Jerome Powell, Chair, Board of Governors of the Federal Reserve speaks during a conference at the Federal Reserve Bank of Chicago on June 4, 2019 in Chicago, Illinois.

Many investors believe the Federal Reserve is set to start cutting interest rates, possibly as early as this week. And history shows one group of stocks stands out after the Fed begins cutting.

Health-care stocks outperform the market by about 7% in the nine months after a rate reduction, data compiled by Barclays shows. And what makes the group special relative to other groups is its consistency of performance following eases.