On Tuesday, the 87-year-old tycoon moved the hefty sum from his personal funds into his non-profit group, the Wall Street Journal and Financial Times report. Soros, the 29th richest man in the world with a net worth of more than $25 billion according to Forbes, had reportedly been working on the transfer for several years.

The magnate intends to "leave the vast majority of his wealth to the Open Society Foundations," the chief of the group's strategic communications and public affairs, Laura Silber, said, as quoted by AFP. 

The investment heavyweight set up the Open Society Foundations in 1984. It has since become the target of criticism among the billionaire's other projects.

The charity has been accused of inciting so-called color revolutions to install governments friendly to the US – from the Serbian 'Bulldozer Revolution' in 2000 to the Ukrainian uprising in 2013.

Soros' foundations are said to be the most influential around the globe, as "there is no part of the world that they have not been," according to Darren Walker, president of the Ford Foundation, as cited by the New York Times.