Brexit isn't just a European problem after all. The United Kingdom's decision to quit the European Union is costing U.S. investors a pretty penny.U.S.-based companies in the broad Russell 3000, including online advertising company Alphabet (GOOGL), software maker Microsoft (MSFT) and global bank JPMorgan Chase (JPM), have suffered a collective loss of $1.3 trillion since Friday's shocker from the United Kingdom, according to a USA TODAY analysis of data from S&P Global Market Intelligence. Nearly $300 billion in market value has been erased just from the 30 most-valuable stocks in the Standard & Poor's 500, the stocks most commonly found in U.S. investors' portfolios.

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