Putnam Investment Management, LLC announced today that its co-managed fixed-income mutual fund, the Putnam Municipal Opportunities Trust, has invested heavily in the US fixed-income market. The fund, which launched in 1993, seeks out companies operating in key sectors of the American economy, including healthcare, utilities, transportation, water and sewer, as well as housing. The fund has been a focal point for many investors seeking to capitalize on these sectors, and it continues to be domiciled in the United States.