Supermassive black holes that seem too large to exist in the early universe may have grown from primordial black holes formed in the first second after the Big Bang.

Tiny ‘primordial’ black holes created in the Big Bang may have rapidly grown to supermassive sizes

Source: space
Source Link: https://www.space.com/astronomy/black-holes/tiny-primordial-black-holes-created-in-the-big-bang-may-have-rapidly-grown-to-supermassive-sizes