GERDAU S.A. Current Report (Foreign Issuer)

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 6-K: How Foreign Companies Report to the SEC →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 10/26/2026 - 05:22 PM EDT Accepted by SEC EDGAR 10/26/2026 - 05:19 PM EDT Learn about SEC filing dates

U.S. SECURITIES AND EXCHANGE COMMISSION 

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER 

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE 

SECURITIES EXCHANGE ACT OF 1934

Dated October 26, 2026

Commission File Number 1-14878

GERDAU S.A. 

(Translation of Registrant’s Name into English)

Av. Dra. Ruth Cardoso, 8,501 – 8° andar 

São Paulo, São Paulo - Brazil CEP 05425-070 

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  x           Form 40-F  ¨

Exhibit Index

Exhibit		Description of Exhibit
99.1		Quarterly Results 3Q26 Gerdau S.A.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: October 26, 2026

	GERDAU S.A.
	By:	/s/ Rafael Dorneles Japur
	Name:	Rafael Dorneles Japur
	Title:	Vice-President and Investor Relations Officer

Exhibit 99.1

3Q26 Results Gerdau S.A. Click here to access the videoconference RI.GERDAU.COM RI.GERDAU.COM Videoconference October 27 (Tuesday) 12:00 p.m. BRT 11:00 a.m. NY

Quarterly Results 3Q26 | Gerdau S.A. 2 São Paulo, October 26, 2026 – Gerdau S.A. (B3: GGBR / NYSE: GGB) announces its results for the third quarter of 2026. The consolidated financial statements of the Company are presented in Brazilian Reais (R$), in accordance with International Financial Reporting Standards (IFRS) and the accounting practices adopted in Brazil. The information in this report does not include the data of associates and joint controlled entities, except when stated otherwise. GERDAU RECORDS ADJUSTED EBITDA OF R$3.8 BILLION AND A MARGIN OF 20.2% IN 3Q26, ITS HIGHEST LEVEL SINCE 2023, DRIVEN BY EXPANSION IN NORTH AMERICA Steel shipments totaled 2.9 million tonnes in 3Q26, in line with 2Q26; Net sales totaled R$18.7 billion in 3Q26, up 4.6% from 2Q26; Adjusted net income of R$1.5 billion in 3Q26, up 3.9% from 2Q26; Adjusted EBITDA of R$3.8 billion in 3Q26, up 9.9% from 2Q26; Adjusted EBITDA Margin of 20.2%, 1.0 p.p. and 5.0 p.p. higher than in 2Q26 and 3Q25, respectively, the highest level since 2Q23; Positive Free Cash Flow of R$1.4 billion, benefited from lower working capital consumption; Based on the 3Q26 results, the Company has approved R$667.0 million as dividends (R$0.34 per share), to be paid as of December 15, 2026; CAPEX of R$955 million in 3Q26 and R$3.1 billion in 9M26; Progress in the final integrated testing phase for the Miguel Burnier mining project, with start-up scheduled for 4Q26; Start-up of the recycling facility in Pindamonhangaba, enhancing the competitiveness of our operations in Brazil. Fitch e S&P Global Ratings revised Gerdau’s outlook from Stable to Positive, while reaffirming the Company’s credit ratings; Gerdau was recognized as one of Brazil’s leading companies, standing out in the “Steel, Mining, and Metallurgy” category of the 2026 Best and Biggest (Exame) and the “Metallurgy and Steel” category of the Valor 1000 (Valor Econômico), the latter for the fifth consecutive year, in addition to being named the most valuable brand in the steel sector in Latin America by Brand Finance’s 2026 Latin America 100 ranking. MAIN INDICATORS 1 - Includes iron ore and co-products sales. 2 - Non-accounting measurement calculated by the Company. The Company presents Adjusted EBITDA to provide additional information on cash generated in the period. Adjusted net income excludes nonrecurring items, when applicable. 3- Measurement calculated based on Gerdau S.A.'s Net income. CONSOLIDATED 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Shipments of steel (1,000 tonnes) 2,914 2,908 0.2% 3,087 -5.6% 8,633 8,769 -1.5% Net sales1 (R$ million) 18,691 17,871 4.6% 17,983 3.9% 53,277 52,884 0.7% Adjusted EBITDA2 (R$ million) 3,771 3,430 9.9% 2,737 37.8% 10,159 7,700 31.9% Adjusted EBITDA Margin2 (%) 20.2% 19.2% 1.0 p.p 15.2% 5.0 p.p 19.1% 14.6% 4.5 p.p Adjusted net income2 (R$ million) 1,523 1,466 3.9% 1,090 39.7% 4,003 2,712 47.6% Earnings per share (R$) ³ 0.79 0.74 6.7% 0.54 45.2% 2.04 1.33 53.2% Net debt/Adjusted EBITDA 0.58x 0.69x -0.11x 0.81x -0.23x 0.58x 0.81x -0.23x Free cash flow (R$ million) 1,439 237 1,202 1,008 431 1,692 (1,018) 2,710 EXCHANGE RATE (USD x BRL) Average USD 5.1366 5.0494 1.7% 5.4488 -5.7% 5.1481 5.6502 -8.9% USD at the end of the period 5.1809 5.1766 0.1% 5.3186 -2.6% 5.1809 5.3186 -2.6%

Quarterly Results 3Q26 | Gerdau S.A. 3 MESSAGE FROM MANAGEMENT The third quarter of 2026 marked another step in the Company's profitability expansion. We recorded an Adjusted EBITDA of R$3.8 billion, up 9.9% from 2Q26 and 37.8% higher than 3Q25, along with an Adjusted EBITDA margin of 20.2%, both at their highest levels since the second quarter of 2023. This performance was mainly driven by improved realized prices in North America, which more than offset rising costs, while shipment volumes remained virtually stable compared to the previous quarter. With regard to the Company’s reportable segments, once again North America operations remained among the quarter’s key highlights, accounting for more than 76% of the Company’s consolidated EBITDA, reaching R$2.9 billion, with an EBITDA margin of 27.7% (the highest level over the last four years). Market conditions remained favorable throughout the quarter, bolstered by robust demand and an order backlog that continued well above historical averages. This scenario enabled the Company to capture the price adjustments implemented throughout the year, thus boosting profitability despite weaker volumes due to scheduled maintenance shutdowns in Canada. In Brazil, the quarter was marked by a continued competitive environment characterized by a high supply of steel products in some segments. Despite this context, Adjusted EBITDA reached R$741 million, up 5.2% from 2Q26. This result mainly reflected an improved sales mix, with exports accounting for a smaller share of total shipments. While this contributed to higher production costs, it also led to increased realized prices. We achieved shipment growth in the domestic market, particularly in the flat and special steel segments, in addition to price increases in certain product lines. In South America, Adjusted EBITDA totaled R$160 million, down 22.0% from 2Q26. Despite shipment growth at Peru operations, which hit record steel production and shipments in August, the quarter’s results were impacted by lower steel production and higher costs resulting from scheduled maintenance shutdowns, mainly concentrated in Argentina. In addition, the market remained challenging due to weak demand in Argentina and labor disputes in the civil construction sector in Uruguay. We remain committed to enhancing the Company’s competitiveness. In 3Q26, we invested a total of R$955 million in CAPEX, totaling R$3.1 billion in 9M26. As a major operational milestone, ourrecycling facility unit began its operations in Pindamonhangaba. The project expands our metal supply capacity, bolstering our competitiveness and underscoring our commitment to sustainability. Over the next few quarters, we will advance the ramp-up process, while seeking to consolidate our performance and realize the expected benefits. In addition, we are moving into the final phase of integrated testing for the Miguel Burnier sustainable mining platform, which is scheduled to begin operations in 4Q26. We remain disciplined in our capital allocation and shareholder returns. Based on our 3Q26 results, we approved a cash dividend of R$0.34 per share, totaling R$667.0 million, and continued to execute the 2026 Share Buyback Program, investing R$344.1 million to date and reaching 32% of the authorized shares. With 125 years of history, we remain firmly committed to enhancing the Company’s competitiveness, swiftly adapting to market changes, and generating a positive impact in the regions where we operate. We would like to thank our employees, customers, suppliers, partners, shareholders and other stakeholders for their trust and support in building our history and continuously creating value. THE MANAGEMENT

