How to Make a Tender Offer in Mexico (2026): CNBV Approvals, 30% Trigger, 20‑day Period

Understanding how to make a tender offer in Mexico requires mastery of a tightly sequenced regulatory process governed by the Ley del Mercado de Valores (LMV) and supervised by the Comisión Nacional Bancaria y de Valores (CNBV). Any acquirer whose stake in a publicly listed Mexican company reaches or crosses the 30 percent ownership threshold must launch a mandatory tender offer (oferta pública de adquisición, or OPA) directed at all remaining shareholders. The offer must remain open for a minimum of 20 business days, shares must be allocated pro rata among accepting holders, and the entire process hinges on a pre‑offer filing with the CNBV that carries its own statutory review window.

This guide walks acquirers, in‑house counsel, intermediaries and listed issuers through every compliance step, from the initial decision point through settlement, under the rules in force in 2026.

Executive Summary: The Core Compliance Decisions

Before committing capital, every potential bidder must resolve three threshold questions. First, will the acquisition result in the bidder holding 30 percent or more of the target’s voting shares? If so, the LMV (Articles 95 and following) mandates a formal tender offer to all remaining shareholders. Second, is the bidder prepared to file with the CNBV in advance, submit the required documentation and wait through the statutory review period before launching? Third, has the bidder structured pricing to comply with the statutory minimum‑price rules and arranged for pro rata allocation in the event of over‑acceptance?

• Mandatory trigger. Crossing or reaching 30 percent of voting shares obliges a public tender offer under the LMV.
• CNBV pre‑filing. A pre‑offer filing with all supporting documents must be submitted to the CNBV before the offer is published.
• 20 business‑day minimum. The offer must stay open for at least 20 business days from the date of publication.
• Pro rata allocation. If acceptances exceed the number of shares sought, the bidder must allocate pro rata among all tendering shareholders.
• Statutory pricing floor. In mandatory offers, the price must meet or exceed the higher of defined statutory benchmarks.

Decision Point: Mandatory vs Voluntary Offers and the 30 Percent Trigger

Statutory Basis for the 30 Percent Trigger

The mandatory tender offer Mexico regime is anchored in Articles 95 through 101 of the LMV. Under Article 98, any person, or group of persons acting in concert, that acquires, directly or indirectly, 30 percent or more of the outstanding voting shares of a listed company must launch a tender offer addressed to all remaining shareholders. The obligation arises regardless of whether the 30 percent threshold is crossed through a single block purchase, a series of market transactions, share conversions or an attribution of shares held by related parties.

Practical Threshold Events

The 30 percent trigger Mexico tender offer rules capture several common deal structures:

• Direct purchase. The bidder contracts to buy a block that, when added to existing holdings, equals or exceeds 30 percent.
• Indirect acquisition. A holding‑company restructuring or merger rolls existing shares into a single vehicle that crosses the threshold.
• Attribution. Shares held by affiliates, concert parties or family members are aggregated under the LMV’s related‑party rules.
• Conversion or exercise. Convertible debt, warrants or options are exercised, pushing the holder past 30 percent.

If the acquirer intends to stay below 30 percent, a voluntary tender offer may still be launched under the general CNBV tender offer rules, but the mandatory‑offer pricing and allocation protections will not apply unless the threshold is crossed.

Step‑by‑Step: How to Make a Tender Offer in Mexico

This section forms the operational core of the process. Each sub‑step follows the sequence that counsel, bidders and intermediaries must execute when effecting a takeover Mexico transaction.

Pre‑Deal Planning

The bidder’s first task is to assemble the deal team. A licensed securities intermediary, known in Mexico as an Institución para el Depósito de Valores or an IFPE (Intermediario del Mercado de Valores), must be appointed to act as the bidder’s agent for filing, publication and settlement. Outside legal counsel with CNBV experience should be engaged simultaneously to draft the offer document and manage the regulatory submission.

Internal governance approvals are equally critical. The bidder’s board of directors (or equivalent governing body) must formally resolve to authorise the tender offer, approve the proposed price and confirm that financing is in place. If the bidder is a foreign entity, apostilled corporate documents, powers of attorney and, where applicable, foreign investment approvals under Mexico’s Ley de Inversión Extranjera should be prepared in parallel.

A communications strategy must also be finalised before any public announcement. Under the LMV, any disclosure of material information about the target must follow the rules on insider trading and relevant events (eventos relevantes). Premature leaks can attract CNBV sanctions and distort the market price on which the offer is based.

CNBV Pre‑Filing and Required Documents

The tender offer requirements Mexico framework starts with a mandatory pre‑offer filing to the CNBV. This filing must be submitted before the offer is published or distributed to shareholders. The purpose is to allow the regulator to review the terms, confirm compliance with the LMV and, where necessary, request amendments or additional information.

The filing package typically includes:

Once the CNBV receives a complete filing, the statutory review clock begins. Industry observers expect the review to take four to eight weeks in straightforward cases, though the CNBV retains the power to extend the period if information is incomplete or if the regulator identifies concerns. Counsel should build this variability into the deal timeline and avoid committing to a firm launch date before receiving CNBV clearance.

Offer Document and Distribution

Upon CNBV clearance, the offer document (folleto informativo) must be published and distributed. Mexican law requires publication of a summary announcement in at least one national‑circulation newspaper. The full offer document must be made available to shareholders through the BMV’s electronic disclosure system (Emisnet), the intermediary’s offices and any other channel specified by the CNBV.

If the bidder is a foreign entity, the offer document must be in Spanish. Where the bidder also needs to comply with securities laws in its home jurisdiction, a parallel offer document in another language may be prepared, but the Spanish‑language version filed with the CNBV controls for legal purposes.

