Benzinga’s Biggest Losers (TTHI, RTK, GY, AIB, FDS)

Transition Therapeutics Inc. (NASDAQ: TTHI) has plunged 44% to $4.43 on 1.80 million shares after Elan Corporation, plc and Transition Therapeutics, Inc. notified clinical investigators of modifications to the Phase II study AD201 and open label extension study AD251 for ELND005, a compound being developed for the potential treatment of Alzheimer`s disease.

Rentech, Inc. (AMEX: RTK) fell 8.57% to $1.50 on 4.43 million shares. Today, Rentech Inc. announced that it has signed a Memorandum of Understanding (MOU) with thirteen domestic and international passenger and cargo carriers that is intended to serve as a framework for a future definitive supply agreement for certified jet fuel from Rentech's proposed synthetic fuels and power facility in Adams County, Mississippi (Natchez Project).

GenCorp Inc. (NYSE: GY) is trading lower by 12.54% to $7.39 on news that GenCorp Inc. plans to sell up to $125 million in convertible subordinated debentures in a private placement to institutional buyers so it can refinance some debt.

Allied Irish Banks, plc. (ADR) (NYSE: AIB) shares are down 9.82% to $3.58. in the past five trading sessions, AIB has fallen over 24%.

FactSet Research Systems Inc. (NYSE: FDS) fell 9.44% to $68.79 on 790K shares after FactSet announced its first-quarter earnings of $36.1 million, or $0.74 a share, as compared to $35.6 million or $0.73 a share from the same quarter last year. Revenue fell to $155.2 million against $155.6 million in the year ago period.