497K 1 mmffiling.htm

Oppenheimer Money Market Fund

Supplement dated December 6, 2013 to the Summary Prospectus

This supplement amends the Summary Prospectus of Oppenheimer Money Market Fund (the “Fund”) dated October 28, 2013, and is in addition to any other supplement(s).

Effective February 3, 2014:

The section titled “Purchase and Sale of Fund Shares” is deleted in its entirety and replaced by the following:

Purchase and Sale of Fund Shares. You can buy most classes of Fund shares with a minimum initial investment of $1,000. Traditional and Roth IRA, Asset Builder Plan, Automatic Exchange Plan and government allotment plan accounts may be opened with a minimum initial investment of $500. For wrap fee-based programs, salary reduction plans and other retirement plans and accounts, there is no minimum initial investment. Once your account is open, subsequent purchases may be made in any amount. Shares may be purchased through a financial intermediary or the Distributor and 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 1.800.225.5677. 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.

Effective July 1, 2014:

All references to Class N are deleted and replaced with references to Class R, in connection with the re-naming of Class N as Class R.

December 6, 2013 PS0200.026

OPPENHEIMER

Money Market Fund

Summary Prospectus October 28, 2013

NYSE Ticker Symbols
Class A	OMBXX
Class Y	OMYXX

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/MoneyMarketFund. 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 October 28, 2013, and through page 39 of its most recent Annual Report, dated July 31, 2013, are incorporated by reference into this Summary Prospectus. You can access the Fund's prospectus and SAI at https://www.oppenheimerfunds.com/fund/MoneyMarketFund. The Fund's prospectus is also available from financial intermediaries who are authorized to sell Fund shares.

Investment Objective. The Fund seeks income consistent with stability of principal.

Fees and Expenses of the Fund. This table 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 $25,000 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 10 of the prospectus and in the sections "How to Buy Shares" beginning on page 36 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees. The Fund does not charge any initial sales charge to buy shares or to reinvest dividends. There are no exchange fees or redemption fees and no contingent deferred sales charges (unless you buy Fund shares by exchanging Class A shares of other Oppenheimer funds that were purchased subject to a contingent deferred sales charge).

Annual Fund Operating Expenses¹ (expenses that you pay each year as a percentage of the value of your investment)
	Class A	Class Y
Management Fees	0.41%	0.41%
Distribution and/or Service (12b-1) Fees	None	None
Other Expenses	0.23%	0.23%
Total Annual Fund Operating Expenses	0.64%	0.64%

1. Expenses have been restated to reflect current fees.

Example. The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in a class of shares of the Fund for the time periods indicated. The Example also assumes 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	$	66	$	206	$	358	$	801	$	66	$	206	$	358	$	801
Class Y	$	66	$	206	$	358	$	801	$	66	$	206	$	358	$	801

Principal Investment Strategies. The Fund is a money market fund that invests in a variety of money market instruments to seek current income. Money market instruments are short-term, high-quality, dollar-denominated debt instruments issued by the U.S. Government, domestic and foreign corporations and financial institutions, and other entities. Money market instruments include commercial paper, bank obligations, asset-backed securities, repurchase agreements, and other short-term corporate and governmental debt obligations.

To be considered "high-quality," a debt instrument must be rated in one of the two highest credit-quality categories for short-term securities by a nationally recognized statistical rating service or, if a security is unrated, it must be determined by the Fund's investment sub-adviser, OppenheimerFunds, Inc. (the "Sub-Adviser"), under the supervision of the Fund's Board, to be of comparable quality to rated securities in one of those two categories.

Principal Risks. All investments carry risks to some degree. The Fund's investments are subject to changes in their value from a number of factors. However, the Fund's investments must meet strict standards set by its Board of Trustees and special rules under Federal law for money market funds. Those requirements include maintaining high credit quality, a short average maturity and diversification of the Fund's investments among issuers. Those provisions are designed to help minimize credit risks, to reduce the effects of changes in prevailing interest rates and to reduce the effect on the Fund's portfolio of a default by any one issuer. Since income on short-term securities tends to be lower than income on longer-term debt securities, the Fund's yield will likely be lower than the yield on longer-term fixed-income funds.

Even so, there are risks that an issuer of an obligation that the Fund holds might have its credit rating downgraded or might default on its obligations, or that interest rates might rise sharply, causing the value of the Fund's investments to fall. Also, there is the risk that the value of your investment could be eroded over time by the effects of inflation, or that poor security selection could cause the Fund to underperform other funds that have a similar objective. If there is an unexpectedly high demand for the redemption of Fund shares, the Fund might need to sell portfolio securities prior to their maturity, possibly at a loss. As a result, there is a risk that the Fund's shares could fall below $1.00 per share.

Main Risks of Money Market Instruments. Money market instruments may be subject to interest rate risk, credit risk, extension risk, reinvestment risk, prepayment risk, and event risk. 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 they 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. Risks associated with rising interest rates are heightened given that interest rates in the U.S. are at, or near, historic lows. 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. Extension risk is the risk that an increase in interest rates could cause principal payments on a debt security to be repaid at a slower rate than expected. 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 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 is the risk that the issuer may redeem the security prior to the expected maturity or that borrowers may repay the loans that underlie these securities more quickly than expected, thereby causing the issuer of the security to repay the principal prior to the expected maturity. The Fund may need to reinvest the proceeds at a lower interest rate, reducing its income. Event risk is the risk that an issuer could be subject to an event, such as a buyout or debt restructuring, that interferes with its ability to make timely interest and principal payments and cause the value of its debt securities to fall.

