Exhibit 99.1

GERDAU S.A.

Condensed consolidated interim financial statements

as of March 31, 2021

GERDAU S.A.

CONSOLIDATED BALANCE SHEETS

In thousands of Brazilian reais (R$)

(Unaudited)

The accompanying notes are an integral part of these Condensed Consolidated Interim Financial Statements

GERDAU S.A.

CONSOLIDATED BALANCE SHEETS

In thousands of Brazilian reais (R$)

(Unaudited)    

The accompanying notes are an integral part of these Condensed Consolidated Interim Financial Statements

GERDAU S.A.

CONSOLIDATED STATEMENTS OF INCOME

In thousands of Brazilian reais (R$)    

(Unaudited)    

The accompanying notes are an integral part of these Condensed Consolidated Interim Financial Statements    

GERDAU S.A.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

In thousands of Brazilian reais (R$)

(Unaudited)  

The accompanying notes are an integral part of these Condensed Consolidated Interim Financial Statements    

GERDAU S.A.

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

in thousands of Brazilian reais (R$)

(Unaudited)    

The accompanying notes are an integral part of these Condensed Consolidated Interim Financial Statements                                

GERDAU S.A.

CONSOLIDATED STATEMENTS OF CASH FLOWS

In thousands of Brazilian reais (R$)

(Unaudited)

The accompanying notes are an integral part of these Condensed Consolidated Interim Financial Statements    

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

NOTE 1 - GENERAL INFORMATION

Gerdau S.A. is a publicly traded corporation (sociedade anônima) with its corporate domicile in the city of São Paulo, Brazil. Gerdau S.A and subsidiaries (collectively referred to as the “Company”) is a leading producer of long steel in the Americas and one of the largest suppliers of special steel in the world. In Brazil, the Company also produces flat steel and iron ore, activities which expanded the product mix and made its operations even more competitive. The Company believes it is the largest recycler in Latin America and around the world it transforms each year millions of tons of scrap into steel, reinforcing its commitment to sustainable development of the regions where it operates. Gerdau is listed on the São Paulo, New York and Madrid stock exchanges.

The Condensed Consolidated Interim Financial Statements of the Company were approved by the Management on May 4, 2021.

NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING PRACTICES

2.1 - Basis of Presentation

The Company's Condensed Consolidated Interim Financial Statements for the three-month period ended on March 31, 2021 have been prepared in accordance with International Accounting Standard (IAS) Nº 34, which establishes the content of condensed interim financial statements. These Condensed Consolidated Interim Financial Statements should be read in conjunction with the Consolidated Financial Statements of Gerdau S.A., as of December 31, 2020, which were prepared in accordance with International Financial Reporting Standards (IFRS) as issued by the International Accounting Standards Board - IASB.

The preparation of the Condensed Consolidated Interim Financial Statements in accordance with IAS 34 requires Management to make accounting estimates. The Condensed Consolidated Interim Financial Statements have been prepared using the historical cost as its basis, except for the valuation of certain financial instruments, which are measured at fair value.

The accounting policies applied in this Condensed Consolidated Interim Financial Statements are the same as those applied in the Consolidated Financial Statements for the year ended December 31, 2020.

2.2 – New IFRS and Interpretations of the IFRIC (International Financial Reporting Interpretations Committee)

The issued and/or reviewed IFRS standards made by the IASB that are effective for the year started in 2021 had no impact on the Company's Financial Statements. In addition, the IASB issued/reviewed some IFRS standards, which have mandatory adoption for the year 2022 and/or after, and the Company is assessing the adoption impact of these standards in its Consolidated Financial Statements.

- Amendment to IAS 1 - Classification of liabilities as Current or Non-current. It clarifies aspects to be considered for the classification of liabilities as Current Liabilities or Non-current Liabilities. This amendment to the standard is effective for fiscal years beginning on/or after January 1, 2023. The Company does not expect material impacts on its Financial Statements.

- Annual improvements in IFRS 2018-2020 standards. It changes the IFRS 1, addressing aspects of first-time adoption in a subsidiary; IFRS 9, addressing the 10% test criterion for reversing financial liabilities; IFRS 16, covering illustrative examples of leasing and IAS 41, covering aspects of measurement at fair value. These changes are effective for fiscal years beginning on/or after January 1, 2022. The Company does not expect material impacts on its Financial Statements.

