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Fidelity® Money Market Central Fund

Semi-Annual Report

March 31, 2018

Contents

Investment Summary
Schedule of Investments
Financial Statements
Notes to Financial Statements
Shareholder Expense Example

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Investment Summary (Unaudited)

Effective Maturity Diversification as of March 31, 2018

Days	% of fund's investments 3/31/18
1 - 7	48.3
8 - 30	31.5
31 - 60	5.8
61 - 90	12.1
91 - 180	2.3

Effective maturity is determined in accordance with the requirements of Rule 2a-7 under the Investment Company Act of 1940.

Asset Allocation (% of fund's net assets)

As of March 31, 2018
	Certificates of Deposit	32.1%
	Commercial Paper	39.2%
	Variable Rate Demand Notes (VRDNs)	0.2%
	Non-Negotiable Time Deposit	8.7%
	Other Instruments	1.7%
	Repurchase Agreements	19.3%
	Net Other Assets (Liabilities)^*	(1.2)%

* Net Other Assets (Liabilities) are not included in the pie chart

Schedule of Investments March 31, 2018 (Unaudited)

Showing Percentage of Net Assets

Certificate of Deposit - 32.1%
	Yield(a)	Principal Amount	Value
Domestic Certificates Of Deposit - 4.4%
Citibank NA
6/13/18	2.20 %	$20,000,000	$19,999,946
Wells Fargo Bank NA
4/20/18 to 8/17/18	1.86 to 2.05 (b)(c)	82,000,000	81,989,780
			101,989,726
London Branch, Eurodollar, Foreign Banks - 2.6%
Mizuho Bank Ltd. London Branch
4/5/18 to 6/27/18	1.80 to 2.43	25,000,000	24,938,732
Sumitomo Mitsui Trust Bank Ltd. London Branch
4/4/18 to 5/29/18	1.70 to 2.10	36,000,000	36,000,110
			60,938,842
New York Branch, Yankee Dollar, Foreign Banks - 25.1%
Bank of Montreal
4/9/18 to 8/10/18	1.88 to 1.93 (b)(c)	74,000,000	73,993,654
Bank of Nova Scotia
4/10/18 to 7/13/18	1.84 to 1.95 (b)(c)	79,000,000	79,010,420
Bayerische Landesbank
5/2/18	2.20	19,000,000	19,003,640
Canadian Imperial Bank of Commerce
4/13/18 to 5/22/18	1.92 to 2.04 (b)(c)	40,000,000	40,006,220
KBC Bank NV
5/29/18 to 6/4/18	2.12 to 2.13	55,000,000	54,999,018
Landesbank Baden-Wuerttemberg New York Branch
4/2/18 to 4/5/18	1.73 to 1.73	84,000,000	83,999,951
Mitsubishi UFJ Trust & Banking Corp.
5/16/18	1.97 (b)(c)	20,000,000	20,003,900
Mizuho Corporate Bank Ltd.
6/7/18	2.19	20,000,000	20,003,378
Natixis SA
6/5/18	2.15	20,000,000	20,004,148
Royal Bank of Canada
6/20/18 to 10/18/18	1.92 to 2.41 (b)(c)	95,000,000	94,969,466
Sumitomo Mitsui Banking Corp.
5/21/18	2.03 (b)(c)	30,000,000	29,995,680
Svenska Handelsbanken AB
7/2/18 to 9/27/18	1.83 to 2.27 (b)(c)	45,000,000	44,995,122
			580,984,597
TOTAL CERTIFICATE OF DEPOSIT
(Cost $743,938,769)			743,913,165

