DWCH Datawatch Corp. (delisted)

THE FUND SUMMARY

Portfolio Turnover. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 3% of the average value of its portfolio.

MORE ABOUT THE FUND

About the Fund's Investments

The allocation of the Fund's portfolio among different types of investments will vary over time and the Fund's portfolio might not always include all of the different types of investments described below. The Statement of Additional Information contains additional information about the Fund's investment policies and risks.

The Fund's Principal Investment Strategies and Risks.  The strategies and types of investments discussed in the Fund Summary are the ones that the Fund considers to be the most important in seeking to achieve its investment objective.  Additionally, the following strategies and risks are those the Fund expects its portfolio to be subject to as a whole.

The Sub-Adviser tries to reduce risks by selecting a wide variety of municipal investments and by carefully researching securities before they are purchased. However, changes in the overall market prices of municipal securities and the income they pay can occur at any time. The yield and share prices of the Fund can change daily based on changes in interest rates and market conditions and in response to other economic events.

     Unless this prospectus or the Statement of Additional Information states that an investment percentage restriction applies on an ongoing basis, it applies only at the time the Fund makes an investment (except for borrowing and investments in illiquid securities).

Municipal Securities.   Municipal securities are issued to raise money for a variety of public or private purposes, including financing state or local governments, financing specific projects or financing public facilities. These debt obligations are issued by the state governments, as well as their political subdivisions (such as cities, towns, and counties) and their agencies and authorities. The Fund buys municipal bonds and notes, tax-exempt commercial paper, certificates of participation in municipal leases and other debt obligations. Municipal securities generally are classified as general or revenue obligations. General obligations are secured by the issuer's pledge of its full faith, credit and taxing power for the payment of principal and interest. Revenue obligations are bonds whose interest is payable only from the revenues derived from a particular facility or class of facilities, or a specific excise tax or other revenue source. Some revenue obligations are private activity bonds that pay interest that may be a tax preference item for investors subject to the federal alternative minimum tax. The Fund selects investments without regard to this type of tax treatment.

Additionally, there are times when an issuer will pledge its taxing power to offer additional security to a revenue bond. These securities are sometimes called "double-barreled bonds." 

The Fund can buy both long-term and short-term municipal securities. Long-term securities have a maturity of more than one year. The Fund generally focuses on longer-term securities to seek higher income.

      Arizona municipal securities are municipal securities that are not subject (in the opinion of bond counsel to the issuer at the time they are issued) to federal and Arizona individual income tax. The term "Arizona municipal securities" also includes debt securities of the governments of certain possessions, territories and commonwealths of the United States if the interest is not subject to federal and Arizona individual income tax. For additional discussion of the special considerations relating to the Fund's investments in Arizona and the U.S. territories, commonwealths and possessions, see the Statement of Additional Information. Some debt securities, such as zero-coupon securities, do not pay current interest. Other securities may be subject to calls by the issuer (to redeem the debt) or to prepayment prior to their stated maturity.

Municipal securities may be subject to the following risks:

• Interest Rate Risk. Interest rate risk is the risk that rising interest rates, or an expectation of rising interest rates in the near future, will cause the values of the Fund's investments to decline. The values of debt securities usually change when prevailing interest rates change. When interest rates rise, the values of outstanding debt securities generally fall, and those securities may sell at a discount from their face amount. When interest rates rise, the decrease in values of outstanding debt securities may not be offset by higher income from new investments. When interest rates fall, the values of already-issued debt securities generally rise. However, when interest rates fall, the Fund's investments in new securities may be at lower yields and may reduce the Fund's income. The values of longer-term debt securities usually change more than the values of shorter-term debt securities when interest rates change; thus, interest rate risk is usually greater for securities with longer maturities or durations. "Zero-coupon" or "stripped" securities may be particularly sensitive to interest rate changes. Risks associated with rising interest rates are heightened given that interest rates in the U.S. are at, or near, historic lows.

• Duration Risk. Duration risk is the risk that longer-duration debt securities are more likely to decline in price than shorter-duration debt securities, in a rising interest-rate environment. Duration is a measure of the price sensitivity of a debt security or portfolio to interest rate changes. "Effective duration" attempts to measure the expected percentage change in the value of a bond or portfolio resulting from a change in prevailing interest rates. The change in the value of a bond or portfolio can be approximated by multiplying its duration by a change in interest rates. For example, if a bond has an effective duration of three years, a 1% increase in general interest rates would be expected to cause the bond's value to decline about 3% while a 1% decrease in general interest rates would be expected to cause the bond's value to increase 3%. The duration of a debt security may be equal to or shorter than the full maturity of a debt security.

• Credit Risk. Credit risk is the risk that the issuer of a security might not make interest and principal payments on the security as they become due. U.S. government securities generally have lower credit risks than securities issued by private issuers or certain foreign governments. If an issuer fails to pay interest, the Fund's income might be reduced, and if an issuer fails to repay principal, the value of the security might fall and the Fund could lose the amount of its investment in the security. The extent of this risk varies based on the terms of the particular security and the financial condition of the issuer. A downgrade in an issuer's credit rating or other adverse news about an issuer, for any reason, can reduce the market value of that issuer's securities.

• Credit Spread Risk. Credit spread risk the risk that credit spreads (i.e., the difference in yield between securities that is due to differences in their credit quality) may increase when the market expects lower-grade bonds to default more frequently. Widening credit spreads may quickly reduce the market values of the Fund's lower-rated and unrated securities. Some unrated securities may not have an active trading market or may trade less actively than rated securities, which means that the Fund might have difficulty selling them promptly at an acceptable price.

• Extension Risk. Extension risk is the risk that, if interest rates rise rapidly, repayments of principal on certain debt securities may occur at a slower rate than expected, and the expected maturity of those securities could lengthen as a result. Securities that are subject to extension risk generally have a greater potential for loss when prevailing interest rates rise, which could cause their values to fall sharply. Extension risk is particularly prevalent for a callable security where an increase in interest rates could result in the issuer of that security choosing not to redeem the security as anticipated on the security's call date. Such a decision by the issuer could have the effect of lengthening the debt security's expected maturity, making it more vulnerable to interest rate risk and reducing its market value.

• Reinvestment Risk. Reinvestment risk is the risk that when interest rates fall, the Fund may be required to reinvest the proceeds from a security's sale or redemption at a lower interest rate. Callable bonds are generally subject to greater reinvestment risk than non-callable bonds.