- Amendment to IAS 16 - Property, plant and equipment: Result generated before reaching the expected conditions of use. It clarifies aspects to be considered for the classification of items produced before the asset is in the projected conditions of use. This amendment to the standard is effective for fiscal years beginning on/or after January 1, 2022. The Company does not expect material impacts on its Financial Statements.

- Amendment to IAS 37 - Onerous contract: Cost of fulfilling a contract. It clarifies aspects to be considered for the classification of costs related to the fulfillment of an onerous contract. This amendment to the standard is effective for fiscal years beginning on/or after January 1, 2022. The Company does not expect material impacts on its Financial Statements.

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

- Amendment to IFRS 3 - References to conceptual framework. It clarifies conceptual alignments of this standard with the IFRS conceptual framework. This amendment to the standard is effective for fiscal years beginning on/or after January 1, 2022. The Company does not expect material impacts on its Financial Statements.

- Amendment to IAS 1 and IFRS Practice Statement 2 – Disclosure of Accounting Policies. It clarifies aspects to be considered in the disclosure of accounting policies. This amendment to the standard is effective for fiscal years beginning on/or after January 1, 2023. The Company does not expect material impacts on its Financial Statements.

- Amendment to IAS 8 – Definition of Accounting Estimates. It clarifies aspects to be considered in the definition of accounting estimates. This amendment to the standard is effective for fiscal years beginning on/or after January 1, 2023. The Company does not expect material impacts on its Financial Statements.

- Amendment to IFRS 16 - Leases. It clarifies aspects to be considered in rent concessions that have a direct relation with Covid-19 pandemic. This amendment to the standard is effective for fiscal years beginning on/or after April 1, 2021. The Company does not expect material impacts on its Financial Statements.

2.3 - Risk of disease outbreaks and health epidemics: Covid-19

The Covid-19 pandemic continues to impact global economic activity and represents the risk that the Company, employees, service providers, suppliers, customers and other business partners may be prevented from carrying out certain business activities for an indefinite period, including due to stoppages that may be requested or mandated by government officials or elected by companies as a preventive measure.

The Company is following all the Covid-19 pandemic prevention guidelines issued by the competent health agencies in the countries in which it operates. In this regard, the Company adopted a series of measures to mitigate the risk of transmission in the workplace, such as the recommendation of the home office, the creation of crisis committees and the cancellation of national and international trips and participation in external events. The Company also reinforces that the health and safety of people are non-negotiable values. The Company has been daily monitoring the evolution of the pandemic scenario and the impacts that this situation has on the routines of employees, their families and, also, for the business.

The nature of our business is complex and, in order to continue operating, much of our work cannot be done remotely. Therefore, our focus is to reduce the risk of the virus spreading through our operations, as operational continuity is essential for jobs, for neighboring communities and for the economies of the countries and regions where we operate. Our plants and offices, therefore, have contingency plans to deal with the ongoing impact of the pandemic, which will continue to be reviewed as the situation evolves.

The risks arising from outbreaks of diseases and epidemics, notably those arising from the Covid-19 pandemic, can contribute significantly to the deterioration of economic conditions in Brazil and globally and could, among other consequences, (i) negatively impact even more the global demand for steel or even lower market prices for products, which can result in a continuous reduction in the Company's sales, operating income and cash flows; (ii) make it more difficult or costly to obtain financing for operations or refinance debt in the future; (iii) impair the financial condition of some of the customers and suppliers; and (iv) reduce investment programs. The Company constantly monitors the risks of commodity prices, interest rates and exchange rates, credit risk management and capital management (note 14.c).

The Company believes that it has no evidence of any risk of operational continuity. However, changes that deteriorate the economic and business environment, or significant changes in the economy or financial market that result in increased risk perception or reduced liquidity and refinancing capacity, if manifested in a greater intensity than anticipated in the scenarios. contemplated by Management, may lead the Company to review its projections and, eventually, may affect the Company's ability to meet its obligations and / or lead to the recognition of losses due to the non-recoverability of its assets.

NOTE 3 – CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

3.1 - Subsidiaries

The Company did not have material changes of interest in subsidiaries for the period ended on March 31, 2021, when compared to those existing on December 31, 2020.

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

3.2 - Joint Ventures

The Company did not have material changes of interest in joint ventures for the period ended on March 31, 2021, when compared to those existing on December 31, 2020.

3.3 – Associate companies

The Company did not have material changes in interest in associate companies for the period ended on March 31, 2021, when compared to those existing on December 31, 2020.

