Mossack Fonseca
Formerly one of the world's largest offshore legal and corporate-services firms, Mossack Fonseca dissolved after the 2016 Panama Papers disclosure.
Last updated October 17, 2026
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Overview
Mossack Fonseca & Co. was a Panamanian law firm and corporate-services provider specializing in international business structures, offshore company formation, trusts, investor advisory, and related legal services. Founded in Panama in 1977 by German lawyer Jürgen Mossack, the firm expanded in 1986 when Panamanian lawyer and novelist Ramón Fonseca joined it. Swiss lawyer Christoph Zollinger later became a third director. The firm operated within the global offshore-services industry, helping clients establish and administer companies and other legal structures in jurisdictions outside their principal places of business. Its practice areas also included commercial law, intellectual-property protection, and maritime law. The firm developed an international network that included offices in China, Latin America, the United States, Europe, and Switzerland. It also established operations in the British Virgin Islands in 1987 and incorporated more than 100,000 companies there according to reference material. Before its dissolution, it reportedly employed approximately 600 people across 42 countries and had acted for about 300,000 companies. Mossack Fonseca's business was generally conducted with professional intermediaries, including financial institutions, trust companies, law firms, and accounting firms. The firm maintained that it performed customer due diligence, followed know-your-customer and anti-money-laundering requirements, rejected compromised prospective clients, and ended relationships when later reviews or sanctions-list updates created concerns. Critics and investigators, however, alleged that its structures could be used to obscure beneficial ownership, evade taxes, and circumvent sanctions. An internal memorandum disclosed in the Panama Papers characterized most of the firm's work as selling corporate vehicles for tax avoidance, a description that became central to public criticism. The firm became globally prominent in April 2016 after Süddeutsche Zeitung and the International Consortium of Investigative Journalists published reporting based on 11.5 million leaked documents. Known as the Panama Papers, the cache covered records dating from the 1970s through 2015 and described offshore arrangements involving politicians, public officials, businesspeople, celebrities, and other wealthy clients. The reporting implicated at least 140 politicians from more than 50 countries and triggered investigations, office raids, political consequences, and renewed international scrutiny of offshore finance. Mossack Fonseca said the reporting misrepresented its work and argued that intermediaries and other institutions also bore responsibility for identifying unlawful activity. The leak caused severe damage to the firm's reputation and finances. On 14 March 2018, Mossack Fonseca announced that it would close, citing the economic and reputational consequences of the Panama Papers as well as what it described as unusual actions by Panamanian authorities. The firm therefore ceased operating as an active international legal-services brand. Its founders later faced criminal proceedings and investigations in several jurisdictions, including Germany and Panama, concerning alleged money laundering and tax-related offenses. The firm's history remains closely associated with the debate over corporate transparency, beneficial ownership, tax enforcement, and the regulation of offshore financial centers.
History
Jürgen Mossack founded the firm in Panama in 1977. The business emerged during the expansion of international corporate and offshore financial services, offering incorporation, administration, fiduciary arrangements, and legal advice to clients seeking cross-border structures. Ramón Fonseca joined Mossack in 1986, creating the partnership that became widely known as Mossack Fonseca. Christoph Zollinger was later added as a director. The firm expanded its international footprint over subsequent decades. In 1987, Mossack established operations in the British Virgin Islands, where the organization later incorporated more than 100,000 companies. The business also developed offices in China, Latin America, the United States, Europe, and Switzerland. It advised on commercial law, trusts, investor matters, international business structures, intellectual property, and maritime law. The firm also worked with jurisdictions seeking to develop offshore financial centers, including Niue. That arrangement ended after banking restrictions disrupted transfers to the island; client accounts were subsequently moved to American Samoa. By the 2010s, Mossack Fonseca was described as one of the largest providers in the offshore-services industry and, at one point, the fourth-largest provider of offshore financial services. It reportedly acted for approximately 300,000 companies and employed roughly 600 staff in 42 countries before closure. Much of its work was conducted through professional intermediaries. The firm said these intermediaries were regulated and responsible for conducting customer checks, while the firm itself claimed to maintain due-diligence and sanctions-screening procedures. The company's low public profile changed through a series of investigations. In 2014, litigation in Nevada examined alleged links between MF Corporate Services and shell companies connected to Argentine political and business figures. In 2015, Mossack Fonseca was mentioned in a German investigation involving Commerzbank. In January 2016, employees of the Brazilian office were charged in relation to the Petrobras corruption investigation. The firm maintained that the Brazilian office was a franchise rather than an operation controlled directly from Panama. The decisive event was the Panama Papers disclosure. In 2015, an anonymous source supplied 11.5 million confidential files to Süddeutsche Zeitung. The newspaper worked with the International Consortium of Investigative Journalists and other media organizations to analyze the 2.6-terabyte archive. On 3 April 2016, the resulting reporting began appearing publicly. The records, dating from the 1970s to 2015, revealed how offshore entities could be used to conceal ownership and wealth. The reporting implicated at least 140 politicians from more than 50 countries and led to investigations and raids, including at the firm's offices in Panama, Peru, and El Salvador. Mossack Fonseca said the coverage distorted its activities. It argued that it routinely rejected questionable clients and withdrew from engagements when later checks raised concerns. It also emphasized that approximately 90 percent of its clientele consisted of professional clients acting as intermediaries. At the same time, the disclosures produced profound reputational and commercial consequences and intensified international pressure for corporate-transparency reforms. On 14 March 2018, Mossack Fonseca announced that it would close. The firm cited the economic and reputational damage caused by the Panama Papers and what it characterized as unusual conduct by certain Panamanian authorities. The brand consequently became defunct. In 2019, the Panama Papers story was adapted into the film The Laundromat. In 2020, German prosecutors issued international arrest warrants for the two founders. From June 2023, the founders faced trial in Panama over alleged money laundering connected to Operation Car Wash.
