I had contact with somebody at JAMF, and they told me they are preparing GDPR compliance, and they don't see any show-stoppers.
They got EU-US recertified and successfully completed a SOC 2 type 2 audit.
This is what I got from our Jamf Buddy:
Hi Mark, How are you? Thank you for elaborating more. I had to check internally to make sure I would be providing you with the right information. Here are the detail we are able to share in this instance and pertains to Jamf: Gap analysis was completed in August. Implementation project is in progress. Jamf re-certified with Privacy Shield on 13/10/17 (and will remain so to compliant under GDPR) You may wish to review Jamf Security information regarding privacy of Jamf Cloud and Jamf on how data is stored/accessed. I can assure you this is definitely under Jamf’s radar, any further updates will be communicated to our customers.