• Prepayment Risk. Certain fixed-income securities are subject to the risk of unanticipated prepayment. Prepayment risk is the risk that, when interest rates fall, the issuer will redeem the security prior to the security's expected maturity, or that borrowers will repay the loans that underlie these fixed-income securities more quickly than expected, thereby causing the issuer of the security to repay the principal prior to expected maturity. The Fund may need to reinvest the proceeds at a lower interest rate, reducing its income. Securities subject to prepayment risk generally offer less potential for gains when prevailing interest rates fall. If the Fund buys those securities at a premium, accelerated prepayments on those securities could cause the Fund to lose a portion of its principal investment. The impact of prepayments on the price of a security may be difficult to predict and may increase the security's price volatility. Interest-only and principal-only securities are especially sensitive to interest rate changes, which can affect not only their prices but can also change the income flows and repayment assumptions about those investments.

U.S. Territories, Commonwealths and Possessions. The Fund also invests in obligations of the governments of the U.S. territories, commonwealths and possessions such as Puerto Rico, the U.S. Virgin Islands, Guam and the Northern Mariana Islands to the extent such obligations are exempt from state income taxes.  Accordingly, the Fund may be adversely affected by local political, economic and social conditions and developments within these U.S. territories, commonwealths and possessions affecting the issuers of such obligations. A discussion of the special considerations relating to the Fund's municipal obligations and other factors or economic conditions in those territories, commonwealths or possessions is provided in an Appendix to the Statement of Additional Information. 

     Significant Investment in Puerto Rico Municipal Securities. As of its most recent fiscal year-end, the Fund invested a significant percentage of its total assets in Puerto Rican municipal securities, which are exempt from federal, state, and, where applicable, local income taxes. The Sub-Adviser expects the Fund to remain invested in municipal securities issued in Puerto Rico, subject to market, economic and political conditions. Like many U.S. states and municipalities, Puerto Rico experienced a significant downturn during the recent recession. Puerto Rico continues to face significant fiscal challenges, including persistent government deficits, underfunded public pension benefit obligations, underfunded government retirement systems, sizable debt service obligations and a high unemployment rate. As a result of Puerto Rico's challenging economic and fiscal environment, many ratings organizations have downgraded a number of securities issued in Puerto Rico or placed them on "negative watch"; the Fund holds some of these securities. If the economic situation in Puerto Rico persists or worsens, the volatility, credit quality and performance of the Fund could be adversely affected.

Tax-Exempt Commercial Paper.  Tax-exempt commercial paper is a short-term obligation with a stated maturity of usually 270 days or less. It is issued by state and local governments or their agencies to finance seasonal working capital needs or as short-term financing in anticipation of longer-term financing. While tax-exempt commercial paper is intended to be repaid from general revenues or refinanced, it frequently is backed by a letter of credit, lending arrangement, note, repurchase agreement or other credit facility agreement offered by a bank or financial institution. Because tax-exempt issuers may constantly reissue their commercial paper and use the proceeds (or other sources) to repay maturing paper, the commercial paper of a tax-exempt issuer that is unable to continue to obtain liquidity in that manner may default. There may be a limited secondary market for issues of tax-exempt commercial paper.

Municipal Lease Obligations. Municipal leases are used by state and local governments to obtain funds to acquire land, equipment or facilities. The Fund can invest in certificates of participation that represent a proportionate interest in payments made under municipal lease obligations. Most municipal leases, while secured by the leased property, are not general obligations of the issuing municipality. They often contain "non-appropriation" clauses under which the municipal government has no obligation to make lease or installment payments in future years unless money is appropriated on a yearly basis.

If the municipal government stops making payments or transfers its payment obligations to a private entity, the obligation could lose value or become taxable. Although the obligation may be secured by the leased equipment or facilities, the disposition of the property in the event of non-appropriation or foreclosure might prove difficult, time consuming and costly, and may result in a delay in recovering or the failure to recover the original investment. Some lease obligations may not have an active trading market, making it difficult for the Fund to sell them quickly at an acceptable price.

Tobacco Related Bonds. The Fund may invest in two types of tobacco related bonds: (i) tobacco settlement revenue bonds, for which payments of interest and principal are made solely from a state's interest in the Master Settlement Agreement ("MSA") and (ii) tobacco bonds subject to a state's appropriation pledge, for which payments may come from both the MSA revenue and the applicable state's appropriation pledge.

• Tobacco Settlement Revenue Bonds. For purposes of the Fund's industry concentration policy, the Fund may invest up to 25% of its total assets in tobacco settlement revenue bonds. Tobacco settlement revenue bonds are secured by an issuing state's proportionate share in the MSA, a litigation settlement agreement reached out of court in November 1998 between 46 states and six other U.S. jurisdictions and the four largest U.S. tobacco manufacturers at that time. Subsequently, a number of smaller tobacco manufacturers signed on to the MSA, which provides for annual payments by the manufacturers to the states and other jurisdictions in perpetuity. The MSA established a base payment schedule and a formula for adjusting payments each year. Tobacco manufacturers pay into a master escrow trust based on their market share and each state receives a fixed percentage of the payment.

     A number of states have securitized the future flow of those payments by selling bonds, some through distinct governmental entities created for such purpose. The bonds are backed by the future revenue flows from the tobacco manufacturers. Annual payments on the bonds, and thus the risk to the Fund, are highly dependent on the receipt of future settlement payments. The amount of future settlement payments is dependent on many factors including, but not limited to, annual domestic cigarette shipments, cigarette consumption, inflation and the financial capability of participating tobacco companies. As a result, payments made by tobacco manufacturers could be reduced if the decrease in tobacco consumption is significantly greater than the forecasted decline. A market share loss by the MSA companies to non-MSA participating tobacco manufacturers could also cause a downward adjustment in the payment amounts. A participating manufacturer filing for bankruptcy also could cause delays or reductions in bond payments, which could affect the Fund's net asset value.

     The MSA and tobacco manufacturers have been and continue to be subject to various legal claims, including challenges by participating tobacco manufacturers regarding the amount of annual payments owed under the MSA, and an adverse outcome could affect the payment streams associated with the MSA or cause delays or reductions in bond payments. The MSA itself has been subject to legal challenges and has, to date, withstood those challenges. The Statement of Additional Information contains more detailed information about the litigation related to the tobacco industry and the MSA.

