A mutual fund company offering many mutual funds, for various objectives. Usually, investors can move assets between different funds of a family of funds at little or no cost, and can receive a single statement describing their holdings in all the funds in the family of funds. They are also known as a mutual fund family or a fund family.

A group of mutual funds offered by one investment or fund company. Generally, the constituent funds cover a wide range of  fund categories and investment objectives.

Most fund companies offer a selection of mutual funds for investors to choose from. A large fund family offers investors a number of conveniences: "one-stop" shopping for their fund investing activities, the consolidation fund investments in one monthly statement, and the opportunity to make money transfers and undertake fund exchanges within the family easily and, usually, at little or no cost.