Oppenheimer Institutional Government Money Market Fund

Semiannual Report

11/30/2017

OppenheimerFunds^®

The Right Way

to Invest

Oppenheimer

Institutional

Government Money

Market Fund

0001193125-18-033323.txt : 20180206 0001193125-18-033323.hdr.sgml : 20180206 20180206161133 ACCESSION NUMBER: 0001193125-18-033323 CONFORMED SUBMISSION TYPE: N-CSRS PUBLIC DOCUMENT COUNT: 9 CONFORMED PERIOD OF REPORT: 20171130 FILED AS OF DATE: 20180206 DATE AS OF CHANGE: 20180206 EFFECTIVENESS DATE: 20180206 FILER: COMPANY DATA: COMPANY CONFORMED NAME: Oppenheimer Institutional Government Money Market Fund CENTRAL INDEX KEY: 0001358587 IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 0531 FILING VALUES: FORM TYPE: N-CSRS SEC ACT: 1940 Act SEC FILE NUMBER: 811-21888 FILM NUMBER: 18577736 BUSINESS ADDRESS: STREET 1: 6803 SOUTH TUCSON WAY CITY: CENTENNIAL STATE: CO ZIP: 80112-3924 BUSINESS PHONE: 1-303-768-3200 MAIL ADDRESS: STREET 1: 6803 SOUTH TUCSON WAY CITY: CENTENNIAL STATE: CO ZIP: 80112-3924 FORMER COMPANY: FORMER CONFORMED NAME: Oppenheimer Institutional Money Market Fund DATE OF NAME CHANGE: 20060406

0001358587 S000012567 Oppenheimer Institutional Government Money Market Fund

C000034179 E

C000034180 L

C000034181 P

N-CSRS 1 d521357dncsrs.htm OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND Oppenheimer Institutional Government Money Market Fund

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 811-21888

Oppenheimer Institutional Government 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: May 31

Date of reporting period: 11/30/2017

Item 1. Reports to Stockholders.

Table of Contents


Fund Performance Discussion			3

Portfolio Allocation			4

Fund Expenses			6

Statement of Investments			8

Statement of Assets and Liabilities			14

Statement of Operations			15

Statements of Changes in Net Assets			16

Financial Highlights			17

Notes to Financial Statements			20

Board Approval of the Fund’s Investment Advisory and Sub-Advisory Agreements			29

Portfolio Proxy Voting Policies and Guidelines; Updates to Statements of Investments			32

Trustees and Officers			33

Privacy Notice			34

2 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

Fund Update

On September 28, 2016, the Fund converted from Oppenheimer Institutional Money Market Fund to Oppenheimer Institutional Government Money Market Fund. As such, the Fund now operates as a government money market fund, which requires that it invest 99.5 percent or more of its total assets in cash, government securities and/or repurchase agreements that are collateralized solely by government securities or cash. As a government money market fund, the Fund invests primarily in government agency securities, such as Federal Home Loan Bank System obligations, and short-term repurchase agreements collateralized by agency and treasury securities. Under the new rules adopted by the Securities and Exchange Commission (“SEC”) effective in October 14, 2016, the Fund posts current and historical Fund metrics on the oppenheimerfunds.com website. Among these are the market based NAV, Daily Liquid Assets, Weekly Liquid Assets and Fund Net Inflows or Outflows.

FUND PERFORMANCE DISCUSSION

Throughout the reporting period, the Fund continued to offer very strong liquidity and a stable $1.00 net asset value (NAV), while providing competitive income. Short-term government market rates have risen in conjunction with the Federal Reserve (the “Fed”) raising its overnight benchmark Federal Funds rate in December of 2016,

Christopher Proctor, CFA

Portfolio Manager

March 2017 and June 2017. Currently, the market is anticipating another 25 basis point hike in December of 2017. The Fund has benefited from the uptick in rates, as positions matured and we reinvested at higher rates. We would expect that should the Fed raise its overnight rate in December, as projected, that the Fund’s yield would increase as well.

Adam S. Wilde, CFA

Portfolio Manager

3 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

Portfolio Allocation


U.S. Government Agencies			53.7%
Repurchase Agreements			44.6
Investment Companies			1.7
Portfolio holdings and allocations are subject to change. Percentages are as of November 30, 2017, and are based on the total market value of investments.

Performance

CURRENT YIELD

For the 7-Day Period Ended 11/30/17


	With Compounding	Without Compounding
Class E (IOEXX)	1.03%	1.03%
Class L (IOLXX)	0.98	0.97
Class P (IOPXX)	0.96	0.96

CURRENT YIELD

For the Six Months Ended 11/30/17


	With Compounding	Without Compounding
Class E (IOEXX)	0.95%	0.94%
Class L (IOLXX)	0.89	0.89
Class P (IOPXX)	0.89	0.89

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.

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,

4 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

and involve investment risks, including the possible loss of the principal amount invested.

You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.

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 INSTITUTIONAL GOVERNMENT 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 November 30, 2017.

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 November 30, 2017” 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 INSTITUTIONAL GOVERNMENT MONEY MARKET FUND


Actual	Beginning Account Value June 1, 2017	Ending Account Value November 30, 2017	Expenses Paid During 6 Months Ended November 30, 2017
Class E	$ 1,000.00	$ 1,004.70	$ 0.55
Class L	1,000.00	1,004.50	0.80
Class P	1,000.00	1,004.50	0.80

Hypothetical
(5% return before expenses)
Class E	1,000.00	1,024.52	0.56
Class L	1,000.00	1,024.27	0.81
Class P	1,000.00	1,024.27	0.81

Expenses are equal to the Fund’s annualized expense ratio for that class, multiplied by the average account value over the period, multiplied by 183/365 (to reflect the one-half year period). Those annualized expense ratios, excluding indirect expenses from affiliated funds, based on the 6-month period ended November 30, 2017 are as follows:


Class	Expense Ratios
Class E		0.11	%
Class L		0.16
Class P		0.16

The expense ratios reflect voluntary and/or contractual waivers and/or reimbursements of expenses by the Fund’s Distributor. 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 INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

