Nexa Resources S.A.

Condensed consolidated interim financial statements (Unaudited)

at and for the three and nine-month periods ended on September 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 September 30 All amounts in thousands of US Dollars, unless otherwise stated

The accompanying notes are an integral part of these condensed consolidated interim financial statements.

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

The accompanying notes are an integral part of these condensed consolidated interim financial statements.

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

The accompanying notes are an integral part of these condensed consolidated interim financial statements.

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

The accompanying notes are an integral part of these condensed consolidated interim financial statements.

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

The accompanying notes are an integral part of these condensed consolidated interim financial statements.

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

The accompanying notes are an integral part of these condensed consolidated interim financial statements.

Nexa Resources S.A.   Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 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 nine-month period ended on September 30, 2025

In January 2025, the Company paid USD 18,300 related to an 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 an 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” included in the “long-term other assets”. 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 of USD 8,717 was paid on April 30, 2025, and the second of USD 8,103 was paid on September 30, 2025.

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

Pollarix

As of September 2025, Pollarix S.A. approved, and paid dividends derived from both prior and current period earnings. For the three-month period ended September 30, 2025, the Company approved interim dividends related to second-quarter earnings totaling USD 12,214 (BRL 66,526), of which USD 2,512 (BRL 13,685) was allocated to Nexa BR and USD 9,702 (BRL 52,841) to non-controlling interests. During the same period, dividends amounting to USD 4,142 (BRL 23,485) were paid.

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

For the nine-month period ended September 30, 2025, total dividends approved amounted to USD 24,573 (BRL 137,211), with USD 5,054 (BRL 28,136) allocated to Nexa BR and USD 19,519 (BRL 108,984) to non-controlling interests. As of September 30, 2025, the Company had paid USD 11,624 (BRL 64,237). An additional USD 6,816 (BRL 37,125) is scheduled for payment by October 31, 2025. The remaining dividends approved for 2025 are expected to be paid between December 2025 and January 31, 2026, subject to cash availability.

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 2025, Pollarix received in cash a total amount of USD 16,160 (BRL 89,773), including USD 10,099 (BRL 56,108) related to the June distribution and USD 6,061 (BRL 33,665) related to August, from the outstanding dividend amount.

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 applied to zinc or copper as of September 30, 2025. The US President launched an investigation into potential tariffs on critical minerals, including zinc and copper, however the US remains heavily dependent on refined zinc imports (77% of consumption), which reduces the likelihood of significant duties on this metal.

On July 9, 2025, a 50% tariff was announced on Brazilian exports to the US, which became effective on August 1, 2025. This measure does not directly affect the Company, as it exports zinc or copper primarily from Peru, which maintained the previously established 10% base tariff and continues to exempt these minerals from additional duties due to their classification as critical minerals.

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

During the nine-month period ended on September 30, 2025, and up to the issuance date of these financial statements, the Company has not identified any material impact related to US trade measures or potential import tariffs on zinc or copper, both of which remain under review by the US government. The main observed impact continues to be exchange rate volatility, influenced by US policy announcements and ongoing geopolitical tensions.

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.

On July 17, 2025, Nexa El Porvenir, which owned 82.11% of Nexa Atacocha, launched a Voluntary Public Tender Offer (OPA) through the Lima Stock Exchange (BVL), under the supervision of the Peruvian Securities Market Authority (SMV), to acquire up to the remaining 17.89% of Atacocha’s shares held by non-controlling interests. The tender offer remained open until September 3, 2025.

Following the completion of Tender Offer, 0.89% of the shares were acquired for USD 502, resulting in an increase in Nexa El Porvenir’s controlling ownership interest in Nexa Atacocha from 82.11% to 83.00%.

As a result, the non-controlling interest decreased from 17.89% to 17.00. Consequently, a total reduction of USD 502 was recorded in equity, of which USD 492 was recognized in retained earnings attributable to the controlling interest and USD 10 to the non-controlling interest.

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.

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

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 Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated

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

(i) This amount corresponds to the change in the fair value of the offtake agreement disclosed in note 10 (e), which is being measured at Fair value through profit or loss (“FVTPL”). As this change in fair value represents a non-cash item, it has been excluded from the Company’s Adjusted EBITDA calculation.

(ii) This amount corresponds to the change in fair value and any adjustment of the energy surplus arising 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 been excluded from the Company’s Adjusted EBITDA calculation.

These condensed consolidated interim financial statements as at and for the three and nine-month periods ended on September 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 nine-month periods ended on September 30, 2025, and 2024. The Company is also presenting a condensed consolidated interim statement of changes in shareholders’ equity for the three and nine-month periods ended on September 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.

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

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 nine-month period ended on September 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 nine-month periods ended on September 30, 2025, were approved on October 30, 2025, to be issued in accordance with a resolution of the Board of Directors.

