I have successfully compared the first 10 digits of 2 lists in columns next
to each other to return a true or false answer using this formula in the c
column.

=ISNUMBER(MATCH(LEFT(A2,10)&"*",B$2:B$1201,0))

I need to now take the the number from column A that produced a false in
column c and give me a list of the false answers in a diffenct column.

I would apprecaite any help.

Mike