Kelly Services (KELYA Quick QuoteKELYA - Free Report) shares rallied 5% in the last trading session to close at $19.43. This move can be attributable to notable volume with a higher number of shares being traded than in a typical session. This compares to the stock's 5.3% loss over the past four weeks.

The uptick can be attributed to the company's better-than-expected earnings and revenue performance.

This staffing company is expected to post quarterly earnings of $0.46 per share in its upcoming report, which represents a year-over-year change of -6.1%. Revenues are expected to be $1.28 billion, up 1.7% from the year-ago quarter.

Earnings and revenue growth expectations certainly give a good sense of the potential strength in a stock, but empirical research shows that trends in earnings estimate revisions are strongly correlated with near-term stock price movements.

For Kelly Services, the consensus EPS estimate for the quarter has been revised 2.1% lower over the last 30 days to the current level. And a negative trend in earnings estimate revisions doesn't usually translate into price appreciation. So, make sure to keep an eye on KELYA going forward to see if this recent jump can turn into more strength down the road.

The stock currently carries a Zacks Rank #3 (Hold). You can see the complete list of today's Zacks Rank #1 (Strong Buy) stocks here >>>>

Kelly Services is part of the Zacks Staffing Firms industry. Heidrick & Struggles (HSII Quick QuoteHSII - Free Report) , another stock in the same industry, closed the last trading session 3.2% higher at $32.48. HSII has returned -7.9% in the past month.

For Heidrick & Struggles, the consensus EPS estimate for the upcoming report has remained unchanged over the past month at $0.98. This represents a change of -14% from what the company reported a year ago. Heidrick & Struggles currently has a Zacks Rank of #3 (Hold).