Pricing Strategy and Regulatory Pricing Rules

For mandatory offers triggered by the 30 percent threshold, the LMV prescribes a statutory pricing floor. The offer price per share must be at least the higher of: (a) the volume‑weighted average price on the BMV over a specified look‑back period, and (b) the book value per share as disclosed in the target’s most recent audited financial statements. The CNBV’s implementing regulations detail the precise look‑back windows and calculation methodology.

Voluntary offers are not subject to the same mandatory price floor, although the bidder must still disclose the pricing methodology and the CNBV may scrutinise the fairness of the terms. In all cases, the price must be stated in Mexican pesos, applied equally to all accepting shareholders and remain fixed (or subject only to upward revision) during the acceptance period.

Acceptance Window: The 20 Business Day Tender Offer Mexico Rule

Under the LMV and CNBV regulations, every tender offer, whether mandatory or voluntary, must remain open for a minimum of 20 business days from the date of publication. This 20 business day tender offer Mexico requirement gives shareholders adequate time to evaluate the terms, obtain independent advice and decide whether to tender.

The bidder may extend the acceptance period voluntarily or as required by the CNBV. Any extension must be publicly announced and the revised closing date filed with the BMV. If a competing offer is launched during the acceptance window, the original bidder may match or improve its terms and extend the period accordingly. Shareholders who have already tendered may withdraw their acceptances at any point before the offer closes.

Closing Mechanics and Settlement

Once the acceptance period expires, the intermediary compiles a final list of tendering shareholders and calculates the pro rata allocation (discussed below). Payment is made through Mexico’s central securities depository, Indeval, and the corresponding share transfers are registered simultaneously. Settlement typically occurs within two business days of the offer closing date. The bidder must publish the results of the offer, including the total number of shares acquired and the final allocation ratios, through the BMV’s Emisnet platform.

CNBV Approvals, Timelines and Practical Review Expectations

The CNBV’s review is the single most variable element in the tender offer timeline. Understanding CNBV tender offer rules at the procedural level is essential for realistic deal planning.

Deal teams should note that the CNBV may impose conditions on the offer, such as requiring additional disclosures or amendments to pricing, as a prerequisite to clearance. Early engagement with the regulator, ideally through a pre‑submission consultation, can materially reduce the risk of surprises during the formal review.

Pricing Rules, Valuation Floor and Treatment in Mandatory Tender Offers

The pricing regime for mandatory tender offers in Mexico is designed to protect minority shareholders from being squeezed out at below‑market or below‑book values. The LMV establishes a dual‑benchmark floor: the offer price must equal or exceed both the market reference price (typically a volume‑weighted average over a specified trading window) and the net book value per share.

Where the bidder has purchased shares in private transactions in the period preceding the offer, the price paid in those transactions may also set a floor, preventing the acquirer from paying a premium to a controlling block holder and then offering a lower price to the public. The CNBV retains discretionary authority to require adjustments to the price if it determines that market conditions or recent transactions warrant a higher floor.

For voluntary offers that do not cross the 30 percent trigger, the bidder has greater flexibility in setting the price. However, the equal‑treatment principle still applies: all shareholders who tender must receive the same price per share, and the price cannot be reduced during the acceptance period (though it may be increased).

Allocation Mechanics: Pro Rata Allocation, Proration and Rounding

If the number of shares tendered exceeds the number the bidder seeks to purchase, the pro rata allocation Mexico tender offer rules require that every tendering shareholder’s acceptance be scaled back proportionally. No preference may be given based on the timing of acceptance; all shareholders are treated equally regardless of when they tendered during the 20 business‑day window.

Fractional shares resulting from proration are rounded down to the nearest whole share. Any residual shares that cannot be allocated due to rounding are returned to the tendering shareholders. The intermediary is responsible for calculating and communicating the final allocation to each shareholder before settlement.

Roles and Obligations: Bidders, IFPEs, Issuers and Boards

Intermediaries (IFPEs)

The appointed securities intermediary carries significant obligations under the CNBV framework. The IFPE must verify the completeness of the offer documentation, ensure proper distribution to shareholders, receive and tabulate tenders, calculate pro rata allocations and execute settlement through Indeval. The IFPE is also responsible for reporting the results to the CNBV and the BMV within the prescribed deadlines.

Issuer Board Duties

The board of directors of the target company must issue a formal opinion on the tender offer, disclosing to shareholders whether it considers the price fair, whether it recommends acceptance and whether any conflicts of interest exist among board members. The board is generally prohibited from taking defensive measures, such as issuing new shares or selling material assets, that would frustrate the offer without shareholder approval. The BMV’s listing rules reinforce these obligations with additional disclosure requirements.

How Target Shareholders and Issuers Should Respond

Shareholders receiving a tender offer should carefully review the board’s opinion, engage independent financial advisers and compare the offer price against relevant market benchmarks and intrinsic valuations. The 20 business‑day acceptance period provides time for this analysis, and shareholders retain the right to withdraw tendered shares at any time before the offer closes.

Issuer management should ensure that all relevant events are disclosed through Emisnet in real time, that the board opinion is published promptly and that no insider trading restrictions are breached during the offer period. Where the target company is itself considering a competing bid or a restructuring alternative, early legal advice from experienced capital markets counsel is essential.

Comparative Note: Mexico Tender Offer Rules vs Selected Jurisdictions

Industry observers note that Mexico’s retention of the 20 business‑day minimum period aligns with the CNBV’s emphasis on minority‑shareholder protection, even as the United States experiments with shortened offer periods for qualifying transactions.

Sources

1. Comisión Nacional Bancaria y de Valores (CNBV)
2. Ley del Mercado de Valores, Cámara de Diputados
3. Diario Oficial de la Federación (DOF)
4. Bolsa Mexicana de Valores (BMV)