(Translation of Registrant's name into English)

Ternium S.A.
26 Boulevard Royal – 4th floor

(Address of principal executive offices)

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

Form 20-F a Form 40-F __

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12G3-2(b) under the Securities Exchange Act of 1934.

Yes __ No a

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):

The attached material is being furnished to the Securities and Exchange Commission pursuant to Rule 13a-16 and Form 6-K under the Securities Exchange Act of 1934, as amended.

This report contains Ternium S.A.’s consolidated financial statements as of March 31, 2026.

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.

TERNIUM S.A.

            

Dated: May 5, 2026

(a) See footnote (2) in Consolidated Condensed Interim Statements of Cash Flows.

(1) The Company has an authorized share capital of a single class of 3.5 billion shares having a nominal value of $ 1.00 per share. As of March 31, 2026, there were 2,004,743,442 shares issued. All issued shares are fully paid. Also, as of March 31, 2026, the Company held 41,666,666 shares as treasury shares.

(5) See note 15 (iii).

(6) See note 16 (i).

(1) The Company has an authorized share capital of a single class of 3.5 billion shares having a nominal value of $ 1.00 per share. As of March 31, 2025, there were 2,004,743,442 shares issued. All issued shares are fully paid. Also, as of March 31, 2025, the Company held 41,666,666 shares as treasury shares.

(1) The working capital is impacted by non-cash movements of $ 24.9 million as of March 31, 2026 ($ 115.9 million as of March 31, 2025) due to the variations in the exchange rates used by subsidiaries.

(2) It includes mainly $ 300 million from the syndicated loan of Ternium Mexico in connection with the investment plan in the Pesquería facilities.

(3) It includes restricted cash of $ 3,042 and $ 2,966 as of March 31, 2026 and 2025, respectively. In addition, the Company had other investments with a maturity of more than three months for $ 1,524,962 and $ 1,924,393 as of March 31, 2026 and 2025, respectively.

1.GENERAL INFORMATION AND BASIS OF PRESENTATION

Ternium S.A. (the “Company” or “Ternium”), was incorporated on December 22, 2003 to hold investments in flat and long steel manufacturing and distributing companies. The Company has an authorized share capital of a single class of 3.5 billion shares having a nominal value of $ 1.00 per share. As of March 31, 2026, there were 2,004,743,442 shares issued. All issued shares are fully paid.

Ternium’s American Depositary Shares (“ADS”), each representing 10 shares, trade on the New York Stock Exchange under the symbol “TX”. 

The name and percentage of ownership of subsidiaries that have been included in consolidation in these Consolidated Condensed Interim Financial Statements are disclosed in Note 2 to the audited Consolidated Financial Statements for the year ended December 31, 2025.

The preparation of Consolidated Condensed Interim Financial Statements requires management to make estimates and assumptions that might affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the statement of financial position, and also the reported amounts of revenues and expenses for the reported periods. Actual results may differ from these estimates. The main assumptions and estimates were disclosed in the Consolidated Financial Statements for the year ended December 31, 2025, without significant changes since its publication.

These Consolidated Condensed Interim Financial Statements have been prepared in accordance with IAS 34, “Interim Financial Reporting” and are unaudited. These Consolidated Condensed Interim Financial Statements should be read in conjunction with the audited Consolidated Financial Statements for the year ended December 31, 2025, which have been prepared in accordance with IFRS Accounting Standards (International Financial Reporting Standards) as issued by the International Accounting Standards Board and in conformity with IFRS Accounting Standards as adopted by the European Union (“EU”). Recently issued accounting pronouncements were applied by the Company as from their respective dates.

These Consolidated Condensed Interim Financial Statements have been prepared following the same accounting policies used in the preparation of the audited Consolidated Financial Statements for the year ended December 31, 2025.

None of the accounting pronouncements issued after December 31, 2025, and as of the date of these Consolidated Condensed Interim Financial Statements have a material effect on the Company’s financial condition or result or operations.

The Company is organized in two operating segments: Steel and Mining.

