UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT

INVESTMENT COMPANIES

Investment Company Act file number 811-2454

Oppenheimer Money Market Fund

(Exact name of registrant as specified in charter)

6803 South Tucson Way, Centennial, Colorado 80112-3924

(Address of principal executive offices)  (Zip code)

Cynthia Lo Bessette

OFI Global Asset Management, Inc.

225 Liberty Street, New York, New York 10281-1008

(Name and address of agent for service)

Registrant’s telephone number, including area code: (303) 768-3200

Date of fiscal year end:  July 31

Date of reporting period:  7/31/2016

Item 1.  Reports to Stockholders.

Annual Report	7/31/2016
Oppenheimer Money Market Fund*
*On September 28, 2016, the Fund  will change its name to Oppenheimer Government Money Market Fund

Table of Contents

Fund Performance Discussion	3
Portfolio Allocation and Performance	4
Fund Expenses	6
Statement of Investments	8
Statement of Assets and Liabilities	13
Statement of Operations	14
Statements of Changes in Net Assets	15
Financial Highlights	16
Notes to Financial Statements	18
Report of Independent Registered Public Accounting Firm	28
Federal Income Tax Information	29
Portfolio Proxy Voting Policies and Guidelines; Updates to Statement of Investments	30
Trustees and Officers	31
Privacy Policy Notice	38

2      OPPENHEIMER MONEY MARKET FUND

Fund Performance Discussion

While the Federal Reserve (the “Fed”) rate hike in December now seems to be a distant memory, rates in 2016 continue to inch higher with the month of July being the most favorable. For example, 1-month London InterBank Offered Rate (“LIBOR”) at the end of July was at a level last witnessed in the first half of 2009. U.S. Treasury yields on the other hand continue to ebb and flow with the 2-year reaching a year-to-date low on July 5, 2016.

FUND REVIEW

The October 14, 2016, deadline for complying with the money market fund reform (the “Reform Rules”) adopted by the Securities and Exchange Commission (SEC) in July 2014 is fast approaching. We have discussed in prior reports the notable changes. In analyzing the Reform Rules, while factoring in feedback from our clients, the Fund’s name will change from Oppenheimer Money Market Fund to Oppenheimer Government Money Market Fund on September 28, 2016. Please see the Fund’s prospectus for additional information.

Throughout the reporting period, the Fund continued to offer very strong liquidity, while providing competitive income. The weighted average maturity (WAM) of the Fund remained slightly longer than its peers (approximately 32 days). While we have a longer WAM when compared to other

Prime Money Market funds, we are short our Government Money Market fund peers. We expect to continue to layer in Government securities in anticipation of our conversion date in September; therefore, WAM should continue to move higher and more in line to peers.

STRATEGY & OUTLOOK

As mentioned earlier, for the month of July, the 1-month and 3-month LIBOR witnessed a steady increase. While earlier increases in LIBOR this year were attributed to Fed Chair Yellen, most recent moves can be associated with the Reform Rules coming into effect on October 14, 2016 as supply and demand are misaligned. With conversion to Oppenheimer Government Money Market Fund on September 28, we began to transition the Fund during the reporting period while anticipating one more rate hike this year.

	Christoper Proctor, CFA Portfolio Manager

	Adam S. Wilde, CFA Portfolio Manager

3      OPPENHEIMER MONEY MARKET FUND

Portfolio Allocation

PORTFOLIO ALLOCATION

Short-Term Notes/Commercial Paper	39.2%
Certificates of Deposit	20.0
U.S. Government Agencies	18.3
Direct Bank Obligations	13.0
Repurchase Agreements	9.5

Portfolio holdings and allocations are subject to change. Percentages are as of July 31, 2016, and are based on the total market value of investments.

Performance

CURRENT YIELD

For the 7-Day Period Ended 7/31/16

	With Compounding	Without Compounding
Class A (OMBXX)	0.01%	0.01%
Class Y (OMYXX)	0.01	0.01

CURRENT YIELD

For the Year Ended 7/31/16

	With Compounding	Without Compounding
Class A (OMBXX)	0.01%	0.01%
Class Y (OMYXX)	0.01	0.01

Compounded yields assume reinvestment of dividends. The seven-day yield without compounding is an annualized average daily yield of the Fund for the most recent seven days. The compounded seven-day average yield for 365 days is offered as a comparison to a savings account’s compounded interest rate. Unlike an investment in the Fund, the FDIC generally insures deposits in savings accounts.

Performance data quoted represents past performance, which does not guarantee future results. Yields include dividends in a hypothetical investment for the periods shown. Current performance may be lower or higher than the performance quoted. For performance data current to the most recent month-end, visit oppenheimerfunds.com or call 1.800.CALL OPP (225.5677). The yields take into account voluntary fee waivers and/or expense reimbursements, without which yields would have been lower. Some of these undertakings may be modified or terminated at any time, as indicated in the Fund’s prospectus. The Fund’s performance shown does not reflect the deduction of income taxes on an individual’s investment. Taxes may reduce your actual investment returns on income paid by the Fund. There is no guarantee that the Fund will maintain a positive yield.

4      OPPENHEIMER MONEY MARKET FUND

Shares of Oppenheimer funds are not deposits or obligations of any bank, are not guaranteed by any bank, are not insured by the FDIC or any other agency, and involve investment risks, including the possible loss of the principal amount invested.

An investment in money market funds is neither insured nor 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 investment strategy and focus can change over time. The mention of specific fund holdings does not constitute a recommendation by OppenheimerFunds, Inc. or its affiliates.

Before investing in any of the Oppenheimer funds, investors should carefully consider a fund’s investment objectives, risks, charges and expenses. Fund prospectuses and summary prospectuses contain this and other information about the funds, and may be obtained by asking your financial advisor, visiting oppenheimerfunds.com, or calling 1.800.CALL OPP (225.5677). Read prospectuses and summary prospectuses carefully before investing.

5      OPPENHEIMER MONEY MARKET FUND

Fund Expenses

Fund Expenses. As a shareholder of the Fund, you incur two types of costs: (1) transaction costs, which may include sales charges (loads) on purchase payments and/or contingent deferred sales charges on redemptions; and (2) ongoing costs, including management fees; distribution and service fees; and other Fund expenses. These examples are intended to help you understand your ongoing costs (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds.

The examples are based on an investment of $1,000.00 invested at the beginning of the period and held for the entire 6-month period ended July 31, 2016.

Actual Expenses. The first section of the table provides information about actual account values and actual expenses. You may use the information in this section for the class of shares you hold, together with the amount you invested, to estimate the expense that you paid over the period. Simply divide your account value by $1,000.00 (for example, an $8,600.00 account value divided by $1,000.00 = 8.60), then multiply the result by the number in the first section under the heading entitled “Expenses Paid During 6 Months Ended July 31, 2016” to estimate the expenses you paid on your account during this period.

Hypothetical Example for Comparison Purposes. The second section of the table provides information about hypothetical account values and hypothetical expenses based on the Fund’s actual expense ratio for each class of shares, and an assumed rate of return of 5% per year for each class before expenses, which is not the Fund’s actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example for the class of shares you hold with the 5% hypothetical examples that appear in the shareholder reports of the other funds.

Please note that the expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any transactional costs, such as front-end or contingent deferred sales charges (loads). Therefore, the “hypothetical” section of the table is useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds. In addition, if these transactional costs were included, your costs would have been higher.

6      OPPENHEIMER MONEY MARKET FUND

	Beginning		Ending		Expenses
	Account		Account		Paid During
	Value		Value		6 Months Ended
Actual	February 1, 2016		July 31, 2016		July 31, 2016
Class A	$	1,000.00	$	1,000.10	$	2.84
Class Y		1,000.00		1,000.10		2.84
Hypothetical
(5% return before expenses)
Class A		1,000.00		1,022.03		2.87
Class Y		1,000.00		1,022.03		2.87

Expenses are equal to the Fund’s annualized expense ratio for that class, multiplied by the average account value over the period, multiplied by 182/366 (to reflect the one-half year period). Those annualized expense ratios, excluding indirect expenses from affiliated funds, based on the 6-month period ended July 31, 2016 are as follows:

Class	Expense Ratio	s
Class A	0.57	%
Class Y	0.57

The expense ratios reflect voluntary and/or contractual waivers and/or reimbursements of expenses by the Fund’s Manager. Some of these undertakings may be modified or terminated at any time, as indicated in the Fund’s prospectus. The “Financial Highlights” tables in the Fund’s financial statements, included in this report, also show the gross expense ratios, without such waivers or reimbursements and reduction to custodian expenses, if applicable.

7      OPPENHEIMER MONEY MARKET FUND

STATEMENT OF INVESTMENTS July 31, 2016

		Final Legal
	Maturity		Maturity		Principa	l
	Date*		Date**		Amoun	t		Value
Certificates of Deposit—20.1%
Yankee Certificates of Deposit—20.1%
Bank of Montreal, Chicago:
0.808%1	8/2/16		9/2/16	$	22,000,000		$	22,002,002
0.851%1	8/15/16		8/15/16		30,000,000			30,000,000
Bank of Nova Scotia, Houston TX, 0.828%1	8/23/16		8/23/16		17,000,000			17,001,076
Bank of Tokyo-Mitsubishi UFJ NY, 0.85%2	8/9/16		8/9/16		27,000,000			27,000,653
DnB Bank ASA NY, 0.73%	9/23/16		9/23/16		20,000,000			20,000,000
DZ Bank, New York:
0.55%	9/7/16		9/7/16		30,000,000			30,000,000
0.64%	9/21/16		9/21/16		11,000,000			11,000,000
HSBC Bank USA NA, 0.857%1	8/22/16		9/1/16		28,000,000			28,000,000
Mitsubishi UFJ TR & BK NY:
0.75%2	8/18/16		8/18/16		15,000,000			15,000,000
0.81%2	9/28/16		9/28/16		40,500,000			40,500,000
Skandinaviska Enskilda Banken, Grand Cayman, 0.30%	8/1/16		8/1/16		13,000,000			13,000,000
Sumitomo Mutsui Bank NY:
0.66%	9/26/16		9/26/16		15,000,000			15,000,000
0.71%	9/8/16		9/8/16		25,000,000			25,000,000
0.73%	9/20/16		9/20/16		27,000,000			27,000,000
Toronto Dominion Bank, New York:
0.92%	8/16/16		8/16/16		17,000,000			17,000,000
0.92%	8/15/16		8/15/16		11,500,000			11,500,000
UBS AG, Stamford CT:
0.848%1	8/2/16		8/2/16		25,000,000			25,000,000
0.864%1	8/9/16		9/9/16		10,000,000			10,000,000
Wells Fargo Bank NA, 0.86%	9/28/16		9/28/16		7,000,000			7,001,118
Total Certificates of Deposit (Cost $391,004,849)								391,004,849
Direct Bank Obligations—12.9%
Bank of Nova Scotia, 0.854%2	8/25/16		8/25/16		20,300,000			20,288,497
Bank of Tokyo-Mitsubishi UFJ NY, 0.671%2	9/14/16		9/14/16		3,000,000			2,997,543
BNP Paribas, New York:
0.803%	9/2/16		9/2/16		30,000,000			29,978,667
0.904%	9/12/16		9/12/16		30,000,000			29,968,500
Credit Agricole Corporate & Investment Bank, New York Branch:
0.42%	8/2/16		8/2/16		15,000,000			14,999,825
0.43%	8/4/16		8/4/16		30,000,000			29,998,925
0.43%	8/3/16		8/3/16		50,000,000			49,998,806
Danske Corp., 0.658%3	8/5/16		8/5/16		25,500,000			25,498,139
HSBC USA, Inc., 0.621%	9/13/16		9/13/16		10,000,000			9,992,594
ING (US) Funding LLC, 0.702%	9/9/16		9/9/16		20,000,000			19,984,833
Natixis, New York Branch, 0.41%	8/4/16		8/4/16		20,000,000			19,999,317
Total Direct Bank Obligations (Cost $253,705,646)								253,705,646
Short-Term Notes/Commercial Paper—39.3%
Automobiles—0.2%
Mountain Agency, Inc. (The), 0.65%1	8/5/16		8/5/16		4,320,000			4,320,000

