The top after-market NYSE gainers Monday were Thor Industries, Teradata Corp, Valspar Corp, Renren and Commercial Metals Co. The top after-market NYSE losers were Genco Shipping & Trading, Pep Boys-Manny, Moe & Jack, General Growth Properties, NACCO Industries and New Mountain Finance Corp.

Gainers

Thor Industries Inc. (THO) shares surged 2.72 percent to $37.74 in post-market trading. The company stock plunged more than 2.5 percent in regular trading.

Teradata Corp. (TDC) shares gained 2.53 percent to $60.00 in post-market trading. TheStreet Ratings reiterated a “buy” rating on the shares of Teradata with a ratings score of B last week.

Valspar Corp. (VAL) shares advanced 2.51 percent to $62.78 in post-market trading. The stock has a 52-week low of $34.31, a 52-week high of $63.35 and $5.56 billion in market capitalization.

Renren Inc. (RENN) shares rose 2.49 percent to $3.29 in post-market trading. The company stock was upgraded to a “hold” rating from a “sell” rating with a price target of $3.24 at Deutsche Bank.

Commercial Metals Co. (CMC) shares advanced 2.34 percent to $13.55 in post-market trading. The stock has a 52-week low of $11.30, a 52-week high of $16.48 and $1.54 billion in market capitalization.

Losers

Genco Shipping & Trading Ltd. (GNK) shares tumbled 6.67 percent to $2.52 in post-market trading. The stock has a 52-week low of $2.09, a 52-week high of $10.12 and $118.32 million in market capitalization.

Pep Boys-Manny, Moe & Jack (PBY) shares plunged 5.62 percent to $10.08 in post-market trading. The company swung to the third quarter net loss of $6.8 million or $0.13 per share compared to the net income of $7.0 million or $0.13 per share in the same period last year.

General Growth Properties Inc. (GGP) shares plunged 5.13 percent to $18.51 in post-market trading. The company announced Monday that Executive Vice President of Capital Markets Hugh Zwieg would leave the company at the end of the year.

NACCO Industries Inc. (NC) shares fell 3.92 percent to $48.83 in post-market trading. The stock has a 52-week low of $41.04, a 52-week high of $129.20 and $426.60 million in market capitalization.

New Mountain Finance Corp. (NMFC) shares fell 3.65 percent to $14.51 in post-market trading. The company announced that it had commenced a public offering of 3,000,000 shares of its common stock.