Quarterly Results 3Q26 | Gerdau S.A. 4 PERFORMANCE BY BUSINESS SEGMENT BRAZIL – includes the long, flat, and special steel operations and the iron ore operation located in Brazil, as well as jointly-controlled and associated companies located in Brazil; NORTH AMERICA – includes the long and special steel operations in Canada and United States, as well as jointly controlled companies in Canada and Mexico; SOUTH AMERICA – includes the operations in Argentina, Peru and Uruguay. Valuation Guide ADJUSTED EBITDA3F0F0F 1 (R$ MILLION) AND ADJUSTED EBITDA MARGIN (%) BRAZIL NORTH AMERICA SOUTH AMERICA 1 Non-accounting measurement calculated by the Company. The Company states Adjusted EBITDA to provide additional information on cash generated in the period. The percentage of Adjusted EBITDA from business segments is calculated considering the total Adjusted EBITDA of the three business segments. Annual Report

Quarterly Results 3Q26 | Gerdau S.A. 5 BRAZIL PRODUCTION & SHIPMENTS ▪ In 3Q26, crude steel production was 5.7% and 10.4% lower than in 2Q26 and 3Q25, respectively, mainly reflecting scheduled shutdowns at the Ouro Branco unit, partially offset by higher production volumes of special steels. The segment’s capacity utilization rate was 77% versus 79% in 2Q26 and 85% in 3Q25. During the period, installed crude steel capacity declined from 7.9 million to 7.7 million tonnes per year due to the melt shop area shutdown at the Açonorte unit in Recife (PE); ▪ According to Brazil Steel Institute data, apparent steel consumption in Brazil grew 6.3% versus 2Q26, mainly driven by flat steel (+9.2%). Nevertheless, in 9M26, apparent consumption was 4.6% lower year-over-year, due to weaker demand throughout the year. In 3Q26, total imports rose 19.8% versus 2Q26, fueled especially by flat steel, whose imports increased 33.8% quarter-over-quarter, contributing to a more competitive environment in the domestic market; ▪ During the quarter, steel demand remained subdued, mainly due to the impact of high interest rates on industrial activity and the increased caution of customers amid political and economic uncertainties. In civil construction, activity in the sector continues to be sustained by residential construction for lower-income segments; ▪ In the automotive industry, signs of upturn were observed throughout 3Q26, boosted by light vehicle production. According to data from the National Association of Motor Vehicle Manufacturers (ANFAVEA), light vehicle production grew by nearly 10% in 9M26 compared to the same period in 2025, while heavy vehicle production declined by approximately 7%. Despite this improvement, the high share of imported vehicles continues to hinder a consistent recovery in domestic production. In September 2026, imported vehicles accounted for 20.3% of total new vehicle registrations, which is 2.9 p.p. higher than in the same month of the previous year; ▪ In 3Q26 total shipments remained in line with 2Q26, as the 5.9% domestic shipments growth, mostly of flat steel, offset the decline in exports. Year-over-year, total shipments were 14.6% lower, with declines in both domestic shipments and exports. Nevertheless, the share of exports in total shipments fell from 21% in 3Q25 to 13% in 3Q26, in line with the restructuring of operations in Brazil and the efforts to increase the share of shipments to the domestic market; BRAZIL 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Volumes (1,000 tonnes) Production of crude steel 1,471 1,560 -5.7% 1,641 -10.4% 4,500 4,505 -0.1% Shipments of steel 1,351 1,352 -0.1% 1,582 -14.6% 4,027 4,370 -7.8% Domestic market 1,179 1,113 5.9% 1,252 -5.8% 3,328 3,494 -4.8% Exports 172 239 -28.0% 330 -47.9% 699 876 -20.2% Shipments of long steel 886 961 -7.8% 1,117 -20.7% 2,794 3,029 -7.8% Domestic market 759 739 2.7% 862 -12.0% 2,202 2,465 -10.7% Exports 127 222 -42.9% 255 -50.2% 592 564 4.9% Shipments of flat steel 465 391 18.9% 465 -0.1% 1,233 1,341 -8.0% Domestic market 420 374 12.1% 390 7.7% 1,126 1,029 9.4% Exports 45 16 181.3% 75 -40.1% 107 312 -65.6%

Quarterly Results 3Q26 | Gerdau S.A. 6 OPERATING RESULT 1- Includes iron ore and co-products sales. 2- Non-accounting measurement reconciled with information stated in the Note 22 to the Company’s Financial Statements, as set forth by CVM Resolution No. 156 of June 23, 2022. ▪ In 3Q26, Net sales went up 3.9% versus 2Q26, reflecting a higher share of shipments to the domestic market and a slight improvement in domestic prices for some product lines. Year-over-year, Net sales declined by 9.7% as the 5.7% Net sales per tonne growth was insufficient to offset weaker shipment volumes during the period. ▪ The Cost of goods sold came 2.4% higher than in 2Q26, explained by increased shipments of higher value-added products in the domestic market and rising costs associated with scheduled shutdowns during the period (in addition to higher prices for certain inputs, such as coal, diesel, and imported materials). Year-over-year, the Cost of goods sold went down 10.8%, in line with the decline in shipment volumes, although the cost per tonne increased by 4.5% due to inflationary pressure on the operation’s main inputs; ▪ As a result, Adjusted EBITDA was 5.2% higher than in 2Q26, with an Adjusted EBITDA margin of 10.7%. Adjusted EBITDA totaled R$2.0 billion in 9M26, mainly impacted by the competitive environment observed throughout the year and by weaker shipment volume compared to the same period in 2025. BRAZIL 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Results (R$ million) Net sales¹ 6,948 6,686 3.9% 7,697 -9.7% 19,905 22,507 -11.6% Domestic market 6,260 5,816 7.6% 6,532 -4.2% 17,346 19,054 -9.0% Exports 688 870 -20.9% 1,164 -40.9% 2,559 3,453 -25.9% Cost of goods sold (6,508) (6,356) 2.4% (7,294) -10.8% (18,918) (20,787) -9.0% Gross profit 440 329 33.7% 403 9.2% 987 1,720 -42.6% Gross margin (%) 6.3% 4.9% 1.4 p.p 5.2% 1.1 p.p 5.0% 7.6% -2.7 p.p Selling, general and administrative expenses (245) (221) 10.9% (245) - (689) (726) -5.1% Other operating income (expenses) (86) (25) 247% (26) 236% (127) (33) 286% Depreciation and amortization 582 574 1.4% 556 4.5% 1,705 1,592 7.2% Proportional EBITDA of associated companies and jointly controlled entities 51 48 6.2% 75 -32.0% 147 183 -19.7% Adjusted EBITDA² 741 705 5.2% 763 -2.8% 2,024 2,736 -26.0% Adjusted EBITDA Margin² (%) 10.7% 10.5% 0.1 p.p 9.9% 0.8 p.p 10.2% 12.2% -2.0 p.p

