# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001193125-25-194142
**Filing Date:** 2025-9
**Character Count:** 5447
**Document Hash:** 5932e229fc125709cc7c4212210033a5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-194142.hdr.sgml**: 20250902

**ACCESSION NUMBER**: 0001193125-25-194142

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250902

**DATE AS OF CHANGE**: 20250902

**EFFECTIVENESS DATE**: 20250902

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** UBS Series Funds
- **CENTRAL INDEX KEY:** 0001060517

**ORGANIZATION NAME:**
- **EIN:** 134010447
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-52965
- **FILM NUMBER:** 251286639

**BUSINESS ADDRESS:**
- **STREET 1:** C/O UBS ASSET MANAGEMENT (AMERICAS) LLC
- **STREET 2:** 787 SEVENTH AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
- **BUSINESS PHONE:** 212-821-3000

**MAIL ADDRESS:**
- **STREET 1:** C/O UBS ASSET MANAGEMENT (AMERICAS) LLC
- **STREET 2:** 787 SEVENTH AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** UBS MONEY SERIES
- **DATE OF NAME CHANGE:** 20020716

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BRINSON MONEY SERIES
- **DATE OF NAME CHANGE:** 20010625

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MITCHELL HUTCHINS LIR MONEY SERIES
- **DATE OF NAME CHANGE:** 19990730

## Series and Classes Contracts Data

### UBS Select Treasury Institutional Fund (Series ID: S000002682)

| Class ID   | Class Name                             | Ticker Symbol   |
|:---|:---|:---|
| C000007334 | UBS Select Treasury Institutional Fund | SETXX           |

### UBS Select Treasury Preferred Fund (Series ID: S000018677)

| Class ID   | Class Name                         | Ticker Symbol   |
|:---|:---|:---|
| C000051800 | UBS Select Treasury Preferred Fund | STPXX           |

### UBS Prime Reserves Fund (Series ID: S000052306)

| Class ID   | Class Name              | Ticker Symbol   |
|:---|:---|:---|
| C000164452 | UBS Prime Reserves Fund | UPRXX           |

### UBS Prime Preferred Fund (Series ID: S000052307)

| Class ID   | Class Name               | Ticker Symbol   |
|:---|:---|:---|
| C000164453 | UBS Prime Preferred Fund | UPPXX           |

### UBS Select Government Institutional Fund (Series ID: S000053131)

| Class ID   | Class Name                               | Ticker Symbol   |
|:---|:---|:---|
| C000167199 | UBS Select Government Institutional Fund | SEGXX           |

### UBS Select Government Preferred Fund (Series ID: S000053132)

| Class ID   | Class Name                           | Ticker Symbol   |
|:---|:---|:---|
| C000167200 | UBS Select Government Preferred Fund | SGPXX           |

### UBS RMA Government Money Market Fund (Series ID: S000053134)

| Class ID   | Class Name                           | Ticker Symbol   |
|:---|:---|:---|
| C000167202 | UBS RMA Government Money Market Fund | RMGXX           |

### Cantor Fitzgerald Government Money Market Fund (Series ID: S000083382)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000246985 | Investor Shares      | CFGXX           |
| C000248938 | Institutional Shares | CFYXX           |

### UBS Select 100% US Treasury Institutional Fund (Series ID: S000084282)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000248579 | UBS Select 100% US Treasury Institutional Fund | SIOXX           |

### UBS Select 100% US Treasury Preferred Fund (Series ID: S000084283)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000248580 | Class P      | STAXX           |
| C000250059 | Class T      | SOPXX           |

---

| | |
|:---|:---|
| ![LOGO](g45332g0830093246913.jpg)  | **Dechert LLP**<br> 1900 K Street, N.W.<br> Washington, DC 20006-1110<br> +1 202 261 3300 Main<br> +1 202 261 3333 Fax<br>|
| ![LOGO](g45332g0830093246913.jpg)  | <br> **Stephen Cohen**<br> ***PARTNER***<br>**STEPHEN.COHEN@DECHERT.COM**<br> **+1 202 261 3304 DIRECT**<br> **+1 202 261 3024 FAX** |

---

September 2, 2025

**VIA EDGAR** 

Filing Desk

Securities and Exchange Commission

Office of Filings and Information Services

Branch of Registrations and Examinations

Mail Stop 0-25

100 F Street, NE

Washington, DC 20549

Re: UBS Series Funds (the "Registrant")

File Nos. 333-52965 and 811-08767

Post-Effective Amendment No. 80 to the Registration Statement on Form N-1A (the "Amendment")

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended (the "Act"), the undersigned hereby certifies, on behalf of the Registrant, (i) that the form of the Registrant's Prospectuses for UBS Select Government Preferred Fund, UBS Select Government Institutional Fund, UBS Select Treasury Preferred Fund, UBS Select Treasury Institutional Fund, UBS Select 100% US Treasury Preferred Fund, UBS Select 100% US Treasury Institutional Fund, UBS Prime Reserves Fund, UBS Prime Preferred Fund, Cantor Fitzgerald Government Money Market Fund, and UBS RMA Government Money Market Fund that would have been filed by the Registrant pursuant to Rule 497(c) under the Act would not have differed from that contained in the Amendment; and (ii) that the text of the Amendment was filed electronically via EDGAR with the Commission on August 26, 2025.

If you have any questions or comments, please contact the undersigned at 202.261.3304.

Very truly yours,

<u>/s/ Stephen T. Cohen</u> 

Stephen T. Cohen