The top after-market Nasdaq gainers Tuesday were Vitesse Key Tronic Corporation, Alexza Pharmaceuticals Inc, Affymax Inc, Fifth Third Bancorp and Warner Chilcott plc.

The top after-market Nasdaq losers were Ultra Clean Holdings Inc, Dell Inc, Career Education Corporation, Thomas Properties Group and Amkor Technology Inc.

Gainers

Key Tronic Corporation (KTCC) shares climbed 16.50 percent to $9.32 in after-hours trading Tuesday. The company reported fourth quarter net income of $3.8 million or earnings of $0.35 per share, versus earnings of $1.5 million or $0.15 per share in the prior year and said that it expects to report revenue in the range of $94 million to $99 million, and earnings in the range of $0.32 to $0.39 per diluted share for the first quarter of fiscal 2013.

The shares of Alexza Pharmaceuticals Inc (ALXA) rose 10.17 percent in post-market to close at $4.44. The company announced that it has received its EU Certificate of GMP Compliance of a Manufacturer.

Affymax Inc (AFFY) shares advanced 4.47 percent to $14.89 in post-market trading. The company shares have a 52-week trading range of $4.14-$17.88 and 607.66 million in market capitalization.

Fifth Third Bancorp (FITB) shares gained 3.47 percent and reached $8.54 in after-hours trading. The company announced its plan to repurchase up to 100 million shares and said it has increased the quarterly common stock dividend to $0.10 in the third quarter of 2012.   

Warner Chilcott plc (WCRX) shares surged 2.80 percent to $17.24 in after-hours trading. The company shares slipped 2.50 percent in the regular trade after it was downgraded to "underweight" from "equal weight" at Morgan Stanley.

Losers

Ultra Clean Holdings (UCTT) shares slumped 17.01 percent to $5.56 in the post-market trading Tuesday. The company cut its third quarter revenue outlook, citing greater than expected decline in the demand within the semiconductor capital equipment industry. Ultra Clean expects a revenue of $96 million to $101 million in the third quarter, down from its prior forecast of $107 million to $112 million and against market expectations of $109.9 million.

Dell Inc (DELL) shares plunged 4.54 percent to $11.78 inthe post-market trading. The company shares declined after the PC maker reported a second quarter revenue that trailed analysts' estimate and gave a downbeat forecast for the third quarter. The company reported a profit of $732 million on the revenue of $14.5 billion, or 42 cents per share, compared to a $890 million profit on the revenue of $15.6 billion during the corresponding quarter a year ago. The analysts expected the company to post $14.64 billion in revenue.

Career Education Corporation (CECO) shares lost 3.74 percent in after-hours trading to reach $3.60. The company said Michael Graham, its CFO of five years has resigned, and he is replaced by Colleen O' Sullivan, previously the chief accounting officer, effective immediately.

Thomas Properties Group (TPGI) shares dropped 3.47 percent to $5.29 in after-hours trading. The company shares have a 52-week trading range of $1.88-$ 5.71 and 319.51 million in market capitalization.

Amkor Technology Inc (AMKR) shares dropped 2.72 percent to $5.00 in after-market trading. The company shares have a 52-week low of $3.81, a 52-week high of $6.78 and 865.00 million in market capitalization.