Materials sector shares were leading the advance, with DuPont (DD.N) up 4.3 percent at $68.64 after activist investor Nelson Peltz’s Trian Fund Management, among the biggest shareholders in the company, urged it to separate its high-growth businesses from those with strong cash flows. The broader market focused on the Fed as it concludes a two-day policy meeting. It is expected to provide indications on how soon it may lift interest rates as it prepares for a shift in stance after years of near-zero interest rates.