CSX (CSX) (ACHN) (ARMH) (AUTH) (CHK) (PFCB) Ratings, Price Targets

CSX Corp. (CSX), Achillion Pharmaceuticals (ACHN), ARM Holdings plc (ARMH), AuthenTec (AUTH), Chesapeake Energy (CHK) and P.F. Chang's China Bistro (PFCB) had ratings and price targets on them adjusted by analysts.

JMP Securities upgraded Achillion Pharmaceuticals (ACHN) to an "Outperform" rating.

Natixis upgraded ARM Holdings plc (ARMH) from a "Reduce" rating to a "Neutral" rating.

Raymond James upgraded AuthenTec (AUTH) from a "Market Perform" rating to an "Outperform" rating.

Stifel Nicolaus upgraded Chesapeake Energy (CHK) from a "Hold" rating to a "Buy" rating. They placed a price target of $29.00 on the company.

Avondale Partners upgraded CSX Corp. (CSX) from a "Market Perform" rating to an "Outperform" rating.

RBC Capital upgraded P.F. Chang's China Bistro (PFCB) from a "Sector Perform" rating to an "Outperform" rating.

Stemcells (STEM) (ACHN) (WETF) (AOLS) (VMI) (BECN) (SNSS) Get New Coverage

Stemcells Inc. (NASDAQ: STEM), Achillion Pharmaceuticals Inc. (NASDAQ: ACHN), WisdomTree Investments, Inc. (NASDAQ: WETF), Aeolus Pharma (OTC:AOLS), Valmont Industries, Inc. (NYSE: VMI), Beacon Roofing Supply (NASDAQ: BECN) and Sunesis Pharmaceuticals, Inc. (NASDAQ: SNSS) getting new analyst coverage.

Roth Capital initiated coverage on Stemcells Inc. (STEM). They placed a “Buy” rating on the company.

Robert W. Baird initiated coverage on Achillion Pharmaceuticals Inc. They placed an “Outperform” rating and a price target of $9.00 on the company.

Piper Jaffray (NYSE:PJC) initiated coverage on WisdomTree Investments, Inc. (WETF). They placed an “Overweight” rating on the company.

Ladenburg Thalmann initiated coverage on Aeolus Pharma (OTC:AOLS). They placed a “Buy” rating and a price target of $1.25 on the company.

Keybanc initiated coverage on Valmont Industries, Inc. (VMI). They placed a “Buy” rating and a price target of $110.00 on the company.

Raymond James (NYSE:RJF) initiated coverage on Beacon Roofing Supply (BECN). They placed an “Outperform” rating on the company.

Roth Capital initiated coverage on Sunesis Pharmaceuticals, Inc. (SNSS). They placed a “Buy” rating on the company.

Top NASDAQ Gainers (OXGN) (EONC) (ACHN) (SQNM) (ELON) on May 6

The top NASDAQ gainers - as measured by percentages Friday on the Exchange - include OxiGene, Inc. (NASDAQ:OXGN), eOn Communications Corporation (NASDAQ:EONC), Achillion Pharmaceuticals, Inc. (NASDAQ:ACHN), Sequenom, Inc. (NASDAQ:SQNM) and Echelon Corporation (NASDAQ:ELON).

OxiGene, Inc. (OXGN) led the NASDAQ gainers, closing at $3.56, up $1.21, or 51.53 percent.

eOn Communications Corporation (EONC) ended the day at $2.81, up $0.71, or 33.81 percent.

Achillion Pharmaceuticals, Inc. (ACHN) closed at $5.68, gaining $1.01, or 21.63 percent.

Sequenom, Inc. (NASDAQ:SQNM) closed at $7.75, rising $1.07, or 16.02 percent.

Echelon Corporation (NASDAQ:ELON) closed Friday at $10.16, climbing $1.36, or 15.45 percent.