•   "Subject to Appropriation" (STA) Tobacco Bonds. In addition to the tobacco settlement bonds discussed above, the Fund also may invest in tobacco related bonds that are subject to a state's appropriation pledge ("STA Tobacco Bonds"). STA Tobacco Bonds rely on both the revenue source from the MSA and a state appropriation pledge. These STA Tobacco Bonds are part of a larger category of municipal bonds that are subject to state appropriation. Although specific provisions may vary among states, "government appropriation" or "subject to appropriation" bonds (also referred to as "appropriation debt") are typically payable from two distinct sources: (i) a dedicated revenue source such as a municipal enterprise, a special tax or, in the case of tobacco bonds, the MSA funds, and (ii) from the issuer's general funds.

     Appropriation debt differs from a state's general obligation debt in that general obligation debt is backed by the state's full faith, credit and taxing power, while appropriation debt requires the state to pass a specific periodic appropriation to pay interest and/or principal on the bonds. The appropriation is usually made annually. While STA Tobacco Bonds offer an enhanced credit support feature, that feature is generally not an unconditional guarantee of payment by a state and states generally do not pledge the full faith, credit or taxing power of the state. The Fund considers STA Tobacco Bonds to be "municipal securities" for purposes of its concentration policies.

Municipal Sector Concentration. While the Fund's fundamental policies do not allow it to concentrate its investments (that is, to invest more than 25% of its total assets) in a single industry, certain types of municipal securities are not considered a part of any "industry" under that policy.  Examples of these types of municipal securities include:  general obligation, government appropriation, municipal leases, special assessment and special tax bonds.  Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities, which may finance similar types of projects or from which the interest is paid from revenues of similar types of projects.  "Similar types of projects" are projects that are related in such a way that economic, business or political developments tend to have the same impact on each similar project.  For example, a change that affects one project, such as proposed legislation on the financing of the project, a shortage of the materials needed for the project, or a declining economic need for the project, would likely affect all similar projects, thereby increasing market risk.  Thus, market or economic changes that affect a security issued in connection with one project also would affect securities issued in connection with similar types of projects. 

Although these types of municipal securities may be related to certain industries, because they are issued by governments or their political subdivisions, these types of municipal securities are not considered a part of any industry for purposes of the Fund's industry concentration policy.

Land-Secured or "Dirt" Bonds (Special Tax or Special Assessment Bonds). The Fund can invest more than 25% of its total assets in municipal securities for similar types of projects that are issued in connection with special taxing districts that are organized to plan and finance infrastructure development to induce residential, commercial and industrial growth and redevelopment. The bonds financed by these methods, such as tax assessment, special tax or tax increment financing generally are payable solely from taxes or other revenues attributable to the specific projects financed by the bonds without recourse to the credit or taxing power of related or overlapping municipalities. These projects often are exposed to real estate development-related risks, such as the failure of property development, availability of financing, extended vacancies of properties, increased competition, limitations on rents, changes in neighborhood values and the demand of properties to tenants, and changes in interest rates. These real estate risks may be heightened in the event that these projects are in foreclosure. Additionally, upon foreclosure the Fund may pay certain maintenance or operating expenses or taxes relating to such projects. These expenses may increase the overall expenses of the Fund and reduce its returns.

In addition, these projects can have more taxpayer concentration risk than general tax-supported bonds, such as general obligation bonds. Further, the fees, special taxes, or tax allocations and other revenues that are established to secure such financings generally are limited as to the rate or amount that may be levied or assessed and are not subject to increase pursuant to rate covenants or municipal or corporate guarantees. The bonds could default if development failed to progress as anticipated or if larger taxpayers failed to pay the assessments, fees and taxes as provided in the financing plans of the projects.

Ratings of Municipal Securities the Fund Buys. The Sub-Adviser may rely to some extent on credit ratings by nationally recognized statistical rating organizations in evaluating the credit risk of securities selected for the Fund's portfolio.  Credit ratings evaluate the expectation that scheduled interest and principal payments will be made in a timely manner. They do not reflect any judgment of market risk.  Ratings and market value may change from time to time, positively or negatively, to reflect new developments regarding the issuer.

Rating organizations might not change their credit rating of an issuer in a timely manner to reflect events that could affect the issuer's ability to make timely payments on its obligations. In selecting securities for its portfolio and evaluating their income potential and credit risk, the Fund does not rely solely on ratings by rating organizations but evaluates business, economic and other factors affecting issuers as well. Many factors affect an issuer's ability to make timely payments, and the credit risk of a particular security may change over time. The Sub-Adviser also may use its own research and analysis to assess those risks. If a bond is insured, it will usually be rated by the rating organizations based on the financial strength of the insurer. The rating categories are described in an Appendix to the Statement of Additional Information. 

Most of the municipal securities the Fund buys are "investment-grade" at the time of purchase. "Investment-grade" securities are those rated within the four highest rating categories of Standard & Poor's, Moody's, Fitch or another nationally recognized statistical rating organization (or, in the case of unrated securities, determined by the Sub-Adviser to be comparable to securities rated investment-grade). While securities rated within the fourth highest category by Standard & Poor's (meaning BBB+, BBB or BBB-) or by Moody's (meaning Baa1, Baa2 or Baa3) are considered "investment-grade," they have some speculative characteristics. If two or more nationally recognized statistical rating organizations have assigned different ratings to a security, the Sub-Adviser uses the highest rating assigned. 

Risks of Below-Investment-Grade Securities. Below-investment-grade securities (also referred to as "junk bonds") generally have higher yields than securities rated in the higher rating categories but also have higher risk profiles. Below-investment-grade securities are considered to be speculative and entail greater risk with respect to the ability of the issuer to timely repay principal and pay interest or dividends in accordance with the terms of the obligation and may have more credit risk than investment-grade rated securities, especially during times of weakening economic conditions or rising interest rates. These additional risks mean that the Fund may not receive the anticipated level of income from these securities, and the Fund's net asset value may be affected by declines in the value of lower-grade securities. The major risks of below-investment-grade securities include:

• Prices of below-investment-grade securities are subject to extreme price fluctuations, even under normal market conditions. Adverse changes in an issuer's industry and general economic conditions may have a greater impact on the prices of below-investment-grade securities than on the prices of higher-rated fixed-income securities.

• Below-investment-grade securities may be issued by less creditworthy issuers and may be more likely to default than investment-grade securities. Issuers of below-investment-grade securities may have more outstanding debt relative to their assets than issuers of higher-grade securities. Issuers of below-investment-grade securities may be unable to meet their interest or principal payment obligations because of an economic downturn, specific issuer developments, or the unavailability of additional financing.

