U.S. industry comprises establishments primarily engaged in providing trust, fiduciary, and custody services to others, as instructed, on a fee or contract basis, such as bank trust offices and escrow agencies (except real estate).

### What is the SBA size standard for NAICS 523991?

A business is small under NAICS 523991 at or below $47 million average annual receipts, including affiliates (13 CFR 121.201). Confirm the standard named in each solicitation.

### How many government bids are open under NAICS 523991?

No open bid in BidRover cites NAICS 523991 right now. Many state and local notices do not list a NAICS code, so a keyword alert for this work catches more of them.

### How do I get alerts for NAICS 523991 bids?

Save an alert on this page. A free account gets new matching bids by weekly email; the Team plan ($19/mo) sends daily alerts with match scores, the buyer, source link and documents.

## Related NAICS codes

- [523940 Portfolio Management and Investment Advice](https://bidrover.com/naics/523940)
- [525920 Trusts, Estates, and Agency Accounts](https://bidrover.com/naics/525920)
- [531390 Other Activities Related to Real Estate](https://bidrover.com/naics/531390)
- [523999 Miscellaneous Financial Investment Activities](https://bidrover.com/naics/523999)
- [523910 Miscellaneous Intermediation](https://bidrover.com/naics/523910)

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Code titles and definitions: U.S. Census Bureau, North American Industry Classification System (NAICS), 2022 (https://www.census.gov/naics/). Size standards: U.S. Small Business Administration, Small Business Size Standards, 13 CFR 121.201, eCFR text current as of 2026-10-21 (https://www.ecfr.gov/current/title-13/section-121.201).

BidRover lists bids from official public sources. It is not an issuing authority; confirm the NAICS code and size standard named in each solicitation.