The top after-market NYSE losers on Monday are: K-Sea Transportation Partners, GMX Resources, WellCare Health Plans, McMoRan Exploration, Flotek Industries, Interoil Corp, McKesson Corp and Harmony Gold Mining.

K-Sea Transportation Partners LP (NYSE:KSP) shares declined 7.14 percent to $4.80 in aftermarket trading session after surging 66 percent in the regular session. The stock has a 52 week low of $3.80 and 52 week high of $15.36 and has 19.13M outstanding shares.

GMX Resources, Inc. (NYSE:GMXR) shares declined 2.62 percent to $5.95 in afterhours trading session. Its shares surged 10.69 percent in regular trading session. The stock has a 52 week low of $3.98 and 52 week high of $15.00 and has 30.90M outstanding shares.

WellCare Health Plans, Inc. (NYSE:WCG) shares declined 2.39 percent to $29.38 in afterhours trading session.

McMoRan Exploration Co. (NYSE:MMR) shares declined 1.62 percent to $17.00 in afterhours trading session. The stock has a 52 week low of $8.18 and 52 week high of $19.80 and has 106.17M outstanding shares.

Flotek Industries, Inc. (NYSE:FTK) shares declined 1.52 percent to $5.17 in afterhours trading session.

Interoil Corp (NYSE:IOC) shares declined 1.45 percent in to $74.06 in afterhours trading session.

McKesson Corp (NYSE:MCK) shares declined 1.17 percent to $70.38 in afterhours trading session. The company announced on Saturday that it has completed its acquisition of US Oncology, a leading integrated oncology company that serves one of the nation’s largest networks of community-based oncologists.

Harmony Gold Mining Co. Ltd. (NYSE:HMY) shares declined 1.12 percent in afterhours trading session.

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