M1

• M1 takes into account only cash in circulation (M0) plus non-interest-bearing bank deposits.
  
  

M5

• In the UK, M5 consists of M1 plus most of the non-checkable bank deposits in the private sector, the deposits of money market instruments and the deposits of building associations.
  
  M5 is the broadest measure of money. Building association deposits distinguish it from the second-broadest feature, M4.
  
  

United States

• In the United States, the M-series is shorter. In the years 1971 -- 1980 there was an M5. But the Federal Reserve decided in 1980 that it would no longer keep statistics for money aggregates other than M1, M2 and M3. The Fed abandoned M3 as well, in 2006.