I need to format various columns of data so that the highest value in the
column shows as bold (ie; cells A1:A300 - A57 is bold as it has the highest
value).

I am trying to do this in conditional formatting by selecting the range (ie;
A1:A300) so that A1 is the active cell and then:

Formula Is
=MAX(A1:A300)

But all of the cells are shown as highlighted!

What am I doing wrong?

Thanks.