8      OPPENHEIMER MONEY MARKET FUND

	Maturity Date*		Final Legal Maturity Date**		Principal Amount		Value
Commercial Services & Supplies—0.6%
World Wildlife Fund, Inc., 0.49%1		8/5/16		8/5/16	$	11,100,000	$	11,100,000
Health Care Providers & Services—0.1%
B&D Association LLP Eye Association of Boca Raton, 0.54%1		8/5/16		8/5/16		1,980,000		1,980,000
Leasing & Factoring—1.5%
Toyota Motor Credit Corp.:
0.621%		8/17/16		8/17/16		10,000,000		9,997,245
0.621%		8/22/16		8/22/16		20,000,000		19,992,767
								29,990,012
Municipal—5.3%
Athens-Clarke Cnty., GA Unified Government Development Authority, University of Georgia Athletic Assn. Project, Series 2005, 0.43%1		8/5/16		8/5/16		6,025,000		6,025,000
Catawba Cnty., NC Bonds, Catawba Valley Medical Center Project, Series 2009:
0.50%1		8/5/16		8/5/16		4,285,000		4,285,000
0.50%1		8/5/16		8/5/16		5,400,000		5,400,000
Las Cruces, NM Industrial Revenue Bonds, F&A Dairy Products, Inc. Project, Series 2008, 0.46%1		8/5/16		8/5/16		2,275,000		2,275,000
MI Finance Authority School Loan Revolving Fund Revenue Bonds, Series 2010B, 0.42%1		8/5/16		8/5/16		23,000,000		23,000,000
MI Finance Authority School Loan Revolving Fund Revenue Bonds, Series 2014A, 0.48%1		8/5/16		8/5/16		5,800,000		5,800,000
NYS Housing Finance Agency 8 East 102nd State Housing Revenue Bonds, Series 2010B, 0.44%1		8/5/16		8/5/16		8,010,000		8,010,000
OH Air Quality Development Authority, AK Steel Project, Series 2004B, 0.45%1		8/5/16		8/5/16		16,000,000		16,000,000
PA Economic Development Finance Authority 2006, PMF Industries, Inc. Project, Series A2, 0.66%1		8/5/16		8/5/16		600,000		600,000
Saratoga Cnty. Industrial Development Agency Bonds, Globalfoundries US, Inc., Series 2013, 0.45%1		8/5/16		8/5/16		9,020,000		9,020,000
St. Paul, MN Bonds, Rivercentre Arena Project, Series 2009A, 0.46%1		8/5/16		8/5/16		13,300,000		13,300,000
Westchester Cnty. Healthcare Corp. Revenue Bonds, Series 2010D, 0.45%1		8/5/16		8/5/16		10,000,000		10,000,000
								103,715,000
Receivables Finance—16.9%
Barton Capital SA:
0.459%3		8/1/16		8/1/16		32,000,000		32,000,000
0.54%3		8/10/16		8/10/16		26,000,000		25,996,490
Manhattan Asset Funding Co.:
0.54%3		8/22/16		8/22/16		10,000,000		9,996,850
0.55%3		8/16/16		8/16/16		10,000,000		9,997,708

9      OPPENHEIMER MONEY MARKET FUND

STATEMENT OF INVESTMENTS Continued

	Maturity Date*		Final Legal Maturity Date**		Principal Amount		Value
Receivables Finance (Continued)
Old Line Funding Corp.:
0.783%3		9/26/16		9/26/16	$	12,000,000	$	11,985,440
0.874%3		9/27/16		9/27/16		5,000,000		4,993,113
0.874%3		9/26/16		9/26/16		10,000,000		9,986,467
0.874%3		9/15/16		9/15/16		11,000,000		10,988,037
0.884%3		9/16/16		9/16/16		16,500,000		16,481,447
Sheffield Receivables Corp., 0.603%3		8/1/16		8/1/16		56,500,000		56,500,000
Starbird Funding Corp.:
0.41%3		8/1/16		8/1/16		20,300,000		20,300,000
0.854%2,3		8/2/16		8/2/16		12,500,000		12,499,705
0.884%3		8/23/16		8/23/16		15,000,000		14,991,933
Thunder Bay Funding LLC:
0.651%3		9/27/16		9/27/16		28,000,000		27,971,183
0.671%3		9/26/16		9/26/16		17,000,000		16,982,282
0.86%3		9/9/16		9/9/16		10,000,000		9,990,725
Victory Receivables Corp.:
0.54%3		8/8/16		8/8/16		12,000,000		11,998,740
0.55%3		8/3/16		8/3/16		10,000,000		9,999,695
0.56%3		8/12/16		8/12/16		13,500,000		13,497,690
								327,157,505
Special Purpose Financial—14.7%
Anglesea Funding LLC:
0.43%2		8/4/16		8/4/16		29,000,000		28,998,961
0.43%2		8/5/16		8/5/16		19,000,000		18,999,092
0.43%2		8/2/16		8/2/16		32,500,000		32,499,612
0.584%1,2		8/5/16		8/5/16		15,000,000		15,000,000
Bennington Stark Capital Co.:
0.50%3		8/8/16		8/8/16		20,000,000		19,998,056
0.601%3		9/6/16		9/6/16		25,000,000		24,985,000
Cedar Springs Capital Co. LLC, 0.599%		8/8/16		8/8/16		25,000,000		24,997,093
Concord Minutemen Cap. Co. LLC:
0.47%		8/9/16		8/9/16		20,000,000		19,997,911
0.50%		8/30/16		8/30/16		20,000,000		19,991,944
Lexington Parker Capital Co. LLC:
0.45%3		8/1/16		8/1/16		41,000,000		41,000,000
0.47%3		8/19/16		8/19/16		25,000,000		24,994,125
Ridgefield Funding Co. LLC, 0.762%		9/19/16		9/19/16		15,000,000		14,984,483
								286,446,277
Total Short-Term Notes/Commercial Paper (Cost $764,708,794)								764,708,794
U.S. Government Agencies—18.3%
Fannie Mae:
0.315%		10/4/16		10/4/16		20,000,000		19,988,800
0.32%		11/1/16		11/1/16		20,000,000		19,983,644
0.32%		11/3/16		11/3/16		20,000,000		19,983,289
Federal Agricultural Mortgage Corp., 0.391%		11/23/16		11/23/16		20,000,000		19,975,300

10      OPPENHEIMER MONEY MARKET FUND

	Maturity Date*		Final Legal Maturity Date**		Principal Amount		Value
U.S. Government Agencies (Continued)
Federal Home Loan Bank:
0.32%		9/29/16		9/29/16	$	20,000,000	$	19,989,511
0.32%		10/3/16		10/3/16		20,000,000		19,988,800
0.35%		10/20/16		10/20/16		26,499,000		26,478,390
0.36%		10/7/16		10/7/16		20,000,000		19,986,600
0.362%		10/26/16		10/26/16		20,000,000		19,982,704
0.365%		10/5/16		10/5/16		20,000,000		19,986,819
0.365%		10/11/16		10/11/16		20,000,000		19,985,603
0.365%		10/14/16		10/14/16		20,000,000		19,984,994
0.375%		10/12/16		10/12/16		20,000,000		19,985,000
0.375%		10/21/16		10/21/16		10,000,000		9,991,563
0.454%1		8/11/16		1/11/17		20,000,000		20,000,421
0.516%1		8/28/16		4/28/17		20,000,000		20,000,000
0.65%		4/28/17		4/28/17		5,000,000		5,000,000
Freddie Mac:
0.295%		10/6/16		10/6/16		15,000,000		14,991,888
0.329%		10/17/16		10/17/16		20,000,000		19,985,926
Total U.S. Government Agencies (Cost $356,269,252)								356,269,252
Repurchase Agreements—9.5%
Repurchase Agreements4 (Cost $185,000,000)						185,000,000		185,000,000
Total Investments, at Value (Cost $1,950,688,541)						100.1%		1,950,688,541
Net Other Assets (Liabilities)						(0.1)		(1,797,559)
Net Assets						100.0%	$	1,948,890,982

Footnotes to Statement of Investments

Short-term notes and direct bank obligations are generally traded on a discount basis; the interest rate shown is the discount rate received by the Fund at the time of purchase. Other securities normally bear interest at the rates shown.

* The Maturity Date represents the date used to calculate the Fund’s weighted average maturity as determined under Rule 2a-7.

** If different from the Maturity Date, the Final Legal Maturity Date includes any maturity date extensions which may be affected at the option of the issuer or unconditional payments of principal by the issuer which may be affected at the option of the Fund, and represents the date used to calculate the Fund’s weighted average life as determined under Rule 2a-7.

1. Represents the current interest rate for a variable or increasing rate security.

2. Represents securities sold under Rule 144A, which are exempt from registration under the Securities Act of 1933, as amended. These securities have been determined to be liquid under guidelines established by the Board of Trustees. These securities amount to $213,784,063 or 10.97% of the Fund’s net assets at period end.

3. Security issued in an exempt transaction without registration under the Securities Act of 1933. Such securities amount to $463,632,825 or 23.79% of the Fund’s net assets, and have been determined to be liquid pursuant to guidelines adopted by the Board of Trustees.