STATEMENT OF INVESTMENTS November 30, 2017 Unaudited


	Maturity Date*		Final Legal Maturity Date**		Principal Amount		Value
U.S. Government Agencies—54.1%
Federal Agricultural Mortgage Corp.:
1.137% [US0001M+(10.5)]¹		12/4/17		9/4/18	$	35,000,000	$	35,000,000
1.213% [US0001M+(3)]¹		12/3/17		1/3/18		54,000,000		54,000,000
1.23% [FEDL01+7]¹		12/1/17		12/1/17		30,000,000		30,000,000
1.24% [FEDL01+8]¹		12/1/17		12/27/17		24,000,000		24,000,000
1.26% [FEDL01+10]¹		12/1/17		12/1/17		87,000,000		87,000,000
Federal Farm Credit Bank:
1.009% [US0003M+(32)]¹		12/26/17		12/26/17		25,000,000		24,999,191
1.071% [US0003M+(26)]¹		12/28/17		9/28/18		10,000,000		9,993,411
1.09%²		2/26/18		2/26/18		13,000,000		12,966,070
1.10%		3/14/18		3/14/18		12,810,000		12,805,646
1.109%²		1/18/18		1/18/18		10,000,000		9,985,333
1.13%²		2/13/18		2/13/18		15,000,000		14,965,467
1.162%²		3/19/18		3/19/18		11,000,000		10,962,050
1.214%²		4/24/18		4/24/18		25,000,000		24,880,000
1.232%²		5/7/18		5/7/18		10,000,000		9,946,795
1.243%²		5/31/18		5/31/18		25,000,000		24,845,396
1.247%²		4/3/18		4/3/18		10,000,000		9,957,633
1.26% [FEDL01+10]¹		12/1/17		3/14/18		35,000,000		35,000,000
1.264%²		6/7/18		6/7/18		5,000,000		4,967,361
1.265%²		6/27/18		6/27/18		10,000,000		9,927,778
1.27% [FCPR DLY+(298)]¹		12/1/17		5/14/18		39,000,000		39,007,791
1.272%²		7/16/18		7/16/18		9,000,000		8,928,747
1.314% [US0001M+5]¹		12/16/17		4/16/18		10,000,000		10,007,431
1.347% [US0003M+(1)]¹		1/19/18		10/19/18		24,200,000		24,238,354
1.35% [FCPR DLY+(290)]¹		12/1/17		5/14/18		35,000,000		35,000,000
1.403% [US0003M+0]¹		2/9/18		5/9/18		10,000,000		10,010,048
1.413% [US0001M+13]¹		12/19/17		7/19/18		10,000,000		10,016,006
1.539% [USBMMY3M+25]¹		12/1/17		2/20/18		10,000,000		10,004,594
Federal Home Loan Bank:
0.75%		1/19/18		1/19/18		14,735,000		14,727,284
0.851%		12/8/17		12/8/17		5,000,000		5,000,260
0.875%		6/29/18		6/29/18		18,990,000		18,937,889
0.875%		3/19/18		3/19/18		19,875,000		19,855,332
1.017% [US0003M+(38)]¹		2/8/18		2/8/18		25,000,000		24,994,162
1.036% [US0003M+(38)]¹		2/15/18		2/15/18		36,000,000		35,983,788
1.04%²		12/6/17		12/6/17		50,000,000		49,992,778
1.096% [US0003M+(55)]¹		1/26/18		1/26/18		75,000,000		74,999,235
1.098%²		1/31/18		1/31/18		55,850,000		55,746,551
1.10% [US0001M+(14.5)]¹		12/12/17		3/12/18		55,000,000		55,000,000
1.109% [US0001M+(13.5)]¹		12/9/17		5/9/18		35,000,000		35,000,000
1.111% [US0003M+(21)]¹		12/18/17		12/18/17		20,000,000		20,000,269
1.115%²		1/3/18		1/3/18		10,000,000		9,989,798
1.127% [US0003M+(22)]¹		1/6/18		4/6/18		35,000,000		35,000,000
1.129% [US0003M+(22)]¹		1/9/18		7/9/18		18,600,000		18,596,756
1.129% [US0003M+(19)]¹		12/14/17		9/14/18		35,000,000		35,000,000
1.131% [US0001M+(13.5)]¹		12/17/17		5/17/18		35,000,000		35,000,000

8 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND


	Maturity Date*		Final Legal Maturity Date**		Principal Amount		Value
U.S. Government Agencies (Continued)
Federal Home Loan Bank: (Continued)
1.132%		3/9/18		3/9/18	$	40,180,000	$	40,204,328
1.132%²		1/24/18		1/24/18		147,500,000		147,250,388
1.133% [US0003M+(21)]¹		1/5/18		7/5/18		35,000,000		35,000,000
1.138% [US0001M+(14.5)]¹		12/20/17		4/20/18		30,000,000		29,999,479
1.141%²		1/26/18		1/26/18		125,000,000		124,779,040
1.141% [US0003M+(18)]¹		12/16/17		3/16/18		74,000,000		74,017,183
1.142%²		12/22/17		12/22/17		20,000,000		19,986,689
1.142%²		1/5/18		1/5/18		30,000,000		29,966,750
1.144%²		12/29/17		12/29/17		80,000,000		79,928,956
1.144%²		1/12/18		1/12/18		27,000,000		26,964,055
1.145%²		2/28/18		2/28/18		79,363,000		79,139,624
1.145%²		3/9/18		3/9/18		116,365,000		116,004,347
1.146%²		1/23/18		1/23/18		51,000,000		50,914,147
1.149% [US0001M+(14.5)]¹		12/22/17		3/22/18		23,000,000		23,000,000
1.15% [US0003M+(17)]¹		12/15/17		3/15/18		51,000,000		51,013,068
1.152%²		12/27/17		12/27/17		75,000,000		74,937,690
1.153% [US0001M+(13)]¹		12/20/17		8/20/18		37,000,000		37,000,000
1.153% [US0001M+(17.5)]¹		12/25/17		1/25/18		35,000,000		35,000,000
1.163% [US0001M+(16.5)]¹		12/25/17		1/25/18		30,000,000		29,999,530
1.164%²		2/23/18		2/23/18		14,800,000		14,759,941
1.165%²		1/17/18		1/17/18		97,070,000		96,922,645
1.166%²		3/7/18		3/7/18		39,253,000		39,131,577
1.173%²		1/10/18		1/10/18		135,000,000		134,824,417
1.175%		1/5/18		1/5/18		2,000,000		2,000,086
1.181%²		3/2/18		3/2/18		69,000,000		68,795,081
1.182%²		2/2/18		2/2/18		82,100,000		81,930,619
1.183% [US0001M+(14.5)]¹		12/25/17		4/25/18		90,000,000		89,998,489
1.183% [US0001M+(14.5)]¹		12/26/17		4/26/18		30,000,000		29,999,492
1.187%		8/7/18		8/7/18		37,600,000		37,430,582
1.188%²		3/19/18		3/19/18		39,000,000		38,861,790
1.189% [US0003M+(23)]¹		2/16/18		2/16/18		25,000,000		25,000,000
1.198% [US0001M+(11.5)]¹		12/23/17		8/23/18		35,000,000		35,000,000
1.198% [US0001M+(13)]¹		12/25/17		7/25/18		35,000,000		35,000,000
1.201%		4/25/18		4/25/18		38,000,000		37,983,214
1.203%²		2/1/18		2/1/18		50,000,000		49,896,667
1.205%²		3/14/18		3/14/18		20,000,000		19,931,333
1.212%²		4/6/18		4/6/18		35,000,000		34,852,388
1.224%²		2/20/18		2/20/18		46,000,000		45,873,730
1.238%²		2/9/18		2/9/18		30,000,000		29,928,016
1.24%²		4/13/18		4/13/18		34,000,000		33,845,184
1.242%²		1/19/18		1/19/18		4,045,000		4,038,173
1.255% [US0003M+(20.75)]¹		2/23/18		2/23/18		35,000,000		35,000,000
1.257%		6/8/18		6/8/18		10,000,000		9,999,650
1.259% [US0001M+1.5]¹		12/8/17		12/8/17		40,000,000		39,999,961
1.262%²		2/14/18		2/14/18		60,000,000		59,842,750
1.263% [US0003M+(20.5)]¹		2/28/18		2/28/18		50,000,000		50,002,230

