Moideen established the Thumbay Group in 1997. Today it is a diversified business group with operations across multiple sectors, including education, healthcare, medical research, diagnostics, retail pharmacy, health communications, retail optical, and wellness, among others. In July 2024, Moideen unveiled Gulf Medical University’s plans to launch the Thumbay College of Management and AI in Healthcare, offering undergraduate and postgraduate programs across Dubai, Saudi Arabia, London, and Singapore.