Stoa School, which offered a six-month MBA programme, has shut down after four years, the company's Co-founders Aditya Kulkarni and Raj Kunkolienkar announced on Tuesday. The edtech startup was backed by multiple entrepreneurs like Zerodha's billionaire CEO Nithin Kamath, CRED Founder Kunal Shah and Udemy Co-founder Gagan Biyani, etc. "This was a gut-wrench tough call to take," Kunkolienkar said.