9 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

STATEMENT OF INVESTMENTS Unaudited / Continued


	Maturity Date*		Final Legal Maturity Date**		Principal Amount		Value
U.S. Government Agencies (Continued)
Federal Home Loan Bank: (Continued)
1.266%²		7/27/18		7/27/18	$	6,000,000	$	5,950,417
1.269% [US0003M+(15)]¹		2/16/18		2/16/18		25,000,000		25,005,732
1.274%		7/24/18		7/24/18		33,000,000		32,995,022
1.281%		7/27/18		7/27/18		27,755,000		27,749,349
1.282%²		4/18/18		4/18/18		6,079,000		6,049,289
1.294%²		2/16/18		2/16/18		27,000,000		26,925,503
1.297%²		2/21/18		2/21/18		19,000,000		18,944,042
1.302% [US0003M+(48)]¹		2/26/18		2/26/18		74,000,000		74,009,725
1.309% [US0003M+(4)]¹		1/8/18		1/8/18		33,000,000		33,005,782
1.312% [US0001M+7]¹		12/5/17		12/5/17		33,795,000		33,795,553
1.313% [US0001M+7]¹		12/7/17		12/7/17		45,670,000		45,670,767
1.314% [US0003M+(3.5)]¹		1/8/18		1/8/18		12,000,000		12,003,811
1.318% [US0001M+7.5]¹		12/7/17		12/7/17		42,500,000		42,501,771
1.318% [US0003M+(16.25)]¹		12/1/17		3/1/18		7,000,000		7,000,378
Federal Home Loan Mortgage Corp.:
0.75%		4/9/18		4/9/18		2,380,000		2,375,204
0.865%		1/12/18		1/12/18		48,000,000		47,988,931
0.88%		3/7/18		3/7/18		4,185,000		4,181,473
0.899%		12/15/17		12/15/17		27,000,000		27,001,043
1.254%		5/25/18		5/25/18		10,700,000		10,686,958
5.00%		3/29/18		3/29/18		9,000,000		9,110,873
Federal National Mortgage Assn.:
0.875%		2/8/18		2/8/18		5,000,000		4,996,990
1.104%		3/28/18		3/28/18		18,000,000		17,981,111
1.193%		5/21/18		5/21/18		27,000,000		26,954,371
1.203%		7/20/18		7/20/18		17,000,000		16,985,351
1.264%		7/27/18		7/27/18		12,725,000		12,682,532
1.276% [US0003M+(5)]¹		12/21/17		3/21/18		58,200,000		58,236,476
Freddie Mac:
1.143%²		1/26/18		1/26/18		20,000,000		19,964,533
1.175%²		3/14/18		3/14/18		40,000,000		39,866,100
1.184%²		3/1/18		3/1/18		37,729,000		37,617,756
1.186%²		3/20/18		3/20/18		50,000,000		49,821,361
1.194%²		2/9/18		2/9/18		35,000,000		34,919,014
Tennessee Valley Authority:
1.119%		12/15/17		12/15/17		3,775,000		3,782,382
1.241%²		1/2/18		1/2/18		77,000,000		76,915,129
Total U.S. Government Agencies (Cost $4,316,867,222)								4,316,867,222
Repurchase Agreements—44.9%
Repurchase Agreements³(Cost $3,587,900,000)						3,587,900,000		3,587,900,000

					Shares
Investment Companies—1.7%
Goldman Sachs Financial Square Government Fund, 0.96%⁴						33,047,563		33,047,563

10 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND


	Shares		Value
Investment Companies (Continued)
JPMorgan U.S. Government Money Market Fund, 0.96%⁴		102,109,499		$ 102,109,498
Total Investment Companies (Cost $135,157,061)				135,157,061
Total Investments, at Value (Cost $8,039,924,283)		100.7%		8,039,924,283
Net Other Assets (Liabilities)		(0.7)		(57,832,523)

Net Assets		100.0%		$ 7,982,091,760

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, determined as [Referenced Rate + Basis-point spread].

2. Zero coupon bond reflects effective yield on the original acquisition date.

3. Repurchase agreements:

Counterparty

Lending
Rate

Settlement Date

Maturity
Date

Principal
Amount

Credit Agricole Corp. & Investment Bank

1.04%

11/30/17

12/1/17

$527,600,000

Credit Agricole Corp. & Investment Bank

1.04

11/29/17

12/6/17

120,000,000

Credit Agricole Corp. & Investment Bank

1.06

11/29/17

12/14/17

91,000,000

Credit Agricole Corp. & Investment Bank

1.06

11/28/17

12/5/17

103,700,000

Deutsche Bank Securities, Inc.

1.04

11/30/17

12/1/17

91,000,000

Deutsche Bank Securities, Inc.

1.05

11/29/17

12/6/17

70,000,000

Deutsche Bank Securities, Inc.

1.07

11/28/17

12/5/17

110,000,000

Deutsche Bank Securities, Inc.

1.10

11/28/17

12/14/17

68,000,000

Deutsche Bank Securities, Inc.

1.10

11/27/17

12/11/17

68,000,000

INTL FCStone Financial, Inc.

1.10

11/28/17

12/5/17

135,000,000

11 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

STATEMENT OF INVESTMENTS Unaudited / Continued

Footnotes to Statement of Investments (Continued)

Counterparty

Lending
Rate

Settlement Date

Maturity
Date

Principal
Amount

RBC Dominion Securities, Inc.

1.03%

11/29/17

12/6/17

$52,900,000

RBC Dominion Securities, Inc.

1.04

11/30/17

12/1/17

705,700,000

RBC Dominion Securities, Inc.

