Organization that insures customers of brokerage firms in the event of the bankruptcy of a brokerage firm, much the same way the FDIC insures customers of banks. The SIPC is a nonprofit corporation that is not an agency of the U.S. government. The NASD requires virtually all brokerage firms to be members of the SIPC. The only exception is firms that deal only in mutual funds and variable annuities. The SIPC is funded by assessments on member firms. The SIPC insures customers for up to $500,000 of cash and securities on deposit with a member firm. Of the $500,000, no more than $100,000 may be cash on deposit with the member.