• In the event of an issuer's bankruptcy, claims of other creditors may have priority over the claims of below-investment-grade securities holders.

• Below-investment-grade securities may be less liquid than higher rated fixed-income securities, even under normal market conditions. There are fewer dealers in the below-investment-grade securities market and there may be significant differences in the prices quoted by the dealers. Because they are less liquid, judgment may play a greater role in valuing certain of the Fund's securities than is the case with securities trading in a more liquid market.

• Below-investment-grade securities typically contain redemption provisions that permit the issuer of the securities containing such provisions to redeem the securities at its discretion. If the issuer redeems below-investment-grade securities, the Fund may have to invest the proceeds in securities with lower yields and may lose income.

• Below-investment-grade securities markets may be more susceptible to real or perceived adverse credit, economic, or market conditions than higher rated securities.

     The Fund can invest up to 25% of its total assets in below-investment-grade securities. This restriction is applied at the time of purchase and the Fund may continue to hold a security whose credit rating has been downgraded or, in case of an unrated security, after the Fund's Sub-Adviser has changed its assessment of the security's credit quality. As a result, credit rating downgrades or other market fluctuations may cause the Fund's holdings of below-investment-grade securities to exceed, at times significantly, this restriction for an extended period of time.  Credit rating downgrades of a single issuer or related similar issuers whose securities the Fund holds in significant amounts could substantially and unexpectedly increase the Fund's exposure to below-investment-grade securities and the risks associated with them, especially liquidity and default risk.  If the Fund has more than 25% of its total assets invested in below-investment-grade securities, the Sub-Adviser will not purchase additional below-investment-grade securities until the level of holdings in those securities no longer exceeds the restriction.

     Unrated Securities . Because the Fund purchases securities that are not rated by any nationally recognized statistical rating organization, the Sub-Adviser may internally assign ratings to those securities, after assessing their credit quality and other factors, in categories similar to those of nationally recognized statistical rating organizations. There can be no assurance, nor is it intended, that the Sub-Adviser's credit analysis process is consistent or comparable with the credit analysis process used by a nationally recognized statistical rating organization. Unrated securities are considered "investment-grade" or "below-investment-grade" if judged by the Sub-Adviser to be comparable to rated investment-grade or below-investment-grade securities. The Sub-Adviser's rating does not constitute a guarantee of the credit quality. In addition, some unrated securities may not have an active trading market or may trade less actively than rated securities, which means that the Fund might have difficulty selling them promptly at an acceptable price.

In evaluating the credit quality of a particular security, whether rated or unrated, the Sub-Adviser will normally take into consideration a number of factors including, but not limited to, the financial resources of the issuer, the underlying source of funds for debt service on a security, the issuer's sensitivity to economic conditions and trends, any operating history of the facility financed by the obligation, the degree of community support for the financed facility, the capabilities of the issuer's management, and regulatory factors affecting the issuer or the particular facility.

A reduction in the rating of a security after the Fund buys it will not require the Fund to dispose of the security. However, the Sub-Adviser will evaluate such downgraded securities to determine whether to keep them in the Fund's portfolio.

Taxability Risk. The Fund's investments in municipal securities rely on the opinion of the issuer's bond counsel that the interest paid on those securities will not be subject to federal and state income tax. Tax opinions are generally provided at the time the municipal security is initially issued. However, after the Fund buys a security, the Internal Revenue Service may determine that a bond issued as tax-exempt should in fact be taxable and the Fund's dividends with respect to that bond might be subject to federal income tax.   In addition, income from tax-exempt municipal securities could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service, state tax authorities, or a court, or the non-compliant conduct of a bond issuer.

Borrowing and Leverage.    The Fund can borrow from banks, a technique referred to as "leverage," in amounts up to one-third of the Fund's total assets (including the amount borrowed) less all liabilities and indebtedness other than borrowings. The Fund can use those borrowings for investment-related purposes such as purchasing securities believed to be desirable by the Sub-Adviser when available, funding amounts necessary to unwind or "collapse" trusts that issued "inverse floaters" to the Fund (an investment vehicle used by the Fund as described in this prospectus), or to contribute to such trusts to enable them to meet tenders of their other securities by the holders. The Fund currently participates in a line of credit with other Oppenheimer funds for those purposes.  The Fund may also borrow to meet redemption obligations or for temporary and emergency purposes.  

Borrowing for leverage will subject the Fund to greater costs (for interest payments to the lender, origination fees and related expenses) than funds that do not borrow for leverage and these other purposes.  The interest on borrowed money is an expense that might reduce the Fund's yield, especially if the cost of borrowing to buy securities exceeds the yield on the securities purchased with the proceeds of a loan.  Using leverage may also make the Fund's share price more sensitive, i.e. volatile, to interest rate changes than if the Fund did not use leverage due to the tendency to exaggerate the effect of any increase or decrease in the value of the Fund's portfolio securities.  The use of leverage may also cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or meet segregation requirements under the Investment Company Act of 1940.

Derivative Investments. The Fund can invest in different types of "derivative" instruments that are consistent with its investment strategies. A derivative is an instrument whose value depends on (or is derived from) the value of an underlying security, asset, interest rate, index or currency. Inverse floaters are the primary type of derivative the Fund can use.

Risks of Derivative Investments. Derivatives may be volatile and may involve significant risks. The underlying security, obligor or other instrument on which a derivative is based, or the derivative itself, may not perform as expected. For some derivatives, it is possible to lose more than the amount invested in the derivative investment. In addition, some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. Certain derivative investments held by the Fund may be illiquid, making it difficult to close out an unfavorable position. Derivative transactions may require the payment of premiums and can increase portfolio turnover. Derivatives are subject to credit risk, since the Fund may lose money on a derivative investment if the issuer or counterparty fails to pay the amount due. As a result of these risks, the Fund could realize little or no income or lose money from the investment, or the use of a derivative for hedging might be unsuccessful.

In addition, under U.S. financial reform legislation enacted in 2010 and currently being implemented, certain over-the-counter derivatives, including certain interest rate swaps and certain credit default swaps, are (or soon will be) required to be executed on a regulated market and cleared through a central clearing house counterparty, which may result in increased margin requirements and costs for a fund. It is unclear how these regulatory changes will affect counterparty risk, and entering into a derivative transaction with a central clearing house counterparty may entail further risks and costs, including the counterparty risk of the central clearing house counterparty and the futures commission merchant through which the fund accesses the clearing house.

