OK, so this is less than 1% the size of supermassive black holes:
> Weighing in at about 50,000 times the mass of our Sun, the black hole is smaller than the supermassive black holes (at millions or billions of solar masses) that lie at the cores of large galaxies, but larger than stellar-mass black holes formed by the collapse of a massive star.
And then about this question ...
> Does a supermassive black hole grow from an IMBH?
It'd take at least hundreds of mergers to get even small supermassive black holes. So does that mean that mergers mainly occurred when stuff was closer together?