As part of our evaluation of products, we look to see if the Vendor is a Marketplace Partner. The only listings I have found are from July 2020:
Community Announcement
Blog Announcement
There is also the Partner Directory, but despite having a filter for Marketplace Partner, it appears to be Solutions Partner identification only.
What is the recommendation for understanding if a Vendor is a Marketplace Partner? If they are missing things like the Security Self-Assessment, or participation in the Bug Bounty program, would these prevent them from getting this standing?