The top after-market NYSE gainers Monday were Calpine Corp, Sprint Nextel, Digital Domain Media Group, EXCO Resources and Teavana Holdings. The top after-market NYSE losers were StanCorp Financial Group, Tempur-pedic International, Swift Energy, HSBC Holdings and Regis Corp.

Gainers:

Calpine Corp. (CPN) shares gained 2.14 percent to $17.64 in post market trading.

Sprint Nextel Corp. (S) shares advanced 2.02 percent to $3.53 in post market trading. The company shares surged nearly 4 percent in regular trading after announcing that it has turned on its 4G Long Term Evolution (LTE) services to 15 cities surrounding the Atlanta, Dallas, Houston, Kansas City and San Antonio markets.

Digital Domain Media Group, Inc. (DDMG) shares advanced 1.86 percent to $4.94 in post market trading. The company stock slumped more than 9.5 percent in regular trading.

EXCO Resources Inc. (XCO) shares rose 1.57 percent to $7.12 in post market trading. The stock has a 52-week low of $5.65, a 52-week high of $16.70 and $1.52 billion in market capitalization.

Teavana Holdings, Inc. (TEA) shares advanced 1.56 percent to $11.99 in post market trading. The company stock plunged more than 5 percent in regular trading.

Losers:

StanCorp Financial Group, Inc. (SFG) shares plunged 4.50 percent to $35.42 in post market trading after announcing preliminary financial results for the second quarter of 2012. StanCorp said its second quarter earnings were negatively affected by comparatively less favorable claims experience in the group long term disability insurance business.

Tempur-pedic International Inc. (TPX) shares fell 2.65 percent to $24.65 in post market trading. The stock has a 52-week low of $20.70, a 52-week high of $87.43 and $1.61 billion in market capitalization.

Swift Energy Co. (SFY) shares declined 2.27 percent to $17.63 in post market trading.

HSBC Holdings plc. (HBC) shares declined 2.25 percent to $42.50 in post market trading. The stock has a 52-week low of $35.72, a 52-week high of $50.30 and $157.94 billion in market capitalization.

Regis Corp. (RGS) shares declined 1.85 percent to $17.48 in post market trading.  Aderans Co announced Monday that it has entered into an agreement to purchase all of the outstanding common stock of Hair Club from Regis for $163.5 million.