NOTE 4 – CASH AND CASH EQUIVALENTS, AND SHORT-TERM INVESTMENTS

Cash and cash equivalents

Immediately available investments include investments with maturity up to 90 days, immediate liquidity and low risk of fair value variation.

Short-term investments

Short-term investments include Bank Deposit Certificates and marketable securities, which are stated at their fair value. Income generated by these investments is recorded as financial income.

NOTE 5 – ACCOUNTS RECEIVABLE

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated 

(Unaudited)

Accounts receivable by aging are as follows:

NOTE 6 - INVENTORIES

The allowance for adjustment to net realizable value of inventories, on which the provision and reversal of provision are registered with impact on cost of sales, is as follows:

NOTE 7 – INCOME AND SOCIAL CONTRIBUTION TAXES

In Brazil, income taxes include federal income tax (IR) and social contribution (CS), which represents an additional federal income tax. The statutory rates for income tax and social contribution are 25% and 9%, respectively, and are applicable for the periods ended on March 31, 2021 and 2020. The foreign subsidiaries of the Company are subject to taxation at rates ranging between 23.0% and 34.0%. The differences between the Brazilian tax rates and the rates of other countries are presented under “Difference in tax rates in foreign companies” in the reconciliation of income tax and social contribution below.

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

a) Reconciliations of income and social contribution taxes at statutory rates to amounts presented in the Statement of Income are as follows:

(*) Brazilian Law 9,249/95 provides that a company may, at its sole discretion, consider dividends distributions to shareholders to be considered as interest on own capital — subject to specific limitations - which has the effect of a taxable deduction in the determination of income tax and social contribution. The limitation is the greater of (i) shareholders’ equity multiplied by the TJLP (Long Term Interest Rate) rate or (ii) 50% of the net income in the fiscal year. This expense is not recognized for the purpose of preparing the financial statements and therefore does not impact net income.

b) Tax Assets not booked:

Due to the lack of expectation to use tax losses, negative social contribution base and deferred exchange variation arising from some operations in Brazil, the Company did not recognize a portion of tax assets of R$ 1,067,654 (R$ 764,845 on December 31, 2020), which do not have an expiration date. The subsidiaries abroad had R$ 1,302,380 (R$ 1,180,067 as of December 31, 2020) of tax credits on capital losses for which deferred tax assets have not been booked and which expire between 2024 and 2035 and also several tax losses of state credits in the amount of R$ 1,710,449 (R$ 1,623,459 as of December 31, 2020), which expire at various dates between 2021 and 2040.

NOTE 8 – INVESTMENTS

NOTE 9 – PROPERTY, PLANT AND EQUIPMENT

a) Summary of changes in property, plant and equipment – during the three-month period ended on March 31, 2021, acquisitions amounted to R$ 435,129 (R$ 471,588 as of March 31, 2020), and disposals amounted to R$ 324 (R$ 3,285 as of March 31, 2020).

b) Capitalized borrowing costs – borrowing costs capitalized during the three-month period ended on March 31, 2021 amounted to R$ 7,706 (R$ 7,592 as of March 31, 2020).

c) Guarantees – no property, plant and equipment were pledged as collateral for loans and financing on March 31, 2021 and December 31, 2020.

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

NOTE 10 – GOODWILL

The changes in goodwill are as follows:

The amounts of goodwill by segment are as follows:

NOTE 11 – TRADE ACCOUNTS PAYABLE

The Company has contracts with financial institutions in order to allow its suppliers to receive in advance their receivables through an operation called "Trade accounts payable - debtor risk". In this operation, the suppliers transfer the right to receive their receivables to a financial institution, which in turn, becomes the holder of the rights to the suppliers' receivables. The Company constantly monitors the composition of the portfolio and the conditions established with its suppliers, which have not resulted in significant changes in relation to what had been practiced historically.

NOTE 12 – LOANS AND FINANCING

Loans and financing are as follows:

^{(*) Weighted average effective interest costs on March 31, 2021, which in a consolidated basis represents 5.23%}          

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

Loans and financing, denominated in Reais, are substantially adjusted at a fixed rate or indexed to the CDI (Interbank Deposit Certificates).

