Reuters | Oil holds above November lows but under threat from US supply Reuters Investors in U.S. crude futures and options increased their bets against a further rise in prices, as the number of U.S. oil rigs in operation hit its highest in over three years. [CFTC/] [RIG/U]. U.S. shale oil output is up around 10 percent since ... Oil edges above November lows but under threat from US supply surge |