6-K

UNITED STATES

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

For the month of May 2026

Commission File Number: 001-14946

Cemex, S.A.B. de C.V.

(Translation of Registrant’s name into English)

Avenida Ricardo Margáin Zozaya #325, Colonia Valle del Campestre

San Pedro Garza García, Nuevo León, 66265 México

(Address of principal executive offices)

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

Form 20-F ☒    Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

Contents

Cemex, S.A.B. de C.V. (“Cemex”) (NYSE: CX) announced today that it signed a 5-year committed, Dollar-denominated $3,000 million syndicated sustainability-linked revolving credit agreement (the “2026 Credit Agreement”), which proceeds will be used for general corporate purposes (including refinancing financial obligations of Cemex and its affiliates). The 2026 Credit Agreement, denominated exclusively in Dollars, maintains interest rate margin and financial covenants, consistent with an investment-grade capital structure, which provide for a maximum ratio of Consolidated Net Debt (as defined below) to Consolidated EBITDA (as defined below) (“Consolidated Leverage Ratio”) of 3.75 times throughout the life of the loan and a minimum ratio of Consolidated EBITDA to interest expense (“Consolidated Coverage Ratio”) of 2.75 times. All tranches under the 2026 Credit Agreement include a margin over SOFR from 85 bps to 137.5 bps, depending on the Credit Rating of Cemex, ranging from BBB+/Baa1 or higher in the lower end to BB+/Ba1 or lower in the higher end. The Secured Overnight Financing Rate (“SOFR”) is a measure of the cost of borrowing cash overnight collateralized by Treasury securities. The contraction “bps” means basis points. One hundred basis points equal 1%.

The 2026 Credit Agreement is guaranteed by Cemex Corp. (the “Guarantor”). Cemex will be able to borrow under the 2026 Credit Agreement once certain conditions are met, which Cemex currently expects to meet in the short-term, possibly as early as before June 30, 2026.

The 2026 Credit Agreement contains ongoing representations, warranties, affirmative and negative covenants, including financial covenants. Under the 2026 Credit Agreement, at the end of each quarter for each period of four consecutive quarters, Cemex must comply with a maximum Consolidated Leverage Ratio of 3.75 times and a minimum Consolidated Coverage Ratio of 2.75 times throughout the life of the agreement. These financial ratios are calculated using the consolidated amounts under IFRS. Under the 2026 Credit Agreement, (i) the Consolidated Leverage Ratio is calculated by dividing “Consolidated Net Debt” by “Consolidated EBITDA” for the last twelve months as of the calculation date. Consolidated Net Debt equals debt, as reported in the statement of financial position, net of cash and cash equivalents, excluding any existing or future obligations under any securitization program and any subordinated notes of Cemex adjusted for net mark-to-market of all derivative instruments, as applicable, among other adjustments including in relation for business acquisitions or disposals; (ii)Consolidated EBITDA, represents Operating EBITDA for the last twelve months as of the calculation date, as adjusted for any discontinued EBITDA, and solely for the purpose of calculating the Consolidated Leverage Ratio on a pro forma basis for any material disposition and/or material acquisition; and (iii)Consolidated Coverage Ratio is calculated by dividing Consolidated EBITDA by Consolidated Interest Expense for the last twelve months as of the calculation date. Cemex’s ability to comply with these ratios may be affected by economic conditions, volatility in foreign exchange rates, as well as by overall conditions in the financial and capital markets or other factors.

Except as the context otherwise may require, references in this press release to “we,” “us,” “our,” or similarexpressions refer to Cemex, S.A.B. de C.V. (“Cemex”) (NYSE: CX; BMV: CEMEX.CPO) and its consolidated entities. The information disclosed in this press release and the current or future events referenced therein may containforward-looking statements within the meaning of applicable securities laws and regulations, including but not limited to Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, asamended. We intend these forward-looking statements to be covered by the “safe harbor” provisions for forward-looking statements within the meaning of applicable securities laws and regulations in all jurisdictions where such provisionsexist, including but not limited to the US Private Securities Litigation Reform Act of 1995. These forward-looking statements and information are necessarily subject to risks, uncertainties, and assumptions, including but not limited to statementsrelated to our plans, objectives, and expectations (financial or otherwise), and typically can be identified by the use of words such as, but not limited to, “will”, “may,” “assume,” “might,”“should,” “could,” “continue,” “would,” “can,” “consider,” “anticipate,” “estimate,” “expect,” “envision,” “plan,”“believe,” “foresee,” “predict,” “potential,” “target,” “goal,” “strategy,” “intend,” “aimed”, or other forward-looking words. Although webelieve that our

expectations are reasonable, we can give no assurance that these expectations will prove to be correct, and actual results, performance and/or achievements may vary, including materially, fromhistorical results, performance and/or achievements or those anticipated by forward-looking statements due to various factors. Unless otherwise indicated, these forward-looking statements reflect our current expectations and projections about thefuture based on certain assumptions and on our knowledge of facts and circumstances as of the date such forward-looking statements are made. These forward-looking statements necessarily involve risks, uncertainties, assumptions and other importantfactors that could cause results and any estimate, projection and/or guidance presented in this press release to differ materially from historical results, performance and/or achievements or those anticipated by forward-looking statements due tovarious factors. Among others, such risks, uncertainties, assumptions, and other important factors that could cause results and any estimate, projection and/or guidance presented in this press release to differ or fail to materialize, or thatotherwise could have an impact on us, include those discussed in our most recent annual report and those detailed from time to time in our other filings with the U.S. Securities and the Exchange Commission (“SEC”), Mexican NationalBanking and Securities Commission (Comisión Nacional Bancaria y de Valores, the “CNBV”) and the Mexican Stock Exchange (Bolsa Mexicana de Valores, the “BMV”), which factors are incorporated herein by reference,including, but not limited to: changes in general economic, political and social conditions, including government shutdowns, new governments or regimes and decisions implemented by such new governments or regimes, changes in laws or regulations inthe countries in which we do business, elections, changes in inflation, interest and foreign exchange rates, employment levels, population growth, any slowdown in the flow of remittances into countries where we operate, consumer confidence and theliquidity of the financial and capital markets in Mexico, the United States of America, the European Union (“EU”), the United Kingdom or other countries in which we operate; the cyclical activity of the construction sector and reducedconstruction activity in our end markets or reduced use in our end markets for our products; our exposure to sectors that impact our and our clients’ businesses, particularly those operating in the commercial and residential constructionsectors, and the public and private infrastructure and energy sectors; volatility in pension plan asset values and liabilities, which may require cash or other contributions to the pension plans; changes in spending levels for residential andcommercial construction and general infrastructure projects; the availability of short-term credit lines or working capital facilities, which can assist us in connection with market cycles; any impact of not maintaining investment grade debt ratingor not obtaining investment grade debt ratings from additional rating agencies on our cost of capital and on the cost of the products and services we purchase; availability of raw materials and related fluctuating prices of raw materials, as well asof goods and services in general, in particular increases in prices of raw materials, goods and services, as a result of inflation, trade barriers, measures imposed by governments or as a result of conflicts between countries that disrupt supplychains; our ability to maintain and expand our distribution network and maintain favorable relationships with third parties who supply us with equipment, services and essential supplies; competition in the markets in which we offer our products andservices; the impact of environmental cleanup costs and other remedial actions, and other environmental, climate and related liabilities relating to existing and/or divested businesses, assets and/or operations; our ability to secure and permitaggregates reserves in strategically located areas in amounts that our operations require to operate or operate in a cost-efficient manner; the timing and amount of federal, state, and local funding for infrastructure; changes in our effective taxrate; our ability to comply with regulations and implement technologies and other initiatives that aim to reduce and/or capture CO2 emissions and comply with related carbon emissions regulations in place in the jurisdictions where we haveoperations; the legal and regulatory environment, including environmental, climate, trade, energy, tax, antitrust, sanctions, export controls, construction, human rights and labor welfare, and acquisition-related rules and regulations in thecountries and regions in which we have operations; the effects of currency fluctuations on our results of operations and financial condition; our ability to satisfy our obligations under our debt agreements, the indentures that govern ouroutstanding notes, and our other debt instruments and financial obligations, and also regarding our subordinated notes with no fixed maturity and other financial obligations; adverse legal or regulatory proceedings or disputes, such as class actionsor enforcement or other proceedings brought by third parties, government and regulatory agencies, including antitrust investigations and claims; our ability to protect our reputation and intellectual property; our ability to consummate asset salesor consummate asset sales in terms favorable to us, fully integrate newly acquired businesses, achieve cost-savings from our cost-reduction initiatives, implement our pricing and commercial initiatives for our products and services, and generallymeet our business strategy’s goals; the increasing reliance on information technology infrastructure for our sales, invoicing, procurement, financial statements, and other processes that can adversely affect our sales and operations in theevent that the infrastructure does not work as intended, experiences technical difficulties, or is subjected to invasion, disruption, or damage caused by circumstances beyond our control, including cyber-attacks, catastrophic events, power outages,natural disasters, computer system or network failures, or other security breaches; the effects of climate change, in particular reflected in weather conditions, including but not limited to excessive rain and snow, shortage of usable water,wildfires and natural disasters, such as earthquakes, hurricanes, tornadoes and floods, that could affect our facilities or the markets in which we offer our products and services or from where we source our raw materials; trade barriers, includingbut not limited to tariffs or import taxes, including those imposed by the United States of America to key markets in which we operate, in particular, Mexico and the EU, and changes in existing trade policies or changes to, or withdrawals from, freetrade agreements, including the United States-Mexico-Canada Agreement (the “USMCA”), and the overall impact that the imposition or threat of trade barriers may cause on the overall economy of the countries in which we do business or thatare part of our global supply chain; availability and cost of trucks, railcars, barges, and ships, terminals, warehouses, as well as their licensed operators, drivers, staff and workers for transport, loading and unloading of our materials or thatare otherwise a part of our supply chain; labor shortages and constraints; our ability to hire, effectively compensate and retain our key personnel and maintain satisfactory labor relations; our ability to detect and prevent money laundering,terrorism financing and corruption, as well as other illegal activities, and how any measures implemented by governments to detect and prevent money laundering, terrorism financing and corruption, and other illegal activities, affect our customers,suppliers and countries in which we do business in general; defaults, losses or disruptions in agreements, financial transactions or operations resulting from sanctions or restrictions imposed on any financial institution, including but not limitedto banks, common representatives, trustees, payment processors, paying agents or other financial intermediaries, or any related parties; terrorist and organized criminal activities, social unrest, as well as geopolitical events, such as global,regional or

national instability, hostilities, war, and armed conflicts, including the current war between Russia and Ukraine, the ongoing war among Israel, the United States and Iran, conflicts in theMiddle East and any insecurity and hostilities in Mexico related to illegal activities or organized crime and any actions any government takes to prevent these illegal activities and organized crime; the impact of pandemics, epidemics, or outbreaksof infectious diseases and the response of governments and other third parties, which could adversely affect, among other matters, the ability of our operating facilities to operate at full or any capacity, supply chains, international operations,availability of liquidity, investor confidence and consumer spending, as well as the availability of, and demand for, our products and services; changes in the economy that affect demand for consumer goods, consequently affecting demand for ourproducts and services; the depth and duration of an economic slowdown or recession, instability in the business landscape and lack of availability of credit; declarations of insolvency or bankruptcy, or becoming subject to similar proceedings;natural disasters and other unforeseen events (including global health hazards such as, for example, COVID-19); and our ability to implement our climate action program in effect at any given time, if any,including our current “Future in Action” climate action and nature program, and to achieve our sustainability goals and objectives in effect at any given time, if any, including under our current “Future in Action” climateaction and nature program. Many factors could cause our expectations, expected results, and/or projections expressed in this press release and in the events referenced herein not being reached and/or not producing the expected benefits and/orresults, as any such benefits or results are subject to uncertainties, costs, performance, and also rate of success and/or implementation of technologies, some of which are yet not proven, among other factors. Should one or more of these risks oruncertainties materialize, or should underlying assumptions prove incorrect, actual results, performance and/or achievements may vary materially from historical results, performance, and/or achievements and/or results; performance and/orachievements expressly or implicitly anticipated by the forward-looking statements; or otherwise could have an impact on us. Forward-looking statements should not be considered guarantees of future performance, and past results or developments arenot indicative of results or developments in subsequent periods. Actual results, performance and/or achievements of our operations and the development of market conditions in which we operate, or other circumstances that may materialize, may differmaterially from those described in, or suggested by, the forward-looking statements contained in this press release, and events referenced therein. Any or all of our forward-looking statements may turn out to be inaccurate and the factors identifiedabove are not exhaustive. Accordingly, undue reliance on forward-looking statements should not be placed, as such forward-looking statements speak only as of the dates on which they are made. The forward-looking statements and the informationdisclosed in this press release are made and stated as of the dates specified in such referenced press release and are subject to change without notice; and, except to the extent legally required, we expressly disclaim any obligation or undertakingto update or correct the information contained in this press release, or revise any forward-looking statements in such referenced press release, whether to reflect new information, the occurrence of anticipated or unanticipated future events orcircumstances, any change in our expectations regarding those forward-looking statements, any change in events, conditions or circumstances on which any such statement is based, or otherwise. Readers should review future reports filed or furnishedby us with the SEC, the CNBV and the BMV. This press release includes certain non-International Financing Reporting Standards (“IFRS”) financial measures that differ from financial informationpresented by us in accordance with IFRS in its financial statements and reports containing financial information. The aforementioned non-IFRS financial measures include “Operating EBITDA”(operating earnings before other expenses, net plus depreciation and amortization) and “Operating EBITDA Margin”. The closest IFRS financial measure to Operating EBITDA is “Operating earnings before other expenses, net”, asOperating EBITDA adds depreciation and amortization to the IFRS financial measure. Our Operating EBITDA Margin is calculated by dividing our Operating EBITDA for the period by our revenues as reported in our financial statements for the same period.We believe there is no close IFRS financial measure to compare Operating EBITDA Margin. These non-IFRS financial measures are designed to complement and should not be considered superior to financial measurescalculated in accordance with IFRS. Although Operating EBITDA and Operating EBITDA Margin are not measures of operating performance, an alternative to cash flows or a measure of financial position under IFRS, Operating EBITDA is the financialmeasure used by our management to review operating performance and profitability, for decision-making purposes and to allocate resources. Moreover, our Operating EBITDA is a measure used by our creditors to review our ability to internally fundcapital expenditures, service or incur debt and comply with financial covenants under our financing agreements. Furthermore, our management regularly reviews our Operating EBITDA Margin by reportable segment and on a consolidated basis as a measureof performance and profitability. These non-IFRS financial measures do not have any standardized meaning and are therefore unlikely to be comparable to similarly titled measures presented by other companies.The financial measures presented in this press release are being provided for informative purposes only and shall not be construed as investment, financial, or other advice. The information, statements, and opinions contained in this press releaseare for informational purposes only and do not constitute a public offer under any applicable legislation, an offer to sell, or solicitation of any offer to buy any securities or financial instruments, or any advice or recommendation with respect tosuch securities or other financial instruments. You should not construe any such information or other material as legal, tax, investment, financial, or other advice. We are not responsible for any third-party information referenced in this pressrelease. Cautionary Statement Regarding Environmental, Social, and Governance (“ESG”) and Sustainability-Related Data, Metrics, and Methodologies. The information disclosed in this press release contains referencesto “green,” “social,” “sustainable,” or equivalent-labelled activities, products, assets, or projects. There is currently no single globally recognized or accepted, consistent, and comparable set of definitions orstandards (legal, regulatory, or otherwise) of, nor widespread cross-market consensus i) as to what constitutes, a ‘green’, ‘social,’ or ‘sustainable’ or having equivalent-labelled activity, product, or asset; orii) as to what precise attributes are required for a particular activity, product, or asset to be defined as ‘green’, ‘social,’ or ‘sustainable’ or such other equivalent label; or iii) as to climate andsustainable funding and financing activities and their classification and reporting. Therefore, there is little certainty, and no assurance or representation is given that such activities, products, assets or projects and/or reporting of thoseactivities, products, assets or projects will meet any present or future expectations or requirements for describing or classifying such activities, products, assets or projects as ‘green,’ ‘social,’ or‘sustainable,’ or attributing similar labels. We expect policies, regulatory requirements, standards, and definitions to be developed and continuously evolve over time.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, Cemex, S.A.B. de C.V. has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.