11      OPPENHEIMER MONEY MARKET FUND

STATEMENT OF INVESTMENTS Continued

Footnotes to Statement of Investments (Continued)

4. Repurchase agreements:

Counterparty		Lending Rate		Settlement Date		Maturity Date		Principal Amount
South Street
Securities LLC			0.45%		7/29/16		8/1/16		$150,000,000
Credit Suisse
Securities LLC			0.35		7/29/16		8/1/16		35,000,000
Counterparty	Collateralized By			Collateral Received, at Valuea		Repurchase Agreements, at Value		Repurchase Agreement Proceeds to be Receiveda
South Street Securities LLC	U.S. Government Agency Mortgages, 1.909%-6.50%, 1/1/17-4/20/45			$	(153,995,645)	$	150,000,000		$150,005,626
Credit Suisse
Securities LLC	U.S. Treasury Nts., 2.00%, 11/30/22				(35,703,874)		35,000,000		35,001,021
				$	(189,699,519)	$	185,000,000		$185,006,647

a. Includes accrued interest.

See accompanying Notes to Financial Statements.

12      OPPENHEIMER MONEY MARKET FUND

STATEMENT OF ASSETS AND LIABILITIES July 31, 2016

Assets
Investments, at value (cost $1,950,688,541)—see accompanying statement of investments	$	1,950,688,541
Cash		155,599
Receivables and other assets:
Shares of beneficial interest sold		2,928,980
Interest		689,477
Other		189,173
Total assets		1,954,651,770
Liabilities
Payables and other liabilities:
Shares of beneficial interest redeemed		5,374,928
Trustees’ compensation		341,012
Shareholder communications		13,499
Dividends		6,675
Other		24,674
Total liabilities		5,760,788
Net Assets	$	1,948,890,982
Composition of Net Assets
Par value of shares of beneficial interest	$	194,895,923
Additional paid-in capital		1,754,149,557
Accumulated net investment loss		(160,707)
Accumulated net realized gain on investments		6,209
Net Assets	$	1,948,890,982
Net Asset Value Per Share
Class A Shares:
Net asset value, redemption price and offering per share (based on net assets of $1,856,396,497 and 1,856,449,003 shares of beneficial interest outstanding)		$1.00
Class Y Shares:
Net asset value, redemption price and offering price per share (based on net assets of $92,494,485 and 92,510,228 shares of beneficial interest outstanding)		$1.00

See accompanying Notes to Financial Statements.

13      OPPENHEIMER MONEY MARKET FUND

STATEMENT OF OPERATIONS For the Year Ended July 31, 2016

Investment Income
Interest	$	8,416,622
Expenses
Management fees		7,690,988
Transfer and shareholder servicing agent fees:
Class A		3,891,971
Class Y		182,480
Shareholder communications:
Class A		47,926
Class Y		141
Trustees’ compensation		31,139
Custodian fees and expenses		20,669
Other		69,853
Total expenses		11,935,167
Less waivers and reimbursements of expenses		(3,704,377)
Net expenses		8,230,790
Net Investment Income		185,832
Net realized Gain on Investments		6,209
Net Increase in Net Assets Resulting from Operations	$	192,041

See accompanying Notes to Financial Statements.

14      OPPENHEIMER MONEY MARKET FUND

STATEMENTS OF CHANGES IN NET ASSETS

	Year Ended July 31, 2016		Year Ended July 31, 2015
Operations
Net investment income	$	185,832	$	180,544
Net realized gain		6,209		13,921
Net increase in net assets resulting from operations		192,041		194,465
Dividends and/or Distributions to Shareholders
Dividends from net investment income:
Class A		(154,346)		(150,517)
Class Y		(8,558)		(7,413)
		(162,904)		(157,930)
Distributions from net realized gain:
Class A		—		(34,785)
Class Y		—		(1,445)
		—		(36,230)
Beneficial Interest Transactions
Net increase (decrease) in net assets resulting from beneficial interest transactions:
Class A		135,933,846		(45,840,596)
Class Y		18,751,303		1,439,674
		154,685,149		(44,400,922)
Net Assets
Total increase (decrease)		154,714,286		(44,400,617)
Beginning of period		1,794,176,696		1,838,577,313
End of period (including accumulated net investment loss of $160,707 and $192,774, respectively)	$	1,948,890,982	$	1,794,176,696

See accompanying Notes to Financial Statements.

15      OPPENHEIMER MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Class A	Year Ended July 31, 2016		Year Ended July 31, 2015		Year Ended July 31, 2014		Year Ended July 31, 2013		Year Ended July 31, 2012
Per Share Operating Data
Net asset value, beginning of period		$1.00		$1.00		$1.00		$1.00		$1.00
Income (loss) from investment operations:
Net investment income1		0.002		0.002		0.002		0.002		0.002
Net realized gain		0.002		0.002		0.002		0.002		0.002
Total from investment operations		0.002		0.002		0.002		0.002		0.002
Dividends and/or distributions to shareholders:
Dividends from net investment income		(0.00)2		(0.00)2		(0.00)2		(0.00)2		(0.00)2
Distributions from net realized gain		0.00		(0.00)2		0.00		0.00		0.00
Total dividends and/or distributions to shareholders		(0.00)2		(0.00)2		(0.00)2		(0.00)2		(0.00)2
Net asset value, end of period		$1.00		$1.00		$1.00		$1.00		$1.00
Total Return3		0.01%		0.01%		0.01%		0.01%		0.01%
Ratios/Supplemental Data
Net assets, end of period (in thousands)		$1,856,397		$1,720,434		$1,766,273		$1,974,691		$1,764,934
Average net assets (in thousands)		$1,779,276		$1,722,901		$1,877,697		$1,826,413		$1,869,340
Ratios to average net assets:4
Net investment income		0.01%		0.01%		0.01%		0.01%		0.01%
Total expenses		0.64%		0.65%		0.67%		0.70%		0.66%
Expenses after payments, waivers and/or reimbursements and reduction to custodian expenses		0.44%		0.21%		0.20%		0.25%		0.31%

1. Per share amounts calculated based on the average shares outstanding during the period.

2. Less than $0.005 per share.

3. Assumes an initial investment on the business day before the first day of the fiscal period, with all dividends and distributions reinvested in additional shares on the reinvestment date, and redemption at the net asset value calculated on the last business day of the fiscal period. Total returns are not annualized for periods less than one full year. Returns do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.

4. Annualized for periods less than one full year.

See accompanying Notes to Financial Statements.

16      OPPENHEIMER MONEY MARKET FUND

Class Y	Year Ended July 31, 2016		Year Ended July 31, 2015		Year Ended July 31, 2014		Year Ended July 31, 2013		Year Ended July 31, 2012
Per Share Operating Data
Net asset value, beginning of period		$1.00		$1.00		$1.00		$1.00		$1.00
Income (loss) from investment operations:
Net investment income1		0.002		0.002		0.002		0.002		0.002
Net realized gain		0.002		0.002		0.002		0.002		0.002
Total from investment operations		0.002		0.002		0.002		0.002		0.002
Dividends and/or distributions to shareholders:
Dividends from net investment income		(0.00)2		(0.00)2		(0.00)2		(0.00)2		(0.00)2
Distributions from net realized gain		0.00		(0.00)2		0.00		0.00		0.00
Total dividends and/or distributions to shareholders		(0.00)2		(0.00)2		(0.00)2		(0.00)2		(0.00)2
Net asset value, end of period		$1.00		$1.00		$1.00		$1.00		$1.00
Total Return3		0.01%		0.01%		0.01%		0.01%		0.01%
Ratios/Supplemental Data
Net assets, end of period (in thousands)		$92,494		$73,743		$72,304		$198,195		$152,318
Average net assets (in thousands)		$83,425		$71,722		$171,891		$177,213		$155,158
Ratios to average net assets:4
Net investment income		0.01%		0.01%		0.01%		0.01%		0.01%
Total expenses		0.64%		0.65%		0.55%		0.44%		0.44%
Expenses after payments, waivers and/or reimbursements and reduction to custodian expenses		0.45%		0.21%		0.19%		0.25%		0.30%

1. Per share amounts calculated based on the average shares outstanding during the period.

2. Less than $0.005 per share.

3. Assumes an initial investment on the business day before the first day of the fiscal period, with all dividends and distributions reinvested in additional shares on the reinvestment date, and redemption at the net asset value calculated on the last business day of the fiscal period. Total returns are not annualized for periods less than one full year. Returns do not reflect the deduction of taxes that a shareholder would pay on fund distributions or the redemption of fund shares.

4. Annualized for periods less than one full year.

See accompanying Notes to Financial Statements.

17      OPPENHEIMER MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS July 31, 2016

1. Organization

Oppenheimer Money Market Fund (the “Fund”) is registered under the Investment Company Act of 1940 (“1940 Act”), as amended, as a diversified open-end management investment company. The Fund’s investment objective is to seek income consistent with stability of principal. The Fund’s investment adviser is OFI Global Asset Management, Inc. (“OFI Global” or the “Manager”), a wholly-owned subsidiary of OppenheimerFunds, Inc. (“OFI” or the “Sub-Adviser”). The Manager has entered into a sub-advisory agreement with OFI.

The Fund offers Class A and Class Y shares. Class A shares are sold at their offering price, which is the net asset value per share without any initial sales charge. Class Y shares are sold to certain institutional investors without a front-end sales charge, however, the intermediaries may impose charges on their accountholders who beneficially own Class Y shares. Both classes of shares have identical rights and voting privileges with respect to the Fund in general and exclusive voting rights on matters that affect that class alone. Earnings, net assets and net asset value per share may differ due to each class having its own expenses, such as transfer and shareholder servicing agent fees and shareholder communications, directly attributable to that class.

The following is a summary of significant accounting policies followed in the Fund’s preparation of financial statements in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”).

2. Significant Accounting Policies

Security Valuation. All investments in securities are recorded at their estimated fair value, as described in Note 3.

Allocation of Income, Expenses, Gains and Losses. Income, expenses (other than those attributable to a specific class), gains and losses are allocated on a daily basis to each class of shares based upon the relative proportion of net assets represented by such class. Operating expenses directly attributable to a specific class are charged against the operations of that class.

Dividends and Distributions to Shareholders. Dividends and distributions to shareholders, which are determined in accordance with income tax regulations and may differ from U.S. GAAP, are recorded on the ex-dividend date. Income distributions, if any, are declared daily and paid monthly. Capital gain distributions, if any, are declared and paid annually but may be paid at other times to maintain the net asset value per share at $1.00.

