Insperity Inc. (NYSE: NSP) revenue rose 5.4 percent in the second quarter to $547.3 million on a year-over-year basis. The Houston-based professional employer organization reported the increase came because of a 2.0 percent increase in the average number of worksite employees paid per month and a 3.4 percent increase in revenue per worksite employee per month.

The revenue number beat analysts’ estimates of $546.9 million.

Second-quarter gross margin improved to 17.9 percent from 16.8 percent in the year-ago quarter.

Net income fell 37.9 percent in the second quarter to $3.5 million. However, the quarter includes a $2.7 million non-cash impairment charge related to the company’s investment in The Receivables Exchange, a firm that allows companies to sell their receivables.

Insperity Inc. (NYSE: NSP)
 For the second quarter ended June 30, 2013, compared with the same period in the previous year.
 Revenue: $547.3 million, +5.4 percent
 Net income: $3.5 million, -37.9 percent