Financial Company Commercial Paper - 29.1%
ASB Finance Ltd. (London)
7/24/18 to 9/26/18	2.04 to 2.31 (b)(c)	28,000,000	27,980,796
Barclays Bank PLC/Barclays U.S. CCP Funding LLC
4/3/18 to 6/29/18	1.87 to 2.52 (d)	44,000,000	43,868,860
Bayerische Landesbank
4/2/18 to 4/5/18	1.76 to 1.76	72,000,000	71,979,898
BNP Paribas Dublin Branch
4/2/18 to 4/4/18	1.73 to 1.73	37,000,000	36,991,957
BPCE SA
6/11/18 to 6/13/18	2.21 to 2.24	40,000,000	39,822,658
Caisse d'Amort de la Dette Sociale
4/17/18	1.75 (d)	33,000,000	32,968,756
Canadian Imperial Bank of Commerce
4/20/18 to 11/26/18	1.99 to 2.16 (b)(c)	47,000,000	46,965,231
Commonwealth Bank of Australia
7/5/18	1.86 (b)(c)	11,000,000	10,998,955
Credit Suisse AG
7/3/18 to 7/26/18	2.28 to 2.36 (b)	110,000,000	109,693,884
J.P. Morgan Securities, LLC
4/9/18 to 10/1/18	1.90 to 2.32 (b)(c)	75,000,000	75,015,770
Lam Research Corp.
4/3/18 to 4/11/18	2.30 to 2.42	2,250,000	2,248,874
Mitsubishi UFJ Trust & Banking Corp.
4/6/18 to 4/27/18	1.76 to 2.00	37,000,000	36,962,960
Rabobank Nederland New York Branch
6/4/18	2.14	30,000,000	29,889,561
Sumitomo Mitsui Banking Corp.
6/5/18 to 6/6/18	2.16 to 2.16	6,000,000	5,976,013
Sumitomo Trust & Banking Co. Ltd.
4/25/18	1.76	20,000,000	19,972,356
The Toronto-Dominion Bank
8/17/18 to 10/9/18	1.93 to 2.07 (b)(c)	61,000,000	60,959,497
UBS AG London Branch
4/3/18	1.89 (b)(c)	20,000,000	20,000,480
TOTAL FINANCIAL COMPANY COMMERCIAL PAPER
(Cost $672,383,411)			672,296,506

Asset Backed Commercial Paper - 6.2%
Atlantic Asset Securitization Corp. (Credit Agricole CIB Guaranteed)

4/2/18	1.74	5,300,000	5,298,985
6/7/18	2.16	6,000,000	5,974,952
6/8/18	2.17	4,000,000	3,982,992
Gotham Funding Corp. (Liquidity Facility Bank of Tokyo-Mitsubishi UFJ Ltd.)

4/10/18	1.76	5,000,000	4,997,090
4/26/18	1.78	3,000,000	2,995,571
4/9/18	1.77	2,000,000	1,998,940
4/9/18	1.76	2,000,000	1,998,940
6/13/18	2.26	7,000,000	6,967,105
6/26/18	2.34	51,680,000	51,377,326
6/5/18	2.19	5,000,000	4,979,808
6/7/18	2.19	2,000,000	1,991,600
Liberty Street Funding LLC (Liquidity Facility Bank of Nova Scotia)

4/16/18	1.76	2,000,000	1,998,158
4/18/18	1.76	3,000,000	2,996,905
4/18/18	1.76	3,000,000	2,996,905
4/19/18	1.76	2,000,000	1,997,825
4/9/18	1.76	4,000,000	3,997,818
Manhattan Asset Funding Co. LLC (Liquidity Facility Sumitomo Mitsui Banking Corp.)

4/11/18	1.95	4,709,000	4,705,956
4/2/18	1.80	3,000,000	2,999,433
6/11/18	2.24	7,000,000	6,967,899
6/21/18	2.35	1,000,000	994,577
Sheffield Receivables Corp. (Barclays Bank PLC Guaranteed)
4/3/18	1.98	20,433,000	20,427,906
TOTAL ASSET BACKED COMMERCIAL PAPER
(Cost $142,675,869)			142,646,691

Non-Financial Company Commercial Paper - 3.9%
Bell Canada
4/2/18	1.88 to 1.88	3,000,000	2,999,335
Dominion Resources, Inc.
4/16/18 to 5/7/18	1.91 to 2.43	5,000,000	4,988,940
Duke Energy Corp.
4/4/18 to 4/5/18	2.25 to 2.25	6,000,000	5,997,806
Eversource Energy
4/2/18 to 4/4/18	2.25 to 2.30	7,000,000	6,998,111
Rogers Communications, Inc.
5/1/18	2.38	2,000,000	1,996,164
Sempra Global
4/24/18	2.46	7,000,000	6,988,762
Tyson Foods, Inc.
4/3/18 to 4/10/18	1.87 to 2.25	17,000,000	16,993,229
UnitedHealth Group, Inc.
4/5/18	2.00	29,000,000	28,988,667
Verizon Communications, Inc.
4/2/18 to 4/25/18	2.10 to 2.37	14,000,000	13,992,491
TOTAL NON-FINANCIAL COMPANY COMMERCIAL PAPER
(Cost $89,957,031)			89,943,505

Other Instrument - 1.7%
Master Notes - 1.7%
Toyota Motor Credit Corp.
4/5/18
(Cost $39,000,000)	2.08 (b)(c)	39,000,000	39,000,000

Variable Rate Demand Note - 0.2%
New York - 0.2%
New York State Hsg. Fin. Agcy. Rev. Series 2017 A, 1.75% 4/5/18, LOC Manufacturers & Traders Trust Co., VRDN
4/5/18
(Cost $5,900,000)	1.75 (b)	5,900,000	5,900,000

