Alpek and Controladora Alpek merger process to be completed on December 9, 2025

Monterrey, N.L., Mexico. November 28, 2025 — Alpek, S.A.B. de C.V. (“Alpek” or “the Company”) and Controladora Alpek, S.A.B. de C.V. (“Controladora Alpek”) today announced that the merger process which was approved at their respective Extraordinary General Shareholders’ Meetings held on November 25, 2025, will be completed on December 9, 2025.

As a result of this transaction, Controladora Alpek will cease to exist, and its shares will be cancelled; Alpek will remain as the surviving company. To this end, effective December 9, 2025 (the “Exchange Date”), the 5,558,536,508 common, registered shares representing Alpek’s capital stock, currently owned by Controladora Alpek, will be transferred to Controladora Alpek’s shareholders, applying an exchange ratio of 0.309933698216403 shares of Alpek for each share of Controladora Alpek (the “Exchange Ratio”). Shares of Controladora Alpek will cease to trade on the Mexican Stock Exchange on the same date.

Shareholders who are not entitled to receive a whole number of Alpek shares will receive the cash equivalent for fractional shares at the market price on the business day immediately preceding the Exchange Date, pursuant to the terms and conditions of their depositary agreements with their respective custodian.

Alpek shareholders will not need to exchange their shares, which will remain valid and in circulation without any modification whatsoever.

For further details on the above-mentioned distribution mechanics, please refer to the announcement posted on the web site of the Mexican Stock Exchange.