Supplement to the
Fidelity® Government Cash Reserves
January 29, 2024
Prospectus
The following information replaces similar information found in the “Fund Summary” section under the “Principal Investment Risks” heading.
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 a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fidelity Investments and its affiliates, the fund’s sponsor, is not required to reimburse the fund for losses, and you should not expect that the sponsor will provide financial support to the fund at any time, including during periods of market stress.
The fund will not impose a fee upon the sale of your shares.
The following information supplements information found in the “Shareholder Information” section under the “Selling Shares” heading.
• The Board of Trustees may determine that it would not be in a fund’s best interests to continue operating under circumstances listed in Rule 22e‑3 under the Investment Company Act of 1940, at which point the fund may permanently suspend redemptions and liquidate.
Effective March 1, 2024, the fund’s management contract was amended to incorporate administrative services previously covered under separate services agreements. The amended contract incorporates a basic fee rate that may vary by class (subject to an income component). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class’s management fee.
The following information replaces similar information found in the “Fund Summary” section under the “Fee Table” heading.
Annual Operating Expenses
(expenses that you pay each year as a % of the value of your investment)
 
Management fee
  0.38%A,B
Distribution and/or Service (12b‑1) fees
  None
Other expenses
  0.00%B
 
 
Total annual operating expenses
  0.38%
A The management fee covers administrative services previously provided under separate services agreements with the fund, for which 0.19% was previously charged under the services agreements.
B Adjusted to reflect current fees.

1 year
  $39
3 years
  $122
5 years
  $213
10 years
  $480
The following information replaces similar information found in the “Fund Management” section under the “Advisory Fee(s)” heading.
Each class of the fund pays a management fee to the Adviser.
The management fee is calculated and paid to the Adviser every month.
The management fee is determined by calculating a basic fee and then adding an income-related fee.
When determining a class’s basic fee, a mandate rate is calculated based on the monthly average net assets of a group of funds advised by FMR within a designated asset class. A discount rate is subtracted from the mandate rate once the fund’s monthly average net assets reach a certain level. The mandate rate and discount rate may vary by class.
The annual basic fee rate for the class of shares of the fund offered through this prospectus is the lesser of (1) the class’s mandate rate reduced by the class’s discount rate (if applicable) or (2) 0.27%. One‑twelfth of the basic fee rate for a class is applied to the average net assets of the class for the month, giving a dollar amount which is the basic fee for the class for that month.
The income-related fee varies depending on the level of the fund’s monthly gross income from an annualized rate of 0.05% (at a fund annualized gross yield of 0%) to 0.27% (at a fund annualized gross yield of 15%) of the fund’s average net assets throughout the month. The income-related fee is proportionately added to a class’s basic fee.
A different management fee rate may be applicable to each class of the fund. The difference between classes is the result of separate arrangements for class-level services and/or waivers of certain expenses. It is not the result of any difference in advisory or custodial fees or other expenses related to the management of the fund’s assets, which do not vary by class.
 
CAS-FUS-PSTK-0424-141
1.712068.141
   April 2, 2024