Non-Negotiable Time Deposit - 8.7%
Time Deposits - 8.7%
Barclays Bank PLC
4/2/18	1.80	70,969,000	70,969,000
BNP Paribas
4/3/18 to 4/4/18	1.73 to 1.73	43,000,000	43,000,365
Credit Agricole CIB
4/2/18 to 4/4/18	1.73 to 1.73	45,000,000	45,000,066
ING Bank NV
4/3/18 to 4/4/18	1.73 to 1.73	43,000,000	43,000,067
TOTAL NON-NEGOTIABLE TIME DEPOSIT
(Cost $201,969,000)			201,969,498

U.S. Government Agency Repurchase Agreement - 1.7%
	Maturity Amount	Value
With:
Barclays Capital, Inc. at 1.81%, dated 3/29/18 due 4/5/18 (Collateralized by U.S. Government Obligations valued at $3,060,155, 3.50%, 1/1/48)	$3,001,056	$3,000,000
Citibank NA at:
1.79%, dated 3/27/18 due 4/3/18 (Collateralized by U.S. Treasury Obligations valued at $1,020,175, 1.38% - 1.75%, 3/31/20 - 6/30/22)	1,000,348	999,998
1.8%, dated 3/27/18 due 4/3/18 (Collateralized by U.S. Treasury Obligations valued at $8,161,251, 1.13% - 5.50%, 1/15/19 - 9/1/23)	8,002,800	7,999,993
Nomura Securities International, Inc. at 1.8%, dated 3/27/18 due 4/3/18 (Collateralized by U.S. Government Obligations valued at $27,544,131, 3.00% - 5.00%, 7/1/41 - 4/1/48)	27,009,450	26,999,976
TOTAL U.S. GOVERNMENT AGENCY REPURCHASE AGREEMENT
(Cost $39,000,000)		38,999,967

U.S. Treasury Repurchase Agreement - 4.8%
With:
BMO Capital Markets Corp. at 1.73%, dated 3/27/18 due 4/3/18 (Collateralized by U.S. Treasury Obligations valued at $2,040,327, 0.00% - 3.00%, 5/10/18 - 5/15/47)	2,000,673	1,999,999
BMO Harris Bank NA at 1.73%, dated 3/27/18 due 4/3/18 (Collateralized by U.S. Treasury Obligations valued at $2,040,303, 2.13%, 2/29/24)	2,000,673	1,999,999
BNP Paribas, S.A. at:
1.77%, dated 3/28/18 due 4/5/18 (Collateralized by U.S. Treasury Obligations valued at $5,150,545, 1.25% - 2.75%, 7/31/18 - 11/15/42)	5,003,196	5,000,000
1.79%, dated 3/28/18 due 4/4/18 (Collateralized by U.S. Treasury Obligations valued at $5,150,548, 1.25% - 2.75%, 7/31/18 - 11/15/42)	5,001,740	5,000,000
Commerz Markets LLC at:
1.81%, dated 3/29/18 due 4/5/18 (Collateralized by U.S. Treasury Obligations valued at $7,140,702, 2.00% - 2.25%, 12/31/23 - 6/30/24)	7,002,464	7,000,000
1.85%, dated 3/27/18 due 4/3/18 (Collateralized by U.S. Treasury Obligations valued at $3,090,554, 2.25%, 8/15/46)	3,001,079	2,999,994
1.86%, dated 3/28/18 due 4/4/18 (Collateralized by U.S. Treasury Obligations valued at $3,060,376, 1.38%, 6/30/23)	3,001,085	2,999,987
Deutsche Bank AG at 1.83%, dated 3/29/18 due 4/2/18 (Collateralized by U.S. Treasury Obligations valued at $3,090,115, 0.63% - 4.50%, 4/30/18 - 11/15/46)	3,000,610	3,000,000
Deutsche Bank Securities, Inc. at 1.8%, dated 3/27/18 due 4/3/18
(Collateralized by U.S. Treasury Obligations valued at $5,100,853, 1.88%, 12/31/19)	5,001,750	4,999,994
(Collateralized by U.S. Treasury Obligations valued at $27,544,200, 1.44%, 1/31/20)	27,009,450	26,999,965
HSBC Securities, Inc. at 1.76%, dated 3/27/18 due 4/3/18 (Collateralized by U.S. Treasury Obligations valued at $4,083,674, 1.75%, 10/31/20)	4,001,369	4,000,014
ING Financial Markets LLC at 1.8%, dated 3/29/18 due 4/2/18 (Collateralized by U.S. Treasury Obligations valued at $10,266,896, 2.00%, 2/15/25)	10,002,000	10,000,000
Nomura Securities International, Inc. at 1.8%, dated 3/28/18 due 4/4/18 (Collateralized by U.S. Treasury Obligations valued at $35,703,654, 1.38% - 2.50%, 8/31/20 - 2/15/46)	35,012,250	34,999,864
TOTAL U.S. TREASURY REPURCHASE AGREEMENT
(Cost $111,000,000)		110,999,816