Investment Income. Interest income is recognized on an accrual basis. Discount and premium, which are included in interest income on the Statement of Operations, are amortized or accreted daily.

Custodian Fees. “Custodian fees and expenses” in the Statement of Operations may include interest expense incurred by the Fund on any cash overdrafts of its custodian account

18      OPPENHEIMER MONEY MARKET FUND

2. Significant Accounting Policies (Continued)

during the period. Such cash overdrafts may result from the effects of failed trades in portfolio securities and from cash outflows resulting from unanticipated shareholder redemption activity. The Fund pays interest to its custodian on such cash overdraft at a rate equal to the Prime Rate plus 0.35%. The “Reduction to custodian expenses” line item, if applicable, represents earnings on cash balances maintained by the Fund during the period. Such interest expense and other custodian fees may be paid with these earnings.

Security Transactions. Security transactions are recorded on the trade date. Realized gains and losses on securities sold are determined on the basis of identified cost.

Indemnifications. The Fund’s organizational documents provide current and former Trustees and officers with a limited indemnification against liabilities arising in connection with the performance of their duties to the Fund. In the normal course of business, the Fund may also enter into contracts that provide general indemnifications. The Fund’s maximum exposure under these arrangements is unknown as this would be dependent on future claims that may be made against the Fund. The risk of material loss from such claims is considered remote.

Federal Taxes. The Fund intends to comply with provisions of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its investment company taxable income to shareholders. Therefore, no federal income or excise tax provision is required. The Fund files income tax returns in U.S. federal and applicable state jurisdictions. The statute of limitations on the Fund’s tax return filings generally remains open for the three preceding fiscal reporting period ends. The Fund has analyzed its tax positions for the fiscal year ended July 31, 2016, including open tax years, and does not believe there are any uncertain tax positions requiring recognition in the Fund’s financial statements.

The tax components of capital shown in the following table represent distribution requirements the Fund must satisfy under the income tax regulations, losses the Fund may be able to offset against income and gains realized in future years for federal income tax purposes.

Undistributed Net Investment Income	Undistributed Long-Term Gain		Accumulated Loss Carryforward
$31,614		$—		$—

Net investment income and net realized gain may differ for financial statement and tax purposes. The character of dividends and distributions made during the fiscal year from net investment income or net realized gains are determined in accordance with federal income tax requirements, which may differ from the character of net investment income or net realized gains presented in those financial statements in accordance with U.S. GAAP. Also, due to timing of dividends and distributions, the fiscal year in which amounts are distributed may differ from the fiscal year in which the income or net realized gain was recorded by the Fund.

19      OPPENHEIMER MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS Continued

2. Significant Accounting Policies (Continued)

Accordingly, the following amounts have been reclassified for the reporting period. Net assets of the Fund were unaffected by the reclassifications.

Reduction to Accumulated Net Investment Loss	Reduction to Accumulated Net Realized Gain on Investments
$9,139		$9,139

The tax character of distributions paid during the reporting periods:

	Year Ended             July 31, 2016		Year Ended             July 31, 2015
Distributions paid from:
Ordinary income	$	162,904	$	194,160

Use of Estimates. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases and decreases in net assets from operations during the reporting period. Actual results could differ from those estimates.

Money Market Fund Reform. In accordance with the Reform Rules, adopted by the Securities and Exchange Commission (SEC) in July 2014, the Fund’s name will change from Oppenheimer Money Market Fund to Oppenheimer Government Money Market Fund on or around September 28, 2016. Additionally the Board of Trustees approved the adoption of a new non-fundamental investment policy requiring each Fund to invest 99.5% or more of its total assets in cash, government securities, and/or repurchase agreements that are collateralized fully by cash and/or government securities.

3. Securities Valuation

The Fund calculates the net asset value of its shares as of 4:00 P.M. Eastern time, on each day the New York Stock Exchange (the “Exchange”) is open for trading, except in the case of a scheduled early closing of the Exchange, in which case the Fund will calculate net asset value of the shares as of the scheduled early closing time of the Exchange.

The Fund’s Board has adopted procedures for the valuation of the Fund’s securities and has delegated the day-to-day responsibility for valuation determinations under those procedures to the Manager. The Manager has established a Valuation Committee which is responsible for determining a “fair valuation” for any security for which market quotations are not “readily available.” The Valuation Committee’s fair valuation determinations are subject to review, approval and ratification by the Fund’s Board at its next regularly scheduled meeting covering the calendar quarter in which the fair valuation was determined.

20      OPPENHEIMER MONEY MARKET FUND

3. Securities Valuation (Continued)

Valuation Methods and Inputs

Securities are valued at cost adjusted by the amortization of discount or premium to maturity (amortized cost), which approximates market value. If amortized cost is determined not to approximate market value, the fair value of the portfolio securities will be determined under procedures approved by the Fund’s Board of Trustees.

If a market value or price cannot be determined for a security using the methodologies described above, or if, in the “good faith” opinion of the Manager, the market value or price obtained does not constitute a “readily available market quotation,” or a significant event has occurred that would materially affect the value of the security, the security is fair valued either (i) by a standardized fair valuation methodology applicable to the security type or the significant event as previously approved by the Valuation Committee and the Fund’s Board or (ii) as determined in good faith by the Manager’s Valuation Committee. The Valuation Committee considers all relevant facts that are reasonably available, through either public information or information available to the Manager, when determining the fair value of a security. Fair value determinations by the Manager are subject to review, approval and ratification by the Fund’s Board at its next regularly scheduled meeting covering the calendar quarter in which the fair valuation was determined. Those fair valuation standardized methodologies include, but are not limited to, valuing securities at the last sale price or initially at cost and subsequently adjusting the value based on: changes in company specific fundamentals, changes in an appropriate securities index, or changes in the value of similar securities which may be further adjusted for any discounts related to security-specific resale restrictions. When possible, such methodologies use observable market inputs such as unadjusted quoted prices of similar securities, observable interest rates, currency rates and yield curves. The methodologies used for valuing securities are not necessarily an indication of the risks associated with investing in those securities nor can it be assured that the Fund can obtain the fair value assigned to a security if it were to sell the security.

To assess the continuing appropriateness of security valuations, the Manager, or its third party service provider who is subject to oversight by the Manager, regularly compares prior day prices, prices on comparable securities, and sale prices to the current day prices and challenges those prices exceeding certain tolerance levels with the third party pricing service or broker source. For those securities valued by fair valuations, whether through a standardized fair valuation methodology or a fair valuation determination, the Valuation Committee reviews and affirms the reasonableness of the valuations based on such methodologies and fair valuation determinations on a regular basis after considering all relevant information that is reasonably available.

Classifications

Each investment asset or liability of the Fund is assigned a level at measurement date based on the significance and source of the inputs to its valuation. Various data inputs are used in determining the value of each of the Fund’s investments as of the reporting period end. These data inputs are categorized in the following hierarchy under applicable financial accounting standards:

21      OPPENHEIMER MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS Continued

3. Securities Valuation (Continued)

1) Level 1-unadjusted quoted prices in active markets for identical assets or liabilities (including securities actively traded on a securities exchange)

2) Level 2-inputs other than unadjusted quoted prices that are observable for the asset or liability (such as unadjusted quoted prices for similar assets and market corroborated inputs such as interest rates, prepayment speeds, credit risks, etc.)

3) Level 3-significant unobservable inputs (including the Manager’s own judgments about assumptions that market participants would use in pricing the asset or liability).

The inputs used for valuing securities are not necessarily an indication of the risks associated with investing in those securities.

The table below categorizes amounts that are included in the Fund’s Statement of Assets and Liabilities at period end based on valuation input level:

	Level 1— Unadjusted Quoted Prices		Level 2— Other Significant Observable Inputs		Level 3— Significant Unobservable Inputs		Value
Assets Table
Investments, at Value:
Certificates of Deposit	$	—	$	391,004,849	$	—	$	391,004,849
Direct Bank Obligations		—		253,705,646		—		253,705,646
Short-Term Notes/Commercial Paper		—		764,708,794		—		764,708,794
U.S. Government Agencies		—		356,269,252		—		356,269,252
Repurchase Agreements		—		185,000,000		—		185,000,000
Total Assets	$	—	$	1,950,688,541	$	—	$	1,950,688,541

4. Market Risk Factors

The Fund’s investments in securities and/or financial derivatives may expose the Fund to various market risk factors:

Commodity Risk. Commodity risk relates to the change in value of commodities or commodity indexes as they relate to increases or decreases in the commodities market. Commodities are physical assets that have tangible properties. Examples of these types of assets are crude oil, heating oil, metals, livestock, and agricultural products.

Credit Risk. Credit risk relates to the ability of the issuer of debt to meet interest and principal payments, or both, as they come due. In general, lower-grade, higher-yield debt securities are subject to credit risk to a greater extent than lower-yield, higher-quality securities.

Equity Risk. Equity risk relates to the change in value of equity securities as they relate to increases or decreases in the general market.

Foreign Exchange Rate Risk. Foreign exchange rate risk relates to the change in the U.S. dollar value of a security held that is denominated in a foreign currency. The U.S. dollar value of a foreign currency denominated security will decrease as the dollar appreciates against the currency, while the U.S. dollar value will increase as the dollar depreciates

22      OPPENHEIMER MONEY MARKET FUND

4. Market Risk Factors (Continued)

against the currency.

Interest Rate Risk. Interest rate risk refers to the fluctuations in value of fixed-income securities resulting from the inverse relationship between price and yield. For example, an increase in general interest rates will tend to reduce the market value of already issued fixed-income investments, and a decline in general interest rates will tend to increase their value. In addition, debt securities with longer maturities, which tend to have higher yields, are subject to potentially greater fluctuations in value from changes in interest rates than obligations with shorter maturities.

Volatility Risk. Volatility risk refers to the magnitude of the movement, but not the direction of the movement, in a financial instrument’s price over a defined time period. Large increases or decreases in a financial instrument’s price over a relative time period typically indicate greater volatility risk, while small increases or decreases in its price typically indicate lower volatility risk.

