Is Mianyang Nanshan Experimental Middle School public or private?

According to official website's inquiry, Mianyang Nanshan Middle School Experimental School is a high-standard, boarding and new mechanism high-quality high school directly under the city, which was invested and built by Mianyang Education Investment Development Group Co., Ltd., a wholly state-owned company. The school adheres to the fine tradition of Mianyang Nanshan Middle School, a century-old prestigious school, and takes "let students learn to take responsibility and lay the foundation for students' lifelong happiness" as its school philosophy. Since its establishment ten years ago, the school has been constantly innovating and developing, and won the A2 Group School Special Prize for Comprehensive Evaluation of Teaching Quality of Mianyang Ordinary Senior High School for nine consecutive years. Mianyang Nanshan Middle School Experimental School, under the leadership of Mianyang Education Investment Co., Ltd., continues to rely on the core school-running concept of "let students learn to take responsibility and lay the foundation for students' lifelong happiness", unswervingly promotes quality education, takes students' success, teachers' achievements and teachers' happiness as the fundamental starting point, constantly innovates and develops, and implements the main responsibility, forming two school-running highlights and five school-running characteristics.