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.
AMR Corp. (AMR) fell 32 percent to 35 cents for the biggest retreat in the Russell 1000 Index. NYSE Euronext said shares of the parent of American Airlines will be removed from the New York Stock Exchange before trading begins on Jan. 5, following the Fort Worth, Texas-based company’s bankruptcy filing on Nov. 29.
Camac Energy Inc. (CAK) rallied 15 percent, the most since Nov. 2, to $1.01. The oil and gas company agreed to buy three exploration licenses in western Africa and said its partner, an Eni SpA (ENI IM) unit, will sell its 40 percent stake in a Nigerian project to Allied Energy Plc.
Delcath Systems Inc. (DCTH) declined 12 percent, the most in the Russell 2000 Index, to $3.05. The developer of an experimental system for giving anti-cancer drugs said it may sell shares worth as much as $39.8 million through Cowen & Co. LLC. Additional stock may dilute the value of existing shares.
MetroPCS Communications Inc. (PCS) climbed 5.3 percent, the biggest gain on the S&P 500, to $8.68. The pay-as-you-go wireless carrier rose a second day after JPMorgan Chase & Co. said it is a possible takeover target for AT&T Inc. or T-Mobile USA after the larger companies’ $39 billion merger plan collapsed. Leap Wireless International Inc. (LEAP) , also named by JPMorgan as a target, jumped 9.4 percent to $9.29, for a two-day surge of 14 percent.
MoSys Inc. (MOSY) surged 41 percent, the most since February 2004, to $4.20. The company whose designs boost memory- chip capacity and trim power use agreed to sell 73 patents to a Tessera Technologies Inc. (TSRA US) unit for $35 million.
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