Poland’s WSE’s biggest companies, WIG20 index, ended the fourth quarter in the black, as the companies on it earned a total of PLN 11.7bn in the last three months of 2011. It’s an increase of 56.4 percent compared to the same period in 2010. The companies, however, are holding their collective breath over the current quarter’s results, as there’s an expectation now that weaker earnings could be announced. KGHM, the copper miner that’s helped drive up the results, could feel the impact of higher mining taxes, according to the parkiet.pl website, but prices are not expected to rise.