Summary of loans and financing by currency:

The amortization schedules of long-term loans and financing are as follows:

(*) For the period as of March 31, 2021, the amounts represents payments from April 1, 2022 to December 31, 2022.                

a) Credit Lines

In October 2019, the Company completed the renewal of the Global Credit Line in the total amount of US$ 800 million (equivalent to R$ 4,558 million as of March 31, 2021). The transaction aims to provide liquidity to subsidiaries in North America and Latin America, including Brazil. The companies Gerdau S.A., Gerdau Açominas S.A. and Gerdau Aços Longos S.A. provide guarantee for this transaction, which matures in October 2024. As of March 31, 2021, the outstanding balance of this credit facility was US$ 60 million (equivalent to R$ 341.8 million as of March 31, 2021).

NOTE 13 – DEBENTURES

Maturities of long-term amounts are as follows:

The debentures are denominated in Brazilian Reais, are nonconvertible, and pay variable interest as a percentage of the CDI – Interbank Deposit Certificate.

The average notional interest rate was 0.52% and 1.07% for the three-month period ended on March 31, 2021 and March 31, 2020, respectively.

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

NOTE 14 - FINANCIAL INSTRUMENTS

a) General considerations - Gerdau S.A. and its subsidiaries enter into transactions with financial instruments whose risks are managed by means of strategies and exposure limit controls. All financial instruments are recorded in the accounting books and presented as short-term investments, loans and financing, debentures, related-party transactions, unrealized gains on derivatives, unrealized losses on derivatives, obligations with FIDC, other current assets, other non-current assets, other current liabilities and other non-current liabilities.

The Company has derivatives and non-derivative instruments, such as the hedge for some operations under hedge accounting. These operations are intended to protect the Company against exchange rate fluctuations on foreign currency loans and against interest rate fluctuations. These transactions are carried out considering direct active or passive exposures, without leverage.

b) Fair value – the fair value of the aforementioned financial instruments is as follows:

The fair values of Loans and Financing and Debentures are based on market premises, which may take into consideration discounted cash flows using equivalent market rates and credit rating. All other financial instruments, which are recognized in the Consolidated Financial Statements at their carrying amount, are substantially similar to those that would be obtained if they were traded in the market. However, because there is no active market for these instruments, differences could exist if they were settled in advance. The fair value hierarchy of the financial instruments above are presented in Note 14.g.

c) Risk factors that could affect the Company’s and its subsidiaries’ businesses:

Price risk of commodities: this risk is related to the possibility of changes in prices of the products sold by the Company or in prices of raw materials and other inputs used in the productive process. Since the Company operates in a commodity market, net sales and cost of sales may be affected by changes in the international prices of their products or materials. In order to minimize this risk, the Company constantly monitors the price variations in the domestic and international markets.

Interest rate risk: this risk arises from the possibility of losses (or gains) due to fluctuations in interest rates applied to the Company’s financial liabilities or assets and future cash flows and income. The Company evaluates its exposure to these risks: (i) comparing financial assets and liabilities denominated at fixed and floating interest rates and (ii) monitoring the variations of interest rates like Libor and CDI. Accordingly, the Company may enter into interest rate swaps in order to reduce this risk.

Exchange rate risk: this risk is related to the possibility of fluctuations in exchange rates affecting the amounts of financial assets or liabilities or of future cash flows and income. The Company assesses its exposure to the exchange rate by measuring the difference between the amount of its assets and liabilities in foreign currency. The Company understands that the accounts receivables originated from exports, its cash and cash equivalents denominated in foreign currencies and its investments abroad are more than equivalent to its liabilities denominated in foreign currency. Since the management of these exposures occurs at each operation level, if there is a mismatch between assets and liabilities denominated in foreign currency, the Company may employ derivative financial instruments in order to mitigate the effect of exchange rate fluctuations.

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

Credit risk: this risk arises from the possibility of the company not receiving amounts arising from sales to customers or investments made with financial institutions. In order to minimize this risk, the company adopt the procedure of analyzing in details of the financial position of their customers, establishing a credit limit and constantly monitoring their balances. Regarding short-term investments, the Company invests solely in financial institutions with low credit risk, as assessed by rating agencies. In addition, each financial institution has a maximum limit for investment, determined by the Company’s Credit Committee.

