Major bourses, meanwhile, ended mixed, with the U.K.'s FTSE 100 rising 0.22 percent, and Germany's DAX ending above the flatline, up 0.02 percent. France's CAC 40, however, slipped 0.17 percent.
Financials and banking stocks underperformed several sectors Wednesday, on earnings and doubts over U.S. plans to reform the tax system. French bank Credit Agricole fell over 3 percent after posting lower net profits. Italy's BPM meanwhile sank 7.5 percent, after it was halted during early morning trading, Reuters reported.
Elsewhere, the European Union put forward tougher car emissions objectives Wednesday, which included a credit system for automakers to push the rollout of electric vehicles and fines for exceeding carbon dioxide limits; Reuters reported. Autos sank 1.31 percent, making it Europe's worst performing sector of the day.
Utility stocks fluctuated during trade, before recovering to close up. Investors showed concern during the session over regulation on a proposed merger between the British firm SSE and Innogy. They announced earlier that they would merge their British retail energy business. SSE fell to the bottom of the index, while Innogy finished higher.