Goldilocks, a major shareholder, has sued Noble group.

https://www.bloombergquint.com/markets/2018/03/20/noble-group-hit-by-lawsuit-from-top-shareholder-as-default-looms

Goldilocks has sued Noble for fraud by fudging its accounts.  Furthermore, S&P has downgraded Noble's rating.

http://www.businesstimes.com.sg/companies-markets/sp-downgrades-noble-rating-to-d