Quarterly Results 3Q26 | Gerdau S.A. 7 NORTH AMERICA PRODUCTION & SHIPMENTS ▪ In 3Q26, crude steel production came 4.7% lower than in 2Q26, reflecting scheduled shutdowns carried out throughout the quarter, including the shutdown at the Midlothian (TX) unit, related to the investment to expand production capacity. Year-over-year, production went up 5.2%, reflecting a more favorable market scenario for local steel producers. The capacity utilization rate was 83% in 3Q26 versus 87% in 2Q26 and 79% in 3Q25, with the special steel units standing out, as their utilization increased by 6 p.p. compared to the previous quarter; ▪ Demand remained resilient in 3Q26, driven by the nonresidential construction, data center, and renewable energy segments. Order backlog closed the quarter at over 100 days, nearly 50% above historical averages. In the special steel segment, shipment volumes remained stable versus the previous quarter, which had recorded the highest shipment level since 2019, benefiting from a decline in imports and a gradual upturn in industrial activity; ▪ Steel shipments went down 2.5% versus 2Q26 and grew 1.5% over 3Q25. The quarterly decline mainly reflected the strong comparison base from the previous quarter, which had recorded its highest quarterly shipment volume since the Company adopted its current industrial structure. By product category, downstream shipments slowed down approximately 21% quarter-over-quarter, mainly impacted by lower shipments to the solar energy sector following an exceptionally strong second quarter, in line with market seasonality and the demand that had been brought forward in the previous period. OPERATING RESULT 1- Non-accounting measurement reconciled with information stated in the Note 22 to the Company’s Financial Statements, as set forth by CVM Resolution No. 156 of June 23, 2022. ▪ In 3Q26, Net sales was 3.8% higher than in 2Q26, fueled by price adjustments implemented over the past few months for its main product lines, which more than offset the decline in shipment volumes. Net sales per tonne, in U.S. dollars, grew 4.7% in the quarter, accounting for an increase of approximately US$70 per tonne in realized prices. Year-over-year, Net sales was 14.4% higher, reflecting the improved pricing environment, partially offset by the U.S. dollar depreciation (–5.7%); ▪ Cost of sales per tonne was 0.4% lower than in 2Q26, despite higher costs associated with scheduled maintenance shutdowns and the U.S. dollar appreciation dollar against the Brazilian real (+1.7%). This performance reflected stable scrap prices and operational discipline in common and special long steel products throughout the period. Year-over-year, the Cost of goods sold went up 1.6%, with a 6.2% higher cost per tonne in U.S. dollars, mainly due to rising metal costs and higher value-added product mix. Even so, NORTH AMERICA 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Volumes (1,000 tonnes) Production of crude steel 1,423 1,493 -4.7% 1,353 5.2% 4,428 4,233 4.6% Shipments of steel 1,313 1,347 -2.5% 1,293 1.5% 3,936 3,778 4.2% Bars 566 569 -0.6% 554 2.2% 1,681 1,610 4.4% Shapes 683 697 -2.0% 663 3.0% 2,049 1,973 3.9% Downstream 63 80 -20.9% 76 -16.8% 206 195 5.3% NORTH AMERICA 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Results (R$ million) Net sales 10,512 10,126 3.8% 9,185 14.4% 29,988 27,092 10.7% Cost of goods sold (7,766) (7,798) -0.4% (7,643) 1.6% (22,993) (23,160) -0.7% Gross profit 2,747 2,328 18.0% 1,542 78.1% 6,995 3,932 77.9% Gross margin (%) 26.1% 23.0% 3.1 p.p 16.8% 9.3 p.p 23.3% 14.5% 8.8 p.p Selling, general and administrative expenses (195) (181) 7.4% (186) 4.8% (564) (603) -6.5% Other operating income (expenses) (64) 15 - (3) 2,033% (38) 28 - Depreciation and amortization 281 273 2.9% 313 -10.2% 835 940 -11.2% Proportional EBITDA of associated companies and jointly controlled entities 143 166 -13.9% 155 -7.7% 536 356 50.6% Adjusted EBITDA¹ 2,912 2,600 12.0% 1,820 60.0% 7,764 4,653 66.9% Adjusted EBITDA Margin1 (%) 27.7% 25.7% 2.0 p.p 19.8% 7.9 p.p 25.9% 17.2% 8.7 p.p

Quarterly Results 3Q26 | Gerdau S.A. 8 increased costs remained significantly lower than the Net sales growth per tonne, contributing to improved profitability in the quarter; ▪ As a result, Adjusted EBITDA went up 12.0% and 60.0% from 2Q26 and 3Q25, respectively, with an Adjusted EBITDA margin of 27.7%, the highest level in the last four years. In 9M26, Adjusted EBITDA came R$3.1 billion higher than in 9M25, fueled by a combination of higher prices, robust operational efficiency, and the contribution of pro-rata EBITDA from jointly controlled entities. SOUTH AMERICA PRODUCTION & SHIPMENTS 1 – Includes resale of products imported from the Brazil Segment. ▪ In 3Q26, crude steel production was 29.4% and 24.8% lower than in 2Q26 and 3Q25, respectively, mainly reflecting lower production in Argentina, which was impacted by scheduled maintenance shutdowns carried out during the quarter and weaker demand. As a result, the segment’s capacity utilization rate fell to 54%, versus 77% in 2Q26 and 72% in 3Q25; ▪ Steel shipments came 9.7% and 7.1% higher than in 2Q26 and 3Q25, respectively, fueled by the civil construction sector in Peru. Our operations in the country posted solid performance throughout the quarter, highlighted by record shipments in August. This performance offset weaker shipment volumes in Argentina and Uruguay, markets that are still impacted by a heightened competitive environment and still-weak demand in certain segments of the civil construction sector. OPERATING RESULT 1- Non-accounting measurement reconciled with information stated in the Note 22 to the Company’s Financial Statements, as set forth by CVM Resolution No. 156 of June 23, 2022. ▪ In 3Q26, Net sales went up 12.6% from 2Q26, mainly reflecting shipment volumes growth in Peru, as well as the U.S. dollar appreciation against the Brazilian real (+1.7%). Year-over-year, Net sales was 4.7% higher, as shipment volumes growth and a recovery in prices offset the effect of the U.S. dollar depreciation against the Brazilian real (-5.7%); ▪ Cost of goods sold came 17.7% and 10.5% higher than in 2Q26 and 3Q25, respectively. In addition to higher sales volumes, cost performance was impacted by lower steel production due to scheduled maintenance shutdowns during the quarter, as well as lower dilution of fixed costs; ▪ As a result, Adjusted EBITDA came 22.0% and 31.8% lower than in 2Q26 and 3Q25, respectively, with an Adjusted EBITDA margin of 11.1%. In 9M26, despite shipment growth, the foreign exchange effect (-10.5%) offset the operating gains for the period. SOUTH AMERICA 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Volumes (1,000 tonnes) Production of crude steel 123 175 -29.4% 164 -24.8% 465 456 1.9% Shipments of steel¹ 309 282 9.7% 289 7.1% 897 814 10.2% SOUTH AMERICA 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Results (R$ million) Net sales 1,440 1,279 12.6% 1,376 4.7% 4,115 4,073 1.0% Cost of goods sold (1,304) (1,108) 17.7% (1,180) 10.5% (3,653) (3,605) 1.3% Gross profit 136 171 -20.6% 196 -30.7% 462 468 -1.3% Gross margin (%) 9.4% 13.4% -3.9 p.p 14.2% -4.8 p.p 11.2% 11.5% -0.3 p.p Selling, general and administrative expenses (45) (43) 4.7% (37) 21.3% (130) (124) 4.5% Other operating income (expenses) (7) 2 - 7 - (2) 12 - Depreciation and amortization 76 75 1.3% 69 10.1% 221 217 1.8% Adjusted EBITDA ¹ 160 205 -22.0% 234 -31.8% 550 572 -3.8% Adjusted EBITDA Margin1 (%) 11.1% 16.0% -4.9 p.p 17.0% -5.9 p.p 13.4% 14.0% -0.7 p.p