Other Repurchase Agreement - 12.8%
Other Repurchase Agreement - 12.8%
With:
BNP Paribas at 1.81%, dated 3/29/18 due 4/2/18 (Collateralized by Corporate Obligations valued at $10,500,528, 2.90% - 7.25%, 3/15/21 - 3/1/48)	10,002,011	10,000,000
Citigroup Global Markets, Inc. at:
1.88%, dated 3/29/18 due 4/2/18 (Collateralized by Equity Securities valued at $7,560,533)	7,001,462	7,000,000
2.36%, dated:
2/28/18 due 4/30/18 (Collateralized by Equity Securities valued at $23,802,787)(b)(c)(e)	22,087,976	21,999,558
3/8/18 due 5/7/18 (Collateralized by Equity Securities valued at $20,547,404)(b)(c)(e)	19,074,733	18,998,875
2.71%, dated 2/20/18 due 5/21/18 (Collateralized by Mortgage Loan Obligations valued at $9,747,805, 3.99% - 4.99%, 7/15/30 - 1/18/46)	9,060,975	8,999,096
2.77%, dated 2/23/18 due 5/21/18 (Collateralized by Mortgage Loan Obligations valued at $3,248,726, 4.67% - 4.93%, 1/12/34 - 7/17/34)	3,020,083	2,999,852
Deutsche Bank AG at 1.93%, dated 3/29/18 due 4/2/18 (Collateralized by Municipal Bond Obligations valued at $11,580,754, 0.00% - 4.00%, 3/1/25 - 12/15/56)	11,002,359	11,000,000
HSBC Securities, Inc. at 1.88%, dated 3/29/18 due 4/2/18 (Collateralized by Corporate Obligations valued at $5,251,325, 4.30%, 12/15/47)	5,001,044	5,000,000
ING Financial Markets LLC at:
1.88%, dated 3/29/18 due 4/2/18 (Collateralized by Equity Securities valued at $9,720,597)	9,001,880	9,000,000
1.96%, dated 3/29/18 due 4/2/18 (Collateralized by Corporate Obligations valued at $4,321,061, 4.75% - 10.00%, 5/15/19 - 6/1/36)	4,000,871	4,000,000
J.P. Morgan Securities, LLC at 1.88%, dated 3/28/18 due 4/4/18 (Collateralized by U.S. Government Obligations valued at $17,511,008, 3.63% - 4.63%, 11/25/37 - 3/25/47)	17,006,214	17,000,129
Merrill Lynch, Pierce, Fenner & Smith at:
1.88%, dated 3/28/18 due 4/4/18 (Collateralized by U.S. Government Obligations valued at $17,341,811, 2.50%, 5/1/30)	17,006,214	17,000,481
1.95%, dated 3/28/18 due 4/5/18 (Collateralized by Equity Securities valued at $5,400,586)	5,003,792	5,000,000
Mitsubishi UFJ Securities (U.S.A.), Inc. at 1.87%, dated 3/29/18 due 4/2/18 (Collateralized by Equity Securities valued at $10,800,567)	10,002,078	10,000,000
Mizuho Securities U.S.A., Inc. at:
1.86%, dated 3/29/18 due 4/2/18 (Collateralized by U.S. Treasury Obligations valued at $5,100,357, 3.63% - 3.75%, 11/15/18 - 8/15/19)	5,001,033	5,000,000
1.93%, dated:
3/21/18 due 4/4/18 (Collateralized by Equity Securities valued at $3,241,634)	3,002,252	3,000,000
3/28/18 due 4/5/18 (Collateralized by Equity Securities valued at $5,400,646)	5,003,753	5,000,000
3/29/18 due 4/5/18 (Collateralized by Equity Securities valued at $5,400,350)	5,003,753	5,000,000
2.03%, dated 3/23/18 due 4/5/18 (Collateralized by U.S. Treasury Obligations valued at $1,020,425, 3.13%, 5/15/21)	1,000,789	1,000,000
2.99%, dated 3/14/18 due 6/12/18 (Collateralized by Corporate Obligations valued at $3,244,306, 12.00%, 6/16/20)	3,022,425	3,000,317
RBS Securities, Inc. at 1.85%, dated 3/29/18 due 4/2/18 (Collateralized by U.S. Government Obligations valued at $34,680,139, 2.13%, 3/13/20)	34,006,989	34,000,000
Societe Generale at:
1.81%, dated 3/29/18 due 4/2/18 (Collateralized by Corporate Obligations valued at $70,353,538, 0.00% - 9.00%, 5/15/18 - 1/24/77)	67,013,474	67,000,000
1.96%, dated 3/29/18 due 4/2/18 (Collateralized by Corporate Obligations valued at $22,681,748, 3.85% - 10.75%, 10/15/19 - 10/15/39)	21,004,573	21,000,000
Wells Fargo Securities, LLC at 1.88%, dated 3/29/18 due 4/2/18 (Collateralized by Corporate Obligations valued at $4,320,227, 3.38%, 8/15/26)	4,000,836	4,000,000
TOTAL OTHER REPURCHASE AGREEMENT
(Cost $296,000,000)		295,998,308
TOTAL INVESTMENT IN SECURITIES - 101.2%
(Cost $2,341,824,080)		2,341,667,456
NET OTHER ASSETS (LIABILITIES) - (1.2)%		(28,380,918)
NET ASSETS - 100%		$2,313,286,538

