ICIJ and the Global Alliance for Tax Justice among nominees that also include Committee to Protect Journalists, Russian dissident Alexei Navalny and climate activist Greta Thunberg.
Zambia will now try to estimate how much revenue was lost under its tax treaty with Mauritius, which one official described as "not balanced or fair."
One of West Africa’s largest economies has torn up its agreement with Mauritius as debate rages over the tax haven’s impact on developing countries.
Within hours of the publication of the ICIJ investigation, officials from the island tax haven huddled to respond to the exposé of its offshore sector.