Financial Dictionary
Grinder
A slang term for a person who works in the investment industry and makes small amounts of money at a time on small investments, over and over again.
Investopedia Commentary
Grinders are typically hard-working and highly respected investors who value every cent they make off of investments. Grinders who are investment advisors keep in regular contact with their clients.
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See also: Active Management, Broker, Broker-Dealer, Gunslinger, Investment Advisor