Quarterly Results 3Q26 | Gerdau S.A. 9 CONSOLIDATED RESULTS The consolidated results for 3Q26 reflected continued profitability expansion, driven by strong operating performance in North America, which continued to benefit from a favorable environment in terms of demand and prices. In Brazil, profitability improved gradually, even amid a more competitive market environment. In 3Q26, Brazil and North America accounted for similar shares of steel shipments across the segments, at 45.4% and 44.2%, respectively. Despite the similarity in shipment volumes, our North America operations accounted for 55.6% of consolidated Net sales and 76.4% of consolidated Adjusted EBITDA, highlighting its greater contribution to the Company’s value creation during the period. PRODUCTION & SHIPMENTS CONSOLIDATED 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Volumes (1,000 tonnes) Crude steel production 3,017 3,228 -6.5% 3,157 -4.4% 9,393 9,194 2.2% Shipments of steel 2,914 2,908 0.2% 3,087 -5.6% 8,633 8,769 -1.5% In 3Q26, crude steel production was 6.5% and 4.4% lower than in 2Q26 and 3Q25, respectively, mainly reflecting scheduled maintenance shutdowns carried out at various Company operations throughout the quarter. As a result, the consolidated production capacity utilization rate reached 78% in 3Q26, down 4 p.p. from 2Q26 and 3 p.p. lower than in 3Q25. Despite lower production, steel shipments totaled 2.9 million tonnes in 3Q26, remaining stable versus 2Q26. This result was sustained by resilient demand in the key markets where we operate, particularly in North America, Brazil, and Peru operations. Year-over-year, steel shipments were down 5.6%, mainly reflecting lower activity in Brazil. STEEL SHIPMENTS (1,000 TONNES) BY SEGMENT (%) BRAZIL NORTH AMERICA SOUTH AMERICA

Quarterly Results 3Q26 | Gerdau S.A. 10 GROSS PROFIT Net sales totaled R$18.7 billion in 3Q26, 4.6% higher than in 2Q26, mainly fueled by realized prices in North America, the increased share of higher value-added products in the consolidated product mix, and the U.S. dollar appreciation against the Brazilian real. Year-over-year, Net sales came 3.9% higher, reflecting price increases in North America, which more than offset the decline in shipment volumes in Brazil, as well as the impact of the U.S. dollar depreciation against the Brazilian real (–5.7%). Cost of goods sold came 2.0% higher than in 2Q26, driven by the U.S. dollar appreciation against the Brazilian real and by higher costs associated with scheduled shutdowns carried out at various Company operations. Year-over-year, Cost of goods sold went down 3.2%, reflecting weaker volumes and the U.S. dollar depreciation against the Brazilian real, partially offset by costs associated with scheduled shutdowns during the period. On a comparable basis, excluding foreign exchange effects and, most notably, the impacts of industrial units shutdowns in 3Q26, the consolidated cost per tonne remained stable versus 2Q26 and 3Q25, highlighting the operational discipline and efficiency gains achieved over the period. As a result, Gross profit totaled R$3.4 billion in 3Q26, 18.4% and 56.4% higher than in 2Q26 and 3Q25, respectively. In 9M26, Gross profit was 38.5% higher than in the same period of 2025, mainly reflecting the robust profitability of North America operations and the operational discipline sustained throughout the period, as explained earlier. NET SALES (R$ MILLION) SHARE BY SEGMENT (%) CONSOLIDATED 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Results (R$ million) Net sales 18,691 17,871 4.6% 17,983 3.9% 53,277 52,884 0.7% Cost of goods sold (15,340) (15,041) 2.0% (15,841) -3.2% (44,803) (46,765) -4.2% Gross profit 3,351 2,829 18.4% 2,142 56.4% 8,474 6,119 38.5% Gross margin 17.9% 15.8% 2.1 p.p 11.9% 6.0 p.p 15.9% 11.6% 4.3 p.p BRAZIL NORTH AMERICA SOUTH AMERICA

Quarterly Results 3Q26 | Gerdau S.A. 11 SELLING, GENERAL & ADMINISTRATIVE EXPENSES Selling, general & administrative expenses (SG&GA) totaled R$533 million in 3Q26, 3.0% and 4.0% higher than in 2Q26 and 3Q25, respectively. Despite the nominal increase, expenses rose at a slower pace than consolidated Net sales, reflecting continued discipline in expense management. As a percentage of Net sales, SG&A ended the quarter at 2.8%, slightly lower than in 2Q26 and in line with 3Q25. ADJUSTED EBITDA AND ADJUSTED EBITDA MARGIN 1 – Non-accounting measurement calculated in accordance with CVM Resolution No. 156 of June 23, 2022. 2 – Non-accounting measurement reconciled with information stated in the Company’s Financial Statements, as set forth by CVM Resolution No. 156 of June 23, 2022. (a) Amounts composed of the lines “Proportional operating income before financial result and taxes of associated companies and jointly controlled entities” and “Proportional depreciation and amortization of associated companies and jointly controlled entities" in Note 22 to the Company’s Financial Statements. Gerdau ended 3Q26 with an Adjusted EBITDA of R$3.8 billion and an Adjusted EBITDA Margin of 20.2%. Quarter-over-quarter, Adjusted EBITDA went up 9.9%, mainly reflecting the price adjustments implemented throughout the year, which contributed approximately R$559 million to the quarter’s results. This positive effect was partially offset by higher operating costs. From the region perspective, North America remained the main driver of consolidated EBITDA growth, contributing R$312 million, while Brazil added R$36 million and South America posted a decrease of R$45 million. Adjusted EBITDA increased by R$1.0 billion year-over-year. The main driver of growth was improved realized prices, which contributed approximately R$2.3 billion to the period’s results and more than offset higher operating costs, weaker shipment volumes, and foreign exchange effects observed over the last 12 months. North America accounted for all of the year-over-year growth consolidated EBITDA, reflecting the region's solid operational profitability. CONSOLIDATED 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Results (R$ million) SG&A (533) (517) 3.0% (512) 4.0% (1,572) (1,612) -2.5% Selling expenses (200) (189) 5.5% (196) 1.8% (574) (595) -3.5% General and admininstrative expenses (333) (328) 1.5% (316) 5.3% (997) (1,017) -1.9% % SG&A/Net Sales 2.8% 2.9% -0.1 p.p 2.8% - 3.0% 3.0% - BREAKDOWN OF CONSOLIDATED EBITDA - (R$ million) 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Net income 1,563 1,466 6.6% 1,090 43.4% 4,043 2,712 49.0% Net financial result 431 308 39.9% 223 93.1% 1,059 866 22.3% Provision for income and social contribution taxes 722 559 29.1% 346 108.6% 1,781 952 87.1% Depreciation and amortization 938 921 1.8% 938 - 2,761 2,748 0.5% EBITDA - CVM Instruction¹ 3,654 3,254 12.3% 2,597 40.7% 9,644 7,278 32.5% Equity in earnings of unconsolidated companies (30) (55) -46.3% (89) -66.7% (167) (124) 33.8% Proportional EBITDA of associated companies and jointly controlled entities (a) 194 214 -9.5% 229 -15.6% 684 540 26.7% Losses due to non-recoverability of financial assets 13 17 -23.6% - - 58 7 781.3% Non-recurring items (60) - - - - (60) - - Credit recovery/provisions (60) - - - - (60) - - Adjusted EBITDA² 3,771 3,430 9.9% 2,737 37.8% 10,159 7,700 31.9% Adjusted EBITDA margin 20.2% 19.2% 1.0 p.p 15.2% 5.0 p.p 19.1% 14.6% 4.5 p.p CONCILIATION OF CONSOLIDATED EBITDA - (R$ million) 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ EBITDA - CVM Instruction¹ 3,654 3,254 12.3% 2,597 40.7% 9,644 7,278 32.5% Depreciation and amortization (938) (921) 1.8% (938) 0.0% (2,761) (2,748) 0.5% OPERATING INCOME BEFORE FINANCIAL RESULT AND TAXES 2,716 2,332 16.5% 1,659 63.7% 6,882 4,530 51.9%

Quarterly Results 3Q26 | Gerdau S.A. 12 QUARTERLY CHANGE IN ADJUSTED EBITDA (R$ MILLION) ADJUSTED EBITDA (R$ MILLION) AND ADJUSTED EBITDA MARGIN (%) FINANCIAL RESULT CONSOLIDATED (R$ million) 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Financial result (431) (308) 39.9% (223) 93.1% (1,059) (866) 22.3% Financial income 122 112 8.4% 192 -36.6% 360 487 -26.0% Financial expenses (477) (453) 5.3% (536) -11.1% (1,372) (1,430) -4.1% Exchange variation (34) 86 - 178 - 133 342 -61.0% Inflation adjustments in Argentina (36) (55) -34.5% (27) 34.3% (158) (156) 1.1% Financial expenses from Bonds buybacks - - - - - - (40) - Gains on financial instruments, net (6) 2 - (29) -80.1% (23) (68) -66.4% The Financial result was negative R$431 million, up 39.9% and 93.1% from 2Q26 and 3Q25, respectively, mainly due to foreign exchange effects in the comparable periods.

