How do you keep research participants in a small pool anonymous?

For my project, I try to conduct anonymous user research...but it's with folks whose roles as users are so unique, that they can be easily identified simply from their role/demographic information.

To give a specific example, I do research with all people of a particular job type inside of various branches of our company. There is only one person with that job per branch, and we only test sporadically with each branch. Thus, when I give my team the findings from our research at a branch, it's easy to pinpoint exactly who provided what feedback, even if I don't say their name.

Does anyone know how this should be handled? I want to keep being transparent about the research process with my team in order to maintain trust between us, but if I tell them the results, I can no longer maintain participant anonymity, which I rely on to get more honest feedback from them.