DUBLIN—The Irish government on Friday extended the gradual sell down of its shares in Bank of Ireland to May 2022, having raised 249 million euros ($287.79 million) in the last three months by cutting its stake to 9.3 percent from 13.9 percent. The government announced in late June that it intended to cut its shareholding in a trading plan that was due to end in January. The finance ministry said on Friday that it had sold the shares at an average price of 4.96 euros. Shares in Bank of Ireland, the country’s largest bank by assets, closed at 5.15 euros on Thursday. Ireland pumped 64 billion euros, or almost 40 percent of its annual economic output, into its banks a decade ago after a property crash, with Bank of Ireland the only lender to avoid majority state ownership. The Bank of Ireland sales is the first time the state has …