Nexa Resources S.A.

Condensed consolidated interim financial statements (Unaudited)

at and for the three and six-month periods ended on June 30, 2025

Contents

Condensed consolidated interim financial statements

Notes to the condensed consolidated interim financial statements

Nexa Resources S.A.   Condensed consolidated interim income statement Unaudited Periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Condensed consolidated interim statement of comprehensive income Unaudited Periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Condensed consolidated interim balance sheet All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Condensed consolidated interim statement of cash flows Unaudited Periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Condensed consolidated interim statement of changes in shareholder's equity Unaudited For the three months ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Condensed consolidated interim statement of changes in shareholder's equity Unaudited For the three months ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A. (“NEXA” or “Parent Company”) is a public limited liability company (société anonyme) incorporated and domiciled in the Grand Duchy of Luxembourg. Its shares are publicly traded on the New York Stock Exchange (“NYSE”).

The Company’s registered office is located at 37A, Avenue J. F. Kennedy in the city of Luxembourg in the Grand Duchy of Luxembourg.

NEXA and its subsidiaries (the “Company”) operate large-scale, mechanized underground and open pit mines, as well as smelters. The Company owns and operates three polymetallic mines in Peru and two polymetallic mines in Brazil. Additionally, the Company owns and operates a zinc smelter in Peru and two zinc smelters in Brazil.

NEXA’s majority shareholder is Votorantim S.A. (“VSA”), which holds 64.68% of its equity. VSA is a Brazilian privately-owned industrial conglomerate that holds ownership interests in metal, steel, cement, and energy companies, among others.

1.1 Main events for the six-month periods ended on June 30, 2025

In January 2025, the Company paid USD 18,300 related to uncertain income tax position of Nexa Resources Peru S.A.A. (“Nexa Peru”) for the year 2018 (for further details see note 8 (c)) and USD 23,992 related to uncertain income tax position of Nexa Resources Cajamarquilla (“Nexa CJM”) for the year 2017. Both payments were made to obtain substantial penalty and interest reductions and the likelihood of loss for both proceedings is considered possible. Such payments do not represent a recognition of the tax debt, and the Company will continue with its legal defense before the applicable instances. These payments were recognized as “judicial deposits and other tax claim payments” under “other assets in the long-term”. If the Company’s legal defense prevails, it may recover the payments in cash or compensate them with other tax obligations.

A provision may be recorded against the amounts paid if the likelihood of loss of said proceedings becomes probable.

NEXA

On May 8, 2025, at the annual shareholders' meeting and in accordance with Luxembourg laws, the Company's shareholders approved a cash distribution to shareholders of USD 13,400 as a share premium reimbursement. The cash distribution was paid on June 27, 2025, to shareholders of record as of June 10, 2025.

Nexa Peru

On March 28, 2025, Nexa Peru approved dividends totaling USD 100,000 payable in two equal installments of USD 50,000 each, based on the ownership percentage of each shareholder as of the payment date. Nexa CJM is entitled to receive USD 82,432 for its shares, NEXA USD 179, and the non-controlling interest USD 17,389. The first installment was paid on April 30, 2025, and the second is scheduled for September 30, 2025.

During the six-month period ended June 30, 2025, Nexa Peru also paid USD 329 related to previous periods in dividends to non-controlling interests.

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Pollarix

On March 31, 2025, Pollarix S.A. (“Pollarix”) approved dividends of USD 3,309 (BRL 19,378) from 2024 earnings, comprising USD 680 (BRL 3,896) to Nexa BR and USD 2,629 (BRL 15,391) to non-controlling interests. On April 10, 2025, USD 4,142 (BRL 23,485) in dividends related to prior periods was paid to non-controlling interests. On June 1, 2025, the Board approved interim dividends of USD 9,050 (BRL 51,307) from the first-quarter 2025 earnings, comprising USD 1,862 (BRL 10,555) to Nexa BR and USD 7,188 (BRL 40,752) to non-controlling interests. Dividends approved during 2025 are expected to be paid by December 31, 2025.

Enercan

On April 30, 2025, Enercan’s Board of Directors approved an additional dividend distribution to its shareholders related to the 2024 fiscal year, entitling the Company’s subsidiary Pollarix to receive USD 18,107 (BRL 102,653). During the three months ended on June 30, 2025, Pollarix received in cash the amount of USD 10,099 (BRL 56,108) from the outstanding balance of the dividend distribution.

