Usinas Siderurgicas de Minas Gerais S A Usiminas : Reference Form

Usiminas Headquarters

6594 Contorno Avenue

(Free Translation: For reference only - Original in Portuguese)

REFERENCE FORM

Base date: 12/31/2020

According to Annex 24 of CVM1 Ruling No. 480, of December 7th, 2009

Usinas Siderúrgicas de Minas Gerais S.A. - USIMINAS

Publicly-traded Company

CNPJ/MF2 No. 60.894.730/0001-05

NIRE3 313.000.1360-0

• 1 Brazilian Securities and Exchange Commission ("CVM")

• 2 Brazilian IRS Registry of Legal Entities

• 3 Number of Enrollment with Commercial Registry 1

Sumário

1. Identification of the parties in charge of the contents of the form ............................................ 4

2. Auditors ............................................................................................................................................ 5

3. Selected financial information ....................................................................................................... 8

4. Risk factors .................................................................................................................................... 15

5. Risk management and internal controls policy ....................................................................... 124

6. History of the issuer .................................................................................................................... 135

7. Activities of the issuer ................................................................................................................ 142

8. Extraordinary business ............................................................................................................. 178

9. Relevant assets ........................................................................................................................... 179

10. Comments of the directors ....................................................................................................... 192

11. Projections ................................................................................................................................. 230

12. Annual shareholders' meeting and management .................................................................. 233

13. Compensation of Managers ..................................................................................................... 317

14. Human Resources ..................................................................................................................... 339

15. Control ........................................................................................................................................ 345

16. Transactions with Related Parties ........................................................................................... 357

17. Capital ......................................................................................................................................... 361

18. Securities ................................................................................................................................... 363

19. Repurchase plans and treasury securities ............................................................................. 387

20. Policy for security trading ........................................................................................................ 388

21. Disclosure policy ....................................................................................................................... 390

REFERENCE FORM

Base date: 12/31/2020

According to Annex 24 of CVM Ruling No. 480, of December 7, 2009

Usinas Siderúrgicas de Minas Gerais S.A. - USIMINAS

Public-traded Company

CNPJ/MF No. 60.894.730/0001-05

NIRE 313.000.1360-0

IdentificationHeadquarter

Usinas Siderúrgicas de Minas Gerais S.A. - Usiminas, a joint stock company registered with the Brazilian IRS Registry of Legal Entities under No. 60.894.730/0001-05, with its acts of incorporation registered with the Registry of Commerce of the State of Minas Gerais under NIRE No. 313.000.1360-0.

6594 Contorno Avenue, Belo Horizonte, State of Minas Gerais.

Investor Officer

Relations Mr. Alberto Akikazu Ono, with principal place of business at the Company's headquarters, in the City Belo Horizonte, State of Minas Gerais. The telephone number of the Investor Relations Department is [phone], the fax number is [phone], and the e-mail [e-mail]

Independent Auditors

PricewaterhouseCoopers

Underwriting Bank

Securities Issued

Bradesco S/A Corretora de Títulos e Valores Mobiliários ("Underwriting agent").

Common and preferred shares, American Depositary Receipts (ADR) / American Depositary Shares (ADS) and debentures.

Newspapers in Which the The information related to the Company is published in the Official Gazette of the Company Discloses its State of Minas Gerais and Estado de Minas.

information

Internet WebsiteService to Shareholders

www.usiminas.com. The information on the Company's website is not an integral part of this

Reference Form and should not be included in it for reference purposes either.

The Company's shareholders are serviced by the Investor Relations Department, which is placed at the Company's headquarters. The Company's telephone and fax numbers and the e-mail are [phone], [phone] [e-mail], respectively.

The shareholders are also serviced by the Shareholders Department of the Underwriting Agent at [phone], [phone] [e-mail], respectively.

1. Identification of the parties in charge of the contents of the form

1.1. Chief Executive Officer and Investor Relations Officer's Declaration

We declare that we have reviewed the Reference Form, that all information presented in this form complies with the provisions set forth in CVM Ruling No. 480, especially Articles 14 to 19, and that the set of information contained in it is a true, accurate, and complete description of the economic and financial standing of Usinas Siderúrgicas de Minas Gerais S.A. - Usiminas, as well as the risks inherent to its activities and the securities it issues.

Sergio Leite de Andrade	Alberto Akikazu Ono
Chief Executive Officer	Chief Financial and Investor Relations
Officer
Classificação da informação: Restrita
Grupo de Acesso: Destinatários deste e-mail

2. Auditors

2.1/2 In relation to the independent auditors

For the fiscal years ended December 31, 2020

CVM (Securities Commission) Code

Name/Corporate name CNPJ

Service start date

Service end date

287-9

PricewaterhouseCoopers Auditores Independentes 61.562.112/0005-54 02/06/2017

Ongoing.

Description contractedofthe

service Full audit of the Financial Statements and limited review of the Quarterly

Information (ITR) of the Company and its subsidiaries (Parent company and Consolidated), prepared in accordance with the accounting practices adopted in Brazil and IFRS.

Review of the calculation basis of the Corporate Income Tax (IRPJ) and the Social Contribution Tax on Net Profit (CSLL), the Contribution on Gross Revenues to the Social Integration Program (PIS), and the Contribution on Gross Revenues for the Social Security Funding (COFINS) of the Company and its subsidiaries.

Total amount of the The independent auditors' compensation in the last fiscal year for Usiminas remuneration of independent companies was R$2,083 thousand, for the auditing service fees.

auditors itemized per service

Justification for replacement

Usiminas companies did not contract other services of their independent auditors not related to the external audit of their financial statements in the last fiscal year.

Not applicable.

Reason submitted by the Not applicable. auditor in case of disagreement of the issuer justification

Technical officer's name

CPF

Service start date Address:

Guilherme Campos e Silva 714.114.966-04 02/06/2017

Rua dos Inconfidentes, 911, 17º e 18º floors, Funcionários, Belo Horizonte, MG, Brasil, CEP 30.140-128, Phone [phone], Fax [phone], e-mail:[e-mail]