# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-26-000471
**Filing Date:** 2026-1
**Character Count:** 13913
**Document Hash:** e62e237188d6a9c5b8b98c2a9dfe0376
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-000471.hdr.sgml**: 20260108

**ACCESSION NUMBER**: 0001410368-26-000471

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260108

**DATE AS OF CHANGE**: 20260108

**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:** N-MFP3
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-08767
- **FILM NUMBER:** 26520432

**BUSINESS ADDRESS:**
- **STREET 1:** C/O UBS ASSET MANAGEMENT (AMERICAS) LLC
- **STREET 2:** 1285 AVENUE OF THE AMERICAS
- **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:** 1285 AVENUE OF THE AMERICAS
- **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 RMA Government Money Market Fund (Series ID: S000053134)

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

# Form N-MFP3: Monthly Schedule of Portfolio Holdings

## N-MFP: Filer Information
**Submission Type:** N-MFP3
**CIK:** 0001060517

### General Information

**Report for (YYYY-MM-DD):** 2025-12-31

**Registrant Full Name:** UBS Series Funds

**CIK Number of Registrant:** 0001060517

**LEI of Registrant:** 54930058UKPXVB81RJ71

**Name of Series:** UBS RMA Government Money Market Fund

**LEI of Series:** 549300WUNTYEEH9XHV55

**EDGAR Series Identifier:** S000053134

**Total number of share classes in the series:** 1

**Is this the fund's final filing on Form N-MFP?:** No

**Has the fund acquired or merged with another fund?:** No

## Part A: Series-Level Information about the Fund

### Service Providers
| Role                          | Details                                                      | File/CIK Number   |
|:---|:---|:---|
| Investment Adviser            | UBS ASSET MANAGEMENT (AMERICAS) LLC                          | 801-34910         |
| Independent Public Accountant | Ernst & Young  LLP<br>City: New York<br>State: NY            |  |
| Administrator                 | UBS ASSET MANAGEMENT (AMERICAS) LLC                          |  |
| Transfer Agent                | BNY Mellon Investment Servicing (US) Inc.<br>CIK: 0000849542 | 084-01761         |

