The Calabasas-based staffing firm On Assignment Inc. reported a 34.4 percent increase in revenues for 2011 first quarter results compared to the same period last year.

For the first quarter ended March 31, On Assignment reported net earnings of $3.2 million or $0.08 per diluted share on revenues of $129.4 million compared to a net loss of $0.3 million or $0.01 per diluted share on revenues of $96.3 million for 2010 first quarter results.

The firm provides staffing in specialty skills including laboratory/scientific, healthcare/nursing, physicians, medical financial, information technology and engineering.