The Board of Directors of Montgomery Street Income Securities, Inc. (NYSE: MTS) (the “Fund”) has set November 16, 2015 as the date of the special meeting at which stockholders will be asked to vote on the liquidation of the Fund. In anticipation of the liquidation, the Board has also determined to eliminate the dividend that would ordinarily be declared in October and, instead, to include the net income that has been earned for that dividend in the liquidating distribution that is expected in late December. In the event stockholders do not approve the liquidation, the Board will declare the dividend that had been eliminated, together with any other year-end dividend that would be necessary to satisfy the Fund’s income and excise tax distribution requirements for 2015.

Proxy materials for the special meeting are being distributed to stockholders this week. Pending the special meeting, the Fund’s investments will continue to be managed in accordance with the current investment objectives and policies of the Fund. If stockholders approve the liquidation, the Fund’s investments will be sold and the Fund will make one or more cash distributions to stockholders, after providing for liquidation expenses and any other liabilities. The Fund will then cease operations.

The Fund is a closed-end diversified management investment company whose primary investment objective is to seek as high a level of current income as is consistent with prudent investment risks, from a diversified portfolio primarily of debt securities. The Fund’s shares are traded on the New York Stock Exchange under the symbol MTS.

Closed-end funds, unlike open-end funds, are not continuously offered. There is generally a one-time public offering and, once issued, shares of closed-end funds are sold in the open market through a stock exchange. Shares of closed-end funds frequently trade at a discount to net asset value.

The price of the Fund’s shares is determined by a number of factors, several of which are beyond the control of the Fund. Therefore, the Fund cannot predict whether its shares will trade at, below or above net asset value.

Investments in funds involve risk. Yields and market values will fluctuate. Investing in foreign markets presents certain unique risks not associated with domestic investments, such as currency fluctuations, political and economic changes and market risks. Additionally, the Fund invests in lower-quality and non-rated securities, which present greater risks of loss of principal and interest than higher-quality securities. All of these factors may result in greater share price volatility.

This announcement is not an offer to purchase or the solicitation of an offer to sell shares of the Fund, a prospectus, a circular or representation intended for use in the purchase or sale of Fund shares, or a proxy solicitation.

NOT FDIC/NCUA INSURED MAY LOSE VALUE NO BANK GUARANTEE
NOT A DEPOSIT NOT INSURED BY ANY FEDERAL GOVERNMENT AGENCY