Analysis
NAICS 52591 is the 2022 NAICS industry for open-end investment funds, part of 5259 (Other Investment Pools and Funds).
It has only one more detailed code, 525910, which covers exactly the same activities; the definition, index entries and statistics are on that page.
Between 2018 and 2023 the number of establishments grew 134% and employment rose 99%. The 2018 count used NAICS 2017, so part of a large move can come from codes being redefined rather than from businesses opening or closing.
County Business Patterns counts 354 US establishments in this code in 2023, employing 1,820 people at an average annual payroll of $196,759 per employee (99th percentile of national industries). 75% of the establishments have fewer than five employees, which marks it as a small-business industry.
By establishments it ranks 2nd of the 2 codes at this level within Other Investment Pools and Funds, with 17.6% of them.
Official definition
See industry description for 525910.
Source: US Census Bureau, NAICS 2022 Manual.