The empirical research conducted by the authors revealed a number of models for diversifying defense enterprises in Russia. The model characteristic for Rosatom State Corporation has been examined in a precise detail. The main parts of the model include strategy, product, technologies, technology transfer, structural organization, marketing, financing, state regulation. The parts consist of a number of elements configured in various ways depending on the tasks to be done, external conditions, resources, etc. The model takes into consideration three basic targets: raising sustainability of a large holding company’s activity; diversifying activities of the defense enterprises that are part of the state company; performing government functions such as developing high-technology industries, exploring areas of presence, shaping public policy in these directions. The model involves exploiting technologies developed by the enterprises of the state corporation, by traditional defense partners, by external non-defense partners including foreign ones. These technologies provide the basis for creating new civil products with market novelty, high technology, perspective, profitability, and also there must be a possibility to manufacture these products at the enterprises of the state corporation. The peculiar features of the model include arranging diversification at three levels – the corporation level, the division level and the enterprise level; using an integrator – a company which unites and coordinates activities of different enterprises in a certain direction, provides marketing, attracts external partners, deal with customers, etc. Development of the model involves development of innovative facilities in the areas of presence, more active cooperation with non-defense organizations, developing forms of transfer of technologies.