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AIG, BJ’s, Gulf Keystone, Pulse Electronic: U.S. Equity Movers

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.

Producers of rare-earth elements rallied after China cut its export quotas for the minerals used in hybrid cars and magnets. Lynas Corp. (LYSCF US) jumped 16 percent to $2. China Rare Earth Holdings Ltd. (CREQF US) climbed 23 percent to 51 cents. Arafura Resources Ltd. (ARAFF US) increased 16 percent to $1.48.

American International Group Inc. (AIG US) fell 2.8 percent to $57.27 for the biggest drop in the S&P 500. The bailed-out U.S. insurer failed to report $18.7 billion of policyholder guarantees at two property-casualty subsidiaries in 2008, its Pennsylvania regulator said.

BJ’s Wholesale Club Inc. (BJ US) jumped 7.1 percent to $47.62, the second-biggest gain in the Russell 1000 Index. Buyout firm Leonard Green & Partners LP may make a hostile bid for the warehouse store operator if an auction doesn’t happen soon, the New York Post reported, citing people close to the situation.

Ceragon Networks Ltd. (CRNT US) climbed 3.8 percent to $13.08, the highest level since December 2007. The maker of broadband wireless systems was raised to “outperform” from “sector perform” at RBC Capital Markets.

Green Dot Corp. (GDOT US) rose 6.6 percent, the most since July 22, to $53.94. The debit-card issuer’s shares have declined more than warranted since Dec. 6, JPMorgan Chase & Co. analyst Tien-tsin Huang said in a report. The company’s cards already comply with regulations proposed by Senator Robert Menendez, a New Jersey Democrat, on Dec. 17, Huang said.

Gulf Keystone Petroleum Ltd. (GUKYF US) fell 8.5 percent, the most since July 27, to $2.70. The oil and gas exploration company said it will contest claims made by Excalibur Ventures LLC in New York that Excalibur is entitled to as much as a 30 percent interest in blocks in Kurdistan.

MBIA Inc. (MBI US) rose 8.8 percent, the most in the Russell 1000 Index, to $10.36. JPMorgan Chase Bank NA and Barclay’s Bank Plc said they are withdrawing from a lawsuit over the company’s decision to split its insurance unit in two.

Monsanto Co. (MON US) gained 2.7 percent to $68.92, the highest price since April 12. The world’s largest seed company may get a boost in 2011 earnings as prices of glyphosate jumped in China, Piper Jaffray Cos. said in a note.

Noble Energy Inc. (NBL US) advanced 2.6 percent to $87.16, the highest price since July 2008. The oil and natural-gas producer announced in a statement a “significant” natural gas discovery at the Leviathan exploration prospect offshore Israel.

Pulse Electronics Corp. (PULS US) surged 25 percent to $5.45 for the biggest increase in the Russell 2000 Index. The electronics manufacturer received a letter from Bel Fuse Inc., indicating its intent to nominate three candidates for election to the company’s board. Bel Fuse recently expressed interest in “restarting discussions about a potential business combination,” according to the statement.

RightNow Technologies Inc. (RNOW US) increased 19 percent, the most since April 2006, to $23.51. The Web-based customer service provider was raised to “overweight” from “neutral” by Mark Murphy of Piper Jaffray.

Savient Pharmaceuticals Inc. (SVNT US) fell 2.2 percent to $11.51, the lowest since Nov. 16. The East Brunswick, New Jersey-based biotechnology company said in a statement that it initiated a search for a chief executive officer and that Paul Hamelin, the firm’s president since 2008, will continue to lead the company until it hires a new CEO.

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