Sunny Friend Environmental Technology Co., Ltd. (8341.TW) engages primarily in waste management services, including the collection, incineration, solidification, physicochemical treatment, and landfill disposal of hazardous business waste, infectious medical waste, general waste, and general business waste; medical waste incineration; installation engineering for waste cleaning equipment and environmental engineering consulting; manufacturing of pollution control equipment; specialized construction for environmental protection engineering; and manufacturing and sales of plastic building materials. The company operates through subsidiaries such as Chin Hsin Environmental Engineering Co., Ltd., Full Giant Resources Ltd., Liang Wei Environmental Engineering Co., Ltd., Cheng Shin Environmental Engineering Co., Ltd., Huan Hsin Precision Co., Ltd., and various Ruentex entities in China focused on environmental sanitation and pollution control services, primarily serving industrial, medical, and business customers in Taiwan and China. Founded in 1994 and headquartered in Yunlin County, Taiwan, the company changed its name from Sunny Friend Waste Disposal Co., Ltd. in May 2001 and listed on the Taiwan Stock Exchange in March 2015. Recent developments include a May 2023 sale of Chin Hsin shares reducing ownership to 66.04% and generating capital surplus; a January 2024 equity purchase in Rizhao Panyue increasing group control to 100%; and a March 2024 approval for Chin Hsin's cash capital increase via 6 million new shares, diluting ownership to 57.42% upon completion in July 2024, alongside ongoing investments in incineration capacity at Changhua plant and heat recovery upgrades at Yunlin facilities.