1.05

11/24/17

12/1/17

100,000,000

South Street Securities LLC

1.09

11/30/17

12/1/17

1,000,000,000

TD Securities (USA) LLC

1.04

11/30/17

12/1/17

220,000,000

TD Securities (USA) LLC

1.06

11/24/17

12/1/17

125,000,000


Counterparty	Collateralized By	Collateral Received, at Value^a		Repurchase Agreements, at Value		Repurchase Agreement Proceeds to be Received^a
Credit Agricole Corp. & Investment Bank	U.S. Government Agency Mortgages, 2.00%-6.50%, 11/1/20-7/20/67		$(538,167,547)		$527,600,000	$527,615,243
Credit Agricole Corp. & Investment Bank	U.S. Treasury Nts., 0.625%, 1/15/26		(122,424,850)		120,000,000	120,024,363
Credit Agricole Corp. & Investment Bank	U.S. Treasury Nts., 0.625%, 1/15/26		(92,861,010)		91,000,000	91,040,206
Credit Agricole Corp. & Investment Bank	U.S. Treasury Nts., 0.625%, 1/15/26		(105,795,840)		103,700,000	103,721,412
Deutsche Bank Securities, Inc.	U.S. Treasury Nts., 0.00%, 11/15/26		(92,822,681)		91,000,000	91,002,629
Deutsche Bank Securities, Inc.	U.S. Treasury Nts., 0.00%- 1.875%, 8/31/22-2/15/27		(71,404,230)		70,000,000	70,004,147
Deutsche Bank Securities, Inc.	U.S. Treasury Nts., 0.00%, 11/15/31		(112,210,005)		110,000,000	110,009,808
Deutsche Bank Securities, Inc.	U.S. Treasury Nts., 1.875%, 8/31/22		(69,366,427)		68,000,000	68,006,301
Deutsche Bank Securities, Inc.	U.S. Treasury Nts., 1.875%, 8/31/22		(69,368,517)		68,000,000	68,008,350
INTL FCStone Financial, Inc.	U.S. Treasury Bills, 0.00%, 12/21/17; U.S. Treasury Bonds, 3.125%, 11/15/41; U.S. Treasury Nts., 0.00%- 3.375%, 1/31/18-2/15/45 and U.S. Government Agency Mortgages, 0.00%-10.00%, 12/25/17-10/16/57		(139,743,311)		135,000,000	135,012,446
RBC Dominion Securities, Inc.	U.S. Treasury Bonds, 2.875%, 5/15/43		(53,961,166)		52,900,000	52,903,104

12 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

Footnotes to Statement of Investments (Continued)


Counterparty	Collateralized By	Collateral Received, at Value^a		Repurchase Agreements, at Value		Repurchase Agreement Proceeds to be Received^a
RBC Dominion Securities, Inc.	U.S. Government Agency Mortgages, 3.50%-4.00%, 12/1/32-7/20/47		$(719,834,795)		$705,700,000	$705,720,387
RBC Dominion Securities, Inc.	U.S. Treasury Nts., 1.375%, 4/30/20		(102,020,887)		100,000,000	100,020,477
South Street Securities LLC	U.S. Treasury Nts., 2.00%, 11/30/22 and U.S. Government Agency Mortgages, 0.00%- 9.20%, 12/13/17-5/1/50		(1,020,112,309)		1,000,000,000	1,000,031,233
TD Securities (USA) LLC	U.S. Treasury Nts., 1.375%, 1/31/21 and U.S. Treasury Bonds, 3.625%, 8/15/43		(224,406,532)		220,000,000	220,006,404
TD Securities (USA) LLC	U.S. Treasury Nts., 1.125%, 1/15/19 and U.S. Treasury Bills, 0.00%, 11/8/18		(127,526,367)		125,000,000	125,025,850

			$(3,662,026,474)		$3,587,900,000	$3,588,152,360

a. Includes accrued interest.

4. Rate shown is the 7-day yield at period end.


Glossary: Definitions
FCPR DLY		Federal Reserve Bank Prime Loan Rate US Daily
FEDL01		US Federal Funds Effective Rate (continuous series)
US0001M		ICE LIBOR USD 1 Month
US0003M		ICE LIBOR USD 3 Month
USBMMY3M		US Treasury Bill 3 Month Money Market Yield

See accompanying Notes to Financial Statements.

13 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

STATEMENT OF ASSETS AND LIABILITIES November 30, 2017 Unaudited


Assets
Investments, at value—see accompanying statement of investments:
Unaffiliated companies (cost $4,452,024,283)	$	4,452,024,283
Repurchase agreements (cost 3,587,900,000)		3,587,900,000

		8,039,924,283
Cash		441,878
Receivables and other assets:
Interest and dividends		3,686,150
Other		348,305

Total assets		8,044,400,616
Liabilities
Payables and other liabilities:
Investments purchased		55,903,626
Dividends		5,744,925
Trustees’ compensation		571,306
Shareholder communications		9,942
Distribution and service plan fees		157
Other		78,900

Total liabilities		62,308,856
Net Assets	$	7,982,091,760


Composition of Net Assets
Par value of shares of beneficial interest	$	7,982,455
Additional paid-in capital		7,974,480,829
Accumulated net investment loss		(427,707	)
Accumulated net realized gain on investments		56,183
Net Assets	$	7,982,091,760


Net Asset Value Per Share
Class E Shares:
Net asset value, redemption price (excludes applicable contingent deferred sales charge) and offering price per share (based on net assets of $7,753,355,309 and 7,753,615,389 shares of beneficial interest outstanding)		$1.00
Class L Shares:
Net asset value, redemption price (excludes applicable contingent deferred sales charge) and offering price per share (based on net assets of $220,619,845 and 220,738,024 shares of beneficial interest outstanding)		$1.00
Class P Shares:
Net asset value, redemption price (excludes applicable contingent deferred sales charge) and offering price per share (based on net assets of $8,116,606 and 8,101,313 shares of beneficial interest outstanding)		$1.00

See accompanying Notes to Financial Statements.

14 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

STATEMENT OF

OPERATIONS For the Six Months Ended November 30, 2017 Unaudited


Investment Income
Interest	$	33,276,338
Dividends		199,578

Total investment income		33,475,916
Expenses
Management fees		3,200,058
Distribution and service plan fees - Class P		10,146
Transfer and shareholder servicing agent fees:
Class L		104,491
Class P		2,029
Shareholder communications - Class L		2,928
Trustees’ compensation		42,990
Custodian fees and expenses		18,358
Other		100,626

Total expenses		3,481,626
Less waivers and reimbursements of expenses		(10,012	)

Net expenses		3,471,614
Net Investment Income		30,004,302
Net realized loss on investment transactions		(9,961	)

Net Increase in Net Assets Resulting from Operations	$	29,994,341

See accompanying Notes to Financial Statements.