### Fund Characteristics & Assets

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

- **Is this a Feeder Fund?:** Yes

- **Is this a Master Fund?:** No

- **Is this series for insurance company separate accounts?:** No

- **Money Market Fund Category:** Government

- **Is this a Retail Money Market Fund?:** No

- **Is this a Government Money Market Fund?:** No

- **WAM:** 1 days

- **WAL:** 1 days

- **Total Value of Portfolio Securities:** $1168809618.36

- **Amortized Cost of Portfolio Securities:** $0.00

- **Cash:** $0.00

- **Total Other Assets:** $98746.37

- **Total Liabilities:** $3661858.45

- **Net Assets of Series:** $1165246506.28

- **Number of Shares Outstanding (Series):** 1165283257.6400

- **Does the fund seek to maintain a stable price per share?:** Yes

- **Stable Price Per Share:** $1.00

- **Is cash management vehicle an affiliated fund?:** No

- **Does the fund apply liquidity fees?:** No

### Daily & Weekly Liquid Assets
| Date       | Daily Liquid Assets ($)   | Weekly Liquid Assets ($)   | Daily Liquid Assets (%)   | Weekly Liquid Assets (%)   |
|:---|:---|:---|:---|:---|
| 2025-12-01 | $20219258363.32           | $22285943497.89            | 75.2100%                  | 82.9000%                   |
| 2025-12-02 | $20417285346.90           | $22484158130.38            | 74.8400%                  | 82.4200%                   |
| 2025-12-03 | $20368672977.15           | $22435664667.57            | 74.0500%                  | 81.5700%                   |
| 2025-12-04 | $20159758404.28           | $22100993704.96            | 74.0000%                  | 81.1300%                   |
| 2025-12-05 | $20293310296.63           | $22234762834.01            | 73.7600%                  | 80.8100%                   |
| 2025-12-08 | $20835908833.89           | $22777991885.30            | 74.2600%                  | 81.1900%                   |
| 2025-12-09 | $19754250513.04           | $21696392668.07            | 73.2300%                  | 80.4300%                   |
| 2025-12-10 | $19428399716.23           | $21370977658.28            | 72.9000%                  | 80.1900%                   |
| 2025-12-11 | $19100590946.98           | $21043336404.90            | 72.0300%                  | 79.3600%                   |
| 2025-12-12 | $19305882988.19           | $21248774360.58            | 72.2300%                  | 79.5000%                   |
| 2025-12-15 | $19524624589.69           | $21591176714.81            | 72.4600%                  | 80.1200%                   |
| 2025-12-16 | $19249587846.07           | $21316255505.32            | 72.1700%                  | 79.9200%                   |
| 2025-12-17 | $19524593412.47           | $21591616856.64            | 72.4500%                  | 80.1200%                   |
| 2025-12-18 | $19198447741.03           | $21012520863.67            | 72.6800%                  | 79.5500%                   |
| 2025-12-19 | $19925475778.75           | $21739735422.48            | 73.4000%                  | 80.0800%                   |
| 2025-12-22 | $20171367489.14           | $22240602437.49            | 73.6400%                  | 81.2000%                   |
| 2025-12-23 | $19918501391.34           | $21987877154.27            | 73.3900%                  | 81.0200%                   |
| 2025-12-24 | $19243018139.96           | $21186633527.34            | 73.0500%                  | 80.4300%                   |
| 2025-12-26 | $19214562837.61           | $21405098779.72            | 73.0100%                  | 81.3400%                   |
| 2025-12-29 | $19571119750.96           | $21762274212.22            | 73.3800%                  | 81.5900%                   |
| 2025-12-30 | $20278219442.46           | $22469600358.98            | 74.0600%                  | 82.0700%                   |
| 2025-12-31 | $20560111581.86           | $22376753676.02            | 75.3400%                  | 82.0000%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-12-01 | 4.0500%             |
| 2025-12-02 | 4.0500%             |
| 2025-12-03 | 4.0400%             |
| 2025-12-04 | 4.0300%             |
| 2025-12-05 | 4.0000%             |
| 2025-12-08 | 3.9900%             |
| 2025-12-09 | 3.9800%             |
| 2025-12-10 | 3.9700%             |
| 2025-12-11 | 3.9600%             |
| 2025-12-12 | 3.9100%             |
| 2025-12-15 | 3.8900%             |
| 2025-12-16 | 3.8800%             |
| 2025-12-17 | 3.8600%             |
| 2025-12-18 | 3.8500%             |
| 2025-12-19 | 3.8400%             |
| 2025-12-22 | 3.8400%             |
| 2025-12-23 | 3.8300%             |
| 2025-12-24 | 3.8300%             |
| 2025-12-26 | 3.8400%             |
| 2025-12-29 | 3.8400%             |
| 2025-12-30 | 3.8400%             |
| 2025-12-31 | 3.8500%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-12-01 | 1.0001                      |
|  |  |
| 2025-12-02 | 1.0002                      |
|  |  |
| 2025-12-03 | 1.0002                      |
|  |  |
| 2025-12-04 | 1.0002                      |
|  |  |
| 2025-12-05 | 1.0002                      |
|  |  |
| 2025-12-08 | 1.0002                      |
|  |  |
| 2025-12-09 | 1.0002                      |
|  |  |
| 2025-12-10 | 1.0002                      |
|  |  |
| 2025-12-11 | 1.0002                      |
|  |  |
| 2025-12-12 | 1.0002                      |
|  |  |
| 2025-12-15 | 1.0002                      |
|  |  |
| 2025-12-16 | 1.0002                      |
|  |  |
| 2025-12-17 | 1.0002                      |
|  |  |
| 2025-12-18 | 1.0002                      |
|  |  |
| 2025-12-19 | 1.0002                      |
|  |  |
| 2025-12-22 | 1.0002                      |
|  |  |
| 2025-12-23 | 1.0002                      |
|  |  |
| 2025-12-24 | 1.0002                      |
|  |  |
| 2025-12-26 | 1.0002                      |
|  |  |
| 2025-12-29 | 1.0002                      |
|  |  |
| 2025-12-30 | 1.0002                      |
|  |  |
| 2025-12-31 | 1.0002                      |
|  |  |