Security Type Abbreviations

VRDN – VARIABLE RATE DEMAND NOTE (A debt instrument that is payable upon demand, either daily, weekly or monthly)

The date shown for securities represents the date when principal payments must be paid, taking into account any call options exercised by the issuer and any permissible maturity shortening features other than interest rate resets.

Legend

(a) Yield represents either the annualized yield at the date of purchase, or the stated coupon rate, or, for floating and adjustable rate securities, the rate at period end.

(b) Coupon rates for floating and adjustable rate securities reflect the rates in effect at period end.

(c) Coupon is indexed to a floating interest rate which may be multiplied by a specified factor and/or subject to caps or floors.

(d) Security exempt from registration under Rule 144A of the Securities Act of 1933. These securities may be resold in transactions exempt from registration, normally to qualified institutional buyers. At the end of the period, the value of these securities amounted to $76,837,616 or 3.3% of net assets.

(e) The maturity amount is based on the rate at period end.

Investment Valuation

All investments are categorized as Level 2 under the Fair Value Hierarchy. The inputs or methodology used for valuing securities may not be an indication of the risk associated with investing in those securities. For more information on valuation inputs please refer to the Investment Valuation section in the accompanying Notes to Financial Statements.

See accompanying notes which are an integral part of the financial statements.

Financial Statements

Statement of Assets and Liabilities

		March 31, 2018 (Unaudited)
Assets
Investment in securities, at value (including repurchase agreements of $445,998,091) — See accompanying schedule: Unaffiliated issuers (cost $2,341,824,080)		$2,341,667,456
Cash		29,943
Receivable for investments sold		29,956,983
Receivable for fund shares sold		137,011
Interest receivable		1,219,576
Total assets		2,373,010,969
Liabilities
Payable for investments purchased	$56,665,860
Payable for fund shares redeemed	3,043,664
Other payables and accrued expenses	14,907
Total liabilities		59,724,431
Net Assets		$2,313,286,538
Net Assets consist of:
Paid in capital		$2,313,415,492
Undistributed net investment income		1,311
Accumulated undistributed net realized gain (loss) on investments		26,359
Net unrealized appreciation (depreciation) on investments		(156,624)
Net Assets, for 2,313,371,960 shares outstanding		$2,313,286,538
Net Asset Value, offering price and redemption price per share ($2,313,286,538 ÷ 2,313,371,960 shares)		$1.0000

See accompanying notes which are an integral part of the financial statements.

Statement of Operations

		Six months ended March 31, 2018 (Unaudited)
Investment Income
Interest (including $43,209 from affiliated interfund lending)		$16,302,865
Expenses
Custodian fees and expenses	$29,490
Independent trustees' fees and expenses	3,858
Total expenses before reductions	33,348
Expense reductions	(122)	33,226
Net investment income (loss)		16,269,639
Realized and Unrealized Gain (Loss)
Net realized gain (loss) on:
Investment securities:
Unaffiliated issuers		(37,799)
Total net realized gain (loss)		(37,799)
Change in net unrealized appreciation (depreciation) on investment securities		(304,518)
Net increase in net assets resulting from operations		$15,927,322

See accompanying notes which are an integral part of the financial statements.

