Amedisys, Arena, BJ’s Wholesale, Dendreon: U.S. Equity Movers

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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.

Home-nursing companies declined after Amedisys Inc. (AMED US) and Almost Family Inc. (AFAM US) said separately they’re being investigated by the U.S. Securities and Exchange Commission.

Amedisys dropped 11 percent, the most since Sept. 3, to $39.34. Almost Family sank 11 percent, the most since February 2009, to $31.05. Gentiva Health Services Inc. (GTIV US) declined 11 percent, the most since February 2009, to $23.93. LHC Group Inc. (LHCG US) lost 12 percent, the most since February 2008, to $24.41.

Arena Pharmaceuticals Inc. (ARNA US) rose 16 percent, the most since June 2009, to $3.56. The company said Eisai Co. (ESALY US), maker of the world’s best-selling Alzheimer’s treatment Aricept, will sell a hunger-curbing pill from Arena in the U.S. if the obesity drug is approved.

AutoNavi Holdings Ltd. (AMAP US) rose 8 percent to $13.50 on the first day of trading. The Beijing-based provider of digital maps and navigation services raised $108 million selling 8.63 million shares at $12.50 each.

Avanir Pharmaceuticals Inc. (AVNR US) jumped 12 percent, the most since June 2009, to $2.87. The drugmaker was rated “buy” in new coverage at Jeffries & Co.

BJ’s Wholesale Club Inc. (BJ US) rose 18 percent, the most since at least 1997, to $43.54. Green Equity Investors V LP said it owns 9.5 percent of the warehouse-club chain, according to a filing with the U.S. Securities and Exchange Commission.

Christopher & Banks Corp. (CBK US) rose 18 percent, the most since Dec. 11, to $7.30. The Minnesota-based women’s clothing retailer reported first-quarter profit excluding some items of 18 cents a share, beating the average analyst estimate by 57 percent, according to Bloomberg data.

Dendreon Corp. (DNDN US) fell 6.8 percent to $30.13, the lowest price since Feb. 10. The U.S. agency supervising Medicare and Medicaid said it would review the effectiveness of the company’s Provenge prostate-cancer treatment.

Harte-Hanks Inc. (HHS US) climbed 7.5 percent, the most since Feb. 3, to $11.23. The publisher of the PennySaver advertising circular was raised to “market perform” from “underperform” at Bank of Montreal.

Hawk Corp. (HWK US) rose 7.7 percent to a record high of $27.40. The maker of products used in brakes and transmissions aid it’s considering possible strategic alternatives, including a sale of the company.

Isle of Capri Casinos Inc. (ISLE US) increased 6.9 percent, the most since June 2, to $9.90. The operator of 14 casinos in six states said it has postponed the proposed public offering of 9 million shares of its common stock, citing recent market conditions.

Pinnacle Airlines Corp. (PNCL US) gained 5.5 percent to $5.74, the highest price since June 7. The Memphis, Tennessee- based holding company bought the regional carrier Mesaba for $62 million from Delta Airlines Inc. (DAL US).

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