In early May, Sun disclosed in a filing with the U.S. Securities & Exchange Commission that Sun shareholders had filed three separate lawsuits challenging the proposed sale of the company to Oracle.

The suits, filed in Santa Clara County, California, superior court, name Sun, some of its officials and Oracle as defendants, according to the .

All three actions are aimed at blocking sale, alleging the price tag is "unfair and inadequate." They also allege "claims for breach of fiduciary duty against the individual defendants and for aiding and abetting a breach of fiduciary duty against the corporate defendants," the filing states.