(Adds background on Marcelo Cunha Ribeiro, prior CFO)
RIO DE JANEIRO, Sept 11 (Reuters) - Cia Siderúrgica Nacional SA, Brazil's third largest flat steelmaker, said on Monday it has named Marcelo Cunha Ribeiro as chief financial officer starting Sept. 12, filling a post that had been vacant for over a year.
As CFO, Cunha Ribeiro will need to address the company's failure to release financial statements for full-year 2016 performance and the first two quarters of 2017.
The post had been empty since former CFO Paulo Rogerio Caffarelli left the steelmaker in May last year to take the helm of state-controlled Banco do Brasil SA.
Cunha Ribeiro worked as Vice President of Finances for Brazilian apparel maker Restoque Comercio e Confecções SA and CFO of Brazilian supermarket chain St. Marche after a long stint at investment firm GP Investments Ltd. (Reporting by Guillermo Parra-Bernal and Alberto Alerigi Junior; Editing by Sandra Maler)