Tranche Update on MFS Investment Grade Municipal Trust's Equity Buyback Plan announced on August 25, 2023.

MFS Investment Grade Municipal Trust (the Fund) is a diversified closed-end management investment company. The Fund’s investment objective is to seek high current income exempt from federal income tax, but may also consider capital appreciation. The Fund invests, under normal market conditions, at least 80% of its net assets, including assets attributable to preferred shares and borrowings for investment purposes, in tax-exempt bonds and tax-exempt notes. The Fund may also invest in below-investment grade quality debt instruments. It invests in various sectors, such as healthcare, general obligations, universities, water and sewer utilities, toll roads, student loan, airports, and state and local appropriations. The fund offers a Dividend Reinvestment and Cash Purchase Plan that allows common shareholders to reinvest either all the distributions paid by the fund or only the long-term capital gains. The Fund's investment adviser is Massachusetts Financial Services Company.