UPDATE 1-U.S.-based Treasury-heavy funds post $2.2 bln outflows in week - Lipper

(Adds views from head of Americas research at Lipper, table) By Sam Forgione NEW YORK, May 28 (Reuters) - Investors in U.S.-based funds pulled $2.2 billion out of funds that mainly hold U.S. Treasuries in the week ended May 27, data from Thomson Reuters' Lipper service showed on Thursday. The outflows were the first in three weeks and the biggest since early March. Taxable bond funds overall posted $2.1 billion in outflows to mark their first withdrawals in three weeks. Stock