May 1 (Bloomberg) -- Shares of the following companies had unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 4 p.m. in New York.

Amag Pharmaceuticals Inc. (AMAG US) surged 9.3 percent to $49, the highest price since February 2008. The developer of drugs to treat anemia reported first-quarter sales of $956,000, more than double the average analyst estimate in a Bloomberg survey.

Aon Corp. (AOC US) dropped 14 percent, the most since October 2004, to $36.38. The world’s biggest insurance brokerage said first-quarter profit excluding some items was 76 cents a share, missing the average analyst estimate by 13 percent.

Biomarin Pharmaceutical Inc. (BMRN US) advanced 6.5 percent to $13.69, the highest since March 26. The maker of treatments for rare genetic disorders reported first-quarter earnings excluding some items of 9 cents a share, beating the average analyst estimate, which called for a loss of 4 cents.

Celgene Corp. (CELG US) dropped 7.4 percent, the most since April 1, to $39.54. The maker of the cancer drug Revlimid was cut to “neutral” from “outperform” at Credit Suisse Group AG, which said it will wait for “better visibility” on the treatment’s near-term growth.

Chiquita Brands International Inc. (CQB US) jumped 21 percent, the most since August 2006, to $9.14. The owner of the namesake banana label reported first-quarter earnings excluding some items of 49 cents a share, surpassing the average analyst estimate by 73 percent.

Cott Corp. (COT US) surged 69 percent, the most since at least June 1992, to $3.41. North America’s biggest provider of store-brand soft drinks posted a profit excluding some items of 23 cents a share in the first quarter. Analysts, on average, estimated a loss of 5 cents, according to a Bloomberg survey.

Dean Foods Co. (DF US) lost 8.6 percent, the most since Dec. 1, to $18.93. The biggest U.S. milk processor forecast second-quarter profit excluding some items of at least 38 cents a share. Analysts surveyed by Bloomberg estimated profit of 41 cents. Dean Foods also said it has begun an offering of 22.5 million shares of common stock.

DryShips Inc. (DRYS US) gained 12 percent to $8.28, the highest price since Jan. 29. The commodities shipping line reported first-quarter profit excluding some items of 36 cents a share, topping the average analyst estimate by 81 percent.

Evergreen Solar Inc. (ESLR US) slipped 13 percent, the most since March 20, to $2.11. The maker of solar power wafers reported an adjusted loss of 10 cents a share, missing the average analyst estimate, on lower prices and costs to double production capacity at its plant in Massachusetts.

Expedia Inc. (EXPE US) rose 8.7 percent to $14.79, the highest price since Oct. 1. Bank of America Corp. upgraded the stock to “buy” from “neutral,” saying the online travel agency has “room for material revenue acceleration.”

Flir Systems Inc. (FLIR US) rose 14 percent, the most since Oct. 13, to $25.21. The maker of infrared night-vision cameras and heat-detection products reported profit of 35 cents a share in the first quarter, surpassing the average analyst estimate by 15 percent.

General Cable Corp. (BGC US) climbed 22 percent, the most since Nov. 26, to $33. The biggest U.S. maker of cable for energy and communications companies forecast adjusted profit of at least 70 cents a share in the second quarter. That beat the 69-cent average estimate from analysts in a Bloomberg survey.

General Motors Corp. (GM US) fell the most in the Dow Jones Industrial Average, dropping 5.7 percent to $1.81. The biggest U.S. automaker said it plans to build 390,000 vehicles in North America during the second quarter, down 53 percent from a year ago. The company reported U.S. sales fell 34 percent in April.

Hartford Financial Services Group Inc. (HIG US) retreated 7.9 percent, the most since April 20, to $10.56. The Connecticut-based insurer reported first-quarter adjusted loss of $3.66 a share, missing the average analyst estimate by 17 percent, as the stock-market slump raised the cost of protecting customers from declines in retirement accounts.