Quarterly Results 3Q26 | Gerdau S.A. 13 ADJUSTED NET INCOME 1– Accounting measurement disclosed in the Company’s Income Statement. 2 - Non-accounting measurement calculated by the Company to state the Net income adjusted for non-recurring items that influenced results, if applicable. 3 - Measurement calculated based on Net income of Gerdau S.A. Adjusted Net income totaled R$1.5 billion, up 3.9% and 39.7% from 2Q26 and 3Q25, respectively. Both variations are explained by the dynamics of the Company’s operating and financial results, as detailed in the explanations of Adjusted EBITDA and Financial result. ADJUSTED NET INCOME (R$ MILLION) AND ADJUSTED NET MARGIN (%) CONSOLIDATED (R$ million) 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Operating Income before Financial Result and Taxes¹ 2,716 2,332 16.5% 1,659 63.7% 6,882 4,530 51.9% Financial result (431) (308) 39.9% (223) 93.1% (1,059) (866) 22.3% Income before taxes¹ 2,285 2,024 12.9% 1,436 59.2% 5,823 3,664 58.9% Income and social contribution taxes (722) (559) 29.1% (346) 108.6% (1,781) (952) 87.1% Net income¹ 1,563 1,466 6.6% 1,090 43.4% 4,043 2,712 49.1% Non-recurring items (40) - - - - (40) - - Credit recovery/provisions (60) - - - - (60) - - Income tax and social contribution - nonrecurring items 21 - - - - 21 - - Adjusted net income² 1,523 1,466 3.9% 1,090 39.7% 4,003 2,712 47.6% Earnings per share (R$) ³ 0.79 0.74 6.7% 0.54 45.2% 2.04 1.33 53.2%

Quarterly Results 3Q26 | Gerdau S.A. 14 The Net debt/Adjusted EBITDA ratio ended the quarter at 0.58x, a healthy leverage level, comfortably within the Company’s leverage policy, reiterating the Company's capacity to execute its investments commitments necessary for its business’ developments. CAPITAL STRUCTURE AND INDEBTEDNESS DEBT BREAKDOWN (R$ million) 3Q26 2Q26 ∆ 3Q25 ∆ Short term 555 630 -11.9% 3,315 -83.3% Long term 13,174 12,928 1.9% 15,329 -14.1% Gross debt 13,729 13,558 1.3% 18,644 -26.4% Gross debt / Total capitalization¹ 20.1% 20.2% - 25.6% -5.5 p.p Cash, cash equivalents and short-term investments 6,043 5,440 11.1% 9,874 -38.8% Net debt 7,686 8,118 -5.3% 8,770 -12.4% Net debt ² (R$) / Adjusted EBITDA ³ (R$) 0.58x 0.69x -0.11x 0.81x -0.23x 1- Total capitalization = Shareholders’ equity + Gross debt – Interest on debt. 2-Net debt = Gross debt – Interest on debt – Cash, cash equivalents, and financial investments. 3-Adjusted EBITDA in the last 12 months. On September 30, 2026, Gross debt totaled R$13.7 billion, 1.3% higher than in 2Q26 due to the U.S. dollar appreciation against the Brazilian real during the period and bank loans raised with first-tier institutions totaling approximately R$276 million. In terms of cash position, we ended the quarter with R$6.0 billion in available cash, resulting in a Net debt of R$7.7 billion for the period and a Net debt/EBITDA ratio of 0.58x, a lower level versus 2Q26 and 3Q25, mainly reflecting the Adjusted EBITDA growth over the last 12 months and the Net debt decline. At quarter-end, the Gross debt exposure by currency was nearly 53% denominated in U.S. dollars, 46% in Brazilian reais and 1% in other currencies. In relation to the average payment term, we ended at 7.5 years, and the weighted average nominal cost was 6.13% per annum for U.S. dollar-denominated debts and CDI –0.21% for Brazilian reais-denominated debts. It is worth noting that, in 3Q26, the Company’s Global Revolving Credit Facility (RCF) was renewed for a 5-year term, replacing funds available from US$875 million to US$1.125 billion, an approximate increase of 29%, thereby reinforcing the Company’s liquidity position. On September 30, 2026, the Company’s RCF totaling US$1.125 billion (equivalent to R$5.8 billion), was fully available. DEBT (R$ BILLION) & LEVERAGE RATIO LIQUIDITY POSITION AND DEBT AMORTIZATION (R$ BILLION)

Quarterly Results 3Q26 | Gerdau S.A. 15 INVESTMENTS (CAPEX) CAPEX totaled R$955 million, 5.3% lower than in 2Q26, totaling R$3.1 billion in 9M26, equivalent to 66% of the total planned for the year. Of the amount invested in the quarter, 45% was allocated to Maintenance and 55% to Competitiveness, in line with the Company’s strategy to boost efficiency and reduce its operating costs. In 3Q26, 79% of the CAPEX were allocated to operations in Brazil. The recycling facility unit began its operations in Pindamonhangaba, marking a major milestone in the execution of the Company's key projects for the year. This expansion increases our operational capacity for metals and enhances the competitiveness of our Brazil operations. In addition, we continue to make progress toward completing the integrated testing phase of the Miguel Burnier sustainable mining platform, which is scheduled to begin operations in the fourth quarter of 2026. In North America, the investment to expand capacity at the Midlothian (TX) unit continues to evolve on schedule. In 3Q26, we began the scheduled shutdown of the melt shop area to carry out the final phase of the project. The planned start-up is scheduled for late 2026. The project will add approximately 150 thousand tonnes of crude steel capacity per year to our largest North American asset, while also improving productivity and operational efficiency. The unit will continue to undergo scheduled shutdowns during 4Q26; however, the Company does not expect any material impact on shipment volumes, supported by the use of semi-finished product inventories built up over recent quarters. TOTAL CAPEX (R$ MILLION) WORKING CAPITAL & CASH CONVERSION CYCLE Working capital ended 3Q26 totaling R$16.2 billion, 1.5% and 11.2% higher than in 2Q26 and 4Q25, respectively. These changes mainly reflect increased Accounts receivable, in line with the Company’s sales and Inventories growth, in preparation for the scheduled shutdown in Midlothian, North America. These effects were partially offset by increased Accounts payable during the period. As a result, the financial cycle (Working capital divided by Net sales in the quarter) decreased 2 days vs. 2Q26 and increased 1 day vs. 4Q25, ending the quarter at 78 days. Detailed information on Working capital accounts is presented in Notes 5, 6 and 11 to the Financial Statements.

