497K 1 corebondfund.htm

OPPENHEIMER

Core Bond Fund

Summary Prospectus March 30, 2010

NYSE Ticker Symbols
Class A	OPIGX
Class B	OIGBX
Class C	OPBCX
Class N	OPBNX
Class Y	OPBYX

Before you invest, you may want to review the Fund's prospectus, which contains more information about the Fund and its risks. You can find the Fund's prospectus, Statement of Additional Information, Annual Report and other information about the Fund online at https://www.oppenheimerfunds.com/fund/investors/overview/CoreBondFund. You can also get this information at no cost by calling 1.800.225.5677 or by sending an email request to: info@oppenheimerfunds.com.

The Fund's prospectus and Statement of Additional Information ("SAI"), both dated March 30, 2010, and pages 9 through 29 of its most recent Annual Report, dated December 31, 2009, are incorporated by reference into this Summary Prospectus. You can access the Fund's prospectus and SAI at https://www.oppenheimerfunds.com/fund/investors/overview/CoreBondFund. The Fund's prospectus is also available from financial intermediaries who are authorized to sell Fund shares.

Investment Objective. The Fund seeks total return by investing mainly in debt instruments.

Fees and Expenses of the Fund. The table below describes the fees and expenses that you may pay if you buy and hold or redeem shares of the Fund. You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $50,000 in certain funds in the Oppenheimer family of funds. More information about these and other discounts is available from your financial professional and in the section "About Your Account" beginning on page 24 of the prospectus and in the sections "How to Buy Shares" beginning on page 54 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)
	Class A Shares	Class B Shares	Class C Shares	Class N Shares	Class Y Shares
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	4.75%	None	None	None	None
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	None	5%	1%	1%	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
	Class A Shares	Class B Shares	Class C Shares	Class N Shares	Class Y Shares
Management Fees	0.48%	0.48%	0.48%	0.48%	0.48%
Distribution and/or Service (12b-1) Fees	0.25%	1.00%	1.00%	0.50%	n/a
Other Expenses	0.44%	0.95%	0.49%	0.58%	0.14%
Acquired Fund Fees and Expenses	0.02%	0.02%	0.02%	0.02%	0.02%
Total Annual Fund Operating Expenses	1.19%	2.45%	1.99%	1.58%	0.64%
Fee Waiver and Expense Reimbursements*	(0.04)%	(0.50)%	(0.09)%	(0.19)%	(0.02)%
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement	1.15%	1.95%	1.90%	1.39%	0.62%

*The Manager has voluntarily agreed to waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund's investment in Oppenheimer Institutional Money Market Fund. The Fund's transfer agent has voluntarily agreed to limit its fees for all classes to 0.35% of average annual net assets per class. Each of these undertakings may be amended or withdrawn after one year from the date of this prospectus.

Examples. The following examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The examples assume that you invest $10,000 in a class of shares of the Fund for the time periods indicated. The examples also assume that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your expenses would be as follows:

	If shares are redeemed											If shares are not redeemed
	1 Year		3 Years			5 Years			10 Years			1 Year		3 Years		5 Years		10 Years
Class A Shares	$	587		$	833		$	1,098		$	1,854	$	587	$	833	$	1,098		$	1,854
Class B Shares	$	700		$	1,024		$	1,475		$	2,165	$	200	$	724	$	1,275		$	2,165
Class C Shares	$	295		$	622		$	1075		$	2,332	$	195	$	622	$	1075		$	2,332
Class N Shares	$	242		$	484		$	849		$	1,877	$	142	$	484	$	849		$	1,877
Class Y Shares	$	64		$	203		$	356		$	799	$	64	$	203	$	356		$	799

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 examples, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 115% of the average value of its portfolio.

Principal Investment Strategies. Under normal market conditions, the Fund invests at least 80% of its net assets, plus borrowings for investment purposes, in investment-grade debt securities (generally referred to as "bonds"). A debt security is a security representing money borrowed by the issuer that must be repaid. The terms of a debt security specify the amount of principal, the interest rate or discount, and the time or times at which payments are due. Debt securities can include:

Domestic and foreign corporate debt obligations;
Domestic and foreign government debt obligations, including U.S. Government securities;
Mortgage-related securities;
Asset-backed securities; and
Other debt obligations.

The portfolio managers' overall strategy is to build a diversified portfolio of corporate and government bonds. The Fund's investments in U.S. Government securities may include securities issued or guaranteed by the U.S. Government or its agencies or federally-chartered entities referred to as "instrumentalities." There is no required allocation of the Fund's assets among the above classes of securities, but the Fund focuses mainly on U.S. Government securities and investment-grade corporate debt securities. When market conditions change, the portfolio managers might change the Fund's relative asset allocation.