The Fund may use derivatives to seek income or capital gain to hedge against the risks of other investments. Derivatives may allow the Fund to increase or decrease its exposure to certain markets or risks. Examples include, but are not limited to, interest rate swaps or municipal bond swaps. While the Fund may use derivatives for hedging purposes, it typically does not use hedging instruments, such as options, to hedge investment risks.

Inverse Floaters. The Fund may invest in inverse floaters to seek greater income and total return. Inverse floaters, under ordinary circumstances, offer higher yields and thus provide higher income than fixed-rate municipal bonds of comparable maturity and credit quality. During periods of rising interest rates, the market values of inverse floaters will tend to decline more quickly than those of fixed rate securities.

An inverse floater is created as part of a "tender option bond" transaction. In most cases, in a tender option bond transaction the Fund sells a fixed-rate municipal bond (the "underlying municipal bond") to a broker dealer (the "sponsor"). The sponsor creates a trust (the "Trust") into which it deposits the underlying municipal bond. The Trust then issues and sells short-term floating rate securities with a fixed principal amount representing a senior interest in the underlying municipal bond to third parties and the inverse floater, representing a residual, subordinate interest in the underlying municipal bond, to the Fund. The proceeds of the sale of the bond by the Fund remaining after it buys the inverse floater can be used for any purpose. The interest rate on the short-term floating rate securities resets periodically, usually weekly, to a prevailing market rate and holders of these securities are granted the option to tender their securities back to the Trust for repurchase at their principal amount plus accrued interest thereon (the "purchase price") periodically, usually daily or weekly. A remarketing agent for the Trust (typically an affiliate of the sponsor) is required to attempt to re-sell any tendered short-term floating rate securities to new investors for the purchase price. If the remarketing agent is unable to successfully re-sell the tendered short-term floating rate securities, a liquidity provider to the Trust (typically an affiliate of the sponsor) must contribute cash to the Trust to ensure that the tendering holders receive the purchase price of their securities on the repurchase date.

The Fund may also purchase an inverse floater created as part of a tender option bond transaction not initiated by the Fund when a third party, such as a municipal issuer or financial institution, transfers an underlying municipal bond to a Trust.

Because holders of the short-term floating rate securities are granted the right to tender their securities to the Trust for repurchase at frequent intervals for the purchase price, with such payment effectively guaranteed by the liquidity provider, the securities generally bear short-term rates of interest commensurate with money market instruments. When interest is paid on the underlying municipal bond to the Trust, such proceeds are first used to pay the Trust's administrative expenses and accrued interest to holders of the short-term floating rate securities, with any remaining amounts being paid to the Fund, as the holder of the inverse floater. Accordingly, the amount of such interest on the underlying municipal bond paid to the Fund is inversely related the rate of interest on the short-term floating rate securities. Additionally, because the principal amount of the short-term floating rate securities is fixed and is not adjusted in response to changes in the market value of the underlying municipal bond, any change in the market value of the underlying municipal bond is reflected entirely in a change to the value of the inverse floater.

Typically, the terms of an inverse floater grant the Fund, as holder, the right to voluntarily terminate the Trust and to obtain the underlying municipal bond. To do so, the Fund would generally need to pay the Trust the purchase price of the short-term floating rate securities and a specified portion of any market value gain on the underlying municipal bond since its deposit into the Trust. Through the exercise of such right, the Fund can "collapse" the Trust, terminate its investment in the related inverse floater and obtain the underlying municipal bond. Additionally, the Fund also typically has the right to exchange with the Trust (i) a principal amount of short-term floating rate securities held by the Fund for a corresponding additional principal amount of the inverse floater or (ii) a principal amount of the inverse floater held by the Fund for a corresponding additional principal amount of short-term floating rate securities (which are typically then sold to other investors). Through the exercise of this right, the Fund may increase (or decrease) the principal amount of short-term floating rate securities outstanding, thereby increasing (or decreasing) the amount of leverage provided by the short-term floating rate securities to the Fund's investment exposure to the underlying municipal bond.

The Fund's investments in inverse floaters involve certain risks. As short-term interest rates rise, inverse floaters produce less current income (and, in extreme cases, may pay no income) and as short-term interest rates fall, inverse floaters produce more current income. Thus, if short-term interest rates rise after the issuance of the inverse floater, any yield advantage to the Fund is reduced and may be eliminated. All inverse floaters entail some degree of leverage represented by the outstanding principal amount of the related short-term floating rate securities.

The value of, and income earned on, an inverse floater that has a higher degree of leverage (represented by a larger outstanding principal amount of related short-term floating rate securities relative to the par value of the underlying municipal bond) will fluctuate more significantly in response to changes in interest rates and to changes in the market value of the related underlying municipal bond than that of an inverse floater having a lower degree of leverage. Changes in the value of an inverse floater will also be more significant than changes in the market value of the related underlying municipal bond because the leverage provided by the related short-term floating rate security increases the sensitivity of an inverse floater to changes in interest rates and to the market value of the underlying municipal bond. An inverse floater can be expected to underperform fixed-rate municipal bonds when the difference between long-term and short-term interest rates is decreasing (or is already small) or when long-term interest rates are rising, but can be expected to outperform fixed-rate municipal bonds when the difference between long-term and short-term interest rates is increasing (or is already large) or when long-term interest rates are falling. Additionally, a tender option bond transaction typically provides for the automatic termination or "collapse" of a Trust upon the occurrence of certain adverse events, usually referred to as "mandatory tender events" or "tender option termination events." These events may include, among others, a credit ratings downgrade of the underlying municipal bond below a specified level, a decrease in the market value of the underlying municipal bond below a specified amount, a bankruptcy of the liquidity provider or the inability of the remarketing agent to re-sell to new investors short-term floating rate securities that have been tendered for repurchase. Following such an event, the underlying municipal bond is generally sold for current market value and the proceeds distributed to holders of the short-term floating rate securities and inverse floater, with the holder of the inverse floater (the Fund) generally receiving the proceeds of such sale only after the holders of the short-term floating rate securities have received proceeds equal to the purchase price of their securities (and the liquidity provider is generally required to contribute cash to the Trust only in an amount sufficient to ensure that holders of the short-term floating rates securities receive the purchase price for their securities in connection with such termination of the Trust, in which instance the Fund may have an obligation to reimburse the liquidity provider, as described below). The sale of the underlying bond following such an event could be at an adverse price that might result in the loss by the Fund of a substantial portion, or even all, of its investment in the related inverse floater.  

