The top after-market NYSE gainers Friday were Black Hills Corp, Chico's FAS, Covidien, Oxford Resource Partners and Box Ships Inc. The top after-market NYSE losers were Jacobs Engineering Group, Veolia Environnement, Tetra Technologies, D.R. Horton and LifeLock Inc.

Gainers

Black Hills Corp. (BKH) shares surged 3.80 percent to $37.12 in post-market trading. The stock has a 52-week low of $30.29, a 52-week high of $37.00 and $1.58 billion in market capitalization.

Chico's FAS, Inc. (CHS) shares surged 3.18 percent to $18.48 in post-market trading. The analysts at FBR Capital Wednesday downgraded shares of CHS to a “market perform” rating from an “outperform” rating with a price target of $18.00.

Covidien Plc. (COV) shares advanced 2.95 percent to $57.97 in post-market trading. The stock has a 52-week low of $44.52, a 52-week high of $60.81 and $26.66 billion in market capitalization.

Oxford Resource Partners LP (OXF) shares rose 2.21 percent to $4.40 in post-market trading. The company’s stock plunged 4 percent in regular trading.

Box Ships Inc. (TEU) shares gained 2 percent to $4.09 in post-market trading. The company stock was reiterated with an “equal weight” rating at Barclays Capital earlier this week.

Losers

Jacobs Engineering Group Inc. (JEC) shares tumbled 8.63 percent to $38.13 in post-market trading. The stock has a 52-week low of $33.61, a 52-week high of $48.17 and $5.43 billion in market capitalization.

Veolia Environnement Ve SA (VE) shares slumped 6.59 percent to $11.05 in post-market trading. The stock has a 52-week low of $9.37, a 52-week high of $17.17 and $6.01 billion in market capitalization.

Tetra Technologies Inc. (TTI) shares plunged 2.97 percent to $7.18 in post-market trading. The stock has a 52-week low of $5.35, a 52-week high of $10.66 and $577.81 million in market capitalization.

D.R. Horton Inc. (DHI) shares declined 2.23 percent to $18.81 in post-market trading. The stock has a 52-week low of $12.28, a 52-week high of $22.79 and $6.18 billion in market capitalization.

LifeLock Inc. (LOCK) shares fell 2 percent to $7.84 in post-market trading. The stock has a 52-week low of $6.80, a 52-week high of $9.04 and $691.55 million in market capitalization.