Revealed: Meet the oil world’s most secretive operator Inbox x

Next in our Keep it in the Ground investigative series is a story about Schlumberger, a company with a huge £114m investment from the Wellcome Trust. The Gates Foundation Trust also holds a shareholding of more than $3m in the company.

Schlumberger is ubiquitous in fossil fuel operations across the world, has more staff than Google, turns over more than Goldman Sachs, and is worth more than McDonald’s – yet you won’t have heard of it. Meet the oil world’s most secretive operator.

Please help us hold the foundations accountable. Share on Facebook, or retweet @guardian below.

The oil firm that makes $48bn a year – and you’ve probably never even heard of it #keepitintheground http://t.co/9q31bIblQ8

— The Guardian (@guardian) May 18, 2015

Thank you,

Alan Rusbridger, Editor in chief of the Guardian