Regulatory forces in the US and the declining market last month prompted broking house UBS to put a "sell" recommendation on Peabody Energy as well as on Powder River Basin powerhouse Cloud Peak Energy. A report by industry analysts Wood Mackenzie last week suggested two-thirds of coal mines are losing money at current coal prices. Peabody Energy may have to restructure with growing pressure on its balance sheet and the ongoing malaise in the US coal mining industry, a report by broking house JP Morgan states.