Shares of Michaels Stores ( MIK) were among the NYSE's winners Monday, jumping nearly 13% after the arts and craft retailer said it is exploring strategic options, including a possible company sale. The company hired J.P. Morgan to assist in the process, which could take a number of months, Michaels said. The company also announced the retirement of its chief executive. R. Michael Rouleau, 67, is retiring after a decade at the helm. Rouleau, while stepping down from both his president and CEO posts, will become a special adviser to the board. Jeffrey Boyer and Gregory Sandfort will take over for Rouleau, serving as co-presidents. Boyer previously served as chief financial officer while Sandfort was general merchandise manager. Michaels said Boyer will continue as financial chief. Sandfort, in addition to his role as president, will serve as chief operating officer. The office of CEO will be left vacant by the board, Michaels said. "Jeff Boyer and Greg Sandfort have all the necessary skills -- strategic vision, financial acumen, merchandising savvy and operational expertise -- to lead Michaels Stores into its next phase," the company said. Shares were trading up $4.29 to $38.25. Evergreen Solar ( ESLR) slid 7% after the company backed its prior financial guidance, but said in its annual report that it lost a major silicon supplier. The solar-products maker continues to expect revenue of $10 million to $12 million at its main Marlboro, Mass., operations during the first and second quarters. The company anticipates gross margins of 5% to 10%. For the second half of the year, meanwhile, Evergreen Solar sees gross margins improving to roughly 8% to 15%. The company also continues to project incremental revenue from its EverQ partnership beginning in the second quarter, with $6 million to $12 million during the period. Evergreen Solar anticipates revenue from the partnership of $16 million to $22 million in the third quarter, and $23 million to $25 million for the fourth quarter. Evergreen's shares, however, were hit after its 10-K, filed Friday, said that MEMC ( WFR) broke its contract to supply the company with granular silicon. Evergreen was subsequently downgraded by Thomas Weisel and RBC Capital Markets. Shares were trading down $1.13 to $14.22.