A fund that is managed by a trust company or a bank and deals with pooled collection of trust accounts. Collective investment funds combine together the assets of several individuals and organizations to make a larger, well-diversified portfolio. The following are two kinds of collective investment funds: 

A1 Fund: A fund of collective assets given by either the holding bank or affiliated banks for the selective reason of investment and reinvestment. 

A2 Fund: A fund of collective assets given by pension, retirement, profit sharing, or other trusts that are free from from federal income tax

The thought of a collective fund is to reduce costs by economies of scale by combining profit-sharing funds and pensions. These pooled funds are collected into what is called as master trust account under the power of the bank, which acts as trustee, executor, guardian, or administrator.