micro-cap

or mi·cro·cap

[ mahy-kroh-kap ]
/ ˈmaɪ kroʊˌkæp /

adjective

designating a company, or a mutual fund that invests in companies, with a very small market capitalization, usually under $250 million.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019