DuPont’s (DD.N) board is open to a negotiated settlement with activist Trian Fund Management in the run-up to the company’s annual shareholder meeting in May, sources close to the matter said on Monday. Despite the stalemate between the chemical conglomerate and the New York-based fund, DuPont’s “doors are not barred for something reasonable,” one of the sources said. On Monday, U.S. proxy advisory firm ISS recommended that DuPont shareholders vote in favor of Trian co-founder Nelson Peltz joining the company’s board, a shot in the arm for the activist investor ahead of voting on May 13.