GERDAU S.A.

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Specialized Disclosure Report

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Registration statement / Annual report / Transition report for Foreign Private Issuers

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Certification of approval for listing and registration on a national securities exchange

Registration of Securities on Exchange

Prospectus Supplement for Delayed or Continuous Offering

Free Writing Prospectus

No description available

Prospectus Supplement for Delayed or Continuous Offering

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Registration statement for American depositary receipts, effective on filing

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Registration statement for American depositary receipts, effective on filing

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Registration statement for American depositary receipts, effective on filing

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Specialized Disclosure Report

Registration statement / Annual report / Transition report for Foreign Private Issuers

Registration statement / Annual report / Transition report for Foreign Private Issuers

Specialized Disclosure Report

Letter from the SEC

Correspondence with the SEC

Registration statement for American depositary receipts, effective on filing

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Registration statement / Annual report / Transition report for Foreign Private Issuers

Registration statement / Annual report / Transition report for Foreign Private Issuers

Notice of Effectiveness

Registration statement under the Securities Act of 1933 for depositary shares evidenced by American depositary receipts

Registration statement / Annual report / Transition report for Foreign Private Issuers

Registration statement / Annual report / Transition report for Foreign Private Issuers

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement / Annual report / Transition report for Foreign Private Issuers

Prospectus Supplement for Delayed or Continuous Offering

Free Writing Prospectus

Registration statement for American depositary receipts, effective on filing

Prospectus Supplement for Delayed or Continuous Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement / Annual report / Transition report for Foreign Private Issuers (amendment)

Registration statement / Annual report / Transition report for Foreign Private Issuers

Registration statement / Annual report / Transition report for Foreign Private Issuers (amendment)

Registration statement / Annual report / Transition report for Foreign Private Issuers

Post-effective amendment to an American depositary receipts registration statement

Johannpeter Claudio

Lopes Rafael Gamboa

de Franca Gustavo Silva

Wahrhaftig Marcos Eduardo Faraco

Mattiello Marcos Zilles

Mattiello Marcos Zilles

Johannpeter Andre Bier Gerdau

Japur Rafael Dorneles

Da Cunha Gustavo Werneck

Wang Chia Yuan

Metz Mauricio

Wang Chia Yuan

Metz Mauricio

Japur Rafael Dorneles

Peres Cesar Obino da Rosa

Metz Mauricio

Da Cunha Gustavo Werneck

Metz Mauricio

de Franca Gustavo Silva

Wang Chia Yuan