SIPC
Also called: Securities Investor Protection Corporation, SIPC insurance
SIPC protects US brokerage customers if their broker fails, covering up to $500,000 in securities including $250,000 of cash. The critical distinction from deposit insurance is what it covers: SIPC restores missing assets, it does not compensate for investments that fell in value. It also doesn't cover most commodities, futures or unregistered investments.