The Fund may enter into shortfall/reimbursement agreements with the liquidity provider in connection with certain inverse floaters held by the Fund. These agreements commit the Fund to reimburse the liquidity provider to the extent that the liquidity provider must provide cash to a Trust, including following the termination of a Trust resulting from the occurrence of a "mandatory tender event." In connection with such an event and the termination of the Trust triggered thereby, the shortfall/reimbursement agreement will make the Fund liable for the amount of the negative difference, if any, between the liquidation value of the underlying municipal bond and the purchase price of the short-term floating rate securities issued by the Trust. The Sub-Adviser monitors the Fund's potential exposure with respect to these agreements on a daily basis and intends to take action to terminate the Fund's investment in related inverse floaters, if it deems it appropriate to do so.

Accounting Treatment of Inverse Floaters . When the Fund creates an inverse floater in a tender option bond transaction by selling an underlying municipal bond to a sponsor for deposit into a Trust, the transaction is considered a secured borrowing for financial reporting purposes. As a result of such accounting treatment, the Fund includes the underlying municipal bond on its Statement of Investments and as an asset on its Statement of Assets and Liabilities (but does not separately include the related inverse floater on either). The Fund also includes a liability on its Statement of Assets and Liabilities equal to the outstanding principal amount and accrued interest on the related short-term floating rate securities issued by the Trust. Interest on the underlying municipal bond is recorded as investment income on the Fund's Statement of Operations, while interest payable on the related short-term floating rate securities is recorded as interest expense (which affects the Fund's annual operating expenses, shown earlier in this prospectus). As mentioned above, the Fund may also purchase an inverse floater created as part of a tender option bond transaction when a third party, such as a municipal issuer or financial institution, transfers an underlying municipal bond to a Trust. For financial reporting purposes, the Fund includes the inverse floater related to such transaction on its Statement of Investments and interest on the security is recorded as investment income on the Fund's Statement of Operations.

Floating Rate/Variable Rate Obligations. Some municipal securities have variable or floating interest rates. Variable rates are adjustable at stated periodic intervals. Floating rates are automatically adjusted according to a specified market rate for those investments, such as, for example, the percentage of LIBOR, the SIFMA Municipal Swap Index or the percentage of the prime rate of a bank. These obligations may be secured by bank letters of credit or other credit support arrangements. Inverse floaters, discussed in this prospectus, are a type of variable rate obligation.

Other Investment Strategies and Risks. The Fund can also use the investment techniques and strategies described below. The Fund might not use all of these techniques or strategies or might only use them from time to time.

        To seek a higher yield, the Fund also can invest in municipal securities other than those of its state. Although any interest from those securities generally would be exempt from federal taxation, any such interest may be subject to the Fund's state personal income tax. The Fund does not expect to invest a significant portion of its assets in securities that are not exempt from its state's personal income tax.

When-Issued and Delayed-Delivery Transactions. The Fund may purchase municipal securities on a "when-issued" basis and may purchase or sell such securities on a "delayed-delivery" basis. "When-issued" or "delayed-delivery" refers to securities whose terms and indenture are available and for which a market exists, but which are not available for immediate delivery. During the period between the purchase and the settlement dates, the buyer makes no payment for the security and receives no interest. When-issued or delayed-delivery securities the Fund buys are subject to changes in value as a result of market fluctuations during that period and the value of the security on the delivery date may be more or less than the Fund paid. The Fund may lose money if the value of the security has declined below the purchase price.

Percentage of LIBOR Notes (PLNs). The Fund may invest in Percentage of LIBOR Notes ("PLNs") which are variable rate municipal securities based on the London Interbank Offered Rate ("LIBOR"), a widely used benchmark for short-term interest rates and used by banks for interbank loans with other banks. A PLN typically pays interest based on a percentage of a LIBOR rate for a specified time plus an established yield premium. Due to their variable rate features, PLNs will generally pay higher levels of income in a rising short-term interest rate environment and lower levels of income as short-term interest rates decline. In times of substantial market volatility, however, PLNs may not perform as anticipated. The value of a PLN also may decline due to other factors, such as changes in credit quality of the underlying bond.

Defaulted Securities. The Fund may purchase defaulted securities if the Sub-Adviser believes that there is potential for resumption of income payments or realization of income on the sale of the securities or the collateral or other advantageous developments appear likely in the near future. Notwithstanding the Sub-Adviser's belief about the resumption of income payments or realization of income, the purchase of defaulted securities is highly speculative and involves a high degree of risk, including the risk of a substantial or complete loss of the Fund's investment. Defaulted securities are subject to the Fund's limitation on holding below-investment-grade securities. The Sub-Adviser does not expect that this will be a significant investment strategy of the Fund.

Zero-Coupon Securities.  The Fund can invest without limit in zero-coupon securities.  These debt obligations do not pay interest prior to their maturity date or else they do not start to pay interest at a stated coupon rate until a future date. They are issued and traded at a discount from their face amount. The discount varies as the securities approach their maturity date (or the date interest payments are scheduled to begin). When interest rates change, zero-coupon securities are subject to greater fluctuations in their value than securities that pay current interest. The Fund accrues the discount on zero-coupon bonds as tax-free income on a current basis. The Fund may have to pay out the imputed income on zero-coupon securities without receiving actual cash payments currently.

Illiquid Securities. Investments may be illiquid because they do not have an active trading market, making it difficult to value them or dispose of them promptly at an acceptable price. The Sub-Adviser monitors holdings of illiquid securities on an ongoing basis to determine whether to sell any holdings.

The Fund will not invest more than 15% of its net assets in illiquid securities.

Taxable Investments. The Fund can invest up to 20% of its net assets (plus borrowings for investment purposes) in investments that generate income subject to income taxes. Taxable investments include, for example, hedging instruments, repurchase agreements, and many of the types of securities the Fund would buy for temporary defensive purposes. The Fund does not anticipate investing substantial amounts of its assets in taxable investments under normal market conditions or as part of its normal trading strategies and policies. 