5. Shares of Beneficial Interest

The Fund has authorized an unlimited number of $0.10 par value shares of beneficial interest of each class. Transactions in shares of beneficial interest were as follows:

	Year Ended July 31, 2016					Year Ended July 31, 2015
	Shares		Amount			Shares		Amount
Class A
Sold		1,308,233,844	$	1,308,233,844			1,198,913,513	$	1,198,913,513
Dividends and/or distributions reinvested		151,547		151,547			181,323		181,323
Redeemed		(1,172,451,545)		(1,172,451,545	)		(1,244,935,432)		(1,244,935,432)
Net increase (decrease)		135,933,846	$	135,933,846			(45,840,596)	$	(45,840,596)
Class Y
Sold		115,499,372	$	115,499,372			120,710,052	$	120,710,052
Dividends and/or distributions reinvested		8,425		8,425			8,740		8,740
Redeemed		(96,756,494)		(96,756,494	)		(119,279,118)		(119,279,118)
Net increase		18,751,303	$	18,751,303			1,439,674	$	1,439,674

6. Fees and Other Transactions with Affiliates

Management Fees. Under the investment advisory agreement, the Fund pays the Manager a management fee based on the daily net assets of the Fund at an annual rate as shown in the following table:

Fee Schedule
Up to $500 million	0.450%
Next to $500 million	0.425
Next to $500 million	0.400
Next $1.5 billion	0.375
Over $3.0 billion	0.350

The Fund’s effective management fee for the reporting period was 0.41% of average annual

23      OPPENHEIMER MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS Continued

6. Fees and Other Transactions with Affiliates (Continued)

net assets before any applicable waivers.

Sub-Adviser Fees. The Manager has retained the Sub-Adviser to provide the day-to-day portfolio management of the Fund. Under the Sub-Advisory Agreement, the Manager pays the Sub-Adviser an annual fee in monthly installments, equal to a percentage of the investment management fee collected by the Manager from the Fund, which shall be calculated after any investment management fee waivers. The fee paid to the Sub-Adviser is paid by the Manager, not by the Fund.

Transfer Agent Fees. OFI Global (the “Transfer Agent”) serves as the transfer and shareholder servicing agent for the Fund. The Fund pays the Transfer Agent a fee based on annual net assets. Fees incurred and average net assets for each class with respect to these services are detailed in the Statement of Operations and Financial Highlights, respectively.

Sub-Transfer Agent Fees. The Transfer Agent has retained Shareholder Services, Inc., a wholly-owned subsidiary of OFI (the “Sub-Transfer Agent”), to provide the day-to-day transfer agent and shareholder servicing of the Fund. Under the Sub-Transfer Agency Agreement, the Transfer Agent pays the Sub-Transfer Agent an annual fee in monthly installments, equal to a percentage of the transfer agent fee collected by the Transfer Agent from the Fund, which shall be calculated after any applicable fee waivers. The fee paid to the Sub-Transfer Agent is paid by the Transfer Agent, not by the Fund.

Trustees’ Compensation. The Fund has adopted an unfunded retirement plan (the “Plan”) for the Fund’s Independent Trustees. Benefits are based on years of service and fees paid to each Trustee during their period of service. The Plan was frozen with respect to adding new participants effective December 31, 2006 (the “Freeze Date”) and existing Plan Participants as of the Freeze Date will continue to receive accrued benefits under the Plan. Active Independent Trustees as of the Freeze Date have each elected a distribution method with respect to their benefits under the Plan. During the reporting period, the Fund’s projected benefit obligations, payments to retired Trustees and accumulated liability were as follows:

Projected Benefit Obligations Increased	$	—
Payments Made to Retired Trustees		24,753
Accumulated Liability as of July 31, 2016		170,435

The Fund’s Board of Trustees (“Board”) has adopted a compensation deferral plan for Independent Trustees that enables Trustees to elect to defer receipt of all or a portion of the annual compensation they are entitled to receive from the Fund. For purposes of determining the amount owed to the Trustee under the plan, deferred amounts are treated as though equal dollar amounts had been invested in shares of the Fund or in other Oppenheimer funds selected by the Trustee. The Fund purchases shares of the funds selected for deferral by the Trustee in amounts equal to his or her deemed investment, resulting in a Fund asset equal to the deferred compensation liability. Such assets are included as a component of “Other”

24      OPPENHEIMER MONEY MARKET FUND

6. Fees and Other Transactions with Affiliates (Continued)

within the asset section of the Statement of Assets and Liabilities. Deferral of Trustees’ fees under the plan will not affect the net assets of the Fund and will not materially affect the Fund’s assets, liabilities or net investment income per share. Amounts will be deferred until distributed in accordance with the compensation deferral plan.

Sales Charges. Contingent deferred sales charge (“CDSC”) do not represent an expense of the Fund. They are deducted from the proceeds of sales of Fund shares prior to investment or from redemption proceeds prior to remittance. The CDSC retained by the Distributor on the redemption of shares is shown in the following table for the period indicated.

Year Ended	Class A Contingent Deferred Sales Charges Retained by Distributor
July 31, 2016		$15,372

Waivers and Reimbursements of Expenses. The Manager has voluntarily undertaken to waive fees and/or reimburse Fund expenses to the extent necessary to assist the Fund in attempting to maintain a positive yield. As a result, for the reporting period, the Manager waived fees and/or reimbursed the Fund $3,543,703 and $160,674 for Class A and Class Y shares, respectively. There is no guarantee that the Fund will maintain a positive yield.

The Manager is permitted to recapture previously waived and/or reimbursed fees in any given fiscal year if the recapture would not: 1) cause the Fund to generate a negative daily yield, and 2) exceed amounts previously waived and/or reimbursed under this arrangement during the current and prior three fiscal years. The reimbursement to the Manager of such previous waivers and reimbursements would not include any portion of distribution and/or service fees. At period end, the following waived and/or reimbursed amounts are eligible for recapture:

Expiration Date	Class A		Class Y
July 31, 2017	$	8,801,629	$	617,079
July 31, 2018		7,564,535		312,467
July 31, 2019		3,543,703		160,674

The Manager has not recaptured any previously waived and/or reimbursed amounts during the reporting period.

Waivers and/or reimbursements may be modified or terminated as set forth according to the terms in the prospectus.

7. Borrowings and Other Financing

Repurchase Agreements. In a repurchase transaction, a Fund buys a security and simultaneously sells it back to an approved institution for delivery on an agreed-upon future date. The resale price exceeds the purchase price by an amount that reflects an agreed-upon

25      OPPENHEIMER MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS Continued

7. Borrowings and Other Financing (Continued)

interest rate effective for the period during which the repurchase agreement is in effect. Approved institutions include U.S. commercial banks, U.S. branches of foreign banks or broker-dealers that have been designated as primary dealers in government securities. They must meet credit requirements set by the investment adviser from time to time. Repurchase agreements must be fully collateralized. However, if the seller fails to pay the repurchase price on the delivery date, a Fund may incur costs in disposing of the collateral and may experience losses if there is any delay in its ability to do so. If the default on the part of the seller is due to its bankruptcy, a Fund’s ability to liquidate the collateral may be delayed or limited.

The following is a summary by counterparty of the market value of Borrowings and Other Financing Transactions and collateral (received) as of period end:

Counterparty	Repurchase Agreement Proceeds to be Received1		Collateral (Received) / Pledged1	Net Exposure2
Repurchase Agreements
South Street Securities LLC	$	(150,005,626)	$(153,995,645)		$(3,990,019)
Credit Suisse Securities LLC		(35,001,021)	(35,703,874)		(702,853)
	$	(185,006,647)

1. Includes accrued interest.

2. Net exposure represents the net receivable/payable that would be due from the counterparty in the event of default.

8. Pending Litigation

In 2009, several putative class action lawsuits were filed and later consolidated before the U.S. District Court for the District of Colorado against OppenheimerFunds, Inc. (“OFI”), OppenheimerFunds Distributor, Inc. (“OFDI”), and Oppenheimer Rochester California Municipal Fund, a fund advised by OFI Global Asset Management, Inc. and distributed by the Distributor (the “California Fund”), in connection with the California Fund’s investment performance. The plaintiffs asserted claims against OFI, OFDI and certain present and former trustees and officers of the California Fund under the federal securities laws, alleging, among other things, that the disclosure documents of the California Fund contained misrepresentations and omissions and the investment policies of the California Fund were not followed. Plaintiffs in the suit filed an amended complaint and defendants filed a motion to dismiss. In 2011, the court issued an order which granted in part and denied in part the defendants’ motion to dismiss. In 2012, plaintiffs filed a motion, which defendants opposed, to certify a class and appoint class representatives and class counsel. In March 2015, the court granted plaintiffs’ motion for class certification. In May 2015, the U.S. Court of Appeals for the Tenth Circuit vacated the class certification order and remanded the matter to the district court for further proceedings. In October 2015, the district court reaffirmed its order and determined that the suit will proceed as a class action. In December 2015, the Tenth Circuit denied defendants’ petition to appeal the district court’s reaffirmed class certification order.

26      OPPENHEIMER MONEY MARKET FUND

8. Pending Litigation (Continued)

OFI and OFDI believe the suit is without merit; that it is premature to render any opinion as to the likelihood of an outcome unfavorable to them in the suit; and that no estimate can yet be made as to the amount or range of any potential loss. Furthermore, OFI believes that the suit should not impair the ability of OFI or OFDI to perform their respective duties to the Fund and that the outcome of the suit should not have any material effect on the operations of any of the Oppenheimer funds.

27      OPPENHEIMER MONEY MARKET FUND

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Trustees and Shareholders of Oppenheimer Money Market Fund:

We have audited the accompanying statement of assets and liabilities of Oppenheimer Money Market Fund, including the statement of investments, as of July 31, 2016, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the years in the two-year period then ended, and the financial highlights for each of the years in the five-year period then ended. These financial statements and financial highlights are the responsibility of the Fund’s management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. Our procedures included confirmation of securities owned as of July 31, 2016, by correspondence with the custodian and transfer agent. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of Oppenheimer Money Market Fund as of July 31, 2016, the results of its operations for the year then ended, the changes in its net assets for each of the years in the two-year period then ended, and the financial highlights for each of the years in the five-year period then ended, in conformity with U.S. generally accepted accounting principles.

KPMG LLP

Denver, Colorado

September 12, 2016

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FEDERAL INCOME TAX INFORMATION Unaudited

In early 2016, if applicable, shareholders of record received information regarding all dividends and distributions paid to them by the Fund during calendar year 2015.

None of the dividends paid by the Fund during the reporting period are eligible for the corporate dividend-received deduction.

Dividends, if any, paid by the Fund during the reporting period which are not designated as capital gain distributions, may be eligible for lower individual income tax rates to the extent that the Fund has received qualified dividend income as stipulated by recent tax legislation. In early 2016, shareholders of record received information regarding the percentage of distributions that are eligible for lower individual income tax rates. The amount will be the maximum amount allowed.

Recent tax legislation allows a regulated investment company to designate distributions not designated as capital gain distributions, as either interest related dividends or short-term capital gain dividends, both of which are exempt from the U.S. withholding tax applicable to non U.S. taxpayers. For the reporting period, the maximum amount allowable but not less than $125,790 of the ordinary distributions to be paid by the Fund qualifies as an interest related dividend and the maximum amount allowable but not less than $6,209 of the short-term capital gain distribution to be paid by the Fund qualifies as a short-term capital gain dividend.