Capital management risk: this risk comes from the Company’s choice in adopting a financing structure for its operations. The Company manages its capital structure, which consists of a ratio between the financial debts and its own capital (Equity) based on internal policies and benchmarks. The Key Performance Indicators (KPI) related to the “Capital Structure Management” objective are: WACC (Weighted Average Cost of Capital), Net Debt/EBITDA (Earnings before interest, income tax, depreciation and amortization), Coverage Ratio of Net Financial Expenses (EBITDA/Net Financial Expenses) and Debt/Total Capitalization Ratio. Net Debt is formed by the principal of the debt reduced by cash, cash equivalents and short-term investments (notes 4, 12 and 13). Total Capitalization is formed by the Total Debt (composed of the principal of the debt) and the Equity (Note 18). The Company may change its capital structure, according to economic and financial conditions, in order to optimize its financial leverage and debt management. At the same time, the Company seeks to improve its ROCE (Return on Capital Employed) through the implementation of working capital management and an efficient program of investments in property, plant and equipment. In the long term, the Company seeks to remain within the parameters below, admitting occasional variations in the short term:

These key indicators are used to monitor objectives described above and may not necessarily be used as indicators for other purposes, such as impairment tests.

Liquidity risk: The Company’s management policy of indebtedness and cash on hand is based on using the committed lines and the currently available credit lines with or without a guarantee in export receivables for maintaining adequate levels of short, medium, and long-term liquidity. The maturity of long-term loans and financing, and debentures are presented in Notes 12 and 13, respectively.

Sensitivity analysis:

The Company performed a sensitivity analysis, which can be summarized as follows:

Foreign currency sensitivity analysis: As of March 31, 2021, the Company is mainly exposed to variations between the Real and the Dollar. The sensitivity analysis carried out by the Company considers the effects of a 5% increase or reduction between the Real and the Dollar in its non-hedged debt. In this analysis, if the Real appreciates against the Dollar, this would represent a gain of R$ 16,946 (R$ 38,363 as of March 31, 2020, respectively). If the Real depreciates against the Dollar this would represent an expense of the same value. Due to the net investment hedge, the variations are minimized when the exchange variation and income tax accounts are analyzed.

The net amounts of trade accounts receivable and trade accounts payable denominated in foreign currency do not represent any relevant risk in the case of any fluctuation of exchange rates.

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

Interest rate sensitivity analysis: The interest rate sensitivity analysis made by the Company considers the effects of an increase or reduction of 10 basis point (bps) on the average interest rate applicable to the floating part of its debt. The calculated impact, considering this variation in the interest rate totals R$ 79,584 as of March 31, 2021 (R$ 84,039 as of March 31, 2020) and would impact the Financial expenses account in the Consolidated Statements of Income. The specific interest rates to which the Company is exposed are related to the loans, financing, and debentures presented in Notes 12 and 13, and are mainly comprised by Libor and CDI — Interbank Deposit Certificate.

Sensitivity analysis of changes in sales price of products and price of raw materials and other inputs used in production: The Company is exposed to changes in the price of its products. This exposure is associated with the fluctuation of the sale price of the Company’s products and the price of raw materials and other inputs used in the production process, mainly for operating in a commodity market. The sensitivity analysis made by the Company considers the effects of an increase or of a reduction of 1% on both prices. The impact measured considering this variation in the price of products sold, considering the revenues and costs for the three-month period ended on March 31, 2021, totals R$ 163,430 (R$ 92,275 as of March 31, 2020) and the variation in the price of raw materials and other inputs totals R$ 94,493 as of March 31, 2021 (R$ 58.540 as of March 31, 2020). The impact in the price of products sold and raw materials would be recorded in the accounts Net Sales and Cost of Sales, respectively, in the Consolidated Statements of Income. The Company does not expect to be more vulnerable to a change in one or more specific product or raw material.

Sensitivity analysis of interest rate swaps: The Company has exposure to interest rate swaps for some of its loans and financing. The sensitivity analysis calculated by the Company considers the effects of either an increase or a decrease of 50 bps in the interest curve for Pre x DI operations. These variations represent an income or expense of R$ 0 (R$ 179 as of March 31, 2020). These effects would be recognized in the Consolidated Income Statement.

d) Financial Instruments per Category

Summary of the financial instruments per category:

GERDAU S.A.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

as of March 31, 2021

(In thousands of Brazilian Reais – R$, unless otherwise stated)

(Unaudited)

On March 31, 2021, the Company has derivative financial instruments such as interest rate and currency swaps. These derivative financial instruments had their losses and/or realized and unrealized gains presented in the account gains (losses) with financial instruments, net in the Consolidated Statement of Income.

e) Operations with derivative financial instruments