Beneficial Ownership in Mexico: Who Really Owns a Company
Reviewed 1 October 2026.
A compliance officer asked to name the ultimate owner of a Mexican supplier, or a deal lawyer who needs to know who stands behind a target, usually starts by looking for a register. There is none. Mexico keeps no public register of beneficial owners, and the current shareholders of a privately held Mexican corporation appear on no public record. The commercial registry shows who founded the company, the company keeps its own share register, and the information the law requires on ultimate owners goes to the tax authority on request.
Ownership can still be established. The law obliges every company to identify its beneficial controller and keep the file, and obliges notaries to collect the same data when they formalize corporate acts. Every corporate act also leaves deeds and notices that can be reconciled, and reconciling them is how ownership is settled in due diligence in Mexico. The review has to keep apart the shareholders on the register, the individuals who ultimately benefit and the people who actually direct the business, because they are not always the same people.
Mexico keeps beneficial ownership in the company's files, not on a register
The governing rule is in the federal tax code, the Código Fiscal de la Federación (CFF), as amended with effect from 1 January 2022. Article 32-B Ter requires every legal entity, and the trustees, settlors and beneficiaries of every trust, to obtain and keep reliable, complete and current information on its beneficiarios controladores (beneficial controllers) as part of its accounting records, and to produce it to the SAT, the federal tax authority, within 15 business days of a request, extendable by ten more days on a justified request. The article creates no register and opens nothing to the public.
The same amendment added a second filing. Under Article 27, part B, section VI, a company must notify the RFC, the federal taxpayer registry, whenever a partner or shareholder joins or changes, giving each one's name, tax number and percentage of the capital and stating who exercises effective control. The SAT's public RFC tools confirm only that a taxpayer is registered.
The information therefore sits in the company's own file and in the SAT's records, and an outsider can reach the first only by asking the company. In the United States, FinCEN's interim final rule of March 2025 exempted every entity created in the United States from beneficial ownership reporting, and FinCEN made the exemption permanent in August 2026 (FinCEN). The difference is that in Mexico the file must exist, and a counterparty can be asked to produce it.
What the tax code counts as a beneficial controller
Article 32-B Quáter defines the beneficial controller as the individual, or group of individuals, who obtains the benefit of an interest in a legal entity, trust or other arrangement, who ultimately exercises the rights to use, enjoy or dispose of an asset, or in whose name a transaction is made, even contingently. A second limb covers control: the power, through securities, contract or any other act, to impose decisions at shareholders' meetings or appoint or remove most of the directors, to vote more than 15 percent of the capital, or to direct the administration, strategy or main policies. In a trust, the settlor, the trustee, the beneficiaries and anyone else with ultimate effective control are all beneficial controllers.
The working detail is in the SAT's annual rulebook, the Resolución Miscelánea Fiscal para 2026, published in the Diario Oficial de la Federación (DOF), the federal gazette, on 28 December 2025. Rule 2.8.1.20 makes the company apply the tests in order and trace the chain of ownership and the chain of control through intermediate companies and trusts. If no individual emerges, the sole administrator is deemed the beneficial controller, and where there is a board, every member is. The fallback applies only once the tests have been run, so it does not excuse the inquiry. Rule 2.8.1.22 lists 22 items to hold on each controller, from every nationality and the CURP (the population registry code) to the shares held and where the certificates are kept. Changes must be recorded within 15 calendar days (Article 32-B Quinquies).
The 15 percent figure is one control test among several, not a floor. A shareholder below it can still be a beneficial controller through the benefit test, or through another form of control such as the power to appoint most of the directors.
Failing to obtain, keep or produce the information, failing to keep it current, and producing it incomplete or inaccurate are separate infractions (Article 84-M), each fined per beneficial controller under Article 84-N.
The 2025 money-laundering reform reaches notaries, developers and companies
The anti-money-laundering statute, the Ley Federal para la Prevención e Identificación de Operaciones con Recursos de Procedencia Ilícita (LFPIORPI), imposes identification and reporting duties on the actividades vulnerables listed in its Article 17, regulated businesses outside the financial system. A reform published on 16 July 2025, in force the next day, rewrote its definition of beneficiario controlador. The voting test for control now sits at more than 25 percent of the capital, where the 2012 text said more than 50 percent, and the term is declared equivalent to "beneficiario final" and "propietario real" (Article 3, section III). With 15 percent in the tax code and 25 percent here, a file built for one law does not settle the other.
