noun
trust company
A financial institution that manages assets, estates, or trusts on behalf of clients.
信託会社に資産の管理を任せている。
I have entrusted the management of my assets to a trust company.
信託銀行 is a trust bank, a type of bank that also handles trust services, while 信託会社 is a broader term for any trust company, not necessarily a bank.
Compound of 信託 (trust, entrusting) and 会社 (company).