The Fund can invest up to 20% of its total assets in lower-grade, high-yield debt securities that are below investment-grade (commonly referred to as "junk bonds"). "Investment-grade" debt securities are rated in one of the top four categories by nationally recognized statistical rating organizations such as Moody's or Standard & Poor's. The Fund may also invest in unrated securities, in which case the Manager may internally assign ratings to certain of those securities, after assessing their credit quality, in categories similar to those of nationally recognized statistical rating organizations.

The Fund has no limitations on the range of maturities of the debt securities in which it can invest and may hold securities with short-, medium- or long-term maturities. The maturity of a security differs from its effective duration, which attempts to measure the expected volatility of a security's price. Duration is inversely related to 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 decrease about 3%. To try to decrease volatility, the Fund seeks to maintain an average effective portfolio duration of three to six years, measured on a dollar-weighted basis. However, the duration of the portfolio might not meet that target due to market events or interest rate changes that cause debt securities to be repaid more rapidly or more slowly than expected.

The Fund may invest a portion of its assets in foreign debt securities, including securities issued by foreign governments or companies in both developed and emerging markets. The Fund may not invest more than 20% of its net assets in foreign debt securities.

The Fund may also use derivatives to seek increased returns or to try to manage investment risks. Options, futures, forward contracts, swaps, zero-coupon and stripped securities, "structured" notes, and certain mortgage-related securities, are examples of the types of derivatives the Fund can use.

In selecting investments for the Fund, the portfolio managers analyze the overall investment opportunities and risks in different sectors of the debt securities markets by focusing on business cycle analysis and relative values between the corporate and government sectors. The Fund mainly seeks income earnings on the Fund's investments plus capital appreciation that may arise from decreases in interest rates, from improving credit fundamentals for a particular sector or security or from other investment techniques.

The Fund may sell securities that the portfolio managers believe no longer meet the above criteria.

Principal Risks. The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or from poor security selection, which could cause the Fund to underperform other funds with similar objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, prepayment risk and extension 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. If an issuer fails to pay interest or repay principal, the Fund's income or share value might be reduced. Adverse news about an issuer or a downgrade in an issuer's credit rating, for any reason, can also reduce the market value of the issuer's securities. Interest rate risk is the risk that when prevailing interest rates fall, the values of already-issued debt securities generally rise; and when prevailing interest rates rise, the values of already-issued debt securities generally fall, and may be worth less than the amount the Fund paid for them. When interest rates change, the values of longer-term debt securities usually change more than the values of shorter-term debt securities. When interest rates fall, the issuers of debt securities may repay principal more quickly than expected and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as "prepayment risk." When interest rates rise, debt securities may be repaid more slowly than expected and the value of the Fund's holdings may fall sharply. This is referred to as "extension risk." Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates.

Special Risks of Lower-Grade Securities. Lower-grade securities may be subject to wider market fluctuation, greater credit risk and greater risk of loss of income and principal than investment-grade securities. The market for lower-grade securities may be less liquid and therefore they may be harder to sell at an acceptable price, especially during times of market volatility or decline.

Because the Fund can invest up to 20% of its total assets in lower-grade securities, the Fund's credit risks are greater than those of funds that buy only investment-grade securities.

Fixed Income Market Risks. Developments relating to subprime mortgages have adversely affected fixed-income securities markets in the United States, Europe and elsewhere. The values of many types of debt securities have been reduced, including debt securities that are not related to mortgage loans. These developments have reduced the willingness of some lenders to extend credit and have made it more difficult for borrowers to obtain financing on attractive terms or at all. In addition, broker-dealers and other market participants have been less willing to make a market in some types of debt instruments, which has impacted the liquidity of those instruments. These developments also have had a negative effect on the broader economy. There is a risk that the lack of liquidity or other adverse credit market conditions may hamper the Fund's ability to sell the debt securities in which it invests or to find and purchase suitable debt instruments.

Risks of Foreign Investing. Foreign securities are subject to special risks. Foreign issuers are usually not subject to the same accounting and disclosure requirements that U.S. companies are subject to, which may make it difficult for the Fund to evaluate a foreign company's operations or financial condition. A change in the value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of securities denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those securities. The value of foreign investments may be affected by exchange control regulations, foreign taxes, higher transaction and other costs, delays in settlement of transactions, changes in economic or monetary policy in the United States or abroad, expropriation or nationalization of a company's assets, or other political and economic factors. These risks may be greater for investments in developing or emerging market countries.

Special Risks of Developing and Emerging Markets. The economies of developing or emerging market countries may be more dependent on relatively few industries that may be highly vulnerable to local and global changes. The governments of developing and emerging market countries may also be more unstable than the governments of more developed countries. These countries generally have less developed securities markets or exchanges, and legal and accounting systems. Securities may be more difficult to sell at an acceptable price and may be more volatile than securities in countries with more mature markets. The value of developing or emerging market currencies may fluctuate more than the currencies of countries with more mature markets. Investments in developing or emerging market countries may be subject to greater risks of government restrictions, including confiscatory taxation, expropriation or nationalization of a company's assets, restrictions on foreign ownership of local companies and restrictions on withdrawing assets from the country. Investments in companies in developing or emerging market countries may be considered speculative.