In connection with a capital increase approved in November 2024, Nexa Resources El Porvenir S.A.C. (“Nexa El Porvenir”) and non-controlling shareholders completed the subscription of new shares in Nexa Resources Atacocha S.A.A. (“Nexa Atacocha”) between December 2024 and January 2025.

On January 15, 2025, Nexa El Porvenir paid USD 3,453 and non-controlling shareholders paid USD 1,864 for the subscription of newly issued shares of Nexa Atacocha. Since Nexa El Porvenir subscribed to its portion of the capital increase in December 2024, while non-controlling shareholders completed their subscription in January 2025, its ownership interest in Nexa Atacocha decreased from 86.65% as of December 31, 2024, to 82.11%. Nexa El Porvenir recognized a gain of USD 1,005 from the dilution of its ownership interest, due to Atacocha’ s negative equity, which was recorded in equity attributable to Nexa’s controlling interest, while a loss of USD 1,016 was allocated to the non-controlling shareholders.

In January 2025, the subsidiary Nexa Peru acquired 100% of the equity interest in a new subsidiary, Votorantim CSC S.A.C., a provider of shared administrative, tax, and accounting services, from its majority shareholder Votorantim S.A. The acquisition included a net asset value of USD 949, with a purchase price of USD 924, resulting in a gain of USD 25 recognized in profit or loss. The transaction had a net cash effect of positive USD 997, calculated as the difference between the cash and cash equivalents of the acquired subsidiary and the amount paid at the acquisition date.

On April 2, 2025, the US President issued an Executive Order imposing a 10% tariff on imports from most countries and up to 50% on selected nations, under the International Emergency Economic Powers Act (IEEPA). While these measures may increase global trade volatility and affect market prices, no tariffs had been imposed on zinc or copper as of June 30, 2025. The US President launched an investigation into potential tariffs on critical minerals, including zinc and copper, but remains heavily reliant on refined zinc imports (77% of consumption), which lowers the likelihood of significant duties on this metal.

On July 9, 2025 (subsequent event), a 50% tariff was announced on Brazilian exports to the US. This does not directly affect the Company, as it does not export zinc or copper from Brazil. Up to the issuance date of these financial statements, no material impacts related to US tariffs have been identified. The main effect observed has been increased exchange rate volatility, driven by geopolitical tensions and US policy announcements.

For the first half of 2025 and up to the date of this financial statement’s issuance, based on information available as of the date of the issuance of these financial statements, the Company has not identified any material impacts arising from the possible imposition of import tariffs on zinc or copper, both of which remain under review by the US government. The main observed impacts during the period relate to increased exchange rate volatility, influenced by US government statements and ongoing geopolitical conflicts.

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

On April 8, 2025, the Company completed a bond offering amounting to USD 500,000 with a term of 12 years, at an interest rate of 6.60% per year. The proceeds were used to repurchase all the outstanding 2027 and part of the 2028 notes through a combination of a tender offer and a make-whole call, which occurred in April 2025 and May 2025, respectively.

On May 13, 2025, the Company entered into an Export Prepayment Loan (“ACC”) for a principal amount of USD 40,000, at an annual cost of 5.35%. The loan matures in 6 months and is repayable in a single installment upon submission of the supporting documentation.

Further information regarding these operations is disclosed in note 15.

Segment performance is assessed based on Adjusted EBITDA, since net financial results, comprising financial income and expenses and other financial items, and income tax are managed at the corporate level and are not allocated to operating segments.

The Company defines Adjusted EBITDA as follows: net income (loss) for the year/period, adjusted by (i) share in the results of associates, depreciation and amortization, net financial results and income tax; (ii) addition of cash dividends received from associates; (iii) non-cash events and non-cash gains or losses that do not specifically reflect its operational performance for the specific period, such as: gain (loss) on sale of investments; impairment and impairment reversals; gain (loss) on sale of long-lived assets; write-offs of long-lived assets; remeasurement in estimates of asset retirement obligations; and other restoration obligations; and (iv) pre-operating and ramp-up expenses incurred during the commissioning and ramp-up phases of greenfield projects.

In addition, management may adjust the effect of certain types of transactions that in its judgments are (i) events that are non-recurring, unusual or infrequent, and (ii) other specific events that, by their nature and scope, do not reflect NEXA’s operational performance for the year/period.

