Fidelity National Information Services, known as FIS, sells the software that banks run on. Its core processing systems handle deposits, loans and payments for thousands of financial institutions, contracts that last many years because replacing a bank's central ledger is a rare and risky event. A capital markets division serves asset managers, insurers and trading firms with treasury and risk platforms. After separating its merchant payments arm, Worldpay, the company refocused on this steadier institutional software base.