Sorry about this but something is wrong. To test it I placed various numbers in a new sheet in column A then in a cell in column B I placed your formula it returned A1 which was not the minimum number.
Yes I thin MIN(A:A) will do but it must be the sheet reference that is causing the problem. I have multiple sheets and the the formula needs to go to a sheet called Nikkei and obtain this value from column M.
=MIN(NIKKEI!M:NIKKEI!M) does not work but the MIN function works OK within the current sheet.