The different legal forms of private law legal persons have developed side by side. Changes in the way legal persons are used as well as the possibility of derogatory regulation have led to the overlapping of legal person forms. This has also led multiple countries to develop a general regulation of corporate law, which draws heavily on the experience of company law. The paper builds on Josef Bejček’s reflections on commercial law without the Commercial Code and on the interconnection of civil and commercial law perspectives regarding a fundamental part of commercial law. It outlines the arguments in favour of a general regulation of law of legal entities but also its limits, using the example of corporate membership. It seeks to defend the conclusion that neither the possible generalisation of corporate rules into general corporate law nor the possibility of analogous application of the rules of one legal form to another legal form are a threat to company law.