Today, we'll introduce the concept of the P/E ratio for those who are learning about investing. To keep it practical, we'll show how Dermapharm Holding SE's ( ETR:DMP ) P/E ratio could help you assess the value on offer. What is Dermapharm Holding's P/E ratio? Well, based on the last twelve months it is 22.11. That is equivalent to an earnings yield of about 4.5%.