Juan Luis Sillero Algar

AG Siderúrgica Balboa SA converts raw ferrous materials from recycled scrap. Its products include ribbed and smooth round bars. The company was founded in 1992 and is headquartered in Jerez de los Caballeros, Spain.

Refinería Balboa SA provides petroleum refining services. Its installation processes and produces petroleum products like gasoline, kerosene, gas oil, fuel oil, coke-fuel, and sulphur. The company was founded on June 8, 2004 and is headquartered in Jerez de los Caballeros, Spain.

Alfonso Gallardo SA manufactures cold-worked steel tubes, welded cross-sections, open cross-sections and different types of sheets. The firm was founded by Alfonso Gallardo Díaz in 1977 and is headquartered in Jerez de los Caballeros, Spain.

Grupo Industrial Diversificado SL engages in the manufacture and distribution of steel. The firm specializes in the production of cold-formed steel tubes for the construction sector. It also produces welded cross-sections, open cross-sections, and different types of steel sheets. The company was founded by Alfonso Gallardo in 1964 and is headquartered in Jerez de los Caballeros, Spain.