The Steel segment includes the sales of steel products done by the Company's subsidiaries, which comprises mainly slabs, heavy plates, hot and cold rolled products, coated products, stamped steel parts for the automotive industry, roll-formed and tubular products, billets, bars and other products, including sales of energy.

The Mining segment includes the sales of mining products done by the Company's subsidiaries, mainly iron ore and iron ore pellets, and comprises the mining activities of Las Encinas, an iron ore mining company in which Ternium holds a 100% equity interest, the 50% of the operations and results performed by Peña Colorada, another iron ore mining company in which Ternium maintains that same percentage over its equity interest, and the mining activities of Mineraçao Usiminas, an iron ore mining company in which Usiminas holds a 70% equity interest.

Ternium's Chief Executive Officer ("CEO") functions as the CODM. The various geographic regions operate as an integrated steel producer. The CEO allocates resources and assesses performance of the Steel Segment as an integrated business and does the same with the Mining Segment. The CEO uses "Operating income - Management view" as per the below table as the key performance measure, which differs from operating income determined in accordance with IFRS principally as follows:

• The use of direct cost methodology to value inventories, while under IFRS they are valued at full cost, including absorption of production overheads and depreciation.

• The use of costs based on previously internally defined cost estimates, while, under IFRS, costs are calculated at historical cost (using the FIFO methodology).

• In the case of Usiminas, the use of costs based on the weighted average cost, while, under IFRS, costs are calculated under the FIFO methodology.

• Other differences related to other operating income and expenses.

Information on segment assets is not disclosed as it is not reviewed by the CEO.

The Company had no revenues attributable to the Company’s country of incorporation (Luxembourg) in 2026.

For purposes of reporting geographical information, net sales are allocated based on the customer’s location. Allocation of depreciation and amortization is based on the geographical location of the underlying assets.

(1) See note 16 (ii).

(1) For the three-month period ended March 31, 2026 and 2025, it included $ 316 and $ 330 million related to additions of Property, plant and equipment in Mexico, mainly in connection with the investment plan in the Pesquería facilities.

(1) It includes the investments held in Finma S.A.I.F., Recrotek S.R.L. de C.V., Gas Industrial de Monterrey S.A. de C.V., Modal Terminal de Graneis Ltda., Usiroll – Usiminas Court Tecnologia em Acabamento Superficial Ltda, Codeme Engenharia S.A, Terminal de Cargas Paraopeba Ltda. and Terminal de Cargas Sarzedo Ltda.

Techgen stated as of and for the three-month period ended March 31, 2026, that revenues amounted to $ 118 million ($ 106 million as of March 31, 2025), net profit from continuing operations to $ 13 million ($ 12 million as of March 31, 2025), non-current assets to $ 669 million ($ 676 million as of December 31, 2025), current assets to $ 62 million ($ 92 million as of December 31, 2025), non-current liabilities to $ 348 million ($ 1 million as of December 31, 2025), current liabilities to $ 35 million ($ 431 million as of December 31, 2025) and shareholders’ equity to $ 348 million ($ 336 million as of December 31, 2025).

Unigal stated as of and for the three-month period ended March 31, 2026, that revenues amounted to $ 17 million ($ 15 million for the three-month period ended March 31, 2025), net profit from continuing operations to $ 6 million ($ 4 million for the three-month period ended March 31, 2025), non-current assets to $ 139 million ($ 140 million as of December 31, 2025), current assets to $ 47 million ($ 37 million as of December 31, 2025), non-current liabilities to $ 43 million ($ 43 million as of December 31, 2025), current liabilities to $ 12 million ($ 10 million as of December 31, 2025) and shareholders’ equity to $ 131 million ($ 125 million as of December 31, 2025).

