# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001683863-25-006200
**Filing Date:** 2025-7
**Character Count:** 10980
**Document Hash:** c3acd8922ec0a28bd3615d6ea285b3b0
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001683863-25-006200.hdr.sgml**: 20250725

**ACCESSION NUMBER**: 0001683863-25-006200

**CONFORMED SUBMISSION TYPE**: 24F-2NT

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250430

**FILED AS OF DATE**: 20250725

**DATE AS OF CHANGE**: 20250725

**EFFECTIVENESS DATE**: 20250725

**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:** 24F-2NT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-52965
- **FILM NUMBER:** 251152060

**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 Prime Institutional Fund (Series ID: S000002681)

---

|  |  |  |
|:---|:---|:---|
| Class Name                          | Ticker Symbol | Class ID   |
| UBS Select Prime Institutional Fund | SELXX         | C000007332 |

---

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

---

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

---

### UBS Liquid Assets Government Fund (Series ID: S000002684)

---

|  |  |
|:---|:---|
| Class Name                        | Class ID   |
| UBS Liquid Assets Government Fund | C000007336 |

---

### UBS Tax-Free Reserves Fund (Series ID: S000018675)

---

|  |  |  |
|:---|:---|:---|
| Class Name                 | Ticker Symbol | Class ID   |
| UBS Tax-Free Reserves Fund | STFXX         | C000051798 |

---

### UBS Select Prime Preferred Fund (Series ID: S000018676)

---

|  |  |  |
|:---|:---|:---|
| Class Name                      | Ticker Symbol | Class ID   |
| UBS Select Prime Preferred Fund | SPPXX         | C000051799 |

---

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

---

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

---

### UBS Tax-Free Preferred Fund (Series ID: S000018678)

---

|  |  |  |
|:---|:---|:---|
| Class Name                  | Ticker Symbol | Class ID   |
| UBS Tax-Free Preferred Fund | SFPXX         | C000051801 |

---

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

---

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

---

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

---

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

---

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

---

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

---

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

---

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

---

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

---

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

---

### UBS Ultra Short Income Fund (Series ID: S000061955)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class A    | USIAX         | C000200717 |
| Class P    | USIPX         | C000200718 |
| Class I    | USDIX         | C000200719 |

---

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

---

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

---

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

---

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

---

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

---

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

---

## Series and Classes Contracts Data

### UBS Select Prime Institutional Fund (Series ID: S000002681)

| Class ID   | Class Name                          | Ticker Symbol   |
|:---|:---|:---|
| C000007332 | UBS Select Prime Institutional Fund | SELXX           |

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

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

### UBS Liquid Assets Government Fund (Series ID: S000002684)

| Class ID   | Class Name                        | Ticker Symbol   |
|:---|:---|:---|
| C000007336 | UBS Liquid Assets Government Fund |  |

### UBS Tax-Free Reserves Fund (Series ID: S000018675)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000051798 | UBS Tax-Free Reserves Fund | STFXX           |

### UBS Select Prime Preferred Fund (Series ID: S000018676)

| Class ID   | Class Name                      | Ticker Symbol   |
|:---|:---|:---|
| C000051799 | UBS Select Prime Preferred Fund | SPPXX           |

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

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

### UBS Tax-Free Preferred Fund (Series ID: S000018678)

| Class ID   | Class Name                  | Ticker Symbol   |
|:---|:---|:---|
| C000051801 | UBS Tax-Free Preferred Fund | SFPXX           |

### 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           |

### UBS Ultra Short Income Fund (Series ID: S000061955)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000200717 | Class A      | USIAX           |
| C000200718 | Class P      | USIPX           |
| C000200719 | Class I      | USDIX           |

### 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           |

## FORM 24F-2NT: Annual Notice of Securities Sold Pursuant to Rule 24f-2

### 24F-2NT: Filer Information

**Filer CIK:** 1060517

**Is this a LIVE or TEST Filing?:** LIVE

**Filer Investment Company Type:** N-1A

### 24F-2NT: Annual Filing Information

**1. Name and address of issuer:**

- **Name of Issuer:** UBS Series Funds

- **Address:** 787 Seventh Avenue, New York, NY 10019

**2. The Name and EDGAR Identifier of each series or class of securities for which this Form is filed:**

- [ ] Check box if the Form is being filed for all series and classes of the issuer.

**3. Investment Company Act File Number:** 811-8767

   **Securities Act File Number:** 333-52965

**4(a). Last day of fiscal year for which this Form is filed:** 04/30/2025

**4(b). Check box if this Form is being filed late:** [ ]

**4(c). Check box if this is the last time the issuer will be filing this Form:** [ ]

**5. Calculation of registration fee:**

- **(i) Aggregate sale price of securities sold during the fiscal year:** $405793106019.00

- **(ii) Aggregate price of securities redeemed or repurchased during the fiscal year:** $402714168655.00

- **(iii) Aggregate price of securities redeemed or repurchased during any prior fiscal year:** $0.00

- **(iv) Total available redemption credits [add Items 5(ii) and 5(iii)]:** $402714168655.00

- **(v) Net sales:** $3078937364.00

- **(vi) Redemption credits available for use in future years:** $0.00

- **(vii) Multiplier for determining registration fee:** 0.0001531

- **(viii) Registration fee due:** $471385.31

**Explanatory Notes (if any):**
The registrant has one remaining series, namely Limited Purpose Cash Investment Fund; the shares of that series are privately placed and are not registered under the Securities Act of 1933, as amended; hence, that series is not included in this filing on Form 24f-2.

**Signatures**

**Name and Title:** Joanne M. Kilkeary Vice President, Treasurer and Principal Accounting Officer

**Date:** 07/25/2025

**Signature:** /s/ Joanne M. Kilkeary