Russian leader Vladmir Putin was connected to the Panama Papers after the names of some in his tight-knit inner circle, including the godfather of his first child, were implicated.
More than 11 million documents were contained in the leak, investigated by the International Consortium of Investigative Journalists (ICIJ).
Government leaders from Argentina, Iceland, Saudi Arabia, Ukraine, and the United Arab Emirates were among those revealed in the Panama Papers.
Finances were hidden from public scrutiny across the world.
A cartoon from British political cartoonist Christian Adams.
Confidential information on about 210,000 companies listed by Mossack Fonseca was revealed.
"So beautiful is Panama!", "Not so loud!".
World leaders, Hollywood celebrities, and global corporations were among those connected to Panamanian law firm Mossack Fonseca in the leaked documents.
Reporters found some of the shell companies may have been used for illegal purposes, including fraud or tax evasion.
The father of UK Prime Minister David Cameron was found to have run an offshore account through Mossack Fonseca that avoided the country's taxes for thirty years.
The sharks were circling the family of UK PM David Cameron after the leak, with Opposition leader Jeremy Corbyn calling for an investigation into Mr Cameron's family.