The top after-market NYSE gainers Tuesday were Unisys Corp, Chesapeake Energy, Dolby Laboratories, Ryland Group and ServiceNow. The top after-market NYSE losers were Cobalt International Energy, Spansion, Royal Caribbean Cruises, Ace Ltd and Celanese Corp.

Gainers

Unisys Corp. (NYSE:UIS) shares rallied 11.42 percent to $21.08 in post-market trading. The company reported the fourth quarter net profit of $81.8 million or $1.67 per share, down from $94.3 million or $1.94 per share in the same period last year but topped the analysts’ estimate of $0.93 per share.

Chesapeake Energy Corp. (NYSE:CHK) shares climbed 9.07 percent to $20.69 in post-market trading. The company announced Tuesday that its co-founder, chief executive officer and president Aubrey K. McClendon would retire April 1, 2013 and continue to serve as chief executive officer until the appointment of his successor.

Dolby Laboratories, Inc. (NYSE:DLB) shares surged 4 percent to $33.02 in post-market trading. Its first quarter net profit declined to $51.3 million or $0.50 per share from $73.2 million or $0.67 per share in the same quarter last year but topped Reuters’ estimate of a net profit of $0.45 per share. Dolby Labs currently expects fiscal 2013 revenue to be in a range of $910 to $950 million compared to the analysts’ estimate of $918.50 million.

Ryland Group Inc. (NYSE:RYL) shares gained 3.36 percent to $42.70 in post-market trading. Its fourth quarter net income surged to $28.57 million or $0.55 per share from $812,000 or $0.02 per share in the same quarter a year earlier.

ServiceNow Inc. (NYSE:NOW) shares rose 3.35 percent to $31.21 in post-market trading. The company stock plunged more than 3 percent in regular trading.

Losers

Cobalt International Energy, Inc. (NYSE:CIE) shares tumbled 9.15 percent to $22.25 in post-market trading. The stock has a 52-week low of $19.54, a 52-week high of $36.51 and $9.96 billion in market capitalization.

Spansion Inc. (NYSE:CODE) shares slumped 8.96 percent to $11.99 in post-market trading. The company swung to the fourth quarter net profit of $6.9 million or $0.11 per share compared to the net loss of $74.4 million or $1.25 per share. The adjusted net profit was $0.34 per share compared to a loss of $0.68 per share last year but missed the analysts’ estimate of $0.36 per share.

Royal Caribbean Cruises Ltd. (NYSE:RCL) shares plunged 5.15 percent to $35.55 in post-market trading. The stock has a 52-week low of $22.12, a 52-week high of $38.56 and $8.17 billion in market capitalization.

Ace Ltd. (NYSE:ACE) shares declined 4.51 percent to $81.11 in post-market trading. Its fourth quarter operating profit declined to $492 million or $1.43 per share from $648 million or $1.90 per share in the same quarter a year earlier. The company expects that the fiscal 2013 operating profit will be in a range of $6.60 to $7.00 per share, below the analysts’ estimate of $7.89 per share.

Celanese Corp. (NYSE:CE) shares declined 3.69 percent to $46.31 in post-market trading. The stock has a 52-week low of $32.77, a 52-week high of $52.59 and $7.67 billion in market capitalization.

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