Stellar mass black hole seeds can rapidly grow into intermediate mass black holes (IMBH) in accretion disks around supermassive black holes. Initial seed growth is dominated by collisions with stars and later seed growth is dominated by gas accretion. IMBH grow much faster in this model than in globular cluster. There are strong theoretical and observational analogies with the growth of Jupiters in disks around stars. I discuss the growth and observational signatures of IMBH in AGN disks.