15 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

STATEMENTS OF CHANGES IN NET ASSETS


	Six Months Ended
	November 30, 2017			Year Ended
	(Unaudited)			May 31, 2017
Operations
Net investment income	$	30,004,302		$	32,110,382
Net realized gain (loss)		(9,961	)		74,703

Net increase in net assets resulting from operations		29,994,341			32,185,085
Dividends and/or Distributions to Shareholders
Dividends from net investment income:
Class E		(28,243,261	)		(28,584,118	)
Class L		(1,727,276	)		(3,493,957	)
Class P		(36,088	)		(33,170	)

		(30,006,625	)		(32,111,245	)
Beneficial Interest Transactions
Net increase (decrease) in net assets resulting from beneficial interest transactions:
Class E		1,713,753,581			(604,045,129	)
Class L		(675,055,649	)		97,396,937
Class P		36,088			33,170

		1,038,734,020			(506,615,022	)
Net Assets
Total increase (decrease)		1,038,721,736			(506,541,182	)
Beginning of period		6,943,370,024			7,449,911,206

End of period (including accumulated net investment loss of $427,707 and $425,384, respectively)	$	7,982,091,760		$	6,943,370,024

See accompanying Notes to Financial Statements.

16 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS

Six Months

Ended

November 30,

Year Ended

2017

May 31,

May 29,

May 30,

May 31,

Class E

(Unaudited)

2017

2016

2015¹

2014¹

2013

Per Share Operating Data

Net asset value, beginning of period

$1.00

Income (loss) from investment operations:

Net investment income²

0.00³

Net realized and unrealized gain (loss)

(0.00)³

0.00³

Total from investment operations

0.00³

Dividends and/or distributions to shareholders:

Dividends from net investment income

(0.00)³

Net asset value, end of period

$1.00

Total Return⁴

0.47%

0.46%

0.29%

0.10%

0.09%

0.17%

Ratios/Supplemental Data

Net assets, end of period (in thousands)

$7,753,355

$6,039,613

$6,643,592

$5,783,350

$5,907,674

$5,775,156

Average net assets (in thousands)

$5,955,193

$6,279,494

$6,484,183

$6,003,856

$6,291,038

$5,689,719

Ratios to average net assets:⁵

Net investment income

0.95%

0.46%

0.29%

0.10%

0.09%

0.16%

Total expenses

0.11%

0.10%

0.11%

Expenses after payments, waivers and/or reimbursements and reduction to custodian expenses

0.11%

0.10%

0.11%

1. Represents the last business day of the Fund’s reporting period.

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

3. Less than $0.005 per share.

4. 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.

5. Annualized for periods less than one full year.

See accompanying Notes to Financial Statements.

17 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

FINANCIAL HIGHLIGHTS Continued

Six Months

Ended

November 30,

Year Ended

2017

May 31,

May 29,

May 30,

May 31,

Class L

(Unaudited)

2017

2016

2015¹

2014¹

2013

Per Share Operating Data

Net asset value, beginning of period

$1.00

Income (loss) from investment operations:

Net investment income²

0.00³

Net realized and unrealized gain (loss)

(0.00)³

0.00³

Total from investment operations

0.00³

Dividends and/or distributions to shareholders:

Dividends from net investment income

(0.00)³

Net asset value, end of period

$1.00

Total Return⁴

0.45%

0.41%

0.24%

0.05%

0.04%

0.10%

Ratios/Supplemental Data

Net assets, end of period (in thousands)

$220,620

$895,676

$798,272

$771,880

$873,074

$958,163

Average net assets (in thousands)

$405,664

$846,273

$788,320

$830,945

$874,757

$693,086

Ratios to average net assets:⁵

Net investment income

0.85%

0.41%

0.24%

0.05%

0.04%

0.10%

Total expenses

0.16%

0.17%

Expenses after payments, waivers and/or reimbursements and reduction to custodian expenses

0.16%

0.17%

1. Represents the last business day of the Fund’s reporting period.

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

3. Less than $0.005 per share.

5. Annualized for periods less than one full year.

See accompanying Notes to Financial Statements.

18 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

Six Months

Ended

November 30,

Year Ended

2017

May 31,

May 29,

May 30,

May 31,

Class P

(Unaudited)

2017

2016

2015¹

2014¹

2013

Per Share Operating Data

Net asset value, beginning of period

$1.00

Income (loss) from investment operations:

Net investment income (loss)²

0.00³

(0.00)³

0.00³

Net realized and unrealized gain (loss)

(0.00)³

0.00³

Total from investment operations

0.00³

Dividends and/or distributions to shareholders:

Dividends from net investment income

(0.00)³

Net asset value, end of period

$1.00

Total Return⁴

0.45%

0.41%

0.24%

0.02%

0.01%

0.07%

Ratios/Supplemental Data

Net assets, end of period (in thousands)

$8,117

$8,081

$8,047

$7,748

$13,797

$14,692

Average net assets (in thousands)

$8,095

$8,060

$8,024

$10,514

$14,595

$12,903

Ratios to average net assets:⁵

Net investment income

0.89%

0.41%

0.24%

0.01%

0.06%

Total expenses

0.41%

0.40%

0.41%

Expenses after payments, waivers and/or reimbursements and reduction to custodian expenses

0.16%

0.15%

0.19%

0.18%

0.21%

1. Represents the last business day of the Fund’s reporting period.

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

3. Less than $0.005 per share.

5. Annualized for periods less than one full year.

See accompanying Notes to Financial Statements.

19 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS November 30, 2017 Unaudited

1. Organization

Oppenheimer Institutional Government 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 E, Class L and Class P shares. Class E and Class L shares are sold at net asset value per share without any initial sales charge. Class E shares are only offered to other Oppenheimer Funds, the Manager and their affiliates. Class P shares will normally be sold at net asset value per share without any initial sales charge and are subject to a service plan. Class L and Class P shares are offered directly to institutional investors and may only be sold through an investment professional. Brokers or other investment professionals that offer Class L and Class P shares may impose charges on those accounts. All 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.

The tax character of distributions is determined as of the Fund’s fiscal year end. Therefore, a portion of the Fund’s distributions made to shareholders prior to the Fund’s fiscal year end may ultimately be categorized as a tax return of capital.

20 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

2. Significant Accounting Policies (Continued)

Investment Income. Dividend income is recorded on the ex-dividend date or upon ex-dividend notification in the case of certain foreign dividends where the ex-dividend date may have passed. Non-cash dividends included in dividend income, if any, are recorded at the fair value of the securities received. Withholding taxes on foreign dividends, if any, and capital gains taxes on foreign investments, if any, have been provided for in accordance with the Fund’s understanding of the applicable tax rules and regulations. 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 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 May 31, 2017, including open tax years, and does not believe there are any uncertain tax positions requiring recognition in the Fund’s financial statements.