MRS Logística stated as of and for the three-month period ended March 31, 2026, that revenues amounted to $ 318 million ($ 181 million for the three-month period ended March 31, 2025), net profit from continuing operations to $ 14 million ($ 32 million for the three-month period ended March 31, 2025), non-current assets to $ 3,806 million ($ 3,516 million as of December 31, 2025), current assets to $ 1,140 million ($ 1,008 million as of December 31, 2025), non-current liabilities to $ 2,653 million ($ 2,297 million as of December 31, 2025), current liabilities to $ 621 million ($ 588 million as of December 31, 2025) and shareholders’ equity to $ 1,672 million ($ 1,639 million as of December 31, 2025).

Upon approval of the Company´s 2025 annual accounts, the Board of Directors intended to propose, for the approval of the Annual General Shareholders' meeting to be held on May 12, 2026, the payment of an annual dividend of $ 0.27 per share ($ 2.70 per ADS), or approximately $ 530 million, which includes the interim dividend of $ 0.09 per outstanding share ($ 0.90 per ADS) or approximately $ 177 million, paid on November 12, 2025. If this annual dividend was approved by the shareholders, a dividend of $ 0.18 per share ($ 1.80 per ADS), or approximately $ 353 million would be paid on May 15, 2026, with an ex-dividend date of May 14, 2026.

On April 15, 2026, the Board of Directors has revised its dividend proposal for fiscal year 2025, lowering the recommended payout to $ 0.22 per share ($ 2.20 per ADS), or $432 million.

Although the Company expects further improvements in its financial performance for the second quarter, the Board of Directors has determined that implementing measures to reinforce the company’s balance sheet is a prudent course of action in the current environment. This decision reflects caution amid ongoing uncertainties regarding the potential impact in the global economy of the conflict in the Middle East.

If the annual dividend is approved by the shareholders, a dividend of $ 0.13 per share ($ 1.30 per ADS), or approximately $ 255 million, will be paid on May 15, 2026, with an ex-dividend date on May 14, 2026. These Consolidated Condensed Interim Financial Statements do not reflect this dividend payable.

The Company is within the scope of the OECD Pillar Two model rules. Pillar Two legislation was enacted in Luxembourg, the jurisdiction in which the company is incorporated, and came into effect from 1 January 2024. The Company applies the exception to recognizing and disclosing information about deferred tax assets and liabilities related to Pillar Two income taxes, as provided in the amendments to IAS 12 issued in May 2023.

The Company estimates as current tax expense related to Pillar Two the amount of $ 1.5 million for the three-month period ended March 31, 2026. The total provision related to Pillar Two as of March 31, 2026, amounts to $ 46.8 million.

Contingencies, commitments and restrictions on the distributions of profits should be read in Note 25 to the Company’s audited Consolidated Financial Statements for the year ended December 31, 2025. As of March 31, 2026, Management reviewed with the assistance of legal counsel the status of each significant matter and assessed the potential financial exposure.

The Company is party to a longstanding lawsuit filed in Brazil by Companhia Siderúrgica Nacional, or CSN, and various entities affiliated with CSN against Ternium Investments, its subsidiary Ternium Argentina, and Tenaris’s subsidiary Confab, all of which compose the T/T Group under the Usiminas shareholders agreement. The entities named in the CSN lawsuit had acquired participations in Usiminas in January 2012. The CSN lawsuit alleges that, under applicable Brazilian laws and rules, the acquirers were required to launch a tag-along tender offer to all non-controlling holders of Usiminas ordinary shares for a price per share equal to 80% of the price per share paid in such acquisition, or BRL 28.8, and seeks an order to compel the acquirers to launch an offer at that price plus interest. If so ordered, the offer would need to be made to 182,609,851 ordinary shares of Usiminas not belonging to the Usiminas control group. Ternium Investments and Ternium Argentina’s respective shares in the offer would be 60.6% and 21.5%.

On September 23, 2013, the first instance court dismissed the CSN lawsuit, and on February 8, 2017, the court of appeals maintained the understanding of the first instance court. CSN filed an appeal to the Superior Court of Justice (SCJ), seeking the review and reversal of the decision issued by the Court of Appeals, and on March 7, 2023, the SCJ, by majority vote, rejected CSN’s appeal.