Intermec Inc. (IN US) fell 6.9 percent, the most since Feb. 6, to $11.25. The maker of hand-held scanners reported an adjusted first-quarter loss of 8 cents a share and a 25 percent decline in revenue from a year earlier.

Manitowoc Co. (MTW US) rose 9.1 percent to $6.49, the highest price since Jan. 28. The Wisconsin-based manufacturer of cranes said that, excluding some items, it earned 18 cents a share in the first quarter. That topped the average analyst estimate by 32 percent.

MasterCard Inc. (MA US) slipped 5.8 percent, the most since April 20, to $172.90. The world’s second-largest electronic payments network posted an 18 percent profit decline in the first quarter as the strengthening dollar reduced overseas revenue and credit-card spending fell.

McAfee Inc. (MFE US) gained 7.8 percent to $40.46, the highest price since November 2007. The second-biggest maker of security software reported first-quarter profit excluding some items of 57 cents a share, beating the average analyst estimate by 18 percent, after customers renewed subscriptions and added programs that safeguard data.

MetLife Inc. (MET US) declined 7.7 percent, the most since April 20, to $27.45. The biggest U.S. life insurer posted its first quarterly loss since 2001 on writedowns and lower returns from investments. Excluding some items, first-quarter profit was 20 cents a share, missing the average analyst estimate by 40 percent. The company said it is unlikely to meet full-year targets for private equity and hedge fund returns.

Mettler-Toledo International Inc. (MTD US) rose 23 percent, the most since it began trading in November 1997, to $75.61. The maker of weighing instruments posted earnings excluding some items of 95 cents a share in the first quarter, beating the average analyst estimate by 19 percent.

Patriot Coal Corp. (PCX US) rose 22 percent, the most since Dec. 8, to $7.68. The third-largest Eastern U.S. coal company was upgraded to “hold” from “sell” by Citigroup Inc., after posting a profit yesterday.

Other coal producers also gained. Peabody Energy Corp. (BTU US) rallied 9.8 percent to $28.98. Arch Coal Inc. (ACI US) climbed 12 percent to $15.59. Massey Energy Co. (MEE US) jumped 14 percent to $18.07. Consol Energy Inc. (CNX US) added 7.8 percent to $33.62.

PerkinElmer Inc. (PKI US) climbed 20 percent, the most since October 2002, to $17.47. The provider of equipment for genetic screening and drug research reported an adjusted profit of 26 cents a share in the first quarter, exceeding the average analyst estimate by 31 percent.

Reliant Energy Inc. (RRI US) fell 14 percent, the most since March 5, to $4.29. The owner of U.S. power plants that sold its Texas retailing business to NRG Energy Inc. completed a strategic review without selling the whole company.

Research In Motion Ltd. (RIMM US) added 4 percent to $72.30, the highest price since Sept. 25. The maker of the BlackBerry phone was raised to “buy” from “neutral” at UBS AG, which said demand for so-called smartphones will grow among consumers this year and next.

Shaw Group Inc. (SGR US) fell 9.3 percent, the most since March 2, to $30.40. The power plant manufacturer said the opening of a nuclear facility it’s building for Progress Energy Florida will be delayed by at least 20 months. Shaw said it didn’t foresee the change affecting its 2009 financial forecast.

Tree.com Inc. (TREE US) surged 39 percent, the most since it began trading in August, to $8.95. The online mortgage lender reported earnings of 41 cents a share, its first profit as independent company since being broken off from IAC/InterActiveCorp.

Washington Post Co. (WPO US) fell 13 percent, the most since October 1987, to $365.88. The publisher of the namesake newspaper and Newsweek magazine reported a first-quarter loss because of declining advertising sales, costs to cut jobs and falling profit at its Kaplan education unit.

To contact the reporter on this story: Matt Townsend in New York at mtownsend9@bloomberg.net

Last Updated: May 1, 2009 16:48 EDT