The top after-market NYSE gainers Tuesday were Vmware, EMC Corp, MGIC Investment, Basic Energy Services and Salesforce.com. The top after-market NYSE losers were Sally Beauty Holdings, United Rentals, Proto Labs, Ultra Petroleum and American Axle & Manufacturing Holdings.

Gainers

Vmware, Inc. (VMW) shares climbed 7.97 percent to $86.69 in post-market trading after raising its fiscal 2012 revenue guidance. The company currently expects fiscal 2012 revenue to be in the range of $4.540 to $4.635 billion, up from its prior estimate of $4.525 to $4.625 billion and against analysts' estimate of $4.59 billion.

EMC Corp. (EMC) surged 6.81 percent to $24.48 in post-market trading after announcing preliminary second-quarter 2012 results. The company announced that the second quarter consolidated revenues rose 10 percent to approximately $5.31 billion and adjusted earnings rose 11 percent to $0.39 per share compared to same period a year earlier.

MGIC Investment Corp. (MTG) shares surged 3.43 percent to $2.41 in post-market trading.

Basic Energy Services, Inc. (BAS) shares surged 3.34 percent to $10.51 in post-market trading. On Monday, the company stock was upgraded to an outperform rating from market perform rating at Howard Weil.

Salesforce.com Inc. (CRM) shares gained 2.93 percent to $130.50 in post-market trading. The stock has a 52-week low of $94.09, a 52-week high of $164.75 and $17.50 billion in market capitalization.

Losers

Sally Beauty Holdings, Inc. (SBH) shares slumped 9.12 percent to $24.62 in post-market trading. The company announced the underwritten public offering of 23,111,527 shares of its common stock held by investment funds associated with Clayton, Dubilier & Rice, LLC pursuant to the Company's shelf registration statement filed with the Securities and Exchange Commission.

United Rentals, Inc. (URI) shares plunged 4.15 percent to $33.00 in post-market trading. The company swung to second quarter net loss of $52 million or $0.63 per share compared to net income of $0.37 per share or $27 million in the same quarter a year-ago. Revenue rose to $993 million from $629 million but fell short of analysts' estimation of $1.08 billion.

Proto Labs, Inc. (PRLB) shares plunged 3.57 percent in post-market trading. The company stock climbed more than 10 percent in regular trading.

Ultra Petroleum Corp. (UPL) shares declined 2.36 percent to $20.71 in post-market trading. The stock has a 52-week low of $17.62, a 52-week high of $47.89 and $3.24 billion in market capitalization.

American Axle & Manufacturing Holdings, Inc. (AXL) shares declined 2.20 percent to $9.80 in post-market trading.