Quarterly Results 3Q26 | Gerdau S.A. 16 FREE CASH FLOW CONSOLIDATED (R$ million) 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Adjusted EBITDA 3,771 3,430 341 2,737 1,034 10,159 7,700 2,459 Working capital¹ (272) (933) 661 305 (577) (2,185) (748) (1,437) Income tax² (548) (657) 109 (60) (488) (1,298) (835) (464) CAPEX³ (1,101) (1,064) (37) (1,713) 613 (3,333) (5,212) 1,879 Interest4 (69) (630) 561 (107) 38 (770) (721) (49) Proportional EBITDA of JVs5 (189) 56 (245) (227) 38 (391) (511) 120 Intangibles and leasing6 (179) (171) (8) (167) (12) (499) (476) (23) Others7 27 206 (179) 240 (213) 10 (215) 225 Free cash flow 1,439 237 1,202 1,008 431 1,692 (1,018) 2,710 1- Includes the cash effect of customers, inventories, and suppliers accounts. 2- Includes the cash effect of income tax on the Company’s several subsidiaries, as well as the portion accrued in previous periods and due in the current period. 3-Includes the addition in CAPEX investments, adjusted for the cash effect of the change in accounts payable to property, plant, and equipment suppliers related to acquisitions from previous periods, paid in the current period. 4- Includes the payment of interest on loans and financing and interest on lease. 5- Proportional EBITDA of associated companies and joint controlled entities (joint ventures), net of dividends received from these JVs. 6- Disbursements for other intangible assets and lease payments. 7- Other changes include the Other Assets and Liabilities accounts. RECONCILIATION OF ADJUSTED EBITDA TO FREE CASH FLOW (R$ MILLION) Free cash flow was positive R$1.4 billion in 3Q26, R$1.2 billion higher than in 2Q26, primarily driven by Adjusted EBITDA growth, lower working capital consumption (-71%) and reduced interest payments, which were significantly lower than those recorded in the previous quarter. Year-over-year, Free cash flow increased R$431 million, driven by significant growth in Adjusted EBITDA and lower disbursements of CAPEX, partially offset by working capital consumption. RECONCILIATION OF FREE CASH FLOW WITH THE CASH FLOW STATEMENT 1 – Non-accounting measurement calculated by the Company to state Free cash flow. 2 – Accounting measurement disclosed in the Company’s Cash flow statement. CONSOLIDATED (R$ million) 3Q26 2Q26 ∆ 3Q25 ∆ 9M26 9M25 ∆ Free cash flow¹ 1,439 237 1,202 1,008 431 1,692 (1,018) 2,710 (+) Purchases of property, plant and equipment 1,101 1,064 37 1,713 (613) 3,333 5,212 (1,878) (+) Additions in other intangibles 49 38 11 50 (0) 125 124 1 (+) Leasing payment 130 133 (3) 117 12 374 352 22 (-) Short-term investments (43) (94) 50 135 (179) (140) (354) 214 (+) Proceeds from maturities and sales of shortterm investments 22 156 (134) (98) 121 358 524 (166) Net cash provided by operating activities² 2,697 1,535 1,162 2,925 (228) 5,741 4,840 901

Quarterly Results 3Q26 | Gerdau S.A. 17 NET CASH VARIATION (R$ MILLION) We ended 3Q26 with a cash balance of R$6.0 billion, an increase of R$603 million versus 2Q26, mainly reflecting higher Free cash flow, partially offset by the R$300 million payment for the acquisition of equity interest in Dona Francisca Energética S.A. RETURN TO SHAREHOLDERS DIVIDENDS On October 26, 2026, the Board of Directors of Gerdau S.A. approved the cash dividends of R$0.34 per share, equivalent to R$667.0 million. The payment will be made on December 15, 2026, based on shareholders of record on November 10, 2026, with ex-dividend date on November 11, 2026. The Company maintains its policy of distributing the minimum amount of 30% of parent company Gerdau S.A.’s corporate annual Net income after recording the reserves provided for in its Bylaws. SHARE BUYBACK PROGRAM As released in the Material Fact of February 23, 2026, the Board of Directors approved a new share buyback program (“2026 Buyback Program”) issued by Gerdau S.A., with an amount of up to 55,000,000 preferred shares to be repurchased, representing approximately 4.4% of outstanding preferred shares (GGBR4) and/or ADRs backed by outstanding preferred shares (GGB) and up to 1,441,120 common shares, representing approximately 10% of outstanding common shares (GGBR3). As of September 30, 2026, the Company had repurchased 607,400 common shares and 17,234,300 preferred shares under the 2026 Buyback Program, totaling R$342.8 million. In addition, during October1F2, 58,300 common shares were repurchased, equivalent to R$1,3 million. As a result, Gerdau S.A. has reached approximately 32% of the 2026 Buyback Program, nearly 17.9 million shares (including GGBR3 and GGBR4), totaling an investment of R$344.1 million in referred program. Management points out that the current share buyback plan remains in effect. In addition, on October 26, 2026, the Board of Directors approved the cancellation of 277,600 common shares issued by the Company. After the cancellation of shares, the Company’s share capital will consist of 716,698,119 common shares and 1,261,042,330 preferred shares, all with no par value. Maintaining a consistent shareholder return strategy through the payment of dividends in line with the policy and the solid execution of the share buyback program, the Company distributed R$698.6 million in 3Q26, or a payout of 47.3%. 2Considers buybacks made through October 9, 2026.

Quarterly Results 3Q26 | Gerdau S.A. 18 RETURN TO SHAREHOLDERS 1 – Dividends consider the amounts resolved to be paid on December 15, 2026, and buyback considers operations carried until September 30, 2026. 2 – Measurement calculated considering payout and shares repurchased divided by the parent company’s Net income after recording the reserves provided for in its Bylaws. CAPITAL MARKETS On September 30, 2026, Gerdau S.A. shares were priced at R$24.27/shares (GGBR4), R$20.64/share (GGBR3) and US$4.72/share (GGB). The Company voluntarily complies with the standards of the Level 1 Corporate Governance listing segment of B3 S.A., the Brazilian stock exchange, where its shares are traded, with high standards in information disclosure, transparency, and corporate governance. In the U.S. market, Gerdau S.A. shares have been traded in the New York Stock Exchange since 1999 through the issuance of Level II ADRs, which requires compliance with all the registrations set forth in the Securities Act, of 1933, and information disclosure requirements in the Securities Exchange Act, of 1934. SHARE PERFORMANCE VS. IBOVESPA (BASE 100) Source: Bloomberg

Quarterly Results 3Q26 | Gerdau S.A. 19 GGBR4 LIQUIDITY GGB LIQUIDITY Source: Bloomberg On September 30, 2026, the Company’s share capital comprised 716,975,719 common shares and 1,261,042,330 preferred shares, of which 219,300 common shares and 16,061,110 preferred shares were held in treasury. On the same date, Gerdau’s S.A.’s market cap42F 3 totaled approximately R$47.6 billion. In 3Q26, the free float of common and preferred shares accounted for nearly 63.5% of total shares, reaching 1,258,536,885 shares. FREE FLOAT DISTRIBUTION (GGBR4): B3 + NYSE REFERENCE DATE 09/30/2026 OWNERSHIP STRUCTURE (GGBR3 + GGBR4) REFERENCE DATE 09/30/2026 RATINGS The international credit rating agencies Fitch and S&P Global Ratings announced a revision of Gerdau’s outlook from stable to positive, while both affirmed the company’s credit ratings at ‘brAAA’ on the national scale and ‘BBB’ on the global scale. These assessments reflect the resilience of our business, the financial discipline we continue to uphold, and confidence in our ability to continue creating value in the coming years. Credit Rating Agencies Reports 3The market cap considers only outstanding shares, not including shares held in treasury. AGENCY NATIONAL SCALE GLOBAL SCALE OUTLOOK LAST UPDATE Standard & Poors brAAA BBB Positive October, 2026 Fitch Ratings brAAA BBB Positive July, 2026 Moody’s - Baa2 Stable March, 2026

Quarterly Results 3Q26 | Gerdau S.A. 20 APPENDICES ASSETS GERDAU S.A. CONSOLIDATED BALANCE SHEETS In thousands of Brazilian reais (R$) 09/30/2026 12/31/2025 CURRENT ASSETS Cash and cash equivalents 5,695,892 5,929,170 Short-term investments 347,571 445,627 Trade accounts receivable 6,227,263 4,810,640 Inventories 16,490,132 14,731,081 Tax credits 789,335 1,282,249 Income and social contribution taxes recoverable 276,835 685,811 Dividends receivable 4,875 4,981 Fair value of derivatives 17,128 36,623 Other current assets 796,638 678,899 30,645,669 28,605,081 NON-CURRENT ASSETS Tax credits 1,453,777 1,429,324 Deferred income taxes 2,542,755 2,561,980 Judicial deposits 145,750 150,893 Other non-current assets 336,336 387,708 Prepaid pension cost 9,326 9,328 Investments in associates and joint ventures 3,526,013 3,944,474 Goodwill 11,289,391 11,995,727 Right of use 1,612,352 1,271,462 Other intangibles 1,269,957 691,365 Property, plant and equipment, net 31,114,199 30,640,833 53,299,856 53,083,094 TOTAL ASSETS 83,945,525 81,688,175

