Mont. Code § 32-1-706
Each common trust fund established hereunder is a separate and distinct entity from the fiduciary relationships participating in the fund. No fiduciary, in administering a participating fiduciary relationship, may be required to make any apportionment or allocation between the principal and income of such relationship different from that made for the common trust fund. No such participating fiduciary relationship or person having an interest in the relationship may have or be considered to have any ownership in any particular property of the common trust fund; but each participating fiduciary relationship shall have a proportionate undivided interest in the fund and its income; and the ownership of all property of the common trust fund shall be in the trustee of the fund.
§ 32-1-706, MCA