Affiliated with the family firm Gonzalo Puyat and Sons; operates two works:
Manila Works – opened in 1921. An integrated steel mill with a capacity of 60,000 tons of conversion iron per annum, a Siemens Marin steel shop with a capacity of 50,000 tons per annum and a non-flat rolling mill with a capacity of 60,000 tons per annum. Employs 1,422.
Taguig Works – opened in 1936. An integrated steel mill with a capacity of 300,000 tons of conversion iron per annum, Siemens Martin and electric steel shops with a combined capacity of 400,000 tons of steel per annum, a flat rolling mill with a capacity of 120,000 tons per annum and a non-flat rolling mill with a capacity of 176,000 tons per annum. Employs 4,937.