The core activity of Arundel AG primarily involves investments in real estate and investment banking. Specifically, this includes the ownership and management of real estate in Germany and India, as well as passive investments in companies offering consulting services, particularly in the USA. Furthermore, the company is active in investment banking, particularly through its subsidiary RP&C International Inc., which is based in London and has been involved in investments worth over $8.5 billion in the USA, Europe, and India in the past.