Shares of Pentair ( PNR) were among the NYSE's losers Tuesday, tumbling 13% after the pumpmaker posted third-quarter results that fell below forecasts and warned that fourth-quarter earnings would also be below expectations. The company earned $47.4 million, or 46 cents a share, on sales of $716.3 million. Excluding items, the company would have earned 44 cents a share. Analysts polled by Thomson First Call expected earnings of 46 cents a share and sales of $727.8 million. A year earlier, Pentair earned $47.9 million, or 47 cents a share, on sales of $607.8 million. Excluding discontinued operations, the company would have earned 32 cents a share in the year-ago quarter. Looking ahead, Pentair forecast fourth-quarter earnings of 40 cents to 42 cents a share. Analysts had been expecting earnings of 52 cents a share. For 2006, the company expects earnings of $2.20 to $2.30 a share, below analysts' mean estimate of $2.38. Pentair sees sales growth in the mid-single digits. Shares were trading down $4.57 to $31.69. Pactiv ( PTV) rose 17% after the maker specialty packaging products posted third-quarter earnings that topped forecasts. The company reported earnings from continuing operations of $42 million, or 28 cents a share, on sales of $695 million. Analysts were expecting earnings of 22 cents a share on sales of about $700 million. A year earlier, the company earned $49 million, or 32 cents a share, on sales of $652 million. For the fourth quarter, Pactiv forecast earnings of 20 cents to 26 cents a share. Analysts predict earnings of 21 cents a share. Shares were trading up $2.90 to $19.99. Shares of Burlington Northern Santa Fe ( BNI) rose 5% after the railroad operator reported better-than-expected third-quarter results. The company earned $414 million, or $1.09 a share, on sales of $3.32 billion. Analysts expected earnings of $1 a share on sales of $3.2 billion. A year earlier, the company earned $2 million, or 1 cent a share, on sales of $2.79 billion. Last year's results included charges totaling $288 million, or 76 cents a share. "Demand for rail transportation continues to outpace the rest of the economy," the company said. "BNSF continues to operate a fluid rail network and, as a result, we have recorded our fourteenth consecutive quarter of year-over-year volume increases." Shares were up $2.86 to $61.86.