StoneCastle

StoneCastle runs an insured deposit network that places large cash balances across more than 1,000 banks so depositors can reach federal insurance on balances up to $100 million. Its clients include wealth managers, family offices, corporations, endowments and municipalities, and the banks in its network use the deposits as funding.

For RIAs and wealth managers, the company offers KEEP by StoneCastle, a cash program built for the advisory channel. Advisors use it to hold client cash for high-net-worth households, businesses, trusts, foundations and nonprofits, with overnight liquidity and no account fees or term commitments. A white-labeled portal with the firm's logo and its own URL tracks deposits, transactions and statements, pre-fills applications and moves money by ACH or wire. KEEP also links to Salesforce, offers single sign-on, and comes with client fact sheets, newsletters and other marketing material. Clients get one monthly statement that shows the balance held at each bank. Separate enterprise tools let companies such as non-bank lenders offer insured deposit accounts to their own customers.

StoneCastle Cash Management was founded in 2009 as part of StoneCastle Partners and launched its FICA extended-FDIC insurance product in 2010. It is based in New York. Fiserv acquired the business in December 2025.