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We present some results of the deepest extragalactic survey performed by theINTEGRAL satellite. The fraction of very absorbed AGN is quite large. The sharpdecrease in the absorption fraction with X-ray luminosity observed atlower-energy X-rays is not observed. The current lack of truly Compton-thickobjects, with an upper limit of 14% to the size of this population, is justcompatible with recent modeling of the cosmic X-ray background.  We also study the prospects for a future hard X-ray serendipitous survey withSimbol-X. We show that Simbol-X will easily detect a large number ofserendipitous AGN, allowing us to study the evolution of AGN up to redshiftsabout 2, opening the door to the cosmological study of hard X-ray selected AGN,which is barely possible with existing satellites like Swift and INTEGRAL.

Extragalactic Hard X-ray Surveys: From INTEGRAL to Simbol-X