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According to Bloomberg, the Russell 2000 Index’s record one-month gain is sending danger signals to investors who remember how similar rallies in U.S. stocks came to an end.

When small-caps have outpaced larger stocks much, both indexes erased gains and fell, according to data compiled by Birinyi Associates Inc. This boosting investor concerns that the S&P 500’s 27 percent advance since March 9 will end the same way as the 24 percent rally that fizzled in January.

Steeper jumps for small-cap stocks one month into a rally are signs of indiscriminate buying and usually come before equities fall, said Cleve Rueckert, a Birinyi analyst. The Russell 2000’s 36 percent climb since March 9 is its steepest since the index began in 1979, according to Bloomberg data.

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