Check for SIPC Protection. Check to make sure your brokerage accounts are protected by the Securities Investor Protection Corporation (SIPC). SIPC guarantees up to $500,000 of your invested funds (up to $100,000 in cash) in the event that your stocks or securities are stolen by a dishonest broker or the firm holding your investments fails and your assets are found missing.
Source: http://www.investopedia.com/articles/pf/08/account-protection.asp, http://tomorrowsmoney.org, http://www.katieadams.homestead.com
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