Activist Elliott Advisors, the largest individual shareholder in Alliance Trust PLC (ATST.L), is seeking support from fellow investors for a boardroom reshuffle following a phase of unsatisfactory engagement with executives over poor performance. Elliott, which owns 12 percent in the investment trust manager, has nominated three new independent non-executive directors to the board ahead of the company’s annual general meeting in Dundee on April 29, Elliott said in a statement.