There's a gap in black hole masses, and experts believe here is where 'lite intermediate black holes' reside.

Meet 'lite intermediate black holes,' the supermassive black hole's smaller, much more mysterious cousin

Source: space
Source Link: https://www.space.com/astronomy/black-holes/meet-lite-intermediate-black-holes-the-supermassive-black-holes-smaller-much-more-mysterious-cousin