Anyone carrying on a vulnerable activity must identify the client, collect official documents identifying the beneficial controller of a corporate or trust client, and keep the file for at least ten years (Article 18, sections I, III and IV). Real estate developers and brokers are covered (Article 17, section V), and the reform added the receipt of funds for a development built for sale or rent (section V Bis). So are notaries who formalize an incorporation, a capital increase or reduction, a merger or split, or a sale of shares or partnership interests, all reportable whatever the amount (Article 17, section XII, part A, subsection c). A share sale signed before a notary leaves a second file, in the notary's office.
The reform also added a chapter addressed to companies themselves. Every commercial company must answer an authority's request to identify its beneficial controller, file a notice of each transfer of its shares or partnership interests in the electronic system run by the Secretaría de Economía (the economy ministry), and register its beneficial controller information in that system under guidelines the Ministry of Finance issues for the purpose (Articles 33 Bis and 33 Ter). Nothing in the chapter makes that information public.
The rules that apply the statute were amended by Acuerdo 115/2026, published in the DOF on 7 August 2026. The amendments take effect on 30 November 2026, and the new chapter on the beneficial controller applies to acts and transactions from 1 March 2027. A business carrying on a vulnerable activity must then identify a corporate client's beneficial controller in a fixed order: the individuals who directly or indirectly hold 25 percent or more of the capital, then those who control the client by other means, then its most senior manager, and it must document how it did so (Article 23 Quinquies of the rules). A holder of exactly 25 percent is therefore identified under Article 23 Quinquies, although the statute's voting test, and the rules' own definition in Article 3, section IV, require more than 25 percent.
The commercial registry records the founding, not later transfers
Every commercial company must register its incorporation, transformation, merger, split, dissolution and liquidation with the Registro Público de Comercio, the commercial registry (Article 19 of the Código de Comercio). Article 21 lists what enters the company's electronic folio: the incorporation deed, which must name the founders and state the capital (Article 6 of the corporations law), changes of name, domicile, purpose and duration, and increases or reductions of the minimum fixed capital. Powers of attorney appear only as an optional entry. Share transfers are not on the list, and of the capital only changes to the minimum fixed portion are, so the variable capital of a "de C.V." (de capital variable) company can move without touching the folio.
The registry runs on SIGER 2.0, one national database with an electronic folio per company, searchable by folio, company name or partner name through a registered account, though the electronic file is not always complete and older records come from the state office. Our guide on how to verify a Mexican company covers what an entry proves. On ownership, the folio answers one question well: who held the shares on the day the company was formed.
The share register stays inside the company
A sociedad anónima (S.A.), the Mexican corporation, keeps a registro de acciones, its share register, recording each shareholder's name, nationality and domicile, the shares by number, series and class, the payments made on them and every transfer (Article 128 of the Ley General de Sociedades Mercantiles). The company recognizes as owner only the person entered in it. Each transfer entered must be published as a notice in the economy ministry's electronic system, but the ministry must keep the shareholder's name, nationality and domicile in that notice confidential, except from judicial or administrative authorities (Article 129).
A sociedad de responsabilidad limitada (S. de R.L.), the limited liability company, works differently. Its libro especial de los socios, the partners' book, records each partner's name, domicile and contribution, and a transfer has no effect against third parties until it is entered (Article 73). The entry is published in the same system, and Article 73 has no confidentiality clause. Anyone who shows a legitimate interest may inspect the partners' book, which gives a creditor, a litigant or a buyer under a signed letter of intent an argument for access that a stranger to an S.A. lacks. The interest has to be shown, and a buyer should not assume that calling itself interested is enough.
What a public search of the PSM returns
That system is the PSM, the Sistema Electrónico de Publicaciones de Sociedades Mercantiles, at psm.economia.gob.mx, and its public search needs no account. We ran it on 1 October 2026. A search by type of publication covers only the last 30 days, and older notices need a search by date range or keyword. The share-structure category, which holds the notices under Articles 73 and 129, listed 367 notices for that window.
The notices themselves show the two regimes. An S.A.'s notice gave the company's name and RFC (its tax identification number), the date and time of filing, and the name and RFC of the legal representative who filed it. It named no shareholder and gave no holdings. An S. de R.L.'s notice filed the same day carried a table of the partners by name, with the fixed and variable capital attributed to each. For a limited liability company, the current partners can be public. For a corporation, the notice shows only that the company filed and who filed for it, and that name is a lead. Access is rationed: after five downloads in ten minutes, the system refused further requests from the same connection. A notice also shows only what was filed on its date, so later transfers and the company's own books still have to be checked.