Statement of Changes in Net Assets

	Six months ended March 31, 2018 (Unaudited)	Year ended September 30, 2017
Increase (Decrease) in Net Assets
Operations
Net investment income (loss)	$16,269,639	$22,687,821
Net realized gain (loss)	(37,799)	56,423
Change in net unrealized appreciation (depreciation)	(304,518)	(180,942)
Net increase in net assets resulting from operations	15,927,322	22,563,302
Distributions to shareholders from net investment income	(16,268,328)	(22,687,664)
Affiliated share transactions
Proceeds from sales of shares	509,246,051	338,110,001
Reinvestment of distributions	16,268,328	22,687,664
Cost of shares redeemed	(391,841,256)	(1,509,000)
Net increase (decrease) in net assets and shares resulting from share transactions	133,673,123	359,288,665
Total increase (decrease) in net assets	133,332,117	359,164,303
Net Assets
Beginning of period	2,179,954,421	1,820,790,118
End of period	$2,313,286,538	$2,179,954,421
Other Information
Undistributed net investment income end of period	$1,311	$–
Shares
Sold	509,235,608	338,067,924
Issued in reinvestment of distributions	16,266,774	22,683,810
Redeemed	(391,802,457)	(1,508,698)
Net increase (decrease)	133,699,925	359,243,036

See accompanying notes which are an integral part of the financial statements.

Financial Highlights

Fidelity Money Market Central Fund

	Six months ended (Unaudited) March 31,	Years endedSeptember 30,
	2018	2017	2016^A	2015	2014	2013
Selected Per–Share Data
Net asset value, beginning of period	$1.0001	$1.0002	$1.0000	$1.00	$1.00	$1.00
Income from Investment Operations
Net investment income (loss)	.0079	.0117	.0062	.003	.002	.003
Net realized and unrealized gain (loss)	(.0001)	(.0001)	.0003	–^B	–^B	–^B
Total from investment operations	.0078	.0116	.0065	.003	.002	.003
Distributions from net investment income	(.0079)	(.0117)	(.0062)	(.003)	(.002)	(.003)
Distributions from net realized gain	–	–	(.0001)	–	–	–
Total distributions	(.0079)	(.0117)	(.0063)	(.003)	(.002)	(.003)
Net asset value, end of period	$1.0000	$1.0001	$1.0002	$1.00	$1.00	$1.00
Total Return^C,^D	.79%	1.16%	.66%	.29%	.25%	.30%
Ratios to Average Net Assets^E
Expenses before reductions^F	- %^G	-%	-%	-%	-%	-%
Expenses net of fee waivers, if any^F	- %^G	-%	-%	-%	-%	-%
Expenses net of all reductions^F	- %^G	-%	-%	-%	-%	-%
Net investment income (loss)	1.59%^G	1.18%	.64%	.29%	.25%	.30%
Supplemental Data
Net assets, end of period (000 omitted)	$2,313,479	$2,179,954	$1,820,790	$1,225,937	$833,857	$831,790

^A Beginning September 12, 2016 the Fund began selling and redeeming class shares based upon the market-based value of the securities held rounded to the fourth decimal place; a "floating" net asset value.

^B Amount represents less than $.0005 per share.

^C Total returns for periods of less than one year are not annualized.

^D Total returns would have been lower if certain expenses had not been reduced during the applicable periods shown.

^E Expense ratios reflect operating expenses of the Fund. Expenses before reductions do not reflect amounts reimbursed or waived or reductions from expense offset arrangements and do not represent the amount paid by the Fund during periods when reimbursements, waivers or reductions occur. Expenses net of fee waivers reflect expenses after reimbursement and waivers but prior to reductions from expense offset arrangements. Expenses net of all reductions represent the net expenses paid by the Fund.

^F Amount represents less than .005%.

^G Annualized

See accompanying notes which are an integral part of the financial statements.

Notes to Financial Statements (Unaudited)

For the period ended March 31, 2018

1. Organization.

Fidelity Money Market Central Fund (the Fund) is a fund of Fidelity Garrison Street Trust (the Trust) and is authorized to issue an unlimited number of shares. The Trust is registered under the Investment Company Act of 1940, as amended (the 1940 Act), as an open-end management investment company organized as a Massachusetts business trust. Shares of the Fund are only offered to other investment companies and accounts (the Investing Funds) managed by Fidelity Management & Research Company (FMR), or its affiliates. The Fund has been designated an institutional money market fund, and the value of the Fund's shares are calculated to four decimal places that fluctuates based upon changes in the value of the Fund's investments.

