Sub MarkSome()Dim i As IntegerDim j As IntegerFor i = 1 To 15000 'B
If CStr(Cells(i, 2).Value) = "" Then Exit For
For j = 1 To 15000 'A
If CStr(Cells(j, 1).Value) = "" Then GoTo nx
If CStr(Cells(i, 2).Value) = CStr(Cells(j, 1).Value) Then
Cells(j, 1).Interior.ColorIndex = 6
End If ...