Jamie Dimon wants all of the banks! Looks like JPM really is going to make a bid for WAMU.

Jamie Dimon’s JPMorgan Chase is expected to make a new bid for Washington Mutual, the biggest building society in the US, after its credit rating was cut to junk by Standard & Poor’s.

The Wall Street bank, which bought Bear Stearns earlier this year, is said to be in ‘advanced talks’ over buying the Seattle-based firm.

Dimon is understood to be dealing with the matter personally, and to be in talks with WaMu chief Alan Fishman.