The report "Brexit and Business: The EU Outlook" looks into the impact of Brexit on 800 businesses of six major EU markets, such as France, Germany, Spain, the Netherlands, Sweden and Ireland.
"[A total of] 46% of respondents from EU27 businesses say that their company has reduced investment in the UK," the report said.
Forty-seven percent of businesses reported reduced trade or operations in the country, with 46 percent noting that they had already felt disruption to their supply chains resulting in view of the Brexit vote.
A total of 800 respondents took part in the survey.
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The United Kingdom voted to leave the European Union in a referendum in 2016. The Brexit negotiations officially kicked off in June 2017 and are expected to be completed by the end of March 2019, with the country leaving the bloc.