AGC Declares Initial Monthly Dividend.

LISLE, Ill. -- Advent/Claymore Global Convertible Securities & Income Fund (NYSE:AGC) has declared its initial monthly dividend of $0.1458 per share. This represents an annualized distribution rate of 8.99% based upon the closing market price of $19.46 on July 11, 2007.

The Fund's investment objective is to provide total return, through a combination of capital appreciation and current income. Under normal market conditions, the Fund will invest at least 80% of its assets in convertible and non-convertible income-producing securities, each of U.S. and non-U.S. issuers, in order to attempt to achieve this objective.

Dividends will be paid on August 31, 2007 to shareholders of record as of August 15, 2007. The ex-dividend date will be August 13, 2007. If it is determined that a notification is required, pursuant to Section 19(a) of the Investment Company Act of 1940, as amended, such notice will be posted to the Fund's website after the close of business three business days prior to the payable date.

Advent Capital Management, LLC serves as the Fund's Investment Manager. Based in New York, New York, Advent is a credit-oriented firm specializing in the management of convertible, high-yield and equity securities across three lines of business - long-only strategies, hedge funds and closed-end mutual funds. The firm manages assets for several FORTUNE 500 companies, foundations, endowments, public pension plans, insurance companies and two other closed-end funds, the Advent Claymore Convertible Securities and Income Fund (NYSE:AVK) and the Advent/Claymore Enhanced Growth & Income Fund (NYSE:LCM).

Claymore Advisors, LLC, an affiliate of Claymore Securities, Inc., serves as Investment Adviser to the Fund. Claymore Securities, Inc. is a privately-held financial services company offering unique investment solutions for financial advisors and their valued clients. Claymore entities have provided supervision, management, servicing or distribution on approximately $17 billion, as of May 31, 2007, in assets through closed-end funds, unit investment trusts, mutual funds, separately managed accounts, exchange-traded funds and Claymore MACROshares. Additional information on Claymore's closed-end funds is available at www.claymore.com/CEFs. Registered investment products are sold by prospectus only and investors should read the prospectus carefully before investing.

This information does not represent an offer to sell securities of the Fund and it is not soliciting an offer to buy securities of the Fund. There can be no assurance that the Fund will achieve its investment

objectives. The net asset value of the Fund will fluctuate with the value of the underlying securities. It is important to note that closed-end funds trade on their market value, not net asset value, and closed-end funds often trade at a discount to their net asset value. Past performance is not indicative of future performance. An investment in the Fund is subject to certain risks and other considerations. Convertible securities generally offer lower interest or dividend yields than non-convertible securities of similar quality. Investments in non-U.S. issuers may involve unique risks compared to investing in securities of U.S. issuers and are more pronounced to the extent that the Fund invests a significant portion of its non-U.S. investments in one region or in the securities of emerging market issuers. In addition the Fund is also subject, but not limited to: Investment and Market Risk, Synthetic Convertible Securities Risk, Lower Grade Securities Risk (a.k.a. "Junk Bond" Risk), Leverage Risk, Derivatives Risk, Interest Rate Risk, Leverage Risk, Anti-Takeover Provisions, Market Disruption Risk and Illiquidity Risk.

Investors should consider the investment objectives and policies, risk considerations, charges and expenses of the Fund carefully before they invest. For this and more information, please contact a securities representative or Claymore Securities, Inc., 2455 Corporate West Drive, Lisle, Illinois 60532, 800-345-7999.

Member NASD/SIPC (07/07)

NOT FDIC-INSURED - NOT BANK-GUARANTEED - MAY LOSE VALUE