AUMN After the merger (2 Sept) the Sentinel Group lost is 19% stake in the new company. So they decided to short the stock.(From the 2 of September to the 7 of October) When they finshed push the price down, they decided to buy 4M shares (7.5$, 30M$ cash), so they can keep 19% in the new company. http://finance.yahoo.com/news/Golden-Minerals-Announces-iw-3193604350.html?x=0 Now they will cover the + 1M shares short and bring the price back up to 12-15$ level. http://www.nasdaq.com/symbol/aumn/short-interest