Chinese entrepreneur Xiang Guangda - known as “Big Shot” - had a large short position on the LME through his company, Tsingshan Holding Group, the world’s largest nickel and stainless steel producer. It's unclear whether that particular trader received a margin call and if he paid it.

Around the time Peabody was served with a $534 million margin call on its hedging coal futures short, which it funded with a new $150MM unsecured (10%) revolver from Goldman Sachs, one of China's largest banks was also served with a margin call for hundreds of millions of dollars on a nickel short gone terribly bad after the price of Nickel did