Financial statements reach the PSM only by choice. Article 177, as amended in 2014, lets shareholders request publication of the approved statements, with the notes and the report of the comisario (the statutory examiner), rather than requiring it.
The foreign investment register is closed by statute
A Mexican company with foreign shareholders must register with the Registro Nacional de Inversiones Extranjeras (RNIE), the national foreign investment register, within 40 business days of incorporation or of the foreign investor's entry, and a trust over shares or real estate benefiting foreign investors is registered by the trustee (Article 32 of the Ley de Inversión Extranjera). A notary formalizing the company's corporate acts must ask for proof of registration and report its absence (Article 34). The statute calls for an annual renewal through an economic questionnaire (Article 35), but the register's published obligations require the annual economic report only from companies above a threshold set by the National Foreign Investment Commission, so the absence of an annual filing is a breach only for a company above that threshold. Article 31 settles access: the register "no tendrá carácter público", it is not public. A counterparty with declared foreign shareholders can produce its registration certificate, and one that cannot has a gap to explain.
Ownership surfaces in records kept for other purposes
The notarial record is the richest, because a company's incorporation, its bylaw amendments, its mergers and the general powers it grants are formalized before a notary and stay in the notary's protocol. A transfer of S.A. shares need not be. Under rule 2.8.1.23 of the 2026 rulebook, the notary who incorporates a company also keeps the founders' names, the capital, the support for any capital change formalized in that office, the administrators and the registry details. That file answers to the SAT, but the deeds behind it can be obtained from the parties, and registered acts as certified copies.
Litigation is the second source. When shareholders fall out over a meeting, a transfer or a dividend, the docket names the parties (see litigation search in Mexico), and a public judgment, where one has been issued, may describe registers, minutes and transfer documents the company would never volunteer. A suit between a founder and the company is often the first sign that the register in the data room is contested.
Property is the third. Real estate held by the company or its principals is recorded in the state property registry, and most registries index by parcel rather than by owner (see checking property title in Mexico). In the restricted zone, the strip 100 kilometers deep along the borders and 50 along the coast, foreigners typically hold through a fideicomiso, a bank trust that needs a permit from the foreign ministry (Articles 2 and 11 of the foreign investment law), so the bank appears as owner and the beneficiary only in the trust deed. The same records drive asset tracing in Mexico when the question is what a principal owns.
How ownership is established in practice
Start with the acta constitutiva, the incorporation deed, and read forward through every later deed, using the registry folio's list of deed numbers and notaries. Later deeds often cite earlier meetings by date, and a meeting cited but never registered is a document to request.
Reconcile the capital. Build a table from incorporation to date of fixed and variable capital, shares by series, who subscribed each increase and whether it was paid. The register, the minutes and the financial statements must agree on the shares outstanding. Control often changes hands quietly, through an increase subscribed by a newcomer or a variable-capital contribution that appears in the accounts and in no minutes.
Read the powers of attorney, which show who runs the company. A general power for actos de dominio, acts of ownership such as selling assets, held by someone who is neither shareholder nor director is among the most telling documents in a file. Advisers and senior employees also hold broad powers for ordinary reasons, so a power raises the question of control without answering it. Irrevocable powers for acts of administration or ownership are always reportable by the notary under the money-laundering law (Article 17, section XII, part A, subsection b).
Ask for the documents. In a transaction, request:
The incorporation deed, the current bylaws and every later deed.
The share register or partners' book, with the transfer documents and the share certificates.
The minutes and subscription documents for every capital increase or reduction.
Any agreement or power that affects voting, appointments or control.
The Article 32-B Ter beneficial controller file and the acknowledgment of the latest Article 27 shareholder notice.
The PSM notice numbers and, with foreign shareholders, the RNIE certificate.
A company with no beneficial controller file is out of compliance with the tax code. One that has a file and will not show it to a buyer has made a choice the buyer should weigh, though a refusal is a gap in the evidence, not proof of concealed ownership.
Map the people. Search the registry for every shareholder by name, and look for every director, comisario and attorney-in-fact in other companies' deeds and filings. The same names recurring across unrelated companies, often with the same notary and address, mark a corporate service provider or a family group. Records match on full names with two surnames, so each match needs a second identifier (see background checks in Mexico).
Then go and look. Who gives instructions on site, whose name is on the lease and the utility contract, and whom staff call el dueño, the owner, are facts no register holds. Observation corroborates control, but it does not replace the documents that prove legal ownership. Ownership is established when the deeds, the register, the tax filings and the field agree, and where they disagree the report says which source says what.
