Aluminum Corp of China (ACH, news, chart, volatility) puts are active. The stock is up 7 cents to $9.45 and volume in the options market is running double the usual levels. 4,700 puts have traded so far today, or roughly 5 times the number of call options. Most of the action is in the November 15 and December 5 puts and appears to be due to some rolling of bearish puts from the front month to December. ACH is down nearly 80 percent over the past five months and the 15s, with open interest of 7,692 are deep in-the-money.