On 30 August 2026, President Claudia Sheinbaum submitted to the Mexican Senate a bill to amend the Foreign Investment Law (Ley de Inversión Extranjera) and establish a formal national security review mechanism for certain foreign investments in Mexico. The proposal would empower the National Foreign Investment Commission (CNIE for its acronym in Spanish) to review, condition, or prohibit acquisitions involving foreign investors seeking to obtain significant ownership in Mexican companies operating in designated strategic sectors.
Note: It is important to state now that it is a proposal and as such, that the final text needs still to be reviewed and that the complete legislative process (Senate’s Chamber and then Deputies’ Chamber) ought to be followed.
While the proposal follows a global trend whereby governments increasingly scrutinise foreign investments in critical sectors, the initiative raises important questions regarding legal certainty, transparency, regulatory discretion, and Mexico's attractiveness as an investment destination. It also invites consideration of how the proposed framework may interact with fundamental international investment principles such as National Treatment and Most-Favoured-Nation (MFN) Treatment.
Key elements of the proposed reform
Under the proposal, foreign investments involving ownership exceeding 49% of the capital stock of certain Mexican companies may become subject to prior national security review where the investment exceeds thresholds to be determined by the CNIE; the target company operates in sectors classified as sensitive or strategic; and, the transaction falls within categories identified as potentially affecting national security.
The CNIE would be authorised to:
- Approve the transaction;
- Approve the transaction subject to conditions or mitigation measures; or
- Block the acquisition entirely if it determines that national security risks exist.
The reform would also formally incorporate representatives from the Ministry of Defence (SEDENA), Navy (SEMAR), and Ministry of Security and Citizen Protection (SSPC) into the decision-making structure, while the Attorney General's Office (FGR), National Intelligence Centre (CNI), Tax Administration Service (SAT), and Financial Intelligence Unit (UIF) would participate in an advisory capacity.
Scope of strategic sectors
The initiative identifies a broad range of sectors potentially subject to enhanced review, including:
- Energy infrastructure;
- Mining;
- Transportation;
- Telecommunications;
- Data storage and digital systems;
- Health-related infrastructure;
- Aerospace and defense industries;
- Artificial intelligence;
- Cybersecurity;
- Semiconductors;
- Robotics and other critical technologies.
Notably, the proposed list extends beyond traditional defence-related activities and encompasses sectors that are frequently targeted by foreign investors and multinational corporations.
Alignment with international trends
Mexico's proposal resembles investment screening mechanisms already implemented in several jurisdictions. For example: (i) The United States operates the Committee on Foreign Investment in the United States (CFIUS); (ii) The European Union has adopted an FDI screening framework; (iii) The United Kingdom applies the National Security and Investment Act; (iv) Canada and Australia maintain similar review mechanisms.
As a result, the creation of a national security screening regime is not, in itself, unusual or inconsistent with international practice. However, international experience demonstrates that investor confidence is often linked to the clarity of the applicable standards, procedural transparency, and predictability of governmental decision-making.
Potential tension with National Treatment and MFN principles
National Treatment
The principle of National Treatment generally requires foreign investors to be treated no less favourably than domestic investors in like circumstances.
The proposed reform is directed specifically at foreign investment transactions and therefore introduces a review process that domestic acquisitions would not necessarily face. This differential treatment may not automatically violate Mexico's international commitments because investment treaties frequently include exceptions for national security. Nevertheless, the broader and less clearly finally defined the concept of national security becomes, the greater the possibility that foreign investors may perceive the regime as discriminatory in practical effect. Enacted version shall be reviewed on due time.
Most-Favoured-Nation (MFN) Treatment
The MFN principle requires a host state to treat investors from one foreign country no less favourably than investors from another foreign country. Should the CNIE's review process result in inconsistent application among investors from different jurisdictions, concerns could arise regarding compliance with treaty-based MFN obligations. While security-based distinctions may be legally justified, the absence of highly transparent review criteria could increase uncertainty regarding whether similar transactions will receive similar treatment. This is paramount to be reviewed on enacted version.
Accordingly, although national security exceptions likely provide Mexico with considerable legal flexibility, the practical application of the regime will be critical in determining whether investors view the system as objective and rules-based.
The challenge of defining "national security"
Perhaps the most consequential aspect of the proposal is not the existence of a review mechanism itself, but rather the breadth of the concept it seeks to protect. Mexican law contains definitions of national security through the National Security Law (Ley de Seguridad Nacional), including threats such as espionage, terrorism, sabotage, foreign interference, and risks to strategic infrastructure. However, notions such as "strategic infrastructure," "critical technologies," and threats to the stability or permanence of the State inherently require discretionary interpretation.
As drafted, the proposal appears to expand the role of national security analysis into sectors that are fundamentally economic in nature. This raises an important practical consideration, which is that from a purely nationalistic or sovereignty-based perspective, sectors such as mining, energy, telecommunications, transportation infrastructure, and strategic data systems may almost always be characterised as matters of national security.
If that reasoning is adopted broadly, a substantial percentage of major foreign investments could become eligible for heightened scrutiny regardless of whether a genuine security risk exists in the specific transaction.
Consequently, the reform may considerably expand the discretionary authority of governmental bodies to intervene in investment decisions based on policy considerations that extend beyond traditional security concerns.
Potential impact on foreign investment
The reform's ultimate effect on investment flows will depend on how the review process is implemented. On one hand, a transparent and predictable framework could enhance legal certainty by replacing a more generalised governmental power with a structured review process and defined procedures.
On the other hand, investors may perceive additional regulatory review, longer timelines, broader governmental discretion, and uncertain security-related standards as increasing transaction risk and compliance costs.
Particularly in capital-intensive sectors such as those to be impacted by this reform, if enacted, investors typically prioritise predictability regarding approvals, timelines, and regulatory outcomes. A review regime based on concepts that are not fully objective or transparent may therefore create concerns regarding deal certainty; financing risk; transaction timing; valuation adjustments; and long-term investment planning.
In a global environment where jurisdictions compete aggressively for foreign direct investment, increased uncertainty may affect Mexico's relative attractiveness, especially where competing jurisdictions offer similarly attractive investment opportunities with clearer screening standards.
Key takeaways
The proposed amendments represent one of the most significant developments in Mexico's foreign investment framework in recent years. While the initiative aligns Mexico with international trends toward screening investments in strategic sectors, it simultaneously raises important concerns regarding regulatory discretion; transparency of national security determinations; procedural certainty; compatibility with National Treatment and MFN principles under international investment agreements; and Mexico's continued competitiveness as a destination for foreign direct investment.
For investors considering acquisitions in sectors such as energy, mining, infrastructure, telecommunications, data management, and advanced technologies, careful monitoring of the legislative process and the final implementing regulations will be essential.
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