Shares of Novelis ( NVL) were among the NYSE's winners Friday, surging 23% after the aluminum products company confirmed it is in talks to be acquired. The company said it is currently in discussions with various parties that could lead to a potential sale, though it noted that there's no assurance that a deal will be reached. Shares were trading up $6.87 to $37, on more than 10 times their average daily volume. Shares of NBTY ( NTY) rose 8% after the maker of vitamins and nutritional supplements posted first-quarter results that blew past Wall Street's expectations. For the quarter ended Dec. 31, the company earned $50.9 million, or 73 cents a share, on revenue of $506.2 million. Analysts polled by Thomson First Call expected earnings of 49 cents a share and revenue of $496.8 million. In the year-earlier period, NBTY earned $22.9 million, or 33 cents a share, on revenue of $455.3 million. Shares were trading up $3.75 to $50.49. Caterpillar ( CAT) climbed 2% after the maker of heavy construction equipment posted mixed fourth-quarter results but issued a bullish 2007 outlook. The company reported fourth-quarter earnings of $882 million, or $1.32 a share, on revenue of $11 billion. Analysts expected earnings of $1.34 a share on revenue of $10.5 billion. During the year-earlier period, the company earned $846 million, or $1.20 a share, on revenue of $9.66 billion. Looking ahead, Caterpillar forecast 2007 earnings of $5.20 to $5.70 a share, with revenue of $41.5 billion to $43.6 billion. Analysts project earnings of $5.54 a share and revenue of $41.06 billion. Shares were trading up $1.14 to $60.77.