STR Holdings, Inc. is a holding company. The Company is a provider of encapsulants to the solar industry. Encapsulant is a component used to protect solar cells and hold solar modules together. The Company has developed ethylene-vinyl acetate (EVA)-based encapsulants for use in commercial solar module manufacturing. The Company's encapsulant formulations offer a range of properties and processing attributes, including various curing times and temperatures that align with the requirements of its customers' individual lamination processes and module constructions. The Company's formulations can be used in both crystalline silicon and thin-film modules. The Company operates production facilities in Llanera, Asturias, Spain and Shajiabang, Changshu, Jiangsu Province, China. It has a total annual production capacity of approximately 5.1 gigawatts. Its customers are solar module manufacturers located mainly in North America, Europe and Asia.