In 2015, Süddeutsche Zeitung (SZ) was contacted by an anonymous source calling him or herself "John Doe," who offered to leak the documents. Doe did not demand any financial compensation in return, according to the SZ. The total volume of data comes to about 2.76 terabytes, making it the biggest data leak in history. The data pertains to the period spanning from the 1970s to the spring of 2016.
Sri Lankan Finance Minister Ravi Karunanayake said his panel will investigate Sri Lankan names that come up in the Panama Papers, as well as the 46 who appear in the 2013 Offshore Leaks, according to the Daily Mail, since earlier leadership apparently did not do so. The country has many large outstanding foreign loans taken out under the administration of former president Mahinda Rajapakse, and the current government recently had to obtain a US$1.5 billion IMF bailout. Rajapakse has denied diverting funds. The current government came to power in January 2016 on an anti-corruption platform.[382]
Petroleum Minister José Maria Botelho de Vasconcelos had power of attorney for an offshore company in 2002, when he became petroleum minister after previously being employed for a number of years as an executive at Sonangol,[439] according to the leaked documents. He denies wrongdoing.[441] ICIJ partner Le Monde says it has seen documents that show he was the proxyholder for Medea Investments Limited, founded in Niue in 2001, and moved to Samoa five years later. The company, which issued only bearer bonds, had a capitalization of $1 million, and closed in 2009.[439] He has never previously been accused of corruption.[442]

In November 1903 Panama proclaimed its independence[25] and concluded the Hay–Bunau-Varilla Treaty with the United States. The treaty granted rights to the United States "as if it were sovereign" in a zone roughly 16 km (10 mi) wide and 80 km (50 mi) long. In that zone, the US would build a canal, then administer, fortify, and defend it "in perpetuity".
Rami Makhlouf, a maternal cousin of Bashar Al-Assad, was worth an estimated $5 billion before the Syrian Civil War, and had control of 60% of the economy. He was subject to sanctions by the United States and the European Union, and controlled Syria's oil and telecommunications business.[383] The US Treasury charged that Pangates, a company registered to him, supplied the Assad government with a thousand tonnes of aviation fuel.[384] However, the Makhloufs were able to continue to operate via Panama shell companies,[103] registered in the British Virgin Islands, and so not subject to US law – however, on May 9, 2011, the EU issued its own sanctions, and these were extended by an order in council to the British Virgin Islands in July 2011.[385] Mossack Fonseca decided September 6 to resign from Makhlouf's companies. By then, Makhlouf had already cut ties with his bank. HSBC told the law firm that the Swiss authorities had frozen Makhlouf's accounts, and that "they have had no contact with the beneficial owner of this company since the last 3 months".[385]

"This is a unique opportunity to test the effectiveness of leaktivism", said Micah White, co-founder of Occupy, "... the Panama Papers are being dissected via an unprecedented collaboration between hundreds of highly credible international journalists who have been working secretly for a year. This is the global professionalization of leaktivism. The days of WikiLeaks amateurism are over."[79]