For the third year in a row, fears about the European debt crisis are affecting U.S. stocks and there's more uncertainty throughout Europe than ever before.
This past weekend, the ailing Spanish banking system was potentially rescued after agreeing to a bailout of up to $125 billion. Investors are also worried that Greece may exit the euro next weekend or perhaps even sooner ahead of the June 17 elections.
Against this backdrop, investors are seeking the safest investments and want to protect their portfolios from European exposure and unpredictability.
Traditionally, U.S. Treasury notes were the safest, most predictable investment. But the yield on the 10-year note hit a record low of 1.44 percent earlier this month, which means returns are minimal.
Companies that derive revenues throughout Europe are susceptible to the fluctuations in European markets, European consumer spending, the European banking system, and general economic activity. American investors are fleeing volatile markets and retreating into cash.
A safer alternative? Investors can look to diversify their portfolios to include companies that derive 100 percent of their revenue from inside the United States.
These companies include: Lockheed Martin , Walgreen’s , Lowe’s , Wells Fargo , CVS Caremark , UnitedHealth Group , Marathon Oil , Kroger Company , Wellpoint , and Verizon .
Not only do these companies generate revenue entirely in the United States, but many of them pay a dividend that is substantially greater than the 10-year note.
Watch the video below for CNBC's Brian Sullivan's in-depth reporting on the 10 companies that fit the bill.