updated 8/2/2010 7:07:59 PM ET 2010-08-02T23:07:59

Although unemployment numbers haven't been improving this summer, there are businesses out there that are hiring aggressively. You just have to find them.

Forbes and the online job-posting aggregator have put together a list of the 10 midsize companies that have the most postings right now for jobs earning more than $40,000 a year. We define midsize companies as those with between 150 and 2,500 employees. slideshow: Companies hiring the most right now

Most of the biggest hirers right now are in the health care and information technology fields, and Regeneron Pharmaceuticals tops the list. Regeneron is joined by fellow health care hirers Molina Healthcare and NuVasive, a medical device company that specializes in spinal surgeries.

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Based in San Diego, NuVasive has experienced explosive growth since going public in 2004, when it reported $38 million in revenue. In 2010 its revenues will likely approach $500 million, thanks in large part to its Maximum Access Surgery system, which reduces surgery time and recovery time for spinal surgeries using specialized medical devices and software.

The company’s expansion continues to drive its hiring of new sales employees worldwide. The company hopes it will soon employ 500 sales reps as it grows into a billion-dollar company, says Patrick F. Williams, vice president of finance & investor relations.

Appearing among the biggest hirers in information technology for the first time is F5 Networks, based in Seattle. F5 sells hardware and software to large companies for a variety of IT needs, from data consolidation to security. Demand spiked in the 2010 fiscal year from customers including large airlines, universities and social media websites.

“Because of sales growth and demand for our products, we’ve been adding between 80 and 100 hires per quarter,” says Alane Moran, F5’s director of corporate communications. “We’ve added close to 300 positions since last October.” F5’s aggressive employment growth is helped along by a 7 percent annual job turnover rate, half the industry standard of 15 percent, Moran says.

Supermicro, which designs and manufactures computer servers, is also new among the biggest hirers, having enjoyed sustained organic growth. The company actually managed to increase its market share when the recession hit, and in the quarters following the collapse of Lehman Brothers the company hired engineers rapidly.

“It is very important that during tough times you don’t stop that R&D” says Don Clegg, Supermicro's vice president of marketing. “That allows us to build more customized servers for each client company.”

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