NEW YORK (TheStreet) -- AK Steel Holding (AKS - Get Report), Cloud Peak Energy (CLD) and Steel Dynamics (STLD - Get Report) gained last week, while Agnico-Eagle Mines (AEM) and Silver Standard Resources (SSRI) were among the losers.AK Steel Holding emerged the top gainer last week, jumping 7.0% after it was upgraded to neutral from sell at Goldman Sachs. Cloud Peak Energy rose 6.3%. During the week, the company announced production data for its Cordero Rojo mine for the third quarter of 2011 of approximately 9.9 million short tons. Steel Dynamics grew 5.2% after it recorded an increase of 25% in its third-quarter net sales to $2 billion from $1.6 billion in the year-ago quarter. Meanwhile, net income increased to $43 million, or 19 cents per diluted share, from $19 million, or 9 cents per diluted share, in the same quarter a year before. Steel shipments were up 12% for the quarter.