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We present an analysis showcasing how the Advanced X-ray Imaging Satellite(AXIS), a proposed NASA Probe-class mission, will significantly increase ourunderstanding of supermassive black holes undergoing mergers -- from kpc tosub-pc scales. In particular, the AXIS point spread function, field of view,and effective area are expected to result in (1) the detection of hundreds tothousands of new dual AGNs across the redshift range 0 < z < 5 and (2) blindsearches for binary AGNs that are exhibiting merger signatures in their lightcurves and spectra. AXIS will detect some of the highest-redshift dual AGNs todate, over a large range of physical separations. The large sample of AGN pairsdetected by AXIS (over a magnitude more than currently known) will result inthe first X-ray study that quantifies the frequency of dual AGNs as a functionof redshift up to z = 4.

Tracking Supermassive Black Hole Mergers from kpc to sub-pc Scales with AXIS