Mossack Fonseca built a business on secrecy — one leak destroyed it

Mossack Fonseca was a Panamanian law firm that built a global business creating shell companies and offshore structures for wealthy clients. Founded in 1977 by Jürgen Mossack and joined by Ramón Fonseca in 1986, the firm grew to employ 600 people across 40 offices. An internal memo later revealed that 95% of its work consisted of selling vehicles to avoid taxes. The firm operated in the shadows for nearly four decades.

In April 2016, the German newspaper Süddeutsche Zeitung and the International Consortium of Investigative Journalists published the Panama Papers — 11.5 million leaked documents from Mossack Fonseca's internal systems. The leak implicated more than 140 politicians from over 50 countries in tax evasion schemes, including heads of state. The documents showed how the firm helped clients hide assets, evade taxes, and bypass sanctions.

The fallout was immediate and devastating. Regulators in multiple countries launched investigations. Police raided the firm's offices in Panama, Peru, and El Salvador. Clients fled. Revenue collapsed. The firm struggled to pay employees and continued operating at a loss for nearly two years before announcing its closure in March 2018. The founders faced international arrest warrants and money laundering charges.

Mossack Fonseca's collapse demonstrates the existential risk of a business model built on what society considers illegitimate. The firm did not break Panamanian law, but the leak made its operations visible to the world, and that visibility was fatal. The firm's entire value — its secrecy — was also its single point of failure. When the secrecy vanished, the business had nothing left.