Despite a strong job market, human resources and employment services stocks have taken a beating lately. That could signal an economic slowdown ahead. Since March 1, the S & P 1500 Composite Human Resource & Employment Services Sub-Industry has seen accelerated underperformance versus the broader S & P Composite 1500 index. Large drawdowns in the jobs-related sub-industry tend to precede recessions and larger increases in unemployment. See below for details on how stocks in the S & P 1500 Composite Human Resource & Employment Services Sub-Industry have performed in recent months.

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Persons: Dow Jones, nonfarm payrolls, Robert, ASGN, Korn, — CNBC's Michael Bloom Organizations: Industry, U.S . Bureau of Labor Statistics, ADP, Dow, Robert Half International, Wednesday, UBS, Robert Half, Kelly Services