The differences between a “custodian” and a “trustee” are minor. A trust is a legal entity under which assets are actually owned and held on behalf of a beneficiary. The trustee has some level of discretionary fiduciary authority over the assets of the fund. The trustee must exercise that authority in the best interests of the beneficiary. A custodial arrangement, on the other hand, is like a trust, but the custodian simply holds the assets on behalf of the owner of the assets. Other than holding the assets and doing as the owner orders, the custodian has no fiduciary obligations to the owner. The determination of what constitutes a trust or custodial arrangement is a determination made under state law.