The adjusted EBITDA is derived from internal information prepared in accordance with the International Financial Reporting Standards (“IFRS Accounting Standards”) and based on accounting measurements and management reclassifications between income statement lines items, which are reconciled to the consolidated financial statements in the column “Adjustments”, as shown in the tables below. These adjustments include reclassifications of certain overhead costs and revenues from “Other income and expenses, net” to “Net Revenues, Cost of sales and/or Selling”, “General and administrative expenses”.

The Company uses customary market terms for intersegment sales. The Company’s corporate headquarters expenses are allocated to the operating segments to the extent they are included in the measures of performance used by the Chief operating decision maker (CODM).

The presentation of segment results and reconciliation to income before income tax in the consolidated income statement is as follows:

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

bookmark

(i) This amount represents the change in the fair value of the offtake agreement described in note 10 (e), which is being measured at Fair value through profit or loss (“FVTPL”). This change in fair value is a non-cash item and has not been considered in the Company’s Adjusted EBITDA calculation.

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

(ii) The fair value adjustment of the energy surplus resulting from electric energy purchase contracts of NEXA’s subsidiary, Pollarix and Nexa Energy Comercializadora de Energia Ltda, as disclosed in note 10 (d). This change in fair value is a non-cash item and has not been considered in the Company’s Adjusted EBITDA calculation.

These condensed consolidated interim financial statements as at and for the three and six-month periods ended on June 30, 2025, have been prepared in accordance with the International Accounting Standard 34 Interim Financial Reporting (“IAS 34”) using the accounting principles consistent with the ® IFRS Accounting Standards, as issued by the International Accounting Standards Board (“IASB”).

The Company made a voluntary election to present, as supplementary information, the condensed consolidated interim statement of cash flows for the three and six-month periods ended on June 30, 2025, and 2024. The Company is also presenting a condensed consolidated interim statement of changes in shareholders’ equity for the three and six-month period ended on June 30, 2025, and 2024 in accordance with SEC Final Rule Release No. 33-10532, Disclosure Update and Simplification.

These condensed consolidated interim financial statements do not include all disclosures required by the IFRS Accounting Standards for annual consolidated financial statements and accordingly, should be read in conjunction with the Company’s audited consolidated financial statements for the year ended on December 31, 2024, prepared in accordance with the IFRS Accounting Standards as issued by the IASB.

These condensed consolidated interim financial statements have been prepared on the basis of, and using the accounting policies, methods of computation and presentation consistent with those applied and disclosed in the Company’s audited consolidated financial statements for the year ended on December 31, 2024.

The Company has not early adopted any new standards, interpretations or amendments that have been issued but are not yet effective.

The preparation of these condensed consolidated interim financial statements in accordance with IAS 34 requires the use of certain critical accounting estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses for the end period. Such estimates and assumptions mainly affect the carrying amounts of the Company’s goodwill, contractual obligations, non-current assets, indefinite-lived intangible assets, inventory, deferred income taxes, and the allowance for doubtful accounts. These critical accounting estimates and assumptions represent approximations that are uncertain and changes in those estimates and assumptions could materially impact on the Company’s condensed consolidated interim financial statements.

The critical judgments, estimates and assumptions in the application of accounting principles during the three and six-month periods ended on June 30, 2025, are the same as those disclosed in the Company’s audited consolidated financial statements for the year ended on December 31, 2024.

These condensed consolidated interim financial statements for the three and six-month periods ended on June 30, 2025, were approved on July 31, 2025, to be issued in accordance with a resolution of the Board of Directors.

During the third quarter of 2024, the Company identified an error in the previously issued consolidated financial statements for the years ended December 31, 2023, and 2022 related to the recognition of contracts containing lease arrangements. The error resulted in the non-recognition of right-of-use assets and lease liabilities, as well as the misstatement of costs and expenses that should have been recognized through the amortization of right-of-use assets and interest expense on lease liabilities, instead of being recorded as costs and operational expenses related to third-party services.

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

The Company revised the comparative information for three and six-month periods ended on June 30, 2024, to reflect the adjustments and the revisions through the recognition of right-of-use assets of USD 54,817 and lease liabilities of USD 62,325 in the Company’s consolidated balance sheet as of January 1^st, 2024, as well as the corresponding impact on the financial statements as of June 30, 2024.

The following tables present the adjustments and the revised figures to the previously issued condensed consolidated interim financial statements.

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Six-month periods ended on June 30 All amounts in thousands of US Dollars, unless otherwise stated