The euro zone saw the fastest business growth this year, with the Composite Purchasing Managing Index (PMI) for November coming in at 54.1, the highest since December 2015 and up from 53.3 in October, according to data provider Markit.
Both the manufacturing and service sectors increased at similar rates, with the latter reaching an 11-month high.
"The preliminary PMI results for November indicate the sharpest monthly increase in business activity so far this year, with plenty of signs that growth will continue to accelerate," Chris Williamson, chief business economist at IHS Markit, said in a statement.
Wednesday's readings point to a 0.4 percent gross domestic product (GDP) growth in the member bloc for the fourth quarter of this year, according to Markit.
"What's especially encouraging to see is the build-up of uncompleted orders, which showed the largest rise since May 2011," Williamson added.