CSN made several submissions in connection with the SCJ decision, including a motion for clarification that challenged the merits of the SCJ decision. Decisions at the SCJ are adopted by majority vote. At an October 17, 2023 session, two justices of the SCJ voted in favor of remanding the case to the first instance for it to be retried following production and assessment of the new evidence, and two justices of the SCJ voted, without requiring any further evidence, in favor of granting CSN’s motion for clarification and reversing the March 7, 2023 decision that rejected CSN’s appeal; because the fifth member of SCJ excused himself from voting, a justice from another panel at the SCJ was summoned to produce the tie-breaking vote. On June 18, 2024, the SCJ completed its voting on CSN’s motion for clarification and reversed, by majority vote, its March 7, 2023 decision, and resolved that Ternium Investments, its subsidiary Ternium Argentina and Tenaris’s subsidiary Confab should pay CSN an indemnification in connection with the acquisition by the T/T Group of the participations in Usiminas in January 2012, with CSN being allowed to retain ownership of the Usiminas ordinary shares it currently owns.

On August 1, 2024, Ternium Investments, Ternium Argentina and the other T/T Group entities filed a motion for clarification against the SCJ decision and, subsequently, CSN filed its reply. On December 6, 2024, the SCJ rejected this motion for clarification, confirming the obligation of the T/T Group entities to pay indemnification in connection with the 2012 acquisition of the participations in Usiminas. Notwithstanding the foregoing, the SCJ unanimously resolved to modify the applicable monetary adjustment mechanism and to cap the applicable attorney’s fees, thereby lowering the aggregate amount that would be payable if CSN ultimately prevails in this claim. Based on such SCJ decision, assuming monetary adjustment through March 31, 2026, and attorney’s fees in the amount of BRL 5 million, the aggregate amount potentially payable by Ternium Investments and Ternium Argentina if CSN finally prevails on its claims would be of approximately BRL 2,217.0 million (BRL 2,143.9 million as of December 31, 2025) and BRL 784.8 million (BRL 759.0 million as of December 31, 2025). The foregoing amounts, if the BRL/$ rate as of March 31, 2026, is used, are equivalent to approximately $ 424.8 million ($ 389.6 million as of December 31, 2025, if the BRL/$ rate as of such date is used) and $ 150.3 million ($ 138.0 million as of December 31, 2025, if the BRL/$ rate as of such date is used).

The Company continues to believe that all of CSN's claims and allegations are unsupported and without merit, as confirmed by several opinions of Brazilian legal counsel, two decisions issued by the Brazilian securities regulator in February 2012 and December 2016, the first and second instance court decisions and the March 7, 2023 SCJ decision referred to above, and that in connection with the Usiminas acquisition the T/T Group was not required either to launch a tender offer or to pay indemnification to CSN. Accordingly, on February 10, 2025, Ternium filed an extraordinary appeal against the SCJ decisions that ordered an indemnification payment, seeking their review and reversal by the Supreme Federal Tribunal. On September 10, 2025, the Vice-President of the SCJ, without examining the merits, denied leave to proceed with the extraordinary appeal as to certain arguments and ruled it inadmissible as to certain others, and on October 2, 2025, Ternium and the other T/T Group entities filed an internal appeal for the special court of the SCJ to reconsider the denial of leave to proceed and a concurrent appeal against the inadmissibility ruling for the Supreme Federal Tribunal to consider admissibility of the extraordinary appeal directly. On November 26, 2025, the first appeal was dismissed by the SCJ special court while the other appeal has not yet been ruled by the Supreme Federal Tribunal. The Company cannot predict the ultimate resolution on the matter.

In August 2024, the Federal Government had filed two new tax claims for a total of approximately BRL 503 million ($ 92 million; BRL 573 million or $ 110 million as of March 31, 2026). The contingencies are related to tax assessments that partially approved offset statements through which Usiminas claimed PIS and COFINS credits arising from a final court decision, which discussed the exclusion of ICMS from the calculation basis of said contributions. The tax authority disagreed with the calculation methodology adopted by Usiminas. Usiminas filed a defense action in the aforementioned proceedings, arguing that the calculations are correct and the credit rights should be recognized.

