Guidant (GDT

) says it will end its current $3 billion pact to buy Cook Inc. as studies of the "deliver" trial comparing a paclitaxel-coated coronary stent with bare metal stent failed to meet a primary endpoint. (1/3)

A management group led by Chairman Douglas Miller raises takeover bid for Exco Resources (EXCO

) to $18 per share from $17. (12/30)

Environmental Elements (EEC

) hires Legg Mason to help the company evaluate its strategic alternatives, including a sale or merger or other business combination involving the company. (12/27)

Aegis Realty (AER

) agrees to merge with unit of Phillips Edison, Ltd. in a $170.2 million deal. (12/24)

MTR Gaming Group (MNTG

) agrees to buy Sciotto Downs (SCDO

) for $32 per share. (12/24)