2. Significant Accounting Policies.

The Fund is an investment company and applies the accounting and reporting guidance of the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946 Financial Services – Investments Companies. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP), which require management to make certain estimates and assumptions at the date of the financial statements. Actual results could differ from those estimates. Subsequent events, if any, through the date that the financial statements were issued have been evaluated in the preparation of the financial statements. The following summarizes the significant accounting policies of the Fund:

Investment Valuation. Investments are valued as of 4:00 p.m. Eastern time on the last calendar day of the period. The Board of Trustees (the Board) has delegated the day to day responsibility for the valuation of the Fund's investments to the Fair Value Committee (the Committee) established by the Fund's investment adviser. In accordance with valuation policies and procedures approved by the Board, the Fund attempts to obtain prices from one or more third party pricing vendors or brokers to value its investments. When current market prices, quotations or currency exchange rates are not readily available or reliable, investments will be fair valued in good faith by the Committee, in accordance with procedures adopted by the Board. Factors used in determining fair value vary by investment type and may include market or investment specific events, changes in interest rates and credit quality. The frequency with which these procedures are used cannot be predicted and they may be utilized to a significant extent. The Committee oversees the Fund's valuation policies and procedures and reports to the Board on the Committee's activities and fair value determinations. The Board monitors the appropriateness of the procedures used in valuing the Fund's investments and ratifies the fair value determinations of the Committee.

The Fund categorizes the inputs to valuation techniques used to value its investments into a disclosure hierarchy consisting of three levels as shown below:

Level 1 – quoted prices in active markets for identical investments

Level 2 – other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, etc.)

Level 3 – unobservable inputs (including the Fund's own assumptions based on the best information available)

Valuation techniques used to value the Fund's investments by major category are as follows:

Debt securities, including restricted securities, are valued based on evaluated prices received from third party pricing vendors or from brokers who make markets in such securities. Commercial paper, certificates of deposit, master notes and other short-term securities are valued by pricing vendors who utilize matrix pricing which considers yield or price of bonds of comparable quality, coupon, maturity and type or by broker-supplied prices. When independent prices are unavailable or unreliable, debt securities may be valued utilizing pricing methodologies which consider similar factors that would be used by third party pricing vendors. Debt securities are generally categorized as Level 2 in the hierarchy but may be Level 3 depending on the circumstances.

Short-term securities with remaining maturities of sixty days or less may be valued at amortized cost, which approximates fair value, and are categorized as Level 2 in the hierarchy.

Securities held by a money market fund are generally high quality and liquid; however, they are reflected as Level 2 because the inputs used to determine fair value are not quoted prices in an active market.

Investment Transactions and Income. Security transactions are accounted for as of trade date. Gains and losses on securities sold are determined on the basis of identified cost. Interest income is accrued as earned and includes coupon interest and amortization of premium and accretion of discount on debt securities as applicable.

Expenses. Expenses directly attributable to a fund are charged to that fund. Expenses attributable to more than one fund are allocated among the respective funds on the basis of relative net assets or other appropriate methods. Expense estimates are accrued in the period to which they relate and adjustments are made when actual amounts are known.

Income Tax Information and Distributions to Shareholders. Each year, the Fund intends to qualify as a regulated investment company under Subchapter M of the Internal Revenue Code, including distributing substantially all of its taxable income and realized gains. As a result, no provision for U.S. Federal income taxes is required. The Fund files a U.S. federal tax return, in addition to state and local tax returns as required. The Fund's federal income tax returns are subject to examination by the Internal Revenue Service (IRS) for a period of three fiscal years after they are filed. State and local tax returns may be subject to examination for an additional fiscal year depending on the jurisdiction.

Distributions are declared and recorded daily and paid monthly from net investment income. Distributions from realized gains, if any, are declared and recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from GAAP.

Capital accounts within the financial statements are adjusted for permanent book-tax differences. These adjustments have no impact on net assets or the results of operations. Capital accounts are not adjusted for temporary book-tax differences which will reverse in a subsequent period.

As of period end, the cost and unrealized appreciation (depreciation) in securities for federal income tax purposes were as follows:

Gross unrealized appreciation	$99,392
Gross unrealized depreciation	(256,016)
Net unrealized appreciation (depreciation)	$(156,624)
Tax cost	$2,341,824,080

Repurchase Agreements. Pursuant to an Exemptive Order issued by the Securities and Exchange Commission (the SEC), the Fund along with other registered investment companies having management contracts with FMR, or other affiliated entities of FMR, are permitted to transfer uninvested cash balances into joint trading accounts which are then invested in repurchase agreements. The Fund may also invest directly with institutions in repurchase agreements. Repurchase agreements may be collateralized by government or non-government securities. Upon settlement date, collateral is held in segregated accounts with custodian banks and may be obtained in the event of a default of the counterparty. The Fund monitors, on a daily basis, the value of the collateral to ensure it is at least equal to the principal amount of the repurchase agreement (including accrued interest). In the event of a default by the counterparty, realization of the collateral proceeds could be delayed, during which time the value of the collateral may decline.