Risks of Derivative Investments. Derivatives may be volatile and may involve significant risks. The underlying security or other instrument on which a derivative is based, or the derivative itself, may not perform as expected. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. The Fund may also lose money on a derivative investment if the issuer fails to pay the amount due. 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. As a result of these risks, the Fund could realize little or no income or lose money from its investment, or a hedge might be unsuccessful.

Who Is the Fund Designed For? The Fund is designed primarily for investors seeking total return from a fund that invests mainly in investment-grade debt securities but which can also hold high-yield, below investment-grade securities. Those investors should be willing to assume the credit risks of a fund that typically invests a significant amount of its assets in corporate debt securities and the changes in debt securities prices that can occur when interest rates change. The Fund is intended to be a long-term investment, not a short term trading vehicle. The Fund is not a complete investment program. You should carefully consider your own investment goals and risk tolerance before investing in the Fund.

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund's Past Performance. The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website at:
https://www.oppenheimerfunds.com/fund/investors/overview/CoreBondFund.

Sales charges and taxes are not included and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 8.88% (3rd quarter '09) and the lowest return was -26.30% (4th quarter '08).

The following table shows the average annual total returns for each class of the Fund's shares. After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes. Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Average Annual Total Returns for the periods ended December 31, 2009	1 Year	5 Years	10 Years (or life of class, if less)
Class A Shares (inception 4-15-88)
Return Before Taxes	2.19%	(5.96)%	0.18%
Return After Taxes on Distributions	(0.29)%	(7.76)%	(1.83)%
Return After Taxes on Distributions and Sale of Fund Shares	1.29%	(5.82)%	(0.91)%
Class B Shares (inception 5-3-93)	1.49%	(6.05)%	0.23%
Class C Shares (inception 7-11-95)	5.49%	(5.74)%	(0.07)%
Class N Shares (inception 3-1-01)	6.02%	(5.28)%	(0.54)%
Class Y Shares (inception 4-27-98)	7.44%	(4.74)%	1.11%
Barclays Capital U.S. Aggregate Bond Index	5.93%	4.97%	6.33%
(reflects no deduction for fees, expenses or taxes)			5.57%¹
Barclays Capital Credit Index	16.04%	4.67%	6.64%
(reflects no deduction for fees, expenses or taxes)			6.03%¹
Citigroup Broad Investment Grade Bond Index	5.06%	5.22%	6.47%
(reflects no deduction for fees, expenses or taxes)			5.73%¹

1. From 2-28-01

Investment Adviser. OppenheimerFunds, Inc. is the Fund's investment adviser (the "Manager").

Portfolio Managers. Krishna Memani and Peter A. Strzalkowski are Vice Presidents of the Fund and have been portfolio managers for the Fund since April 2009.

Purchase and Sale of Fund Shares. 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. For certain investment plans and retirement accounts, the minimum initial investment is $500 and, for some, the minimum additional investment is $25. For certain fee based programs the minimum initial investment is $250.

Shares may be purchased through a financial intermediary or the Distributor or redeemed through a financial intermediary or the transfer agent on days the New York Stock Exchange is open for trading. Shareholders may purchase or redeem shares by mail, through the website at www.oppenheimerfunds.com or by calling 800.225.5677. Share transactions may be paid by check, by Federal funds wire or directly from or into your bank account. The Fund also offers a checkwriting privilege.

Taxes. If your shares are not held in a tax-deferred account, Fund distributions are subject to federal income tax as ordinary income or as capital gains and they may also be subject to state or local taxes.

Payments to Broker-Dealers and Other Financial Intermediaries. If you purchase Fund shares through a broker-dealer or other financial intermediary (such as a bank), the Fund, the Manager, or their related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.

For More Information About Oppenheimer Core Bond Fund

You can access the Fund's prospectus and SAI at https://www.oppenheimerfunds.com/fund/investors/overview/CoreBondFund. You can also request additional information about the Fund or your account:

By Telephone:	Call OppenheimerFunds Services toll-free: 1.800.CALL OPP (225.5677)
By Mail:	For requests by mail: OppenheimerFunds Services P.O. Box 5270 Denver, Colorado 80217-5270	For courier or express mail requests: OppenheimerFunds Services 12100 East Iliff Avenue, Suite 300 Aurora, Colorado 80014
On the Internet:	You can read or download information on the OppenheimerFunds website at: www.oppenheimerfunds.com

PR0285.001.0310