During the fiscal year ended May 31, 2017, the Fund did not utilize any capital loss carryforward to offset capital gains realized in that fiscal year.

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

21 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS Unaudited / Continued

2. Significant Accounting Policies (Continued)

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.

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 least quarterly or more frequently, if necessary.

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.

Securities for which market quotations are not readily available or a significant event has occurred that would materially affect the value of the security, are 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. Those standardized fair valuation 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.

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 may be used

22 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

3. Securities Valuation (Continued)

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:

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 Fund classifies each of its investments in investment companies which are publicly offered as Level 1. Investment companies that are not publicly offered, if any, are measured using net asset value and are classified as Level 2 in the fair value hierarchy.

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 2—		Level 3—
	Level 1—		Other Significant		Significant
	Unadjusted		Observable		Unobservable
	Quoted Prices		Inputs		Inputs		Value

Assets Table
Investments, at Value:
U.S. Government Agencies	$	—	$	4,316,867,222	$	—	$	4,316,867,222
Repurchase Agreement		—		3,587,900,000		—		3,587,900,000
Investment Company		135,157,061		—		—		135,157,061

Total Assets	$	135,157,061	$	7,904,767,222	$	—	$	8,039,924,283

4. Investments and Risks

Investments in Money Market Instruments. The Fund is permitted to invest its free cash balances in money market instruments to provide liquidity or for defensive purposes. The Fund may invest in money market instruments directly or in other affiliated or unaffiliated money market funds.

5. 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.

23 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS Unaudited / Continued

5. Market Risk Factors (Continued)

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 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.

6. Shares of Beneficial Interest

The Fund has authorized an unlimited number of $0.001 par value shares of beneficial interest of each class. Transactions in shares of beneficial interest were as follows:


	Six Months Ended November 30, 2017						Year Ended May 31, 2017
	Shares			Amount			Shares			Amount
Class E
Sold		24,812,357,093		$	24,812,357,093			49,050,475,878		$	49,050,475,878
Dividends and/or distributions reinvested		1,593,555			1,593,555			2,108,153			2,108,153
Redeemed		(23,100,197,067	)		(23,100,197,067	)		(49,656,629,160	)		(49,656,629,160	)
Net increase (decrease)		1,713,753,581		$	1,713,753,581			(604,045,129	)	$	(604,045,129	)


Class L
Sold		691,100,887		$	691,100,887			7,905,578,093		$	7,905,578,093
Dividends and/or distributions reinvested		1,540,767			1,540,767			3,405,460			3,405,460
Redeemed		(1,367,697,303	)		(1,367,697,303	)		(7,811,586,616	)		(7,811,586,616	)
Net increase (decrease)		(675,055,649	)	$	(675,055,649	)		97,396,937		$	97,396,937

24 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

6. Shares of Beneficial Interest (Continued)


	Six Months Ended November 30, 2017				Year Ended May 31, 2017
	Shares		Amount		Shares		Amount
Class P
Sold		—	$	—		—	$	—
Dividends and/or distributions reinvested		36,088		36,088		33,170		33,170
Redeemed		—		—		—		—
Net increase		36,088	$	36,088		33,170	$	33,170

7. 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 of 0.10%.

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, which shall be calculated after any applicable fee waivers. 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:

25 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS Unaudited / Continued

7. Fees and Other Transactions with Affiliates (Continued)


Projected Benefit Obligations Increased	$	—
Payments Made to Retired Trustees		—
Accumulated Liability as of November 30, 2017		217,711

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” 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.

Distribution and Service Plan (12b-1) Fees. Under its General Distributor’s Agreement with the Fund, OppenheimerFunds Distributor, Inc. (the “Distributor”) acts as the Fund’s principal underwriter in the continuous public offering of the Fund’s classes of shares.

Service Plan for Class P Shares. The Fund has adopted a Service Plan (the “Plan”) for Class P shares pursuant to Rule 12b-1 under the 1940 Act. Under the Plan, the Fund reimburses the Distributor for a portion of its costs incurred for services provided to accounts that hold Class P shares. Reimbursement is made periodically at an annual rate of up to 0.25% of the average annual net assets of Class P shares of the Fund. The Distributor currently uses all of those fees to pay dealers, brokers, banks and other financial institutions periodically for providing personal service and maintenance of accounts of their customers that hold Class P shares. Any unreimbursed expenses the Distributor incurs with respect to Class P shares in any fiscal year cannot be recovered in subsequent periods. Fees incurred by the Fund under the Plan are detailed in the Statement of Operations.

Waivers and Reimbursements of Expenses. The Manager has voluntarily agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit “Expenses after waivers, payments and/or reimbursements and reduction to custodian fees” (excluding any applicable dividend expense, taxes, interest and fees from borrowing, any subsidiary expenses, Acquired Fund Fees and Expenses, brokerage commissions, unusual and infrequent expenses, and certain other Fund expenses not incurred in the ordinary course of the Fund’s business) to annual rates of 0.15% for Class E shares, 0.19% for Class L shares and 0.24% for Class P shares calculated on the daily net assets of the Fund. Effective April 3, 2017, Class E and L expense caps were removed. The 0.24% expense cap for Class P, as calculated on the daily net assets of the Fund, was retained.

26 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

7. Fees and Other Transactions with Affiliates (Continued)

The Manager has also voluntarily undertaken to waive management fees and/or reimburse expenses (but not below zero) to the extent necessary to assist the Fund in attempting to maintain a positive yield. There is no guarantee that the Fund will maintain a positive yield.

The Distributor has contractually undertaken to waive the fees payable under the Service Plan for Class P shares so that those fees are limited to 0.05% of the average annual net assets for Class P shares of the Fund. During the reporting period, the Distributor waived $10,012 for Class P shares.

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, there are no amounts eligible for recapture. 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.

