Fidelity's FDIC-Insured Deposit Sweep Program details

In utilizing the Program, your uninvested cash balance is swept to a program bank where the deposit is eligible for FDIC insurance. If you have more than $245,000 in uninvested cash in your account, the Program will maximize your eligibility for FDIC insurance by allocating uninvested cash across multiple program banks. We currently have about 20 banks available for Fidelity Cash Management and IRA accounts (although new deposits at any point in time are subject to bank capacity limits). Assuming all the banks have available capacity, a customer could have up to $5 million of uninvested cash covered by FDIC insurance