Supporters react at a 'Vote Leave' rally in Newcastle upon Tyne, England.

A new poll showing a majority of British people in favor of leaving the European Union hit foreign exchange and stock markets on Friday.

The data in London newspaper The Independent showed that 55 percent believe Britain should leave the EU, versus 45 percent who favored staying. The publication said it marked the largest portion of respondents who favored exiting since research firm ORB began polling the issue for it last year.