(i) Gross billing increased in the three-month period ended on September 30, 2025, compared to the same period in 2024 mainly due to higher metal prices and increased sales volume. The increase in the nine-month period ended September 30, 2025, was mainly due to higher zinc and copper metal prices, offset by lower sales volume mainly in mining segment.

Additionally, in September 2025, Nexa recognized a reduction of USD 24,637 (September 30, 2024: USD 21,084) as an annual remeasurement adjustment to its silver stream revenue previously recognized, considering the higher long-term prices and the updated mining plan for its Cerro Lindo Mining Unit. According to the Company’s silver streaming accounting policy, prices fluctuations and changes in the life of mine (“LOM) resulting from updates to mining plans are variable considerations. Therefore, revenue recognized under the streaming agreement should be adjusted to reflect these updated variables.

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

(i) In the nine-month period ended on September 30, 2025, the Company recognized USD 2,888 in cost of sales related to idle capacity in Juiz de Fora, resulting from the temporary shutdown of the emissions control system, and USD 1,403 in El Porvenir S.A.C. due to a temporary reduction in mining capacity caused by restricted access to ore zones. Additionally, as of September 30, 2024, Nexa had recognized idle capacity costs totaling USD 34,591(including USD 9,092 in depreciation) and USD 3,661 in El Porvenir.

(ii) The increase in raw materials and consumables for the three-and nine-month periods ended September 30, 2025, was mainly driven by higher zinc and copper concentrate prices purchased from third parties for use in the Company’s smelting operations. This impact was partially offset by lower sales volumes when compared with the same period in 2024.

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

(i) The amounts for the nine-month period ended September 30, 2025 are mainly related to exchange-rate variations on USD- denominated accounts receivable and payable between Nexa BR with NEXA, as well as on intercompany loans between Nexa BR and its related parties, for which the exchange variation is not eliminated in consolidation, and on foreign-currency denominated loans. These transactions were affected by the volatility of the Brazilian Real (“BRL”), which strengthened against the USD in 2025, after depreciating in 2024.

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

(i) On December 11, 2024, the Luxembourg Parliament approved a reduction in the aggregate corporate income tax rate from 24.94% to 23.87%, effective January 1, 2025. As NEXA’s standalone net operating losses do not meet the recognition criteria, no deferred tax assets were recognized. Therefore, the tax rate reduction has no impact on the consolidated interim income statement.

As of September 30, 2025, the main legal proceedings are related to: (i) the interpretation of the application of the Cerro Lindo's tax stability agreement; (ii) transfer pricing litigation involving related party transactions; and (iii) the deductibility of certain costs and expenses.

The estimated contingent liabilities as of September 30, 2025, totaled USD 374,314, representing a decrease from the USD 430,567 reported as of December 31, 2024, primarily due to final resolutions issued by the Tax Court during the third quarter of 2025 regarding the 2014 and 2015 tax stability and other expenses discussions related to Cerro Lindo.

In these rulings, the Tax Court upheld SUNAT’s restrictive interpretation that the tax stabilization agreement and the reduction in the income tax rate had only been applied if Nexa had income generated from the production of up to 5,000 tons per day. As the Company’s production capacity had expanded over time, SUNAT interpreted that the tax stability agreement did not apply entirely to any production of the years 2014 and 2015. The Company will continue to litigate through the Peruvian Judiciary levels and, according to local regulations, in order to appeal, the Company is required to pay the full disputed amount once the debt becomes enforceable, currently expected in the first quarter of 2026. The full amount of the 2014 and 2015 years proceedings may be paid in up to 72 monthly installments with accrued interest.

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

The Tax Court has not yet issued final resolutions for the proceedings related to years 2016 and 2017. As previously disclosed, in the fourth quarter of 2024, SUNAT completed its audit of the 2018 tax period, recognizing that part of the income was stabilized. In January 2025, NEXA paid USD 18,300 to obtain a 60% reduction in penalties and interests. However, these payments do not constitute an acknowledgment of liability, and the Company will continue its legal defense though the applicable instances.

SUNAT is currently auditing the 2019 tax year, while audits for 2020 and 2021 audits remain pending. The tax stability agreement expired in 2021.

NEXA is within the scope of the OECD Pillar Two model rules, which establish a new global minimum tax framework of 15% minimum tax. Pillar Two legislation was enacted in Luxembourg and in Brazil and is already in effect for financial year beginning January 1, 2024, and January 1, 2025, respectively. However, no such legislation has been enacted in Peru.

The Company performed an assessment of the group’s potential exposure to Pillar Two income taxes, by running initial testing under the OECD transitional safe harbor rules based on the most recent information available on tax filings, country-by-country reporting and financial statements for the constituent entities in the group. Based on the assessment performed, the jurisdictions where the Company operate qualify for at least one of the transitional safe harbor rules and management is not currently aware of any circumstances under which this might change. Therefore, the Company does not expect potential exposure to Pillar Two top-up tax

The Company’s financial assets and liabilities are classified as follows: