Most Massive Black Holes Ever Discovered

The 15 most massive black holes ever discovered, ranked by mass in billions of solar masses. Phoenix A leads at ~100 billion solar masses, followed by IC 1101 at ~97.7 billion and TON 618 at 40.7 billion.

Data

#	Black Hole	Mass (Billion M☉)
1	Phoenix A	100
2	IC 1101	97.7
3	4C +74.13	51.3
4	TON 618	40.7
5	NGC 3842	34.6
6	SMSS J2157	34
7	Abell 1201 BCG	32.7
8	H1821+643	30
9	NGC 6166	28.4
10	4C +37.11	28
11	ESO 383-76	27.5
12	Holmberg 15A	21.6
13	NGC 4889	21
14	OJ 287	18.35
15	NGC 1600	17