"According to this methodology, Ireland and other small open financial centers lead the list of sovereigns vulnerable to a UK decision to exit the EU," S&P credit analyst Frank Gill said as quoted in the report titled "Who Has The Most To Lose From Brexit? Introducing The Brexit Sensitivity Index."
All three countries topping the ranking of most Brexit-vulnerable states have extensive historical connections with the United Kingdom, while Ireland has a common border and substantial migratory flows with Britain. Malta is considered one of the top tourist destinations for Brits, with a large UK pensioner population residing on the island.
UK citizens are set to vote in the referendum on the United Kingdom's EU membership on June 23. UK Electoral Commission Chair Jenny Watson said Wednesday the commission expected an 80-percent turnout at the referendum.