Assume lists are in columns A & B:

Highlight column B
Format=Conditional Formatting
FormulaIs: = COUNtIF(A:A,B1)=1
Format=Pattern .. set colour

Matching values will be coloured.

HTH

"srain001" wrote:

Hi,

I have two lists that I'm trying to compare to see if there are any
similarities. The lists are quite extensive. Is there a formula out there
which can match the entries AND highlight them?

any help would be appreciated.
thanx
S.