The foregoing information is presented to assist shareholders in reporting distributions received from the Fund to the Internal Revenue Service. Because of the complexity of the federal regulations which may affect your individual tax return and the many variations in state and local tax regulations, we recommend that you consult your tax advisor for specific guidance.

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PORTFOLIO PROXY VOTING POLICIES AND GUIDELINES;

UPDATES TO STATEMENTS OF INVESTMENTS Unaudited

The Fund has adopted Portfolio Proxy Voting Policies and Guidelines under which the Fund votes proxies relating to securities (“portfolio proxies”) held by the Fund. A description of the Fund’s Portfolio Proxy Voting Policies and Guidelines is available (i) without charge, upon request, by calling the Fund toll-free at 1.800.CALL OPP (225.5677), (ii) on the Fund’s website at www.oppenheimerfunds.com, and (iii) on the SEC’s website at www.sec.gov. In addition, the Fund is required to file Form N-PX, with its complete proxy voting record for the 12 months ended June 30th, no later than August 31st of each year. The Fund’s voting record is available (i) without charge, upon request, by calling the Fund toll-free at 1.800.CALL OPP (225.5677), and (ii) in the Form N-PX filing on the SEC’s website at www.sec.gov.

The Fund files its complete schedule of portfolio holdings with the SEC for the first quarter and the third quarter of each fiscal year on Form N-Q. The Fund’s Form N-Q filings are available on the SEC’s website at www.sec.gov. Those forms may be reviewed and copied at the SEC’s Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling 1-800-SEC-0330.

Householding—Delivery of Shareholder Documents

This is to inform you about OppenheimerFunds’ “householding” policy. If more than one member of your household maintains an account in a particular fund, OppenheimerFunds will mail only one copy of the fund’s prospectus (or, if available, the fund’s summary prospectus), annual and semiannual report and privacy policy. The consolidation of these mailings, called householding, benefits your fund through reduced mailing expense, and benefits you by reducing the volume of mail you receive from OppenheimerFunds. Householding does not affect the delivery of your account statements.

Please note that we will continue to household these mailings for as long as you remain an OppenheimerFunds shareholder, unless you request otherwise. If you prefer to receive multiple copies of these materials, please call us at 1.800.CALL-OPP (225-5677). You may also notify us in writing or via email. We will begin sending you individual copies of the prospectus (or, if available, the summary prospectus), reports and privacy policy within 30 days of receiving your request to stop householding.

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TRUSTEES AND OFFICERS Unaudited

Name, Position(s) Held with the Fund, Length of Service, Year of Birth	Principal Occupation(s) During the Past 5 Years; Other Trusteeships/Directorships Held; Number of Portfolios in the Fund Complex Currently Overseen
INDEPENDENT TRUSTEES	The address of each Trustee in the chart below is 6803 S. Tucson Way, Centennial, Colorado 80112-3924. Each Trustee serves for an annual term, or until his or her resignation, retirement, death or removal.
Brian F. Wruble, Chairman of the Board of Trustees (since 2007), Trustee (since 2005) Year of Birth: 1943	Governor and Vice Chairman of Community Foundation of the Florida Keys (non-profit) (since July 2012); Trustee of the Board of Trustees, The Jackson Laboratory (non-profit) (1991-2011 and since May 2014); Chairman Emeritus (since August 2011) of The Jackson Laboratory (non-profit); Member of Zurich Insurance Group’s Investment Management Advisory Council (insurance) (since 2004); Treasurer (since 2007) and Trustee of the Institute for Advanced Study (non-profit educational institute) (since May 1992); Director of Special Value Opportunities Fund, LLC (registered investment company) (affiliate of the Sub-Adviser’s parent company) (September 2004-June 2015); General Partner of Odyssey Partners, L.P. (hedge fund) (September 1995-December 2007); Special Limited Partner of Odyssey Investment Partners, LLC (private equity investment) (January 1999-September 2004). Oversees 55 portfolios in the OppenheimerFunds complex. Mr. Wruble has served on the Boards of certain Oppenheimer funds since April 2001, during which time he has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Boards’ deliberations.
Beth Ann Brown, Trustee (since 2016) Year of Birth: 1968	Advisor, Board of Advisors of Caron Engineering Inc. (since December 2014); Independent Consultant (since September 2012); held the following positions at Columbia Management Investment Advisers LLC: Head of Intermediary Distribution (2008-2012), Managing Director, Strategic Relations (2005-2008), Managing Director, Head of National Accounts (2004-2005); Senior Vice President, National Account Manager (2002-2004), Senior Vice President, Key Account Manager (1999-2002) and Vice President, Key Account Manager (1996-1999) of Liberty Funds Distributor, Inc.; President and Director, of Acton Shapleigh Youth Conservation Corps (non-profit) (since 2012); and Vice President and Director of Grahamtastic Connection (non-profit) (since May 2013). Oversees 55 portfolios in the OppenheimerFunds complex. Ms. Brown has served on the Boards of certain Oppenheimer funds since January 2016, during which time she has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Boards’ deliberations.
Matthew P. Fink, Trustee (since 2005) Year of Birth: 1941	Trustee of the Committee for Economic Development (policy research foundation) (2005-2011); Director of ICI Education Foundation (education foundation) (October 1991-August 2006); President of the Investment Company Institute (trade association) (October 1991-June 2004); Director of ICI Mutual Insurance Company (insurance company) (October 1991-June 2004); Author of The Rise of Mutual Funds: An Insider’s View published by Oxford University Press (second edition 2011). Oversees 55 portfolios in the OppenheimerFunds complex. Mr. Fink has served on the Boards of certain Oppenheimer funds since January 2005, during which time he has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Boards’ deliberations.

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TRUSTEES AND OFFICERS Unaudited / Continued

Edmund P. Giambastiani, Jr., Trustee (since 2013) Year of Birth: 1948

Advisory Board Member of the Maxwell School of Citizenship and Public Affairs of Syracuse University (since April 2012); Director of Mercury Defense Systems Inc. (information technology) (August 2011-February 2013); Trustee of the U.S. Naval Academy Foundation (since November 2010); Advisory Board Member of the Massachusetts Institute of Technology Lincoln Laboratory (federally-funded research development center) (since May 2010); Director of The Boeing Company (aerospace and defense) (since October 2009); Trustee of MITRE Corporation (federally-funded research development center) (since September 2008); Independent Director of QinetiQ Group Plc (defense technology and security) (February 2008-August 2011); Chairman of Monster Worldwide, Inc. (on-line career services) (since March 2015), Lead Director (June 2011-March 2015); Chairman of Alenia North America, Inc. (military and defense products) (January 2008-October 2009); Director of SRA International, Inc. (information technology and services) (January 2008-July 2011); President of Giambastiani Group LLC (national security and energy consulting) (since October 2007); United States Navy, career nuclear submarine officer (June 1970-October 2007), Vice Chairman of the Joint Chiefs of Staff (2005-October 2007), Supreme Allied Commander of NATO Commander Transformation (2003-2005), Commander, U.S. Joint Forces Command (2002-2005). Since his retirement from the U.S. Navy in October 2007, Admiral Giambastiani has also served on numerous U.S. Government advisory boards, investigations and task forces for the Secretaries of Defense, State and Interior and the Central Intelligence Agency. He currently serves as a federal commissioner on the Military Compensation and Retirement Modernization Commission. Oversees 55 portfolios in the OppenheimerFunds complex. Admiral Giambastiani has served on the Boards of certain Oppenheimer funds since February 2013, during which time he has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Boards’ deliberations. For purposes of this report, Admiral Giambastiani is identified as a Trustee.

Elizabeth Krentzman, Trustee (since 2014) Year of Birth: 1959

Advisory Board Member of the University of Florida Law Center Association (since 2016) and the Securities and Exchange Commission Historical Society (since 2007); held the following positions at Deloitte & Touche LLP: Principal and Chief Regulatory Advisor for Asset Management Services (2007-2014) and U.S. Mutual Fund Leader (2011-2014); General Counsel of the Investment Company Institute (trade association) (June 2004-April 2007); held the following positions at Deloitte & Touche LLP: National Director of the Investment Management Regulatory Consulting Practice (1997-2004), Principal (2003-2004), Director (1998-2003) and Senior Manager (1997-1998); Assistant Director of the Division of Investment Management – Office of Disclosure and Investment Adviser Regulation (1996- 1997) and various positions with the Division of Investment Management – Office of Regulatory Policy (1991-1996) of the U.S. Securities and Exchange Commission; Associate at Ropes & Gray (1987-1991). Oversees 55 portfolios in the OppenheimerFunds complex. Ms. Krentzman has served on the Boards of certain Oppenheimer funds since August 2014, during which time she has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Boards’ deliberations.

32      OPPENHEIMER MONEY MARKET FUND

Mary F. Miller, Trustee (since 2004) Year of Birth: 1942	Trustee of International House (not-for-profit) (since June 2007); Trustee of the American Symphony Orchestra (not-for-profit) (October 1998-November 2011); and Senior Vice President and General Auditor of American Express Company (financial services company) (July 1998-February 2003). Oversees 55 portfolios in the OppenheimerFunds complex. Ms. Miller has served on the Boards of certain Oppenheimer funds since August 2004, during which time she has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Boards’ deliberations.
Joel W. Motley, Trustee (since 2002) Year of Birth: 1952	Director of Greenwall Foundation (since October 2013); Member of Board and Investment Committee of The Greenwall Foundation (since April 2013); Member of the Vestry of Trinity Wall Street (since April 2012); Director of Southern Africa Legal Services Foundation (since March 2012); Board Member of Pulitzer Center for Crisis Reporting (non-profit journalism) (since March 2011); Managing Director of Public Capital Advisors, LLC (privately-held financial advisor) (since January 2006); Managing Director of Carmona Motley, Inc. (privately-held financial advisor) (since January 2002); Director of Columbia Equity Financial Corp. (privately-held financial advisor) (2002-2007); Managing Director of Carmona Motley Hoffman Inc. (privately-held financial advisor) (January 1998-December 2001); Member of the Finance and Budget Committee of the Council on Foreign Relations, Member of the Investment Committee and Board of Human Rights Watch (since July 2000) and Member of the Investment Committee and Board of Historic Hudson Valley (since February 2010). Oversees 55 portfolios in the OppenheimerFunds complex. Mr. Motley has served on the Boards of certain Oppenheimer funds since October 2002, during which time he has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Boards’ deliberations.
Joanne Pace, Trustee (since 2012) Year of Birth: 1958	Advisory Board Director of Massey Quick and Company, LLC (since October 2014); Board Director of Horizon Blue Cross Blue Shield of New Jersey (since November 2012); Advisory Board Director of The Alberleen Group LLC (since March, 2012); Board Member (since January 2015), Advisory Council Member (December 2012-December 2014) of 100 Women in Hedge Funds (non-profit) (since December, 2012); Advisory Council Member of Morgan Stanley Children’s Hospital (non-profit) (since May, 2012); Board Director of The Komera Project (non-profit) (since April, 2012); New York Advisory Board Director of Peace First (non-profit) (2010-2015); Senior Advisor of SECOR Asset Management, LP (2010-2011); Managing Director and Chief Operating Officer of Morgan Stanley Investment Management (2006-2010); Partner and Chief Operating Officer of FrontPoint Partners, LLC (hedge fund) (2005-2006); held the following positions at Credit Suisse: Managing Director (2003-2005); Global Head of Human Resources and member of Executive Board and Operating Committee (2004-2005), Global Head of Operations and Product Control (2003-2004); held the following positions at Morgan Stanley: Managing Director (1997-2003), Controller and Principal Accounting Officer (1999-2003); Chief Financial Officer (temporary assignment) for the Oversight Committee, Long Term Capital Management (1998-1999). Lead Independent Director and Chair of the Audit and Nominating Committee of The Global Chartist Fund, LLC of Oppenheimer Asset Management (2011-2012); Board Director of Managed Funds Association (2008-2010); Board Director of Morgan

