Massachusetts opens probe into sales of Puerto Rican muni debt

BOSTON, Oct 9 (Reuters) - Massachusetts' top securities regulator said on Wednesday that he is investigating how Puerto Rican municipal bonds, which have long been popular with mutual fund managers and retail investors, were sold in the state.

William Galvin, Massachusetts secretary of the Commonwealth, said his office has sent inquiry letters to home state investment manager Fidelity Investments, plus Oppenheimer Funds and UBS Financial Services.