The chartered institutions that hold the regulatory charter behind a non-bank fintech's accounts and card programs. Distinct from a BaaS provider (the API/platform layer in front of the charter), so this ranking differs from the BaaS leaderboard even where the same names appear — Cross River, Celtic, Thread, Bancorp, Evolve, Sutton. The most-disclosed layer in the dataset, because naming the sponsor bank is a regulatory requirement.
A sponsor bank lends its charter to a non-bank. Customer deposits sit at the sponsor bank, often FDIC-insured through it, and the bank is responsible for compliance with banking rules even though the customer only sees the fintech's brand.
Sponsor banks are usually smaller community banks that built a business around fintech partnerships. Card programs work the same way: the sponsor bank is the issuer of record on the BIN, and a processor and program manager run the program day to day.
Banks whose growth comes mostly from fintech partner programs and that sponsor many brands at once. Most-named in the Index: Evolve Bank & Trust, Cross River, Sutton Bank, Celtic Bank, Thread Bank and Lead Bank.
Banks best known as the issuer of record for prepaid, debit and credit card programs. Most-named in the Index: Pathward, The Bancorp Bank, Sutton Bank and Celtic Bank.
Banks that sponsor accounts for international payments, payouts and deposit programs. Most-named in the Index: Community Federal Savings Bank and Lead Bank.
A sponsor bank is a chartered bank that holds the deposits and the regulatory licence behind a fintech's accounts or card program. The fintech owns the brand and the customer relationship; the sponsor bank is the bank of record, and US fintechs disclose it because regulators require them to.
By number of companies linked to them through public disclosures and provider customer lists, the most-named sponsor banks are Evolve Bank & Trust (97), Cross River (64), Sutton Bank (61), Pathward (42) and Celtic Bank (39) (Embedded Finance Index, November 2026).
16.0% of the 6,596 fintech and embedded-finance companies analyzed publicly name a sponsor bank (1,055 companies, Embedded Finance Index, November 2026). That ranks the sponsor bank 3rd of the 11 stack layers the Index tracks by disclosure rate.
US rules on deposit insurance and card issuing require a fintech to say which bank holds customer funds or issues its cards, usually in the footer, terms and cardholder agreement. That makes the sponsor bank one of the most consistently disclosed layers of the stack.
The Embedded Finance Index analyzes the public infrastructure stacks of 6,596 fintech and embedded-finance companies. A provider is counted when a company names it in its own disclosures — terms, partner pages, press releases — or when the provider publicly lists that company as a customer. Counts are relationships, not revenue or volume.