Montgomery Street Income Securities, Inc. Announces New Administrator

Montgomery Street Income Securities, Inc. (NYSE: MTS) (the “Fund”) announced today that it has appointed Atlantic Fund Services (“Atlantic”) as the new administrator of the Fund, effective August 1, 2015. In connection with this appointment, Stacey E. Hong will become the President and Chief Executive Officer, and Michael J. McKeen will become Treasurer and Chief Financial Officer, of the Fund. Messrs. Hong and McKeen are affiliated with Atlantic.

The scope of services to be provided by Atlantic and the fees to be paid by the Fund for these services are expected to be essentially the same as those under the agreement with the Fund’s current administrator.

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

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