It would appear that as of 27 Aug 18 Christopher Pratt is no longer on the board of directors of Nobel Group (where he was a member of Audit, Investment and Capital Markets, Remuneration and Options, and Risk Committees), and that Noble Group was/is in trouble after posting large losses and facing allegations of financial impropriety.
"Noble Group, once one of the world’s biggest commodity trading houses, characterized him as a disgruntled former junior employee behind a series of reports by Iceberg Research, an anonymous group that began attacking its accounting practices in 2015.
After writing down billions of dollars, including on contract valuations questioned by Iceberg, Noble’s market capitalization stands at $115 million. At its peak in 2011, the company was valued at $11.7 billion. Noble defaulted on its bonds and now faces a do-or-die struggle to keep going with a $3.5 billion debt-for-equity rescue that will hand control to creditors." DealStreetAsia 16Aug18
"SINGAPORE (Reuters) - In May 2017, Paul Brough had just assumed the chairmanship of Noble Group and immediately faced a room full of angry bankers demanding their money back from the struggling commodity trader...
In the 15 months between Brough’s appointment and last week’s deal, Noble dramatically downsized and reported a $4.9 billion loss for 2017, including a $2.1 billion valuation adjustment of its controversial derivatives contracts.
Then in October, it [Noble Group] announced the sale of its most capital-intensive business, oil trading, to Vitol for $1.2 billion. “The first glimmer of hope was when we announced the sale of the oil business,” said Brough, who will step down after the restructured company, focusing on coal and freight trading in Asia, kicks off later this year." Reuters 04 Sep 18