New York City — Shake Shack Inc. and licensee Maxim’s Caterers Limited have expanded their partnership, with plans to open a minimum of 15 Shacks in South China by 2030, including locations in Shenzhen, Guangzhou, Fuzhou and Xiamen. The Shenzhen location is slated to open next year. Together, Shake Shack and Maxim’s Caterers Limited plan to operate 55 Shacks in mainland China by 2030. Maxim’s currently operates Shake Shack locations in Shanghai and Hong Kong, with Beijing and Macau in development with goals to open later in 2020. As a …