This story has been updated Qualys's closing price.



) -- Security specialist


became the latest tech company to take the public plunge on Friday when it started trading on the


under the ticker symbol QLYS.

The Redwood City, Calif.-based company's offering of 7,575,000 shares was priced at $12 a share late on Thursday, at the midpoint of its range of $11 to $13.

Qualys shares opened at $12.18 and rose 7.91% to $12.95 by early afternoon trading. The company's stock closed up 18% at $14.16.

The cloud security and compliance specialist, which competes with

Check Point Software

(CHKP) - Get Check Point Software Technologies Ltd. Report



(CSCO) - Get Cisco Systems, Inc. Report

, has racked up more than 5,800 customers worldwide, touting most of the Forbes Global 100 and Fortune 100 as customers. Qualys also counts


(IBM) - Get International Business Machines (IBM) Report



(SYMC) - Get Symantec Corporation Report


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(VZ) - Get Verizon Communications Inc. Report



(DELL) - Get Dell Technologies Inc Class C Report

SecureWorks and



as partners.

According to its S-1 filing with the

Securities and Exchange Commission

, Qualys brought in revenue of $76.2 million in 2011, up from $65.4 million in 2010 and $57.4 million in 2009. For the first six months of 2012, the company's revenue was $43.4 million.

Another security specialist,

Palo Alto Networks

(PANW) - Get Palo Alto Networks, Inc. Report

, enjoyed a

successful IPO

in July. The company's shares have risen more than 15% since its offering.

--Written by James Rogers in New York.

Follow @jamesjrogers

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