33      OPPENHEIMER MONEY MARKET FUND

TRUSTEES AND OFFICERS Unaudited / Continued

Joanne Pace, Continued	Stanley Foundation (2007-2010) and Investment Committee Chair (2008-2010). Oversees 55 portfolios in the OppenheimerFunds complex. Ms. Pace has served on the Boards of certain Oppenheimer funds since November 2012, including as an Advisory Board Member for certain Oppenheimer funds, during which time she has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Board’s deliberations. For purposes of this report, Ms. Pace is identified as a Trustee.
Daniel Vandivort, Trustee (since 2014) Year of Birth: 1954	Chairman and Lead Independent Director/Trustee (March 2010-September 2014), Chairman of the Audit Committee (March 2009-September 2014) and Director/ Trustee (December 2008-September 2014) of the Board of Directors/Trustees of Value Line Funds; Trustee, Board of Trustees of Huntington Disease Foundation of America (since January 2015 and June 2007-December 2013): Trustee, Board of Trustees, RIM Retirement Savings Plan (2005-2007); President and Chief Investment Officer, Robeco Investment Management, formerly known as Weiss Peck and Greer (January 2005-June 2007); Member, Management Committee of Robeco Investment Management (2001-2007); Chairman and Trustee of the Board of Trustees of Weiss, Peck and Greer Funds (2004-2005); Managing Director and Head of Fixed Income, Weiss, Peck and Greer (November 1994-January 2005); Managing Director and Head of Fixed Income, CS First Boston Investment Management (January 1992-November 1994); Director, Global Product Development, First Boston Asset Management (November 1989 to January 1992); Vice President, Fixed Income Sales, First Boston Corp. (May 1984-November 1989). Oversees 55 portfolios in the OppenheimerFunds complex. Mr. Vandivort has served on the Boards of certain Oppenheimer funds since 2014, during which time he has become familiar with the Fund’s (and other Oppenheimer funds’) financial, accounting, regulatory and investment matters and has contributed to the Boards’ deliberations.
INTERESTED TRUSTEES	Mr. Steinmetz is an “Interested Trustee” because he is affiliated with the Manager and the Sub-Adviser by virtue of his positions as Chairman of the Sub-Adviser and officer and director of the Manager. Both as a Trustee and as an officer, Mr. Steinmetz serves for an indefinite term, or until his resignation, retirement, death or removal. Mr. Steinmetz’s address is 225 Liberty Street, New York, New York 10281-1008.
Arthur P. Steinmetz, Trustee (since 2015), President and Principal Executive Officer (since 2014) Year of Birth: 1958	Chairman of the Sub-Adviser (since January 2015); CEO and Chairman of the Manager (since July 2014), President of the Manager (since May 2013), a Director of the Manager (since January 2013), Director of the Sub-Adviser (since July 2014), President, Management Director and CEO of Oppenheimer Acquisition Corp. (the Sub-Adviser’s parent holding company) (since July 2014), and President and Director of OFI SteelPath, Inc. (since January 2013). Chief Investment Officer of the OppenheimerFunds advisory entities from (January 2013-December 2013); Executive Vice President of the Manager (January 2013-May 2013); Chief Investment Officer of the Sub-Adviser (October 2010-December 2012); Chief Investment Officer, Fixed-Income, of the Sub-Adviser (April 2009-October 2010); Executive Vice President of the Sub-Adviser (October 2009-December 2012); Director of Fixed Income of the Sub-Adviser (January 2009-April 2009); and a Senior Vice President of the Sub-Adviser (March 1993-September 2009). An officer of 101 portfolios in the OppenheimerFunds complex.
OTHER OFFICERS OF THE FUND	The addresses of the Officers in the chart below are as follows: for Mss. Lo Bessette, Sexton and Picciotto, 225 Liberty Street, New York, New York 10281-1008, for Messrs. Proctor, Wilde and Petersen, 6803 S. Tucson Way, Centennial, Colorado 80112-3924. Each Officer serves for an indefinite term or until his or her resignation, retirement, death or removal.

34      OPPENHEIMER MONEY MARKET FUND

Christopher Proctor, Vice President (since 2010) Year of Birth: 1968	Head of the Cash Strategies Team (since July 2013); Senior Vice President of the Sub-Adviser (since July 2013) and Senior Portfolio Manager of the Sub-Adviser (since January 2010). Vice President of the Sub-Adviser (August 2008-July 2013). Vice President at Calamos Asset Management (January 2007-March 2008) and Scudder-Kemper Investments (1999-2002). Managing Director and Co-Founder of Elmhurst Capital Management (June 2004-January 2007); Senior Manager of Research for Etrade Global Asset Management (2002-2004). A portfolio manager and officer of other portfolios in the OppenheimerFunds complex.
Adam S. Wilde, Vice President (since 2013) Year of Birth: 1978	Vice President of the Sub-Adviser (since May 2011) and a Portfolio Manager of the Sub-Adviser (since July 2013). He served as the head of credit research for the cash strategies team of the Sub-Adviser (from 2011 to 2013), and as an Assistant Vice President and senior research analyst of the Sub-Adviser (from 2008 to 2011). Mr. Wilde served as an intermediate research analyst of the Sub-Adviser (from 2007 to 2008) and served in other analyst roles of the Sub-Adviser (since 2002). Mr. Wilde joined the Sub-Adviser in 2001. A portfolio manager and officer of other portfolios in the OppenheimerFunds complex.
Cynthia Lo Bessette, Secretary and Chief Legal Officer (since 2016) Year of Birth: 1969	Senior Vice President and Deputy General Counsel (March 2015-February 2016) and Executive Vice President, General Counsel and Secretary of the Manager (since February 2016); Chief Legal Officer of the Sub-Adviser and the Distributor (since February 2016); Vice President, General Counsel and Secretary of Oppenheimer Acquisition Corp. (since February 2016); General Counsel of OFI SteelPath, Inc., VTL Associates, LLC and Index Management Solutions, LLC (since February 2016); Chief Legal Officer of OFI Global Institutional, Inc., HarbourView Asset Management Corporation, OFI Global Trust Company, Oppenheimer Real Asset Management, Inc., OFI Private Investments Inc., Shareholder Services, Inc. and Trinity Investment Management Corporation (since February 2016); Vice President, Corporate Counsel (February 2012-March 2015) and Deputy Chief Legal Officer (April 2013-March 2015) of Jennison Associates LLC; Assistant General Counsel (April 2008-September 2009) and Deputy General Counsel (October 2009-February 2012) of Lord Abbett & Co. LLC. An officer of 101 portfolios in the OppenheimerFunds complex.
Jennifer Sexton, Vice President and Chief Business Officer (since 2014) Year of Birth: 1969	Senior Vice President of OppenheimerFunds Distributor, Inc. (since June 2014); Vice President of OppenheimerFunds Distributor, Inc. (April 2006-June 2014); Vice President of the Sub-Adviser (January 1998-March 2006); Assistant Vice President of the Sub-Adviser (October 1991-December 1998). An officer of 101 portfolios in the OppenheimerFunds complex.
Mary Ann Picciotto, Chief Compliance Officer and Chief Anti-Money Laundering Officer (since 2014) Year of Birth: 1973	Senior Vice President and Chief Compliance Officer of the Manager (since March 2014); Chief Compliance Officer of the Sub-Adviser, OFI SteelPath, Inc., OFI Global Trust Company, OFI Global Institutional, Inc., Oppenheimer Real Asset Management, Inc., OFI Private Investments, Inc., Harborview Asset Management Corporation, Trinity Investment Management Corporation, and Shareholder Services, Inc. (since March 2014); Managing Director of Morgan Stanley Investment Management Inc. and certain of its various affiliated entities; Chief Compliance Officer of various Morgan Stanley Funds (May 2010-January 2014); Chief Compliance Officer of Morgan Stanley Investment Management Inc. (April 2007-January 2014). An officer of 101 portfolios in the OppenheimerFunds complex.

35      OPPENHEIMER MONEY MARKET FUND

TRUSTEES AND OFFICERS Unaudited / Continued

Brian S. Petersen, Treasurer and Principal Financial & Accounting Officer (since 2016) Year of Birth: 1970 Vice President of the Manager (since January 2013); Vice President of the Sub-Adviser (February 2007-December 2012); Assistant Vice President of the Sub-Adviser (August 2002-2007). An officer of 101 portfolios in the OppenheimerFunds complex.

The Fund’s Statement of Additional Information contains additional information about the Fund’s Trustees and Officers and is available without charge upon request, by calling 1.800.CALL OPP (225.5677).

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OPPENHEIMER MONEY MARKET FUND

Manager	OFI Global Asset Management, Inc.
Sub-Adviser	OppenheimerFunds, Inc.
Distributor	OppenheimerFunds Distributor, Inc.
Transfer and Shareholder Servicing Agent	OFI Global Asset Management, Inc.
Sub-Transfer Agent	Shareholder Services, Inc.
	DBA OppenheimerFunds Services
Independent Registered Public Accounting Firm	KPMG LLP
Legal Counsel	Kramer Levin Naftalis & Frankel LLP

© 2016 OppenheimerFunds, Inc. All rights reserved.

