I don't work for SAP, Porsche or Zeiss. I work for a company that is rather large but rather unknown outside the geographic region it operates locations and outside the industry it operates in, thus it perfectly fits the definition of a hidden champion, but not of a SMB (Mittelstand).

Whenever I tell someone where I work, there is a 80% chance they've never heard of the company, despite there being a high chance they use one or multiple of our products.