The lexicon of the top500 ( The Encyclopedia for Classification Codes ) explains the codes and definitions in the world of economical classifications.
NAICS Code 5232 Securities and Commodity Exchanges
The NAICS Code 5232 is described as
Securities and Commodity Exchanges It belongs to the code group
NAICS Code 523 Securities, Commodity Contracts, and Other Financial Investments and Related Activities
To this Code "5232" belongs the sub codes
NAICS Code 52321: Securities and Commodity Exchanges