MFS InterMarket Income Trust I is a closed-ended fixed income mutual fund launched by Massachusetts Financial Services Company. It is managed by MFS Investment Management. The fund invests in the fixed income markets across the globe. It primarily invests in U.S. and foreign government and lower-rated corporate debt securities. The fund was formerly known as Colonial InterMarket Income Trust I. It was formed on September 22, 1989 and is domiciled in the United States.