8. 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 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 Received¹		Net Exposure²
Repurchase Agreements
Credit Agricole Corp. & Investment Bank		$527,615,243		$(538,167,547)		$(10,552,304)
Credit Agricole Corp. & Investment Bank		120,024,363		(122,424,850)		(2,400,487)
Credit Agricole Corp. & Investment Bank		91,040,206		(92,861,010)		(1,820,804)
Credit Agricole Corp. & Investment Bank		103,721,412		(105,795,840)		(2,074,428)
Deutsche Bank Securities, Inc.		91,002,629		(92,822,681)		(1,820,052)
Deutsche Bank Securities, Inc.		70,004,147		(71,404,230)		(1,400,083)
Deutsche Bank Securities, Inc.		110,009,808		(112,210,005)		(2,200,197)

27 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

NOTES TO FINANCIAL STATEMENTS Unaudited / Continued

8. Repurchase Agreements (Continued)


Counterparty	Repurchase Agreement Proceeds to be Received¹		Collateral Received¹		Net Exposure²
Repurchase Agreements (Continued)
Deutsche Bank Securities, Inc.		$68,006,301		$(69,366,427)		$(1,360,126)
Deutsche Bank Securities, Inc.		68,008,350		(69,368,517)		(1,360,167)
INTL FCStone Financial, Inc.		135,012,446		(139,743,311)		(4,730,865)
RBC Dominion Securities, Inc.		52,903,104		(53,961,166)		(1,058,062)
RBC Dominion Securities, Inc.		705,720,387		(719,834,795)		(14,114,408)
RBC Dominion Securities, Inc.		100,020,477		(102,020,887)		(2,000,410)
South Street Securities LLC		1,000,031,233		(1,020,112,309)		(20,081,076)
TD Securities (USA) LLC		220,006,404		(224,406,532)		(4,400,128)
TD Securities (USA) LLC		125,025,850		(127,526,367)		(2,500,517)
		$3,588,152,360

1. Includes accrued interest.

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

28 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

BOARD APPROVAL OF THE FUND’S INVESTMENT ADVISORY

AND SUB-ADVISORY AGREEMENTS Unaudited

The Fund has entered into an investment advisory agreement with OFI Global Asset Management, Inc. (“OFI Global” or the “Adviser”), a wholly-owned subsidiary of OppenheimerFunds, Inc. (“OFI” or the “Sub-Adviser”) (“OFI Global” and “OFI” together the “Managers”) and OFI Global has entered into a sub-advisory agreement with OFI whereby OFI provides investment sub-advisory services to the Fund (collectively, the “Agreements”). Each year, the Board of Trustees (the “Board”), including a majority of the independent Trustees, is required to determine whether to approve the terms of the Agreements and the renewal thereof. The Investment Company Act of 1940, as amended, requires that the Board request and evaluate, and that the Managers provide, such information as may be reasonably necessary to evaluate the terms of the Agreements. The Board employs an independent consultant to prepare a report that provides information, including comparative information that the Board requests for that purpose. In addition to in-person meetings focused on this evaluation, the Board receives information throughout the year regarding Fund services, fees, expenses and performance.

The Managers and the independent consultant provided information to the Board on the following factors: (i) the nature, quality and extent of the Managers’ services, (ii) the comparative investment performance of the Fund and the Managers, (iii) the fees and expenses of the Fund, including comparative fee and expense information, (iv) the profitability of the Managers and their affiliates, including an analysis of the cost of providing services, (v) whether economies of scale are realized as the Fund grows and whether fee levels reflect these economies of scale for Fund investors and (vi) other benefits to the Managers from their relationship with the Fund. The Board was aware that there are alternatives to retaining the Managers.

Outlined below is a summary of the principal information considered by the Board as well as the Board’s conclusions.

Nature, Quality and Extent of Services. The Board considered information about the nature, quality and extent of the services provided to the Fund and information regarding the Managers’ key personnel who provide such services. The Managers’ duties include providing the Fund with the services of the portfolio managers and the Sub-Adviser’s investment team, who provide research, analysis and other advisory services in regard to the Fund’s investments; and securities trading services. OFI Global is responsible for oversight of third-party service providers; monitoring compliance with applicable Fund policies and procedures and adherence to the Fund’s investment restrictions; risk management; and oversight of the Sub-Adviser. OFI Global is also responsible for providing certain administrative services to the Fund. Those services include providing and supervising all administrative and clerical personnel who are necessary in order to provide effective corporate administration for the Fund; compiling and maintaining records with respect to the Fund’s operations; preparing and filing reports required by the U.S. Securities and Exchange Commission; preparing periodic reports regarding the operations of the Fund for its shareholders; preparing proxy materials for shareholder meetings; and preparing the registration statements required by federal and state securities laws for the sale of the Fund’s shares. OFI Global also provides the Fund with office space, facilities and equipment.

29 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

BOARD APPROVAL OF THE FUND’S INVESTMENT ADVISORY

AND SUB-ADVISORY AGREEMENTS Unaudited / Continued

The Board also considered the quality of the services provided and the quality of the Managers’ resources that are available to the Fund. The Board took account of the fact that the Sub-Adviser has over fifty years of experience as an investment adviser and that its assets under management rank it among the top mutual fund managers in the United States. The Board evaluated the Managers’ advisory, administrative, accounting, legal, compliance and risk management services, among other services, and information the Board has received regarding the experience and professional qualifications of the Managers’ key personnel and the size and functions of its staff. In its evaluation of the quality of the portfolio management services provided, the Board considered the experience of Christopher Proctor and Adam Wilde, the portfolio managers for the Fund, and the Sub-Adviser’s investment team and analysts. The Board members also considered the totality of their experiences with the Managers as directors or trustees of the Fund and other funds advised by the Managers. The Board considered information regarding the quality of services provided by affiliates of the Managers, which the Board members have become knowledgeable about through their experiences with the Managers and in connection with the review or renewal of the Fund’s service agreements or service providers. The Board concluded, in light of the Managers’ experience, reputation, personnel, operations and resources that the Fund benefits from the services provided under the Agreements.

Investment Performance of the Managers and the Fund. Throughout the year, the Managers provided information on the investment performance of the Fund, the Adviser and the Sub-Adviser, including comparative performance information. The Board also reviewed information, prepared by the Managers and by the independent consultant, comparing the Fund’s historical performance to relevant benchmarks or market indices and to the performance of other retail funds in the money market-taxable category. The Board noted that the Fund’s one-year, three-year, five-year and ten-year performance was better than its category median.

Fees and Expenses of the Fund. The Board reviewed the fees paid to the Adviser and the other expenses borne by the Fund. The independent consultant provided comparative data in regard to the fees and expenses of the Fund and other retail front-end load money market-taxable funds with comparable asset levels and distribution features. After discussions with the Board, the Adviser has agreed to voluntarily waive fees and/or reimburse the Fund so that the total annual fund operating expenses, excluding certain expenses, as a percentage of average daily net assets will not exceed the annual rate of 0.24% for Class P shares, as calculated on the daily net assets of the Fund. The Adviser has also voluntarily undertaken to waive management fees and/or reimburse expenses to the extent necessary to assist the Fund in attempting to maintain a positive yield. These fee waivers and/or expense reimbursements may be amended at any time without prior notice to shareholders. The Board noted that the Fund’s contractual management fee and total expenses were lower than its peer group median and category median.

