Gundlach predicts a 3% yield on the 10-year Treasury will spell the end of the bull market

The best indicator of when the bull run in stocks will end could be coming in the bond market, DoubleLine Capital's Jeffrey Gundlach said. In fact, the "bond king" thinks that should the 10-year Treasury note yield hit 3 percent, that would be an ominous sign for all types of risk assets, including both equities and high-yield bonds.

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