ObjectiveThis study is an attempt to identify crucial assets of intellectual capital (IC) of transnational corporations (TNCs). The author identifies key assets each of the IC layers: organizational, innovative, and institutional. Examining these complex constructions of IC and its comprehensive influence on achieving competitive advantage is justified as the topic has been investigated rarely till now.MethodsThe paper presents literature review and the results of an authorial survey (252 corporations). The author used the following methodology concepts: the Grounded Theory Method, the Social Network Analysis, and the Multidimensional Statistical Analysis.FindingsThe results of the conducted analysis do sustain the postulated hypothesis that the main pillars constituting the intellectual capital of the most powerful transnational corporations (leaders) are the same in terms of the core irrespective of the type of industry. Based on the conducted research, the author points to the three key requirements for each of three IC layers (organizational, innovative, and institutional).Practical implicationThe proposed model of layers of intellectual capital may be used to identify the relationship in question, or its lack of relationship, in other types of international business. Furthermore, the study results provide guidelines for executives of corporations with respect to intellectual capital management.Originality/valueIt is a new, original proposal for measurement and presentation of the relationship between international competitiveness of transnational corporations and their intellectual capital efficiency (pillars of IC-layers).