By Lu Wang

BLOOMBERG NEWS

Shares of the following companies are having unusual moves in U.S. trading this morning.

U.S. Railroad companies advanced after Berkshire Hathaway announced it will buy Burlington Northern Santa Fe Corp. (BNI US) for $100 per share in cash and stock in the company's biggest takeover under Warren Buffett. The shares of the largest U.S. railroad surged 28 percent to $97.63 for the biggest advance in the Standard & Poor's 500 Index.

Other railroad stocks also rallied. CSX Corp. (CSX US) added 6.3 percent to $45.53. Union Pacific Corp. (UNP US) climbed 6.3 percent to $58.50. Norfolk Southern Corp. (NSC US) gained 3.9 percent to $48.46.

U.S. semiconductor stocks were downgraded to "cautious" at Morgan Stanley, which said the industry is "in the final innings of the semi cycle."

Intel Corp. (INTC US) had the steepest decline in the Dow Jones Industrial Average, sliding 2.9 percent to $18.46. Advanced Micro Devices Inc. (AMD US) declined 4.4 percent to $4.40. Micron Technology Inc. (MU US) lost 2.6 percent to 6.41.

The brokerage cut the rating for Novellus Systems Inc. (NVLS US), a maker of semiconductor equipment, to "underweight" from "equal weight" and the stock erased 5.7 percent to $19.59 for the biggest retreat in the S&P 500.

Morgan Stanley also downgraded KLA-Tencor Corp. (KLAC US), which sank 4.4 percent to $31.41, and Xilinx Inc. (XLNX US), which lost 3 percent to

Altra Holdings Inc. (AIMC US) rose 25 percent to $11.21 after climbing as much as 29 percent, the most intraday since November 2008. The maker of power transmission products was upgraded to "outperform" from "neutral" by Robert W. Baird Ltd. after posting an unexpected profit in the third quarter.

Black & Decker Corp. (BDK US) jumped 26 percent to $59.85 for the second-biggest surge in the S&P 500. The maker of power tools including the Dewalt brand agreed to be bought by Stanley Works (SWK US) in an all-stock deal valued at $4.5 billion. Black & Decker holders will get 1.275 Stanley Works shares for each stock they own. Stanley Works added 4.6 percent to $47.23.

Cedar Fair LP (FUN US) fell 16 percent to $8 and tumbled 20 percent earlier, the most intraday since October 2008. The owner of amusement parks including Cedar Point in Ohio posted third- quarter earnings that missed analysts' estimates and said it is likely to suspend its dividend next year.

Cognizant Technology Solutions Corp. (CTSH US) rose 7.2 percent to $41.61 after advancing earlier to $42.40, the highest intraday price since October 2007. The computer-services provider to Aetna Inc. and Kimberly-Clark Corp. said third- quarter profit rose 21 percent as sales increased 5.6 percent more than analysts anticipated. The company also boosted its forecast for 2009 adjusted profit to $1.88 a share, more than the $1.78 average per-share estimate of analysts surveyed by Bloomberg.

Dana Holding Corp. (DAN US) lost 4 percent to $5.57 after dropping earlier to $5.35, the lowest intraday price since Sept. 10. The truck axle and frame maker that exited bankruptcy in 2008 posted a narrower third-quarter loss as it shut factories and customers such as Ford Motor Co. increased production. The loss was 243 percent wider than the average analyst estimate.

Diedrich Coffee Inc. (DDRX US) had the second-biggest gain in Russell 2000 Index, rallying 26 percent to $25.73. Peet's Coffee & Tea Inc. (PEET US) agreed to buy Diedrich for about $213 million, or $26 a share, expanding the coffee-shop chain into single-cup prepackaged coffee.

Ener1 Inc. (HEV US) gained 9 percent to $5.23 and rallied 13 percent earlier, the most intraday since Aug. 5. The maker of electric-car batteries was initiated at "buy" at Deutsche Bank, which said the company has the "potential to become a key player" in the battery market.

Energizer Holdings Inc. (ENR US) dropped 12 percent to $53.12 and slumped 13 percent earlier, the most intraday since Dec. 1. The alkaline battery and consumer product maker reported third quarter profits of 98 cents per share, 16 percent below the average analyst estimate in a Bloomberg survey.

Hecla Mining Corp. (HL US) increased 15 percent to $4.71 and rallied as much as 16 percent, the most intraday since April 27. The silver producer reported adjusted earnings of 9 cents per share. Analysts surveyed by Bloomberg, on average, predicted the company would break even.

Herbalife Ltd. (HLF US) added 6.8 percent to $37 and jumped 8.7 percent earlier, the most intraday since May 5. The seller of nutritional and weight-loss supplements forecast 2010 earnings of at least $3.50 a share, more than the $3.41 average per-share estimate of analysts surveyed by Bloomberg.

Landry's Restaurants Inc. (LNY US) rose the most in Russell 2000 Index, surging 28 percent to $13.80. The owner of the Crab House and Rainforest Café chains said Chairman and Chief Executive Officer Tilman J. Fertitta agreed to buy out the company for $14.75 a share, or $1.2 billion.

Oshkosh Corp. (OSK US) gained 9.9 percent to $34.98 and jumped 11 percent earlier, the most intraday since Aug. 27. The maker of all-terrain blast-proof trucks for the military said that, excluding some items, it earned 27 cents a share in the fiscal fourth quarter. The average estimate of analysts surveyed by Bloomberg was for profit of 19 cents.

SanDisk Corp. (SNDK US) lost 4 percent to $20.02 and declined earlier to $19.61, the lowest intraday price since Sept. 14. The world's largest maker of flash-memory cards used in digital cameras and mobile phones was downgraded to "underperform" from "neutral" at Wedbush Securities.

Technitrol Inc. (TNL US) slumped 16 percent to $6.60 and tumbled 20 percent earlier, the most intraday since Feb. 20. The Trevose, Pennsylvania-based maker of electronic components was downgraded to "neutral" from "buy" at Longbow Research after forecasting fourth-quarter sales that missed analysts' estimates.

Texas Roadhouse Inc. (TXRH US) climbed 14 percent to $10.74 after jumping as much as 21 percent, the most intraday since September 2008. The Louisville, Kentucky-based steakhouse chain reported third-quarter profit of 15 cents a share, topping the average analyst estimate by 23 percent, according to Bloomberg data.

TNS Inc. (TNS US) lost 9.2 percent to $26.25 and dropped as much as 10 percent, the most intraday since March 11. The provider of data communications to credit-card-payment processors cut its annual revenue forecast, saying it expects sales of $478 million at most, less than the $482 million average estimate of analysts surveyed by Bloomberg.