Claymore/Guggenheim Intermediate Investment-Grade Corporate Trust Series 18

The Trust will invest in a portfolio of corporate bonds. The Sponsor will select bonds that it believes have the best chance to meet the Trust’s investment objective over its life.

The portfolio of the Trust consists of corporate debt obligations which may include U.S. government bonds, corporate bonds, mortgage- and asset-backed securities, loan participations and corporate instruments. All of the corporate bonds held in the Trust will be rated investment-grade quality, as of the Trust’s initial date of deposit (the “Inception Date”), by at least one of the following ratings agencies: Standard & Poor’s, a division of The McGraw-Hill Companies, Inc. (“Standard & Poor’s”), or Moody’s Investors Service (“Moody’s”). Such rating relates to the underlying bonds and not the trust or the value of the units, which will fluctuate. There can be no assurance that any security contained in the Trust will retain an investment-grade rating for the life of the Trust. Investment-grade bonds are bonds that are rated at least in the category of BBB by Standard & Poor’s or Baa by Moody’s. A rating in the category of BBB or Baa is the lowest possible investment-grade rating. See “Description of Bond Ratings” for details.

Certain bonds in the Trust may be covered by insurance policies obtained from corporate bond insurers identified in “Trust Portfolio,” which guarantee payment of principal and interest on the bonds when due. As a result of such insurance, the insured bonds may receive ratings that reflect the creditworthiness of the bond insurer. Please note that the insurance relates only to the insured bonds in the Trust and not to the units or the market value of the bonds or of the units.

The Trust intends to pay interest distributions each month and expects to prorate the interest distributed on an annual basis; see “Distributions.” The record dates and distribution dates for principal and interest distributions are the 15th and 25th of each month, respectively. Furthermore, investors may receive principal distributions from bonds being called or sold prior to their maturity or as bonds mature.

The Sponsor has selected Guggenheim Partners Investment Management, LLC ("GPIM"), a wholly-owned subsidiary of Guggenheim Partners, LLC, to assist the Sponsor with the selection of the Trust’s portfolio.

The Sponsor considered the following factors, among others, in selecting the bonds:

• The bonds must be rated as investment-grade or above by at least one of the rating agencies (BBB- or above by Standard & Poor’s or Baa3 or above by Moody’s);
• The price of the bonds relative to other bonds with comparable characteristics;
• The diversification of bonds with respect to the issuer with no one issuer comprising more than 20% of the final portfolio;
• Attractiveness of the interest payments relative to bonds with similar characteristics; and
• The potential for early return of principal or any event risk which could have a negative impact on the price of the bonds.

Guggenheim Partners Investment Management, LLC (GPIM)

Guggenheim Partners Investment Management, LLC, is a wholly-owned subsidiary of Guggenheim Partners, LLC, which offers financial services expertise within its asset management, investment advisory, capital markets, institutional finance and merchant banking business lines. Clients consist of an elite mix of individuals, family offices, endowments, foundations, insurance companies, pension plans and other institutions that together have entrusted the firm with supervision of more than $100 billion in assets. A global diversified financial services firm, Guggenheim Partners, LLC office locations include New York, Chicago, Los Angeles, Miami, Boston, Philadelphia, St. Louis, Houston, London, Dublin, Geneva, Hong Kong, Singapore, Mumbai and Dubai.

The Sponsor is also a wholly-owned subsidiary of Guggenheim Partners, LLC. See “General Information” for additional information.

As with all investments, you may lose some or all of your investment in the Trust. No assurance can be given that the Trust’s investment objective will be achieved. The Trust also might not perform as well as you expect. This can happen for reasons such as these:

• Corporate bonds are fixed rate debt obligations that generally decline in value with increases in interest rates. Foreign and U.S. interest rates may rise or fall by differing amounts and, as a result, the Trust’s investment in foreign securities may expose the Trust to additional risks. Generally, bonds with longer periods before maturity are more sensitive to interest rate changes.
• Corporate bonds are subject to credit risk in that an issuer of a bond may be unable to make interest and principal payments when due. In general, lower rated bonds carry greater credit risk.
• The Sponsor does not actively manage the portfolio. Because the portfolio is fixed and not managed, in general, the Trust only sells bonds at the Trust’s termination or in order to meet redemptions, for tax purposes, for credit issues or to pay sales charges and expenses. As a result, the price at which a bond is sold may not be the highest price the Trust could have received during the life of the Trust. Units of the Trust are not deposits of any bank and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
• No assurance can be given that the Trust’s investment objective will be achieved. This objective is subject to the continuing ability of the respective issuers of the bonds to meet their obligations.
• The Trust is subject to market risk. Market value fluctuates in response to various factors. These can include changes in interest rates, inflation, the financial condition of a bonds’ issuer, perceptions of the issuer, ratings on a bond, or political or economic events affecting the issuer.
• Due to the current state of the economy, the value of the securities held by the Trust may be subject to steep declines or increased volatility due to changes in performance or perception of the issuers. Starting in December 2007 and throughout most of 2009, economic activity declined across all sectors of the economy, and the United States experienced increased unemployment. The economic crisis affected the global economy with European and Asian markets also suffering historic losses. Although the latest economic data suggests slightly increased activity in the U.S. economy, unemployment remains high. Extraordinary steps have been taken by the governments of several leading economic countries to combat the economic crisis; however, the impact of these measures is not yet fully known and cannot be predicted.
• An issuer or an insurer of the bonds may be unwilling or unable to make principal payments and/or to declare distributions in the future, may call a security before its stated maturity, or may reduce the level of distributions declared. In addition, there is no guarantee that the issuers will be able to satisfy their interest or principal payment obligations to the Trust over the life of the Trust. This may result in a reduction in the value of your units.
• The financial condition of an issuer or an insurer of the bonds may worsen or its credit ratings may drop, resulting in a reduction in the value of your units. This may occur at any point in time, including during the primary offering period. There can be no assurance that any security contained in the Trust will retain an investment-grade rating for the life of the Trust.
• The income generated by the Trust may be reduced over time in response to bond sales, changes in distributions paid by issuers, unit redemptions and expenses.
• The Trust will invest in foreign securities. The Trust’s investment in foreign securities presents additional risk. Foreign risk is the risk that foreign securities will be more volatile than U.S. securities due to such factors as adverse economic, currency, political, social or regulatory developments in a country, including government seizure of assets, excessive taxation, limitations on the use or transfer of assets, the lack of liquidity or regulatory controls with respect to certain industries or differing legal and/or accounting standards.
• Certain corporate bonds may be rated as investment-grade by only one rating agency. As a result, such split-rated securities may have more speculative characteristics and are subject to a greater risk of default than securities rated as investment-grade by both Standard & Poor’s and Moody’s.
• The Trust may sell bonds to meet redemptions, pay deferred sales fees and expenses, for credit issues and in other circumstances. Accordingly, the size, diversity, composition, returns and income generated by the Trust may be adversely affected. In addition, such sales of bonds may be at a loss. If such sales are substantial enough, provisions of the Trust’s indenture could cause a complete and unexpected liquidation of the Trust before its scheduled maturity, resulting in unanticipated losses for investors.
• Certain of the bonds included in the Trust may be original issue discount bonds or “zero coupon” bonds, as noted in “Trust Portfolio.” These bonds may be subject to greater price fluctuations with changing interest rates and contain additional risks.
• Inflation may lead to a decrease in the value of assets or income from investments.