NAICS 523999:
Miscellaneous Financial Investment Activities
This U.S. industry comprises establishments primarily engaged in acting as agents and/or brokers (except securities brokerages and commodity contracts brokerages) in buying or selling financial contracts and those providing financial investment services (except securities and commodity exchanges; portfolio management; investment advice; and trust, fiduciary, and custody services) on a fee or commission basis.
Exchange clearinghouses, commodities or securitiesStock quotation servicesGas lease brokers' offices
Matching SIC code: 6289 Services Allied With the Exchange of Securities or Commodities, Not Elsewhere Classified (also 6211 Security Brokers, Dealers, and Flotation Companies)
Where it sits
- 52Finance and InsuranceSector
- 523Securities, Commodity Contracts, and Other Financial Investments and Related ActivitiesSubsector
- 5239Other Financial Investment ActivitiesIndustry group
- 52399All Other Financial Investment ActivitiesNAICS industry
- 523999Miscellaneous Financial Investment ActivitiesNational industry
Largest companies with NAICS 523999
Updated Nov 9, 2026| Rank | Company | Headquarters | Employees |
|---|---|---|---|
| 1 |  S&P Globalspglobal.com | New York, US | 40K |
| 2 |  Moody's Corporationmoodys.com | New York, US | 15K |
| 3 |  MSCI Inc.msci.com | New York, US | 8.2K |
| 4 |  Topsteptopstep.com | Chicago, US | 4.1K |
| 5 |  Susquehanna International Groupsig.com | Lower Merion Township, US | 4K |
| 6 |  ISS | Institutional Shareholder Servicesissgovernance.com | Rockville, US | 3.8K |
| 7 |  Galaxygalaxy.com | New York, US | 2.7K |
| 8 |  DRWdrw.com | Chicago, US | 2.5K |
| 9 |  iCapitalicapital.com | New York, US | 2.5K |
| 10 |  Bain Capitalbaincapital.com | Boston, US | 2.4K |
Not this code?
Similar activities the Census classifies elsewhere.
- 5231Securities and Commodity Contracts Intermediation and BrokerageInvestment banking, securities dealing, securities brokering, commodity contracts dealing, or commodity contracts brokering
- 523160Commodity Contracts IntermediationActing as principals or agents (i.e., brokers) in buying or selling virtual currency (cryptocurrency)
- 523210Securities and Commodity ExchangesFurnishing physical or electronic marketplaces for the purpose of facilitating the buying and selling of securities and commodities
- 522320Financial Transactions Processing, Reserve, and Clearinghouse ActivitiesFinancial transactions processing, reserve, and clearinghouse activities (except commodity or securities exchange services)
Questions about NAICS 523999
Which businesses use NAICS 523999?
What SIC code matches NAICS 523999?
How many companies have NAICS 523999?
Code titles, definitions, examples and SIC matches: NAICS 2022 and the Census concordances, US Census Bureau. Company counts and lists: Crustdata, companies with a website, each by its primary code, updated weekly. Employee counts are estimates.