Temporary Defensive and Interim Investments. For temporary defensive purposes in times of adverse or unstable market, economic or political conditions, the Fund can invest up to 100% of its total assets in investments that may be inconsistent with the Fund's principal investment strategies. Generally, the Fund would invest in short-term municipal securities, but could also invest in U.S. government securities or highly-rated corporate debt securities. The Fund might also hold these types of securities as interim investments pending the investment of proceeds from the sale of Fund shares or the sale of Fund portfolio securities or to meet anticipated redemptions of Fund shares. The income from some temporary defensive investments may not be tax-exempt, and therefore to the extent the Fund invests in these securities, it might not achieve its investment objective.

Portfolio Turnover.  A change in the securities held by the Fund is known as "portfolio turnover." The Fund may engage in active and frequent trading to try to achieve its investment objective and may have a portfolio turnover rate of over 100% annually. Increased portfolio turnover may result in higher brokerage fees or other transaction costs, which can reduce performance. However, the Fund ordinarily incurs little or no brokerage expense because most of the Fund's portfolio transactions are principal trades that do not require payment of brokerage commission. If the Fund realizes capital gains when it sells investments, it generally must pay those gains to shareholders, increasing its taxable distributions. The Financial Highlights table at the end of this prospectus shows the Fund's portfolio turnover rates during past fiscal years.

Conflicts of Interest. The investment activities of the Manager, the Sub-Adviser and their affiliates in regard to other accounts they manage may present conflicts of interest that could disadvantage the Fund and its shareholders. The Manager, the Sub-Adviser or their affiliates may provide investment advisory services to other funds and accounts that have investment objectives or strategies that differ from, or are contrary to, those of the Fund. That may result in another fund or account holding investment positions that are adverse to the Fund's investment strategies or activities. Other funds or accounts advised by the Manager, the Sub-Adviser or their affiliates may have conflicting interests arising from investment objectives that are similar to those of the Fund. Those funds and accounts may engage in, and compete for, the same types of securities or other investments as the Fund or invest in securities of the same issuers that have different, and possibly conflicting, characteristics. The trading and other investment activities of those other funds or accounts may be carried out without regard to the investment activities of the Fund and, as a result, the value of securities held by the Fund or the Fund's investment strategies may be adversely affected. The Fund's investment performance will usually differ from the performance of other accounts advised by the Manager, the Sub-Adviser or their affiliates and the Fund may experience losses during periods in which other accounts they advise achieve gains. The Manager and the Sub-Adviser have adopted policies and procedures designed to address potential identified conflicts of interest, however, such policies and procedures may also limit the Fund's investment activities and affect its performance.

Changes to the Fund's Investment Policies. The Fund's fundamental investment policies cannot be changed without the approval of a majority of the Fund's outstanding voting shares; however, the Fund's Board can change non-fundamental policies without a shareholder vote. Significant policy changes will be described in supplements to this prospectus. The Fund's investment objective is a fundamental policy. Other investment restrictions that are fundamental policies are listed in the Fund's Statement of Additional Information. An investment policy is not fundamental unless this prospectus or the Statement of Additional Information states that it is.

Portfolio Holdings.  The Fund's portfolio holdings are included in its semi-annual and annual reports that are distributed to its shareholders within 60 days after the close of the applicable reporting period. The Fund also discloses its portfolio holdings in its Schedule of Investments on Form N-Q, which are public filings that are required to be made with the Securities and Exchange Commission within 60 days after the end of the Fund's first and third fiscal quarters. Therefore, the Fund's portfolio holdings are made publicly available no later than 60 days after the end of each of its fiscal quarters. In addition, the Fund's portfolio holdings information, as of the end of each calendar month, may be posted and available on the Fund's website no sooner than 30 days after the end of each calendar month.    

A description of the Fund's policies and procedures with respect to the disclosure of its portfolio holdings is available in the Fund's Statement of Additional Information.

How the Fund is Managed

THE MANAGER AND THE SUB-ADVISER. OFI Global Asset Management, Inc., the Manager, is a wholly-owned subsidiary of OppenheimerFunds, Inc. The Manager oversees the Fund's investments and its business operations. OppenheimerFunds, Inc., the Sub-Adviser, chooses the Fund's investments and provides related advisory services. The Manager carries out its duties, subject to the policies established by the Fund's Board, under an investment advisory agreement with the Fund that states the Manager's responsibilities. The agreement sets the fees the Fund pays to the Manager and describes the expenses that the Fund is responsible to pay to conduct its business. The Sub-Adviser has a sub-advisory agreement with the Manager and is paid by the Manager.

The Manager has been an investment adviser since 2012. The Sub-Adviser has been an investment adviser since 1960. The Manager and the Sub-Adviser are located at Two World Financial Center, 225 Liberty Street, 11th Floor, New York, New York 10281-1008.

Advisory Fees.   Under the investment advisory agreement, the Fund pays the Manager an advisory fee at an annual rate that declines on additional asset as the Fund grows: 0.55% of the first $500 million of average annual net assets, 0.50% of the next $500 million, 0.45% of the next $500 million and 0.40% of the average annual net assets over $1.5 billion, calculated on the daily net assets of the Fund. Under the sub-advisory agreement, the Manager pays the Sub-Adviser a percentage of the net investment advisory fee (after all applicable waivers) that it receives from the Fund as compensation for the provision of the investment advisory services. The Fund's advisory fee for the fiscal year ended March 31, 2013 was 0.55% of average annual net assets, before any applicable waivers.

After discussions with the Fund's Board of Trustees, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit "Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement" (excluding (i) interest and fees from borrowing, interest and related expenses from inverse floaters, taxes, dividends tied to short sales, brokerage commissions, and other expenditures which are capitalized in accordance with generally accepted accounting principles; (ii) expenses incurred directly or indirectly by the Fund as a result of investments in other investment companies, wholly-owned subsidiaries and pooled investment vehicles; (iii) certain other expenses attributable to, and incurred as a result of, a Fund's investments; and (iv) other extraordinary expenses (including litigation expenses) not incurred in the ordinary course of the Fund's business) to annual rates of 0.80% for Class A, 1.55% for Class B and Class C, and 0.80% for Class Y, as calculated on the daily net assets of the Fund. This fee waiver and/or expense reimbursement may not be amended or withdrawn for one year from the date of this prospectus.

The Total Annual Fund Operating Expenses shown in the Annual Fund Operating Expenses table earlier in this prospectus include certain interest and related expenses from the Fund's investment in inverse floaters. Under accounting rules, the Fund recognized additional income in an amount that offsets those expenses. Therefore, the Fund's total expenses and net asset values were not affected. If the interest and related expenses from the Fund's investment in inverse floaters were excluded (after applying the Manager's voluntary fee waiver/reimbursement), the expense ratios for the Fund would be 0.90% for Class A, 1.65% for Class B and Class C, and 0.81% for Class Y. The Fund's annual operating expenses may vary in future years.

