This industry comprises legal entities, trusts, estates, or agency accounts, administered on behalf of the beneficiaries under the terms of a trust agreement, will, or agency agreement. Illustrative Examples: Bankruptcy estates Private estates (i.e., administering on behalf of beneficiaries) Personal investment trusts Testamentary trusts Cross-References. Establishments primarily engaged in-- ? Managing portfolios of trusts--are classified in Industry 523920, Portfolio Management; ? Administering personal estates--are classified in U.S. Industry 523991, Trust, Fiduciary, and Custody Activities; and ? Operating businesses of trusts and bankruptcy estates--are classified according to the kind of business operated.