The top after-market NYSE gainers Wednesday were Greenbrier Companies, Yelp Inc, Nuveen Quality Preferred Income, Kraton Performance Polymers and Harmony Gold Mining Co Ltd. The top after-market NYSE losers were Avery Dennison Corp, Globus Medical, Globus Medical, Nu Skin Enterprises and GNC Holdings Inc.

Gainers

Greenbrier Companies Inc. (GBX) shares surged 4.68 percent to $15.79 in post-market trading. The company stock tumbled nearly 9 percent in regular trading.

Yelp Inc. (YELP) shares surged 3.06 percent to $28.95 in post-market trading.  The stock has a 52-week low of $14.10, a 52-week high of $31.96 and $1.72 billion in market capitalization.

Nuveen Quality Preferred Income Fund (JTP) shares rose 2.91 percent to $9.20 in post-market trading.

Kraton Performance Polymers Inc. (KRA) shares advanced 2.78 percent to $22.26 in post-market trading. The company announced Wednesday that it planned to expand hydrogenated styrenic block copolymer (HSBC) manufacturing capability in Asia on a stand-alone basis.

Harmony Gold Mining Co Ltd. (HMY) shares gained 2.53 percent to $8.10 in post-market trading. The company stock plunged more than 5 percent in regular trading on news that employees at the company's Kusasalethu mine near Carletonville have embarked on an unprotected strike.

Losers

Avery Dennison Corp. (GMED) shares plunged 5.09 percent to $29.85 in post-market trading. Avery and 3M Co announced Wednesday that they have terminated the definitive agreement under which 3M would have purchased Avery Dennison’s Office and Consumer Products business.

Globus Medical, Inc. (GMED) shares plunged 4.63 percent to $17.50 in post-market trading. The stock has a 52-week low of $13.06, a 52-week high of $19.93 and $1.66 billion in market capitalization.

Boardwalk Pipeline Partners L.P. (BWP) shares plunged 4.60 percent to $26.75 in post-market trading. The company announced Wednesday that it planned to offer 10,000,000 common units representing limited partner interests in a registered offering.

Nu Skin Enterprises, Inc. (NUS) share fell 2.35 percent to $40.67 in post-market trading. The stock has a 52-week low of $36.20, a 52-week high of $62.01 and $2.49 billion in market capitalization.

GNC Holdings, Inc. (GNC) shares declined 2.14 percent to $38.00 in post-market trading. The company stock was reiterated with a “hold” rating at Deutsche Bank.