Nope, there's lots of stocks on SHO that are no longer reporting. Some, just like CMKX, filed to have their registration terminated, some just quit filing.
Some examples on today's list are:
AURC haven't filed since 1998 when they were Black Rock Golf.
CMDI haven't filed since 2001.
CTXI have never filed.
HHDG have never filed as HHDG...been on SHO list for well over 300 days, but hasn't traded for about a year.
IPHN and more.