A discussion regarding the basis for the Board of Trustees' approval of the investment advisory arrangements for the Fund is available in the Fund's Semi-Annual Report to shareholders for the period ended September 30, 2012.

Portfolio Managers. The Fund's portfolio is managed by a team of investment professionals, including Daniel G. Loughran, CFA, Scott S. Cottier, CFA, Troy E. Willis, J.D., CFA, Mark R. DeMitry, CFA, Michael L. Camarella, CFA, Charles S. Pulire, CFA, and Elizabeth S. Mossow, CFA, who are primarily responsible for the day-to-day management of the Fund's investments. Messrs. Loughran, Cottier and Willis have each been portfolio managers and Vice Presidents of the Fund since its inception. Mr. DeMitry has been a portfolio manager of the Fund since inception and a Vice President of the Fund since June 2009.  Mr. Camarella has been a portfolio manager of the Fund since January 2008 and a Vice President of the Fund since June 2009.  Mr. Pulire has been a portfolio manager of the Fund since December 2010 and a Vice President of the Fund since September 2011. Mrs. Mossow has been an associate portfolio manager of the Fund since July 2013.

Mr. Loughran has been a Senior Vice President of the Sub-Adviser since July 2007 and a Senior Portfolio Manager of the Sub-Adviser since December 2001.  He was a Vice President of the Sub-Adviser from April 2001 to June 2007.  Mr. Loughran is a team leader, a portfolio manager, an officer, and a trader for the Fund and other Oppenheimer funds.

Mr. Cottier has been a Vice President and Senior Portfolio Manager of the Sub-Adviser since September 2002.  Mr. Cottier is a portfolio manager, an officer, and a trader for the Fund and other Oppenheimer funds.

Mr. Willis has been a Vice President of the Sub-Adviser since July 2009 and a Senior Portfolio Manager of the Sub-Adviser since January 2006.  He was an Assistant Vice President of the Sub-Adviser from July 2005 to June 2009 and an Associate Portfolio Manager of the Sub-Adviser from June 2003 to December 2005.  Mr. Willis is a portfolio manager, an officer, and a trader for the Fund and other Oppenheimer funds.

Mr. DeMitry has been a Vice President and Senior Portfolio Manager of the Sub-Adviser since July 2009.  He was an Associate Portfolio Manager with the Sub-Adviser from September 2006 to June 2009.  He was a Research Analyst with the Sub-Adviser from June 2003 to August 2006. He was a Credit Analyst with the Sub-Adviser from July 2001 to May 2003. Mr. DeMitry is a portfolio manager, an officer and a trader for the Fund and other Oppenheimer funds.

Mr. Camarella has been a Vice President and Senior Portfolio Manager of the Sub-Adviser since January 2011. He was an Assistant Vice President of the Sub-Adviser from July 2009 to December 2010 and an Associate Portfolio Manager with the Sub-Adviser from January 2008 to December 2010. He was a Research Analyst with the Sub-Adviser from April 2006 to December 2007. He was a Credit Analyst with the Sub-Adviser from June 2003 to March 2006. Mr. Camarella is a portfolio manager, an officer and a trader for the Fund and other Oppenheimer funds.

Mr. Pulire has been a Vice President and Senior Portfolio Manager of the Sub-Adviser since February 2013.  He was an Assistant Vice President and an Associate Portfolio Manager of the Sub-Adviser from December 2010 to January 2013. He was a Research Analyst with the Sub-Adviser from February 2008 to November 2010 and was a Credit Analyst with the Sub-Adviser from May 2006 to January 2008. Mr. Pulire is a portfolio manager, an officer and a trader for the Fund and other Oppenheimer funds.

Mrs. Mossow has been an Assistant Vice President of the Sub-Adviser since January 2011 and an Associate Portfolio Manager of the Sub-Adviser since June 2013.  She was a Portfolio Research Analyst of the Sub-Adviser from June 2011 to June 2013 and was a Credit Analyst of the Sub-Adviser from May 2007 to May 2011. She was a Risk Management Analyst at Manning & Napier Associates from September 2006 to May 2007 and was an Analyst/Trading Assistant at The Baupost Group from August 2000 to March 2006. Mrs. Mossow is a portfolio manager and a trader for the Fund and other Oppenheimer funds.

     The Statement of Additional Information provides additional information about portfolio manager compensation, other accounts managed and ownership of Fund shares.

MORE ABOUT YOUR ACCOUNT

About Your Account

Where Can You Buy Fund Shares? Oppenheimer funds may be purchased either directly or through a variety of "financial intermediaries" that offer Fund shares to their clients. Financial intermediaries include securities dealers, financial advisers, brokers, banks, trust companies, insurance companies and the sponsors of fund "supermarkets," fee-based advisory or wrap fee programs.

Certain sales charge waivers may apply to purchases or redemptions of Class A, Class B, or Class C shares. More information about those waivers is available in the Fund's Statement of Additional Information, or by clicking on the hyperlink "Sales Charge Waivers" under the heading "Fund Information" on the OppenheimerFunds website at "www.oppenheimerfunds.com."

What is the Minimum Investment?  In most cases, you can buy Fund shares with a minimum initial investment of $1,000 and make additional investments with as little as $50. The minimum additional investment requirement does not apply to reinvested dividends from the Fund or from other Oppenheimer funds or to omnibus account purchases. A $25 minimum applies to additional investments through an Asset Builder Plan, an Automatic Exchange Plan or a government allotment plan established before November 1, 2002. Reduced initial minimums are available in certain circumstances, including under the following investment plans: 

• For an Asset Builder Plan or Automatic Exchange Plan or a government allotment plan, the minimum initial investment is $500.

• For certain fee based programs that have an agreement with the Distributor, a minimum initial investment of $250 applies.

• The minimum purchase amounts listed do not apply to omnibus accounts.

Minimum Account Balance. A $12 annual "minimum balance fee" is assessed on Fund accounts with a value of less than $500. The fee is automatically deducted from each applicable Fund account annually in September. See the Statement of Additional Information for information about the circumstances under which this fee will not be assessed. Small accounts may be involuntarily redeemed by the Fund if the value has fallen below $500 for reasons other than a decline in the market value of the shares.