Quarterly Results 3Q26 | Gerdau S.A. 21 LIABILITIES GERDAU S.A. CONSOLIDATED BALANCE SHEETS In thousands of Brazilian reais (R$) 09/30/2026 12/31/2025 CURRENT LIABILITIES Trade accounts payable - domestic market 4,454,549 3,641,918 Trade accounts payable - debtor risk 384,289 381,415 Trade accounts payable -imports 1,718,612 986,338 Short-term debt 354,214 897,295 Debentures 200,531 44,609 Taxes payable 429,796 400,293 Income and social contribution taxes payable 147,804 289,862 Payroll and related liabilities 1,033,182 915,508 Leasing payable 510,647 386,472 Employee benefits 586 594 Environmental liabilities 265,960 382,800 Fair value of derivatives 16,147 3,306 Other current liabilities 1,057,602 1,557,010 10,573,919 9,887,420 NON-CURRENT LIABILITIES Long-term debt 8,809,959 8,877,457 Debentures 4,364,522 4,362,790 Deferred income taxes 410,401 353,828 Provision for tax, civil and labor liabilities 2,413,087 2,292,412 Environmental liabilities 327,750 237,865 Employee benefits 357,976 404,085 Leasing payable 1,240,544 1,002,689 Other non-current liabilities 599,123 471,140 18,523,362 18,002,266 EQUITY Capital 24,273,225 24,273,225 Capital reserves 11,597 11,597 Treasury stocks (407,333) (520,067) Profit reserves 22,449,653 23,054,501 Retained earnings 3,204,533 - Asset valuation 5,123,345 6,766,137 EQUITY ATTRIBUTABLE TO THE EQUITY HOLDERS OF THE PARENT 54,655,020 53,585,393 NON-CONTROLLING INTERESTS 193,224 213,096 EQUITY 54,848,244 53,798,489 TOTAL LIABILITIES AND EQUITY 83,945,525 81,688,175

Quarterly Results 3Q26 | Gerdau S.A. 22 INCOME STATEMENT GERDAU S.A. CONSOLIDATED STATEMENTS OF INCOME In thousands of Brazilian reais (R$) For the three-month period ended For the nine-month period 09/30/2026 09/30/2025 09/30/2026 09/30/2025 NET SALES 18,690,518 17,983,143 53,276,811 52,884,229 Cost of sales (15,339,568) (15,841,051) (44,802,806) (46,765,037) GROSS PROFIT 3,350,950 2,142,092 8,474,005 6,119,192 Selling expenses (199,595) (196,012) (574,353) (595,331) General and administrative expenses (333,059) (316,376) (997,430) (1,016,839) Other operating income 283,501 36,748 371,013 138,469 Other operating expenses (402,704) (96,497) (498,790) (233,427) Impairment of financial assets (12,981) 50 (58,712) (6,529) Equity in earnings of unconsolidated companies 29,528 88,744 166,223 124,457 INCOME BEFORE FINANCIAL INCOME (EXPENSES) AND TAXES 2,715,640 1,658,749 6,881,956 4,529,992 Financial income 121,807 191,628 360,021 486,476 Financial expenses (476,747) (536,289) (1,372,243) (1,429,577) Buyback of bonds - - - (39,646) Exchange variations, net (70,018) 150,616 (23,851) 184,931 Losses on financial instruments, net (5,701) (28,740) (22,822) (67,596) INCOME BEFORE TAXES 2,284,981 1,435,964 5,823,061 3,664,580 Current (664,936) (153,729) (1,688,933) (776,922) Deferred (56,948) (192,355) (91,630) (175,477) Income and social contribution taxes (721,884) (346,084) (1,780,563) (952,399) NET INCOME 1,563,097 1,089,880 4,042,498 2,712,181 Credit/recovery provisions (60,412) - (60,412) - Income tax of extraordinary items 20,540 - 20,540 - (=) Total of extraordinary items (39,872) - (39,872) - ADJUSTED NET INCOME¹ 1,523,225 1,089,880 4,002,626 2,712,181 1 - Adjusted Net income is a non-accounting measurement prepared by the Company, reconciled with its financial statements, and consists of Net income for the period adjusted for non-recurring events that impacted results.

Quarterly Results 3Q26 | Gerdau S.A. 23 CASH FLOW GERDAU S.A. CONSOLIDATED STATEMENTS OF CASH FLOW In thousands of Brazilian reais (R$) For the three-month period ended For the nine-month period ended 09/30/2026 09/30/2025 09/30/2026 09/30/2025 CASH FLOWS FROM OPERATING ACTIVITIES Net income for the period 1,563,097 1,089,880 4,042,498 2,712,181 Adjustments to reconcile net income for the period to net cash provided by operating activities: Depreciation and amortization 937,901 937,554 2,761,070 2,747,933 Equity in earnings of unconsolidated companies (29,528) (88,744) (166,223) (124,457) Exchange variation, net 70,018 (150,616) 23,851 (184,931) Losses on derivative financial instruments, net 5,701 28,740 22,822 67,596 Post-employment benefits 64,401 71,568 203,076 217,330 Long-term incentive plans 34,062 37,878 109,085 120,110 Income tax 721,884 346,084 1,780,563 952,399 Losses (Gains) on disposal of property, plant and equipment 13,412 (5,270) 27,330 14,990 Gain on remeasurement of previously held equity interest (243,754) - (243,754) - Losses (Gains) from impairment of financial assets 12,981 (50) 58,712 6,529 Provision of tax, civil, labor and environmental liabilities, net 29,328 29,126 120,627 1,756 Interest income on short-term investments (27,310) (46,331) (104,274) (119,024) Interest expense on debt and debentures 288,669 358,369 840,040 931,744 Interest expense on lease liabilities 42,962 31,677 114,330 98,068 Provision (Reversal) for net realizable value adjustment on inventories, net 4,447 9,562 (29,208) 2,108 3,488,271 2,649,427 9,560,545 7,444,332 CHANGES IN ASSETS AND LIABILITIES Increase in trade accounts receivable (226,814) (118,867) (1,500,539) (1,057,770) Decrease (Increase) in inventories (398,392) 496,032 (2,268,903) 162,314 Increase (Decrease) in trade accounts payable 352,854 (72,355) 1,584,649 147,156 Decrease (Increase) in other receivables 23,610 (2,552) 5,143 (13,090) Increase (Decrease) in other payable 91,650 100,926 (82,059) (482,974) Dividends from associates and joint ventures 3,713 2,696 291,579 26,222 Purchases of short-term investments (43,256) 135,403 (140,029) (354,277) Proceeds from maturities and sales of short-term investments 22,296 (98,439) 358,162 523,818 Cash provided by operating activities 3,313,932 3,092,271 7,808,548 6,395,731 Interest paid on loans and financing (26,156) (75,458) (655,770) (622,744) Interest paid on lease liabilities (42,962) (31,677) (114,330) (98,068) Income and social contribution taxes paid (547,897) (60,088) (1,297,208) (834,539) Net cash provided by operating activities 2,696,917 2,925,048 5,741,240 4,840,380 CASH FLOWS FROM INVESTING ACTIVITIES Purchases of property, plant and equipment (1,100,775) (1,713,359) (3,333,013) (5,211,509) Proceeds from sales of property, plant and equipment, investments and other Intangibles, net of deconsolidated cash 8,217 35,653 17,755 65,719 Additions in other intangibles (49,333) (49,704) (124,783) (124,092) Payment for acquisition of control of a company, net of cash acquired (300,000) - (300,000) (673,272) Capital increase/Additional acquisition of interest in joint ventures and associates - (2,636) (89) (91,436) Net cash used in investing activities (1,441,891) (1,730,046) (3,740,130) (6,034,590) CASH FLOWS FROM FINANCING ACTIVITIES Purchases of treasury stocks (31,560) (213,318) (342,833) (985,822) Dividends and interest on capital paid (426,216) (248,287) (976,269) (711,686) Proceeds from loans and financing 256,070 758,595 564,276 8,902,761 Repayment of loans and financing (382,761) (282,844) (847,487) (3,190,133) Leasing payments (129,705) (117,438) (374,250) (352,346) Net cash used in financing activities (714,172) (103,292) (1,976,563) 3,662,774 Exchange variation on cash and cash equivalents (194) (203,071) (257,825) (846,805) Increase (Decrease) in cash and cash equivalents 540,660 888,639 (233,278) 1,621,759 Cash and cash equivalents at beginning of year 5,155,232 8,500,933 5,929,170 7,767,813 Cash and cash equivalents at end of the period 5,695,892 9,389,572 5,695,892 9,389,572

