The Paris Stock Exchange rebounded slightly on Wednesday, pending the conclusions of the meeting of the US Federal Reserve. The flagship CAC 40 index advanced by 0.28% or 20.63 points to 7,403.83 points, the day after a sharp decline of 1.45%.Investors expect another moderate increase in the US central bank's (Fed) key interest rate, by a quarter of a percentage point, as in March, while hoping to hear more dovish messages for the coming months.