While the 2018 directory is not open yet, the 2017 system is still live to attendees and editable by exhibitors.
Please be aware of solicitations requesting voluntary participation to list company information in a "free" business directory. Though these publications mention PMA and Fresh Summit, they are not affiliated with PMA:
If you sign an agreement, you could be locked into a non-terminable contract at a significant cost. We do not charge for our directory listings, and Ascend Media is the only approved vendor for this service.
While many reputable members of the trade press provide Fresh Summit editions, fresh magazine and PMA’s Exhibitor Directory are the only official publications produced by PMA and distributed at Fresh Summit.