John Hancock Preferred Income Fund Reports Earnings Results for the Third Quarter Ended April 30, 2017

John Hancock Preferred Income Fund (the Fund) is a closed-end, diversified management investment company. The Fund's primary investment objective is to provide a high level of current income, consistent with preservation of capital. The Fund's secondary investment objective is to provide growth of capital to the extent consistent with its primary investment objective. The Fund seeks to achieve its objectives by investing in securities that, in the opinion of the advisor, may be undervalued relative to similar securities in the marketplace. The Fund invests at least 80% of its assets (net assets plus borrowings for investment purposes) in preferred stocks and other preferred securities, including convertible preferred securities. The Fund intends to invest primarily in fully taxable preferred securities. The Fund's portfolio of preferred securities may include both fixed rate and adjustable-rate securities. The Fund's investment advisor is John Hancock Investment Management LLC.