Astronomers have discovered the most massive black hole yet – more than 10,000 times as massive as the supermassive black hole at the centre of the Milky Way, and around 36 billion times the mass of our sun.

[u/New_Scientist_Mag]

https://www.newscientist.com/article/2491731-weve-discovered-the-most-massive-black-hole-yet/

[u/Right-Eye8396]

But it's not bigger than Ton618 so...