Alcoa ( AA) spiked nearly 5% in after-hours trading Tuesday as the aluminum-products company powered past fourth-quarter Wall Street projections. Excluding restructuring and impairment charges, the Pittsburgh-based company said it earned $644 million, or 74 cents a share -- 179% more than it did a year ago -- on revenue that rose 20% to $7.8 billion. Analysts polled by Thomson Financial were looking for 65 cents a share on revenue of $7.63 billion. The company also posted 2006 income of $2.5 billion, or $2.90 a share, which represents a 75% jump from last year. Shares were gaining $1.36 to $29.88. Synchronoss Technologies ( SNCR) shares got a boost after the Bridgewater, N.J.-based software company announced that wireless giant Cingular will use its ActivationNow platform for order management related to Apple's ( AAPL) new iPhone product. Shares were trading up 75 cents, or 5.1%, to $15.52. Energy company MDU Resources Group ( MDU) rose on news that it's considering selling domestic-power production assets held in its Centennial Energy Resources subsidiary. The Bismarck, N.D.-based company has retained Goldman Sachs as an adviser. Shares were climbing 85 cents, or 3.4%, to $25.75. Electronics maker Audiovox ( VOXX) gained after it swung to a third-quarter profit. The Happauge, N.Y.-based company said it earned $3.9 million, or 17 cents a share, reversing a loss of $10.3 million, or 46 cents a share, a year ago. Analysts were expecting 15 cents a share. Revenue dipped 2.9% to $151.8 million, but that nonetheless beat the $148.8 million consensus. Shares were up 40 cents, or 2.8%, to $14.80.