Economies of Scale and Profits Realized by the Managers. The Board considered information regarding the Managers’ costs in serving as the Fund’s investment adviser, sub-adviser, including the costs associated with the personnel and systems necessary to manage the Fund, and information regarding the Managers’ profitability from their relationship

30 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

with the Fund. The Board also considered that the Managers must be able to pay and retain experienced professional personnel at competitive rates to provide quality services to the Fund. The Board reviewed whether the Managers may realize economies of scale in managing and supporting the Fund and whether those economies of scale benefit the Fund’s shareholders at the current level of Fund assets in relation to its management fee.

Other Benefits to the Managers. In addition to considering the profits realized by the Managers, the Board considered information that was provided regarding the direct and indirect benefits the Managers receive as a result of their relationship with the Fund, including compensation paid to the Managers’ affiliates.

Conclusions. These factors were also considered by the independent Trustees meeting separately from the full Board, assisted by experienced counsel to the Fund and to the independent Trustees. Fund counsel and the independent Trustees’ counsel are independent of the Managers within the meaning and intent of the Securities and Exchange Commission Rules.

Based on its review of the information it received and its evaluations described above, the Board, including a majority of the independent Trustees, decided to continue the Agreements through September 30, 2018. In arriving at its decision, the Board did not identify any factor or factors as being more important than others, but considered all of the above information, and considered the terms and conditions of the Agreements, including the management fees, in light of all the surrounding circumstances.

31 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

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.

32 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND


Trustees and Officers		Brian F. Wruble, Chairman of the Board of Trustees and Trustee
		Beth Ann Brown, Trustee
		Edmund P. Giambastiani, Jr., Trustee
		Elizabeth Krentzman, Trustee
		Mary F. Miller, Trustee
		Joel W. Motley, Trustee
		Joanne Pace, Trustee
		Daniel Vandivort, Trustee
		Arthur P. Steinmetz, Trustee, President and Principal Executive Officer
		Christopher Proctor, Vice President
		Adam Wilde, Vice President
		Cynthia Lo Bessette, Secretary and Chief Legal Officer
		Jennifer Foxson, Vice President and Chief Business Officer
		Mary Ann Picciotto, Chief Compliance Officer and Chief Anti-Money
		Laundering Officer
		Brian S. Petersen, Treasurer and Principal Financial & Accounting Officer

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

		The financial statements included herein have been taken from the records of the Fund without examination of those records by the independent registered public accounting firm.

33 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

PRIVACY 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 non-public 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,^SM our electronic document delivery service.

●

Your transactions with us, our affiliates or others.

●

Technologies on our website, including: “cookies” and web beacons, which are used to collect data on the pages you visit and the features you use.

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 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 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.

34 OPPENHEIMER INSTITUTIONAL GOVERNMENT MONEY MARKET FUND

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.

●

All transactions conducted via our websites, including redemptions, exchanges and purchases, are secured by the highest encryption standards available. 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 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, safeguard that information. Strengthening your online credentials–your online security profile–typically your user name, password, and security questions and answers, can be one of your most important lines of defense on the Internet. For additional information on how you can help prevent identity theft, visit https://www. oppenheimerfunds.com/security.

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 as of November 2017. 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, email us by clicking on the Contact Us section of our website at oppenheimerfunds.com, write to us at P.O. Box 5270, Denver, CO 80217-5270, or call us at 800 CALL OPP (225 5677).

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		Oppenheimer funds are distributed by OppenheimerFunds Distributor, Inc. 225 Liberty Street, New York, NY 10281-1008 © 2018 OppenheimerFunds Distributor, Inc. All rights reserved. RS0647.001.1117 January 23, 2018

Item 2. Code of Ethics.

Not applicable to semiannual reports.

Item 3. Audit Committee Financial Expert.

Not applicable to semiannual reports.

Item 4. Principal Accountant Fees and Services.

Not applicable to semiannual reports.

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 11/30/2017, 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. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies.

Not applicable.

Item 13. Exhibits.

(a) (1) Exhibit attached hereto.

(2) Exhibits 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 Institutional Government Money Market Fund


By:		/s/ Arthur P. Steinmetz
		Arthur P. Steinmetz
		Principal Executive Officer
Date:		1/10/2018

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:		1/10/2018
By:		/s/ Brian S. Petersen
		Brian S. Petersen
		Principal Financial Officer
Date:		1/10/2018

EX-99.CERT 2 d521357dex99cert.htm SECTION 302 CERTIFICATIONS Section 302 Certifications

Exhibit 99.CERT

Section 302 Certifications

CERTIFICATIONS

I, Arthur P. Steinmetz, certify that:

1.	I have reviewed this report on Form N-CSR of Oppenheimer Institutional Government Money Market Fund;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.	The registrant’s other certifying officer and I have disclosed to the registrant’s auditors and the audit committee of the registrant’s board of Trustees (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: 1/10/2018

/s/ Arthur P. Steinmetz

Arthur P. Steinmetz

Principal Executive Officer

Exhibit 99.CERT

Section 302 Certifications

CERTIFICATIONS

I, Brian S. Petersen, certify that:

1.	I have reviewed this report on Form N-CSR of Oppenheimer Institutional Government Money Market Fund;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(a)

(b)

(c)

(d)

5.	The registrant’s other certifying officer and I have disclosed to the registrant’s auditors and the audit committee of the registrant’s board of Trustees (or persons performing the equivalent functions):

(a)

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: 1/10/2018

/s/ Brian S. Petersen

Brian S. Petersen

Principal Financial Officer

EX-99.906CERT 3 d521357dex99906cert.htm SECTION 906 CERTIFICATIONS Section 906 Certifications

EX-99.906CERT

Section 906 Certifications

CERTIFICATION PURSUANT TO 18 U.S.C SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Arthur P. Steinmetz, Principal Executive Officer, and Brian S. Petersen, Principal Financial Officer, of Oppenheimer Institutional Government Money Market Fund (the “Registrant”), each certify to the best of his knowledge that:

1.	The Registrant’s periodic report on Form N-CSR for the period ended 11/30/2017 (the “Form N-CSR”) fully complies with the requirements of Section 15(d) of the Securities Exchange Act of 1934, as amended; and

The information contained in the Form N-CSR fairly presents, in all material respects, the financial condition and results of operations of the Registrant. This certification is being furnished to the Commission solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the Form N-CSR filed with the Commission.


Principal Executive Officer						Principal Financial Officer

Oppenheimer Institutional Government Money Market Fund						Oppenheimer Institutional Government Money Market Fund

/s/ Arthur P. Steinmetz						/s/ Brian S. Petersen
Arthur P. Steinmetz						Brian S. Petersen

Date: 1/10/2018						Date: 1/10/2018

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