Nasdaq
Commuters pass by the NASDAQ Market site in New York, May 21, 2012. REUTERS

The top after-market Nasdaq gainers Friday were Merge Healthcare Inc, AuthenTec Inc, Infinera Corporation, MannKind Corporation and Web.com Group Inc.

The top after-market Nasdaq losers were Iridium Communications Inc, Hansen Medical Inc, Exelixis Inc and National Penn Bancshares Inc.

Gainers

Merge Healthcare Inc (MRGE) shares climbed 5.74 percent to $3.50 in after-hours trading. On Thursday, the company announced the release of Merge OrthoPACSTM, a comprehensive image management and digital templating solution for orthopedics.

AuthenTec Inc (AUTH) rose 5.68 percent in post-market session to close at $4.84. The company shares have a 52-week low of $2.23, a 52-week high of $5.10 and $203.86 million in market capitalization.

Infinera Corporation (INFN) shares advanced 4.84 percent to $6.50 in post-market trading. The company shares have a 52-week low of $6.00, a 52-week high of $8.97 and $680.25 million in market capitalization.

MannKind Corporation (MNKD) shares gained 4.60 percent and reached $2.73 in after-hours trading. The company shares have a 52-week low of $1.57, a 52-week high of $3.95 and $414.51 million in market capitalization.

Web.com Group Inc (WWWW) shares surged 2.38 percent to $ 18.51 in after-hours trading Friday. The company shares have a 52-week low of $6.47, a 52-week high of $19.72 and $881.46 million in market capitalization.

Losers

Iridium Communications Inc (IRDM) slumped 5.77 percent to $ 8.98 in post-market session Friday. The provider of mobile voice and data communications services via satellite has a 52-week low of $5.50, a 52-week high of $9.73 and $697.64 million in market capitalization.

Hansen Medical Inc (HNSN) shares declined 1.40 percent to $2.12 in after-hours trading. The company stock has a 52-week low of $1.99, a 52-week high of $5.28 and $131.46 million in market capitalization.

Exelixis Inc (EXEL) shares lost 1.25 percent in after-hours trading to reach $5.91. The company shares have a 52-week low of $3.94, a 52-week high of $8.96 and 888.63 million in market capitalization.

National Penn Bancshares Inc (NPBCO) shares dropped 1.02 percent to $25.45 in after-hours trading. The company shares have a 52-week low of $24.95, a 52-week high of $26.91 and 65.38 million in market capitalization.

Management