 One of Martínez's most notable negotiations involved the restructuring of the debt of the Mexican chemicals and textile conglomerate Celulosa y Derivados, Sociedad Anónima (CYDSA), a company that had denied him a job when he was younger.CYDSA agreed to an exchange of debt for equity that would hand control of the company to creditors.Fintech bought US$400 million of CYDSA debt for US$40 million and thereby obtained 60% of the shares, taking control of the company from its founders, the Gonzalez Sada family.