Restricted Securities. The Fund may invest in securities that are subject to legal or contractual restrictions on resale. These securities generally may be resold in transactions exempt from registration or to the public if the securities are registered. Disposal of these securities may involve time-consuming negotiations and expense, and prompt sale at an acceptable price may be difficult. Information regarding restricted securities is included at the end of the Fund's Schedule of Investments.

3. Fees and Other Transactions with Affiliates.

Management Fee and Expense Contract. Fidelity Investments Money Management, Inc. (the investment adviser), an affiliate of FMR, provides the Fund with investment management services. The Fund does not pay any fees for these services. Pursuant to the Fund's management contract with the investment adviser, FMR pays the investment adviser a portion of the management fees it receives from the Investing Funds. In addition, under an expense contract, FMR also pays all other expenses of the Fund, excluding custody fees, the compensation of the independent Trustees, and certain miscellaneous expenses such as proxy and shareholder meeting expenses.

Interfund Lending Program. Pursuant to an Exemptive Order issued by the SEC, the Fund, along with other registered investment companies having management contracts with FMR or other affiliated entities of FMR, may participate in an interfund lending program. This program provides an alternative credit facility allowing the funds to borrow from, or lend money to, other participating affiliated funds. At period end, there were no interfund loans outstanding. The Fund's activity in this program during the period for which loans were outstanding was as follows:

	Average Loan Balance	Weighted Average Interest Rate
Lender	$15,010,691	1.52%

Interfund Trades. The Fund may purchase from or sell securities to other Fidelity Funds under procedures adopted by the Board. The procedures have been designed to ensure these interfund trades are executed in accordance with Rule 17a-7 of the 1940 Act.

4. Expense Reductions.

FMR has voluntarily agreed to reimburse a portion of the Fund's operating expenses. For the period, the reimbursement reduced the expenses by $28.

In addition, through arrangements with the Fund's custodian, credits realized as a result of certain uninvested cash balances were used to reduce the Fund's expenses. During the period, these credits reduced the Fund's custody expenses by $94.

5. Other.

The Fund's organizational documents provide former and current 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.

At the end of the period, mutual funds managed by FMR or its affiliates were the owners of record of all of the outstanding shares of the Fund.

Shareholder Expense Example

As a shareholder of a Fund, you incur two types of costs: (1) transaction costs and (2) ongoing costs, including other Fund expenses. This Example is intended to help you understand your ongoing costs (in dollars) of investing in the Funds and to compare these costs with the ongoing costs of investing in other mutual funds.

The Example is based on an investment of $1,000 invested at the beginning of the period and held for the entire period (October 1, 2017 to March 31, 2018).

Actual Expenses

The first line of the accompanying table provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000.00 (for example, an $8,600 account value divided by $1,000.00 = 8.6), then multiply the result by the number in the first line under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period.

Hypothetical Example for Comparison Purposes

The second line of the accompanying table provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year 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 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 transaction costs. Therefore, the second line of the table is useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds.

	Annualized Expense Ratio-^A	Beginning Account Value October 1, 2017	Ending Account Value March 31, 2018	Expenses Paid During Period-^B October 1, 2017 to March 31, 2018
Actual	.0033%	$1,000.00	$1,007.90	$.02
Hypothetical-^C		$1,000.00	$1,024.92	$.02

^A Annualized expense ratio reflects expenses net of applicable fee waivers.

^B Expenses are equal to the Fund's annualized expense ratio, multiplied by the average account value over the period, multiplied by 182/365 (to reflect the one-half year period).

^C 5% return per year before expenses

Fidelity Investments

Corporate Headquarters

245 Summer St.

Boston, MA 02210

www.fidelity.com

CFM-SANN-0518
1.756671.117

Exhibit EX-99.CERT

I, Stephanie J. Dorsey, certify that:

I have reviewed this report on Form N-CSR of Fidelity Garrison Street Trust;

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(s) 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:

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;

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;

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 upon such evaluation; and

Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during 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

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

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

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:

May 24, 2018

/s/Stephanie J. Dorsey

Stephanie J. Dorsey

President and Treasurer

I, Howard J. Galligan III, certify that:

I have reviewed this report on Form N-CSR of Fidelity Garrison Street Trust;

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:

May 24, 2018

/s/Howard J. Galligan III

Howard J. Galligan III

Chief Financial Officer


Date of fiscal year end:	September 30

Date of reporting period:	March 31, 2018


(a)	(1)	Not applicable.
(a)	(2)	Certification pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)) is filed and attached hereto as Exhibit 99.CERT.
(a)	(3)	Not applicable.
(b)		Certification pursuant to Rule 30a-2(b) under the Investment Company Act of 1940 (17 CFR 270.30a-2(b)) is furnished and attached hereto as Exhibit 99.906CERT.