Quarterly Results 3Q26 | Gerdau S.A. 24 RESULTS BY BUSINESS SEGMENT GERDAU S.A. INFORMATION BY BUSINESS SEGMENT In thousands of Brazilian reais (R$) Brazil North America South America Eliminations Consolidated 3Q26 RESULTS Shipments (tonnes) 1,351,107 1,312,697 309,349 (58,933) 2,914,220 Net sales 6,948,113 10,512,390 1,439,580 (209,565) 18,690,518 Cost of goods sold (6,508,451) (7,765,719) (1,303,821) 238,423 (15,339,568) Gross Profit 439,662 2,746,671 135,759 28,858 3,350,950 Gross Margin 6.3% 26.1% 9.4% - 17.9% SG&A (244,983) (194,724) (44,804) (48,143) (532,654) Other operating (expenses) revenue (85,797) (63,849) (6,843) 37,286 (119,203) Depreciation and amortization 581,505 280,635 75,761 - 937,901 Proportional EBITDA from operations with jointly controlled entities 51,035 142,559 - - 193,594 Credit recovery / provisions - - - (60,412) (60,412) Adjusted EBITDA 741,422 2,911,292 159,873 (42,411) 3,770,176 Adjusted EBITDA Margin 10.7% 27.7% 11.1% - 20.2% EBITDA/tonelada - R$/ton 549 2,218 517 - 1,294 Brazil North America South America Eliminations Consolidated 2Q26 RESULTS Shipments (tonnes) 1,351,937 1,346,828 282,010 (72,866) 2,907,909 Net sales 6,685,729 10,126,084 1,279,042 (220,223) 17,870,632 Cost of goods sold (6,356,498) (7,797,952) (1,107,970) 220,976 (15,041,444) Gross Profit 329,231 2,328,132 171,072 753 2,829,188 Gross Margin 4.9% 23.0% 13.4% - 15.8% SG&A (221,426) (181,357) (42,610) (71,861) (517,254) Other operating (expenses) revenue (24,758) 14,719 1,925 (8,773) (16,887) Depreciation and amortization 573,601 272,643 74,531 - 920,775 Proportional EBITDA from operations with jointly controlled entities 48,323 165,700 - - 214,023 Adjusted EBITDA 704,971 2,599,837 204,918 (79,881) 3,429,845 Adjusted EBITDA Margin 10.5% 25.7% 16.0% - 19.2% EBITDA/tonelada - R$/ton 521 1,930 727 - 1,179 Brazil North America South America Eliminations Consolidated 3Q25 RESULTS Shipments (tonnes) 1,582,130 1,293,232 288,727 (77,018) 3,087,071 Net sales 7,696,303 9,184,613 1,376,294 (274,067) 17,983,143 Cost of goods sold (7,293,943) (7,642,618) (1,180,402) 275,912 (15,841,051) Gross Profit 402,360 1,541,995 195,892 1,845 2,142,092 Gross Margin 5.2% 16.8% 14.2% - 11.9% Selling, general and administrative expenses (245,203) (186,252) (36,939) (43,994) (512,388) Other operating (expenses) revenue (25,556) (3,198) 6,717 (37,712) (59,749) Depreciation and amortization 556,271 312,545 68,738 - 937,554 Proportional EBITDA from operations with jointly controlled entities 74,492 154,857 - - 229,349 Adjusted EBITDA 762,364 1,819,947 234,408 (79,861) 2,736,858 Adjusted EBITDA Margin 9.9% 19.8% 17.0% - 15.2% EBITDA/tonne - R$/ton 482 1,407 812 - 887

Quarterly Results 3Q26 | Gerdau S.A. 25 Brazil North America South America Eliminations Consolidated RESULTS 9M26 Shipments (tonnes) 4,027,436 3,935,738 897,082 (227,154) 8,633,101 Net sales 19,904,949 29,987,948 4,114,625 (730,711) 53,276,811 Cost of goods sold (18,918,013) (22,993,207) (3,653,041) 761,455 (44,802,806) Gross Profit 986,936 6,994,741 461,584 30,744 8,474,005 Gross Margin 5.0% 23.3% 11.2% - 15.9% SG&A (688,882) (563,956) (129,866) (189,079) (1,571,783) Other operating (expenses) revenue (126,808) (37,888) (2,108) 39,027 (127,777) Depreciation and amortization 1,705,409 834,886 220,775 - 2,761,070 Proportional EBITDA from operations with jointly controlled entities 147,463 535,492 - - 682,955 Credit recovery / provisions - - - (60,412) (60,412) Adjusted EBITDA 2,024,118 7,763,275 550,385 (179,720) 10,158,058 Adjusted EBITDA Margin 10.2% 25.9% 13.4% - 19.1% EBITDA/tonne - R$/ton 503 1,973 614 - 1,177 Brasil North America South America Eliminations Consolidated RESULTS 9M25 Shipments (tonnes) 4,369,715 3,777,782 814,055 (192,789) 8,768,763 Net sales 22,507,124 27,091,832 4,072,991 (787,718) 52,884,229 Cost of goods sold (20,787,357) (23,160,319) (3,605,230) 787,869 (46,765,037) Gross Profit 1,719,767 3,931,513 467,761 151 6,119,192 Gross Margin 7.6% 14.5% 11.5% - 11.6% SG&A (726,009) (603,159) (124,298) (158,704) (1,612,170) Other operating (expenses) revenue (32,832) 28,065 11,947 (102,138) (94,958) Depreciation and amortization 1,591,554 939,785 216,594 - 2,747,933 Proportional EBITDA from operations with jointly controlled entities 183,117 356,760 - - 539,877 Adjusted EBITDA 2,735,597 4,652,964 572,004 (260,691) 7,699,874 Adjusted EBITDA Margin 12.2% 17.2% 14.0% - 14.6% EBITDA/tonne - R$/ton 626 1,232 703 - 878

Quarterly Results 3Q26 | Gerdau S.A. 26 WHO WE ARE LARGEST BRAZILIAN STEEL PRODUCER With 125 years of history, Gerdau is Brazil’s largest producer of steel, and a leading supplier of long and special steel globally. In Brazil, Gerdau also produces flat steel and iron ore. Dedicated to empowering individuals who shape the future, the Company is a benchmark for internationalization in the Brazilian industrial sector. It is present in several countries in the Americas and relies on 30,000 employees across all its operations. Gerdau has 28 steel production units, including 13 industrial units in North America. Recognized as the largest recycler in Latin America, Gerdau utilizes scrap as a significant raw material, with nearly 70% of its steel production derived from scrap. Annually, it transforms 10 million tonnes of scrap into a diverse range of steel products. As a result of its sustainable production matrix, Gerdau currently has one of the lowest average greenhouse gas (CO₂e) emissions, accounting for half the global average for the sector. Gerdau shares are listed on the São Paulo (B3) and New York (NYSE) stock exchanges (NYSE). For more information, visit the Investor Relations website: https://ri.gerdau.com/

Rafael Japur Vice President and Investor Relations Officer Mariana Velho Dutra IR Manager Ariana Pereira Renata Albuquerque Arthur Alves Trovo Adriana Costa Adriana Costa Follow Gerdau on Social Media IR CONTACTS Investor Relations website: http://ri.gerdau.com/ IR e-mail: inform@gerdau.com Press e-mail: atendimentogerdau.br@bcw-global.com

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EXHIBIT 99.1 80.8 KB