What a prestanombres arrangement looks like on paper
A prestanombres, literally a name-lender, holds shares or office for someone else, and the arrangement shows in patterns rather than in any one document. A majority shareholder with no evident means, such as a driver, an employee or a young relative, holds a company with substantial capital and contracts. Shares change hands at nominal value shortly before a large award, from a founder who resigns from the board the same day. A general power for acts of ownership sits with the person the industry already treats as the owner. None of these patterns proves a nominee on its own, and each is a reason to ask for documents.
Ask where the share certificates are. Rule 2.8.1.22 requires the beneficial controller file to record where they are deposited or held, and certificates kept in someone else's safe, or endorsed in blank, describe the position better than the register does. Rule 2.8.1.20 allows a file to name the sole administrator only when the tests identify no individual, so in a company with three individual shareholders such a file is a non-answer and a compliance gap. In a fraud investigation, the nominee is often where the money stops and the inquiry starts.
Why a screening platform's UBO entry is usually stale
A commercial database cannot draw a Mexican private company's ownership from a beneficial ownership filing, because none is public. In our experience the "UBO" field is inferred from the founding shareholders in the incorporation deed or from press coverage, so it shows who owned the company when it was formed, which may be years and several transfers ago. Ask the provider for the source and the date behind the entry, and treat it as a pointer to the deed, not a finding (our due diligence checklist for Mexico explains what screening does well).
What the law allows, and what it closes
There is no single search and no lawful shortcut. The shareholder details in an S.A.'s notice are confidential under Article 129 of the corporations law, the RNIE is not public under Article 31 of the foreign investment law, and the beneficial controller files answer to the SAT. A provider who offers any of them without the company's cooperation is offering data obtained outside the law.
Public records can be used. The 2025 private-sector data protection law, the Ley Federal de Protección de Datos Personales en Posesión de los Particulares, does not require consent for personal data found in fuentes de acceso público (Article 9, section II), databases a law makes publicly consultable, excluding information obtained unlawfully (Article 2, section X). Collecting data deceptively is an infraction (Article 58, section XV), and processing personal data by deception for an undue gain carries six months to five years in prison (Article 63). Calling a company's accountant in a false capacity to obtain the share register is on the wrong side of that line.
Where we come in
Warden Consulting is a corporate investigations and due diligence firm founded in 1995 and based in the World Trade Center in Mexico City, with an office in Auckland. Establishing who owns and controls a Mexican counterparty is a core part of our due diligence work in Mexico. Investigating lawyers and investigators rebuild the deed chain, reconcile the capital, map the people across companies and confirm control on the ground, and the report states what each source shows and where the sources disagree. We do not buy tax, registry or bank data, and we say when a question cannot lawfully be answered. To scope an ownership review, contact our Mexico City office.
Frequently asked questions
Is there a beneficial ownership register in Mexico?
There is no public one. Since 1 January 2022 every company must keep a beneficial controller file and produce it to the SAT on request, and the 2025 money-laundering reform requires companies to register beneficial controller information in an economy ministry system. Neither is open to the public.
Can I look up the shareholders of a Mexican company?
Only in part. The commercial registry shows the founding shareholders in the incorporation deed. The current holders of an S.A. are in the company's share register, and the PSM notice keeps their names confidential. An S. de R.L.'s notice can list its partners, and anyone with a legitimate interest may ask to inspect its partners' book.
What is a beneficiario controlador?
The individual who ultimately benefits from or controls a company, trust or other arrangement. The tax code's control test includes voting rights over more than 15 percent of the capital, and the money-laundering law's more than 25 percent. Where no individual can be identified, the tax rules treat the sole administrator, or each board member, as the beneficial controller.
Does a shareholder below 15 percent fall outside the definition?
No. Voting more than 15 percent of the capital is one control test in the tax code. A shareholder below it can still be a beneficial controller through the benefit test, or through another form of control such as the power to appoint most of the directors.
What does the Registro Público de Comercio show about ownership?
The incorporation deed with the founding shareholders and initial capital, structural changes such as mergers and dissolution, and changes to the minimum fixed capital. It does not record share transfers, and powers of attorney are registered only optionally.
How do I find out who is behind a Mexican company?
Rebuild the chain of deeds from incorporation, reconcile the capital, read the powers of attorney, ask for the beneficial controller file, map the people across other companies, and confirm on site who runs the business. No single record answers the question.
Are Mexican company financial statements public?
Not as a rule for a private company. Since 2014, Article 177 of the corporations law lets shareholders request publication of the approved statements in the PSM rather than requiring it. Expect to obtain them from the company itself.
This article is general information, not legal advice.