Aeropostale, Jos. A. Bank, Pentair: U.S. Equity Movers

Shares of the following companies are having unusual moves in U.S. trading. Stock symbols are in parentheses, and prices are as of 1:40 p.m. in New York.

Oil-tanker shares gained after Dahlman Rose & Co. said the industry’s asset prices may increase as much as 20 percent within a year as sanctions targeting Iran’s crude exports alter trading patterns and cut a fleet surplus. Frontline Ltd. (FRO) (FRO US) advanced 8.5 percent to $7.62. Overseas Shipholding Group Inc. (OSG) added 6.3 percent to $12.52. Teekay Tankers Ltd. (TNK) climbed 12 percent to $5.90.

Coal producers slipped. U.S. electricity generators are on track to burn 22 percent less coal this year than in 2011, said Lucas Pipes, an analyst at Brean Murray Carret & Co. in New York, citing data published in Coal & Energy Price Report, an industry newsletter.

Alpha Natural Resources Inc. (ANR) fell 4.7 percent to $14.79. Peabody Energy Corp. (BTU) declined 4 percent to $28.65. Arch Coal Inc. (ACI) lost 5.1 percent to $10.69. Walter Energy Inc. (WLT) slumped 5 percent to $57.99.

A123 Systems Inc. (AONE) plunged 16 percent, the most in the Russell 2000 Index, to $1.18. The battery maker may be unable to raise capital and could lose contracts as a result of its recall of defective packs sent to customers, a Deutsche Bank analyst said.

Amylin Pharmaceuticals Inc. (AMLN) surged 46 percent, the most in the Russell 1000 Index, to $22.43. The maker of the diabetes drug Bydureon, rejected a $3.5 billion unsolicited takeover bid from Bristol-Myers Squibb Co. earlier this year, two people with knowledge of the matter said.

Annie’s Inc. (BNNY) (BNNY US) rose 85 percent to $35.12 on the first day of trading. The Berkeley, California-based maker of organic and natural packaged food sold 5 million shares at $19 each, after offering them for $16 to $18 apiece.

Arena Pharmaceuticals Inc. (ARNA) fell 11 percent to $2.89 after sinking as much as 15 percent, the most intraday since Jan. 5. The biotechnology company was cut to neutral from overweight at Piper Jaffray Cos., which cited the share price. The stock had gained 85 percent from March 16 through yesterday.

Christopher & Banks Corp. (CBK) declined 14 percent to $2.04 after slumping 22 percent, the most intraday since March 2009. The Plymouth, Minnesota-based women’s clothing retailer said it had a loss for the nine weeks through Jan. 28, with same store sales falling 14 percent in the period.

Glu Mobile Inc. (GLUU) rose 10 percent to $4.92, the highest intraday price since Aug. 2. The maker of “Contract Killer: Zombies” and “Gun Bros” games for smartphones could be the next takeover target in the $7 billion mobile gaming industry after deals for OMGPOP, Playdom Inc., PopCap Games and Playfish Inc. in the last three years, Canaccord Financial Inc said.

Huntington Ingalls Industries Inc. (HII) (HII US) rose 8.2 percent to $40.99 after reaching $41.55, the highest intraday price since April 1. The U.S. Navy’s sole builder of aircraft carriers reported fourth-quarter profit of $59 million or $1.19 a share, beating the average analyst estimate of 94 cents a share.

Jos. A. Bank Clothiers Inc. (JOSB) declined 8.5 percent to $49.84 and slumped 9.9 percent earlier, the most intraday since June 1. The maker of men’s apparel said its first quarter started “more slowly” than planned, with direct marketing sales down over the first eight weeks. The company reported fourth-quarter sales of $346.3 million, missing the average analyst estimate of $353.5 million.

Medco Health Solutions Inc. (MHS) had the biggest gain in the Standard & Poor’s 500 Index, adding 3.3 percent to $71.27. The pharmacy benefits manager said its $29.1 billion takeover by rival Express Scripts Inc. (ESRX) may be completed as early as next week. Express Scripts increased 1.4 percent to $53.96, after adding 4 percent earlier.

Pentair Inc. (PNR) surged 15 percent to $46.33 after reaching $48.77 earlier, the highest intraday price since at least 1984. The maker of Everpure water filters agreed to combine with the Tyco International Ltd. (TYC) division that makes valves and other flow-control instruments in a deal that values Tyco Flow at $4.53 billion. Tyco increased 3.1 percent to $55.20, the second-most in the S&P 500.

Robbins & Myers Inc. (RBN) advanced 10 percent to $50.52 and jumped 11 percent earlier, the most intraday since Nov. 30. The Dayton, Ohio-based fluids-management company said second- quarter sales were $255.9 million, exceeding the average analyst projection of $238.8 million, data compiled by Bloomberg show.

Sealy Corp. (ZZ) rose 6.4 percent to $2 and rallied 19 percent earlier, the most intraday since June 2009. The mattress maker that is 45 percent owned by private-equity firm KKR & Co. reported first-quarter net sales of $312.3 million, beating the average analyst projection of $301.7 million, data compiled by Bloomberg show.

Synnex Corp. (SNX) slid 14 percent to $37.42, after dropping 16 percent, the most intraday since March 2005. The distributor of computer products said second-quarter adjusted earnings won’t exceed 91 cents a share. Analysts estimate earnings will be 95 cents per share in the period, according to the average in a Bloomberg survey.

Vocera Communications Inc. (VCRA) (VCRA US) rose 39 percent to $22.23 on the first day of trading. The provider of communications equipment for medical facilities sold 5.85 million shares at $16, above the planned range of $12 to $14.

Zoltek Cos. (ZOLT) rose 9.4 percent to $11.15 after rallying 19 percent, the most intraday since Feb. 3. The maker of carbon fibers for windmill blades was raised to hold from underperform at Needham & Co.

To contact the reporter on this story: Whitney Kisling in New York at wkisling@bloomberg.net

To contact the editor responsible for this story: Nick Baker at nbaker7@bloomberg.net

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