On 22 June 2011, the parliament elected Jyrki Katainen as prime minister by a vote of 118–72; two Left Alliance MPs voted against Katainen, for which they were formally reprimanded by the Left Alliance parliamentary group. They were subsequently expelled from the group, reducing the government majority from 126 MPs to 124. In March 2014 the Left Alliance announced that it was leaving the cabinet, citing the party's opposition to budget cuts in social welfare programs, which had been agreed to by the other five parties. This reduced the government's majority to 112 MPs.
In April 2014 Jyrki Katainen announced that he would not seek another term as the chairman of the National Coalition Party. The NCP chose Alexander Stubb as its new chairman in June, and he subsequently became the new Prime Minister. In September 2014 the Green League announced that it was leaving the cabinet. The Greens were opposed to the other governing parties' decision to grant Fennovoima a licence for building a nuclear power plant in Pyhäjoki. The Greens' departure cut the government's majority to 102 MPs (including the Speaker of the Parliament, who does not vote).
In 2013 the parliament decided to merge certain electoral districts to create larger districts: the electoral districts of Northern Savonia and Northern Karelia will be merged into a new district called Savonia-Karelia, while the electoral districts of Kymi and Southern Savonia will be merged into a new district called South-Eastern Finland.
Poll results are listed in the table below in reverse chronological order, showing the most recent first. The highest percentage figure in each poll is displayed in bold, and the background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. The table uses the date the survey's fieldwork was done, as opposed to the date of publication. However, if that date is unknown, the date of publication will be given instead.
Opinion polls showing seat projections are displayed in the table below. The highest seat figures in each polling survey have their background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. 101 seats are required for an absolute majority in the Finnish Parliament.