37      OPPENHEIMER MONEY MARKET FUND

PRIVACY POLICY NOTICE

As an Oppenheimer fund shareholder, you are entitled to know how we protect your personal information and how we limit its disclosure.

Information Sources

We obtain nonpublic personal information about our shareholders from the following sources:

● Applications or other forms

● When you create a user ID and password for online account access

● When you enroll in eDocs Direct, our electronic document delivery service

● Your transactions with us, our affiliates or others

● A software program on our website, often referred to as a “cookie,” which indicates which parts of our site you’ve visited

● When you set up challenge questions to reset your password online

If you visit oppenheimerfunds.com and do not log on to the secure account information areas, we do not obtain any personal information about you. When you do log on to a secure area, we do obtain your user ID and password to identify you. We also use this information to provide you with products and services you have requested, to inform you about products and services that you may be interested in and assist you in other ways.

We do not collect personal information through our website unless you willingly provide it to us, either directly by email or in those areas of the website that request information. In order to update your personal information (including your mailing address, email address and phone number) you must first log on and visit your user profile.

If you have set your browser to warn you before accepting cookies, you will receive the warning message with each cookie. You can refuse cookies by turning them off in your browser. However, doing so may limit your access to certain sections of our website.

We use cookies to help us improve and manage our website. For example, cookies help us recognize new versus repeat visitors to the site, track the pages visited, and enable some special features on the website. This data helps us provide a better service for our website visitors.

Protection of Information

We do not disclose any non-public personal information (such as names on a customer list) about current or former customers to anyone, except as permitted by law.

Disclosure of Information

Copies of confirmations, account statements and other documents reporting activity in your fund accounts are made available to your financial advisor (as designated by you). We may also use details about you and your investments to help us, our financial service affiliates, or firms that jointly market their financial products and services with ours, to better serve your investment needs or suggest financial services or educational material that may be of interest to you. If this requires us to provide you with an opportunity to “opt in” or “opt out” of such information sharing with a firm not affiliated with us, you will receive notification on how to do so, before any such sharing takes place.

Right of Refusal

We will not disclose your personal information to unaffiliated third parties (except as permitted by law), unless we first offer you a reasonable opportunity to refuse or “opt out” of such disclosure.

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Internet Security and Encryption

In general, the email services provided by our website are encrypted and provide a secure and private means of communication with us. To protect your own privacy, confidential and/or personal information should only be communicated via email when you are advised that you are using a secure website. As a security measure, we do not include personal or account information in non-secure emails, and we advise you not to send such information to us in non-secure emails. Instead, you may take advantage of the secure features of our website to encrypt your email correspondence. To do this, you will need to use a browser that supports Secure Sockets Layer (SSL) protocol.

We do not guarantee or warrant that any part of our website, including files available for download, are free of viruses or other harmful code. It is your responsibility to take appropriate precautions, such as use of an anti-virus software package, to protect your computer hardware and software.

● All transactions, including redemptions, exchanges and purchases, are secured by SSL and 256-bit encryption. SSL is used to establish a secure connection between your PC and OppenheimerFunds’ server. It transmits information in an encrypted and scrambled format.

● Encryption is achieved through an electronic scrambling technology that uses a “key” to code and then decode the data. Encryption acts like the cable converter box you may have on your television set. It scrambles data with a secret code so that no one can make sense of it while it is being transmitted. When the data reaches its destination, the same software unscrambles the data.

● You can exit the secure area by either closing your browser, or for added security, you can use the Log Out button before you close your browser.

Other Security Measures

We maintain physical, electronic and procedural safeguards to protect your personal account information. Our employees and agents have access to that information only so that they may offer you products or provide services, for example, when responding to your account questions.

How You Can Help

You can also do your part to keep your account information private and to prevent unauthorized transactions. If you obtain a user ID and password for your account, do not allow it to be used by anyone else. Also, take special precautions when accessing your account on a computer used by others.

Who We Are

This joint notice describes the privacy policies of the Oppenheimer funds, OppenheimerFunds, Inc., each of its investment adviser subsidiaries, OppenheimerFunds Distributor, Inc. and OFI Global Trust Co. It applies to all Oppenheimer fund accounts you presently have, or may open in the future, using your Social Security number—whether or not you remain a shareholder of our funds. This notice was last updated March 2015. In the event it is updated or changed, we will post an updated notice on our website at oppenheimerfunds.com. If you have any questions about this privacy policy, write to us at P.O. Box 5270, Denver, CO 80217-5270, email us by clicking on the Contact Us section of our website at oppenheimerfunds.com or call us at 1.800.CALL OPP (225.5677).

39      OPPENHEIMER MONEY MARKET FUND

	Visit us at oppenheimerfunds.com for 24-hr access to account information and transactions or call us at 800.CALL OPP (800.225.5677) for 24-hr automated information and automated transactions. Representatives also available Mon–Fri 8am-8pm ET.
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	Oppenheimer funds are distributed by OppenheimerFunds Distributor, Inc. 225 Liberty Street, New York, NY 10281-1008 © 2016 OppenheimerFunds Distributor, Inc. All rights reserved. RA0200.001.0716 September 12, 2016

Item 2.  Code of Ethics.

The registrant has adopted a code of ethics that applies to the registrant’s principal executive officer, principal financial officer, principal accounting officer or controller or persons performing similar functions.

Item 3.  Audit Committee Financial Expert.

The Board of Trustees of the registrant has determined that Joanne Pace, the Board’s Audit Committee Chairwoman, is an audit committee financial expert and that Ms. Pace is “independent” for purposes of this Item 3.

Item 4.  Principal Accountant Fees and Services.

(a) Audit Fees

The principal accountant for the audit of the registrant’s annual financial statements billed $25,400 in fiscal 2016 and $24,200 in fiscal 2015.

(b) Audit-Related Fees

The principal accountant for the audit of the registrant’s annual financial statements billed $254 in fiscal 2016 and no such fees in fiscal 2015.

The principal accountant for the audit of the registrant’s annual financial statements billed $736,335 in fiscal 2016 and $897,697 in fiscal 2015 to the registrant’s investment adviser or any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant.

Such services include: Internal control reviews, GIPS attestation procedures, additional audit services, custody exams and system conversion testing

(c) Tax Fees

The principal accountant for the audit of the registrant’s annual financial statements billed no such fees in fiscal 2016 and no such fees in fiscal 2015.

The principal accountant for the audit of the registrant’s annual financial statements billed $298,261 in fiscal 2016 and $559,556 in fiscal 2015 to the registrant’s investment adviser or any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant.

Such services include: tax compliance, tax planning and tax advice. Tax compliance generally involves preparation of original and amended tax returns, claims for a refund and tax payment-planning services. Tax planning and tax advice includes assistance with tax audits and appeals, tax advice related to mergers and acquisitions and requests for rulings or technical advice from taxing authorities.

(d) All Other Fees

The principal accountant for the audit of the registrant’s annual financial statements billed no such fees in fiscal 2016 and no such fees in fiscal 2015.

The principal accountant for the audit of the registrant’s annual financial statements billed no such fees in fiscal 2016 and no such fees in fiscal 2015 to the registrant’s investment adviser or any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant.

Such fees would include the cost to the principal accountant of attending audit committee meetings and consultations regarding the registrant’s retirement plan with respect to its Trustees.

(e) (1) During its regularly scheduled periodic meetings, the registrant’s audit committee will pre-approve all audit, audit-related, tax and other services to be provided by the principal accountants of the registrant.

The audit committee has delegated pre-approval authority to its Chairwoman for any subsequent new engagements that arise between regularly scheduled meeting dates provided that any fees such pre-approved are presented to the audit committee at its next regularly scheduled meeting.

Under applicable laws, pre-approval of non-audit services may be waived provided that: 1) the aggregate amount of all such services provided constitutes no more than five percent of the total amount of fees paid by the registrant to its principal accountant during the fiscal year in which services are provided 2) such services were not recognized by the registrant at the time of engagement as non-audit services and 3) such services are promptly brought to the attention of the audit committee of the registrant and approved prior to the completion of the audit.

(2) 0%

(f) Not applicable as less than 50%.

(g) The principal accountant for the audit of the registrant’s annual financial statements billed $1,034,850 in fiscal 2016 and $1,457,253 in fiscal 2015 to the registrant and the registrant’s investment adviser or any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant related to non-audit fees. Those billings did not include any prohibited non-audit services as defined by the Securities Exchange Act of 1934.

(h) The registrant’s audit committee of the board of Trustees has considered whether the provision of non-audit services that were rendered to the registrant’s investment adviser, and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant’s independence. No such services were rendered.

Item 5.  Audit Committee of Listed Registrants

Not applicable.

Item 6.  Schedule of Investments.

a) Not applicable. The complete schedule of investments is included in Item 1 of this Form N-CSR.

b) Not applicable.

Item 7.  Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies.

Not applicable.

Item 8.  Portfolio Managers of Closed-End Management Investment Companies.

Not applicable.

Item 9.  Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers.

Not applicable.

Item 10.  Submission of Matters to a Vote of Security Holders.

The Fund’s Governance Committee Provisions with Respect to Nominations of Directors/Trustees to the Respective Boards

None

Item 11.  Controls and Procedures.

Based on their evaluation of the registrant’s disclosure controls and procedures (as defined in rule 30a-3(c) under the Investment Company Act of 1940 (17 CFR 270.30a-3(c)) as of 7/31/2016, the registrant’s principal executive officer and principal financial officer found the registrant’s disclosure controls and procedures to provide reasonable assurances that information required to be disclosed by the registrant in the reports that it files under the Securities Exchange Act of 1934 (a) is accumulated and communicated to registrant’s management, including its principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure, and (b) is recorded, processed, summarized and reported, within the time periods specified in the rules and forms adopted by the U.S. Securities and Exchange Commission.

There have been no changes in the registrant’s internal controls over financial reporting that occurred during the registrant’s second fiscal quarter of the period covered by this report that

have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 12.  Exhibits.

(a) (1) Exhibit attached hereto.

(2) Exhibits attached hereto.

(3) Not applicable.

(b) Exhibit attached hereto.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Oppenheimer Money Market Fund
By:	/s/ Arthur P. Steinmetz
	Arthur P. Steinmetz
	Principal Executive Officer
Date:	9/14/2016

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By:	/s/ Arthur P. Steinmetz
	Arthur P. Steinmetz
	Principal Executive Officer
Date:	9/14/2016
By:	/s/ Brian S. Petersen
	Brian S. Petersen
	Principal Financial Officer
Date:	9/14/2016