- 2023
Founders begin trial in Panama
[1]Jürgen Mossack and Ramón Fonseca faced trial in Panama over alleged money laundering linked to Operation Car Wash.
- 2018
Firm announces closure
[1]Mossack Fonseca announced that it would shut down because of the leak's economic and reputational consequences.
- 2016
Panama Papers published
[1]International media partners published findings from 11.5 million leaked documents concerning offshore structures and clients.
- 2015
Document cache supplied to Süddeutsche Zeitung
[1]An anonymous source provided the newspaper with a large cache of confidential firm records that became the basis of the Panama Papers investigation.
- 1987
British Virgin Islands operation established
[1]The firm expanded into the British Virgin Islands and later incorporated more than 100,000 companies there.
- 1986
Ramón Fonseca joins the firm
[1]Panamanian lawyer Ramón Fonseca joined Mossack, forming the partnership associated with the firm's later name.
- 1977
Firm founded in Panama
[1]Jürgen Mossack established the law firm that later became Mossack Fonseca.
Products and positioning
International offshore legal and corporate-services provider
Corporate services
Offshore company formation
The firm's core offering was the establishment and administration of companies in offshore and international jurisdictions. These structures could be used for cross-border commercial activity, holding assets, investment, and other legal purposes. The service became controversial because the Panama Papers showed how opaque corporate entities could obscure beneficial ownership and facilitate tax evasion or other unlawful conduct.
Legal and fiduciary services
Trust and fiduciary services
Mossack Fonseca provided trust-related and fiduciary services intended to help clients organize assets and legal relationships across jurisdictions. The work formed part of the firm's broader corporate-services practice and was often delivered through professional intermediaries such as banks, trust companies, law firms, and accounting firms.
Legal advisory
International business structures
The firm advised on international corporate structures and related commercial-law matters. Its services included setting up entities, maintaining corporate records, and supporting clients operating across multiple legal systems. These structures were marketed as tools for privacy, investment, and international business, while investigators scrutinized their potential use in concealing assets and ownership.
Advisory services
Investor advisory
Investor advisory was among the firm's stated practice areas. It sat alongside company formation, trust services, and commercial-law work, helping clients and intermediaries consider legal structures for international investments and holdings.
Specialist legal services
Intellectual-property and maritime law
In addition to offshore structuring, the firm offered specialist legal work involving intellectual-property protection and maritime law. These practices broadened its profile beyond incorporation and fiduciary administration, although its public identity remained strongly associated with offshore corporate services.
Controversies
2019
Mossack Fonseca sues Netflix over The Laundromat
Mossack Fonseca filed a lawsuit against Netflix, accusing the streaming company of defamation in its film The Laundromat and seeking to stop its release. According to the article, the suit was filed in US federal court in Connecticut on Oct. 13. The report identifies the film as being based on the scandal linked to the law firm. The article states that the firm sought to prevent the film's release through the legal action.
2016
Panama Papers disclosure
A cache of 11.5 million confidential documents was analyzed by Süddeutsche Zeitung, the International Consortium of Investigative Journalists, and media partners. The resulting reporting described offshore arrangements involving prominent individuals and organizations around the world and led to investigations, office raids, and global scrutiny of the firm.
2016
Petrobras-related allegations
Employees of Mossack Fonseca's Brazilian office were charged in relation to the Petrobras corruption investigation. Authorities alleged that the office helped open offshore companies used in money laundering. The firm disputed direct control over the Brazilian operation and described it as a franchise.
2015
Commerzbank investigation
The firm was implicated in reporting concerning German investigations into alleged money laundering and tax-evasion arrangements involving Commerzbank.
2014
Argentine shell-company litigation
A hedge fund sought information about alleged shell companies used to move money connected to the Argentine government and Lázaro Báez. A Nevada court held that a subpoena directed at Mossack Fonseca was valid after questions arose over the relationship between the Panamanian firm and MF Corporate Services.
Brand decisions
2018
Decision to dissolve the firmStrategyBackground
The Panama Papers caused major reputational and financial damage, while the firm also cited unusual actions by certain Panamanian authorities.
Action taken
Mossack Fonseca announced that it would close its offices and end its operations.
Aftermath
The firm became defunct and its name remained principally associated with the Panama Papers and debates over offshore financial transparency.
Recent events
Mossack Fonseca sues Netflix over The Laundromat[2]
Reported:
Mossack Fonseca filed a lawsuit against Netflix, accusing the streaming company of defamation in its film The Laundromat and seeking to stop its release. The article reports the suit was filed in US federal court in Connecticut on Oct. 13.
Sources4 sources
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