Question

Are organizations, such as mutual funds, insurance companies, or person funds, that pool contributions from a large number of investors, clients, or depositors to buy stock and other securities.

Answer 1

the organization that pool contribution from a large number of investors is commonly called as : Institutional investor
One of the best benefit of opening an investment institution of your own is that you can place your investment with no risk at all (since it's not your money, the clients will take all the risk)

hope this helps