The Warsaw Stock Exchange’s blue-chip WIG20 index rose by 2.33% last Thursday, the highest increase since November, reported Parkiet. At one point during the session, the index had even gained 3.3%. The gains were largely the result of news that ratings agency Fitch could upgrade Poland’s credit rating. Another factor impacting the markets was positive news from the US, where better financial results from listed companies, as well as an increase in demand for durable goods, were recorded.