Other sources here: https://canadianliberty.com/world-bank-insider-blows-whistle-on-global-power-grab/

Revealed – the capitalist network that runs the world
By Andy Coghlan and Debora MacKenzie, New Scientist | Updated October 24, 2011 | Magazine issue 2835

… When the team further untangled the web of ownership, it found much of it tracked back to a “super-entity” of 147 even more tightly knit companies – all of their ownership was held by other members of the super-entity – that controlled 40 per cent of the total wealth in the network. “In effect, less than 1 per cent of the companies were able to control 40 per cent of the entire network,” says Glattfelder. Most were financial institutions. The top 20 included Barclays Bank, JPMorgan Chase & Co, and The Goldman Sachs Group. …

The actual paper is available online:
The network of global corporate control
By Stefania Vitali, James B. Glattfelder, and Stefano Battiston | arXiv:1107.5728v2 [q-fin.GN] 19 Sep 2011

… We present the first investigation of the architecture of the international ownership network, along with the computation of the control held by each global player. We find that transnational corporations form a giant bow-tie structure and that a large portion of control flows to a small tightly-knit core of financial institutions. This core can be seen as an economic “super-entity” that raises new important issues both for researchers and policy makers. …

Note: is it worth investigating – via Clint Richardson’s series Corporation Nation – the point about fund managers and how governments are tied to this entity?