Interest Rate Risk. The values of debt securities usually change when prevailing interest rates change. When interest rates fall, the values of already-issued debt securities generally rise. When interest rates rise, the values of already-issued debt securities generally fall. The values of longer-term debt securities usually change more when interest rates change than the values of shorter-term debt securities.

When interest rates are low, the Fund's expenses could absorb much or all of the Fund's income. However, if interest rates increase, the Fund's income may not increase proportionately; for example, the Manager may decide to recapture fees and expenses that were previously waived or reimbursed.

Credit Risk. Debt securities are also subject to credit risk, which is the risk that the issuer of a security might not make principal or interest payments on the security when they are due. If the issuer fails to pay interest, the Fund's income might be reduced, and if the issuer fails to pay interest or repay principal, the value of the security might fall.

Fixed-Income Market Risks. Economic and other market developments can adversely affect fixed-income securities markets in the United States, Europe and elsewhere. At times, participants in debt securities markets may develop concerns about the ability of certain issuers of debt securities to make timely principal and interest payments, or they may develop concerns about the ability of financial institutions that make markets in certain debt securities to facilitate an orderly market. Those concerns can cause increased volatility in those debt securities or debt securities markets. Under some circumstances, as was the case during the latter half of 2008 and early 2009, those concerns could cause reduced liquidity in certain debt securities markets. A 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.

Bank Obligations Risk. Bank obligations are subject to risks generally applicable to debt securities, as well as to the risk of negative events affecting the banking industry. Obligations of foreign banks and foreign branches of U.S. banks are subject to additional risks, including negative political and economic developments in the country in which the bank or branch is located and actions by a foreign government that might adversely affect the payment of principal and interest on such obligations, such as the seizure or nationalization of foreign deposits. Additionally, U.S. and state banking laws and regulations may not apply to foreign branches of U.S. banks, and generally do not apply to foreign banks.

Asset-Backed Securities Risk. Asset-backed securities are subject to interest rate risk and credit risk. These securities are subject to the risk of default by the issuer as well as by the borrowers of the underlying loans in the pool, particularly during periods of economic downturn. Certain asset-backed securities are subject to prepayment and extension risks.

Repurchase Agreements Risk. Although repurchase agreements must be fully collateralized, if the Fund's counterparty defaults on its obligations under the agreement, the Fund may suffer delays and incur costs or lose money in exercising its rights under the agreement.

Regulatory Risk. In June 2013, the SEC proposed reforms to money market fund regulation, which, if adopted, may affect the Fund's operations and/or return potential.

Yield Risk. During periods of extremely low short-term interest rates, the Fund may not be able to maintain a positive yield.

Who Is the Fund Designed For? The Fund is designed for investors who want to seek income consistent with stability of principal and to maintain easy access to their investment through checkwriting and wire redemption privileges. The Fund will invest in a variety of money market instruments and try to maintain a stable share price of $1.00. The Fund is not a complete investment program.

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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund.

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 for Class A Shares from calendar year to calendar year and by showing the Fund's average annual returns for the periods of time shown in the table. The Fund's past investment performance 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/MoneyMarketFund

During the period shown, the highest return for a calendar quarter was 1.22% (3rd Qtr 07) and the lowest return was 0.00% (most recently in 3rd Qtr 12). For the period from from January 1, 2013 through September 30, 2013, the cumulative return before taxes was 0.01%.

Average Annual Total Returns for the periods ended December 31, 2012
	1 Year	5 Years	10 Years (or life of class, if less)
Class A Shares (inception 04/17/74)	0.01%	0.59%	1.62%
Class Y Shares (inception 08/27/04)	0.01%	0.63%	1.94%

The Fund's performance reflects reinvestment of all dividends and capital gains distributions.

The total returns are not the Fund's current yield. The Fund's yield more closely reflects the Fund's current earnings. To obtain the Fund's current 7-day yield information, please call the Transfer Agent toll-free at 1.800.CALL OPP (225.5677).

Investment Adviser. OFI Global Asset Management, Inc. (the "Manager") is the Fund's investment adviser. OppenheimerFunds, Inc. (the "Sub-Adviser") is its sub-adviser.

Portfolio Managers. Christopher Proctor, CFA, has been a portfolio manager and Vice President of the Fund since May 2010 and Adam Wilde, CFA, has been a portfolio manager and Vice President of the Fund since July 2013.

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 and 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 1.800.225.5677. 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. The Fund intends to declare dividends from its net investment income on each regular business day and to pay those dividends to shareholders monthly. To maintain a net asset value of $1.00 per share, the Fund might withhold dividends or make distributions from capital or capital gains. If your shares are not held in a tax-deferred account, Fund distributions are subject to federal income tax and may be subject to state or local taxes, whether taken in cash or reinvested. The Fund normally holds its securities to maturity and therefore will not usually pay capital gains. The Fund may realize capital gains on the sale of portfolio securities, however, in which case it may make distributions out of any net short-term or long-term capital gains annually.

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 Sub-Adviser, 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 Money Market Fund, Inc.

You can access the Fund's prospectus and SAI at https://www.oppenheimerfunds.com/fund/MoneyMarketFund. 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
The Fund's shares are distributed by OppenheimerFunds Distributor, Inc.

PR0200.001.1013