Contingencies estimated by Management were related to possible losses arising from administrative proceedings and litigation related to tax, civil and labor matters and based on the advice and assessment of internal and external legal advisors.

The main contingencies recognized in the consolidated condensed interim financial statements pursuant to IFRS 3 Business Combinations in connection with the acquisition of the additional participation in Usiminas and the full consolidation of Usiminas include the following:

(1) Composed of individually non-significative contingencies

(a) Ternium Argentina entered into agreements, mainly with Vale S.A. and LHG Mining, to cover 80% of its required iron ore, pellets and iron ore fines volumes until December 31, 2027, for an estimated total amount of $ 357 million. Although they do not set a minimum amount or a minimum commitment to purchase a fixed volume, under certain circumstances a penalty is established for the party that fails of:

- 7% in case the annual operated volume is between 70% and 75% of the total volume of purchases of the Company; such percentage is applied over the difference between the actual purchased volume and the 80% of the total volume of purchases.

- 15% in case the annual operated volume is lower than 70% of the total volume of purchases of the Company; such percentage is applied over the difference between the actual purchased volume and the 80% of the total volume of purchases.

(b) Ternium Argentina also signed various contracts for the provision and transportation of natural gas, including Tecpetrol and Energy Consulting Services S.A., both related companies of Ternium, assuming firm commitments for a total of $ 38.6 million payable until Abril 2028. Additionally, Ternium Argentina signed contracts for gas transportation with Transportadora de Gas del Norte S.A., a related company of Ternium, assuming firm commitments for a total of $ 165.5 million payable until April 2047.

(c) Ternium Brasil entered into an agreement with Petrobras S.A. for the supply of petcoke. The contract has minimum required volumes and is due to terminate in August 2027. As of March 31, 2026, the outstanding amount of the agreement was approximately $ 143.5 million.

(d) As of March 31, 2026, Usiminas’ commitments for the acquisition of immobilized assets totaled $ 170.4 million and are intended, mainly, for adaptation, reforms, and improvements in the primary areas of Ipatinga, increase in quality, reduction of costs, maintenance, technological updating of equipment and environmental protection.

(e) Usiminas signed in February 2026 a purchase agreement with Petrobras S.A. for the supply of coke to support operations at the company's Ipatinga steel plant until February 2028. The agreement stipulated a total annual volume of 144 thousand tons, subject to a take-or-pay arrangement. The outstanding amount was approximately $ 33.1 million as of March 31, 2026.

As of March 31, 2026, Techint Holdings S.à r.l. (“Techint”) indirectly owned 65.03% of the Company’s share capital and Tenaris Investments S.à r.l. (“Tenaris”) held 11.46% of the Company’s share capital. Each of Techint and Tenaris were controlled by San Faustin S.A., a Luxembourg company (“San Faustin”). Rocca & Partners Stichting Administratiekantoor Aandelen San Faustin (“RP STAK”), a private foundation (Stichting) located in the Netherlands, controls San Faustin through the holding of voting shares sufficient in number to influence matters affecting or submitted to a vote of the shareholders of San Faustin S.A., including the election of directors and the approval of certain corporate transactions and other matters concerning San Faustin S.A.'s policies. No person or group of persons controls RP STAK.

The following transactions were carried out with related parties:

(1) The Company received the full repayment of the loan granted to Techgen S.A. de C.V for $ 150 million.

1)Financial instruments by category

The accounting policies for financial instruments have been applied to the line items below. According to the scope and definitions set out in IFRS 7 and IAS 32, employers’ rights and obligations under employee benefit plans, and non-financial assets and liabilities such as advanced payments and income tax payables, are not included.

2)Fair Value by Hierarchy

IFRS 13 requires for financial instruments that are measured at fair value, a disclosure of fair value measurements by level. See note 29 of the Consolidated Financial Statements as of December 31, 2025 for definitions of levels of fair values and figures at that date.

The following table presents the assets and liabilities that are measured at fair value: