Cemex reports unusual volume in Mexican CPO

Cemex reports unusual trading volumes in its CPO shares in Mexico but states it is unaware of any internal or shareholder actions causing the movements.

Rhea-AI Filing Summary

CEMEX SAB DE CV (CX) reported that it observed unusual movements on September 18, 2026 in the trading volumes of its Mexican-listed CPO security “CEMEX.CPO”. The company stated it is not aware of any causes for these volume changes and considers them to correspond to market conditions.

Cemex also informed the Mexican Stock Exchange, under applicable Mexican securities regulations, that it has no knowledge of transactions in its securities by its shareholders, board members, or senior management that could be related to these unusual volume movements. Cemex indicated that any additional related information identified later will be disclosed no later than the next business day, as required by Mexican law.

Key Figures

Date of unusual trading: September 18, 2026 Security with unusual volume: CEMEX.CPO Disclosure deadline: Next business day

3 metrics

Date of unusual trading September 18, 2026 Date when Cemex observed unusual movements in CEMEX.CPO trading volumes

Security with unusual volume CEMEX.CPO Ticker of Cemex’s CPO security on the Mexican Stock Exchange

Disclosure deadline Next business day Deadline Cemex cites for disclosing any additional related information under Mexican law

Key Terms

CPO, Mexican Stock Exchange, Securities Market Law, General Provisions Applicable to Securities Issuers and Other Market Participants

4 terms

CPO financial

"unusual movements in the volumes of Cemex’s CPO on September 18, 2026"

Mexican Stock Exchange financial

"Cemex informed the Mexican Stock Exchange that it was not aware"

Securities Market Law regulatory

"pursuant to Article 106 of the Securities Market Law"

Securities market law is the set of rules that regulate how financial investments, such as stocks and bonds, are bought and sold. It helps ensure fair treatment for all investors, prevents fraud, and maintains trust in the financial system—similar to traffic laws that keep roads safe and orderly. These laws are essential for creating a transparent and stable environment where people can confidently invest their money.

General Provisions Applicable to Securities Issuers and Other Market Participants regulatory

"As provided by Article 53 of the General Provisions Applicable to Securities Issuers"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did CEMEX SAB DE CV (CX) disclose about unusual trading on September 18, 2026?

Cemex disclosed that on September 18, 2026 there were unusual movements in the trading volumes of its CPO security “CEMEX.CPO” in Mexico. The company stated it is not aware of the causes and believes these movements correspond to market conditions.

Did Cemex (CX) identify any insider or shareholder trades linked to the unusual CPO volume?

Cemex stated it has no knowledge of any transactions by its shareholders, members of its board of directors, or senior management involving Cemex securities that could be related to the unusual CPO volume movements on September 18, 2026.

Which Cemex security experienced unusual trading activity on September 18, 2026?

The unusual trading activity affected the CPO security identified as “CEMEX.CPO” listed on the Mexican Stock Exchange. Cemex reported unusual movements in the volumes of this security during trading on September 18, 2026.

How will Cemex (CX) handle any new information about the unusual trading movements?

Cemex stated that if it later identifies additional information related to the unusual CPO trading movements, it will disclose such information no later than the next business day, in accordance with applicable Mexican securities laws.

Under what legal framework did Cemex make this disclosure about unusual trading activity?

Cemex made this disclosure at the request of the Mexican Stock Exchange, pursuant to Article 106 of the Securities Market Law and Article 50 and Article 53 of the General Provisions Applicable to Securities Issuers and Other Market Participants in Mexico.

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

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Available on EDGAR 09/21/2026 - 06:01 AM Accepted by SEC EDGAR 09/18/2026 - 06:36 PM Learn about SEC filing dates

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 September, 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 office)

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 ☐

Contents

On September 18, 2026, Cemex, S.A.B. de C.V. (NYSE: CX) (“Cemex”) informed the Mexican Stock Exchange (Bolsa Mexicana de Valores) that Cemex was not aware of the causes that may have initiated the unusual movements presented during September 18, 2026, in the volumes of the security identified with ticker symbol “CEMEX.CPO”, and that these movements correspond to market conditions. As provided by Article 53 of the General Provisions Applicable to Securities Issuers and Other Market Participants (Disposiciones de Carácter General Aplicables a las Emisoras de Valores y a Otros Participantes del Mercado de Valores) in Mexico, Cemex also informed the Mexican Stock Exchange that it has no knowledge of any of its shareholders, members of its board of directors or its senior management, having executed any transaction with securities issued by Cemex, which could have had any relation with the unusual movements in the volumes of Cemex’s CPO on September 18, 2026. If, subsequently, Cemex identifies any additional information related to these movements, such information will be disclosed no later than the next business day, as required under applicable laws of Mexico. This information is provided in Mexico at the request of the Mexican Stock Exchange, pursuant to Article 106 of the Securities Market Law (Ley del Mercado de Valores) and Article 50, next to last paragraph, of the General Provisions Applicable to Securities Issuers and Other Market Participants.

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.

				Cemex, S.A.B. de C.V.
				(Registrant)
Date: September 18, 2026				By:		/s/ Jaime Martínez Merla
						Name: Jaime Martínez Merla
						Title:  Chief Comptroller