## Part B: Class-Level Information about the Fund

### Class: Class A

- **Minimum Initial Investment:** $5000.00

- **Net Assets of Class:** $1165246506.28

- **Number of Shares Outstanding:** 1165283257.6400

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-12-01 | 1.0001          |
|  |  |
| 2025-12-02 | 1.0002          |
|  |  |
| 2025-12-03 | 1.0002          |
|  |  |
| 2025-12-04 | 1.0002          |
|  |  |
| 2025-12-05 | 1.0002          |
|  |  |
| 2025-12-08 | 1.0002          |
|  |  |
| 2025-12-09 | 1.0002          |
|  |  |
| 2025-12-10 | 1.0002          |
|  |  |
| 2025-12-11 | 1.0002          |
|  |  |
| 2025-12-12 | 1.0002          |
|  |  |
| 2025-12-15 | 1.0002          |
|  |  |
| 2025-12-16 | 1.0002          |
|  |  |
| 2025-12-17 | 1.0002          |
|  |  |
| 2025-12-18 | 1.0002          |
|  |  |
| 2025-12-19 | 1.0002          |
|  |  |
| 2025-12-22 | 1.0002          |
|  |  |
| 2025-12-23 | 1.0002          |
|  |  |
| 2025-12-24 | 1.0002          |
|  |  |
| 2025-12-26 | 1.0002          |
|  |  |
| 2025-12-29 | 1.0002          |
|  |  |
| 2025-12-30 | 1.0002          |
|  |  |
| 2025-12-31 | 1.0002          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-12-01 | $76042273.90              | $76274880.30            |
| 2025-12-02 | $127085717.59             | $81005592.87            |
| 2025-12-03 | $87303738.52              | $114058824.73           |
| 2025-12-04 | $90682835.17              | $92827783.09            |
| 2025-12-05 | $66687600.43              | $55083572.22            |
| 2025-12-08 | $341362685.52             | $61410599.69            |
| 2025-12-09 | $67002129.58              | $329868769.76           |
| 2025-12-10 | $365061238.11             | $375009681.48           |
| 2025-12-11 | $111578366.66             | $100602471.34           |
| 2025-12-12 | $64711939.07              | $41271000.90            |
| 2025-12-15 | $45856294.55              | $54689738.57            |
| 2025-12-16 | $99293153.66              | $56719090.27            |
| 2025-12-17 | $85708911.56              | $84755755.46            |
| 2025-12-18 | $145432742.01             | $108750081.00           |
| 2025-12-19 | $90013097.66              | $160122953.28           |
| 2025-12-22 | $147210779.21             | $128677321.55           |
| 2025-12-23 | $191166670.09             | $67977612.98            |
| 2025-12-24 | $72843374.14              | $166447591.71           |
| 2025-12-26 | $160188061.62             | $152096580.21           |
| 2025-12-29 | $54305079.79              | $48073346.44            |
| 2025-12-30 | $54332789.06              | $51971635.90            |
| 2025-12-31 | $104154353.14             | $47769884.48            |

**Total Gross Subscriptions (Month):** $2648023831.04

**Total Gross Redemptions (Month):** $2455464768.23

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-12-01 | 3.3600%           |
| 2025-12-02 | 3.3600%           |
| 2025-12-03 | 3.3500%           |
| 2025-12-04 | 3.3400%           |
| 2025-12-05 | 3.3100%           |
| 2025-12-08 | 3.3100%           |
| 2025-12-09 | 3.3000%           |
| 2025-12-10 | 3.3000%           |
| 2025-12-11 | 3.2800%           |
| 2025-12-12 | 3.2400%           |
| 2025-12-15 | 3.2100%           |
| 2025-12-16 | 3.2000%           |
| 2025-12-17 | 3.1900%           |
| 2025-12-18 | 3.1800%           |
| 2025-12-19 | 3.1700%           |
| 2025-12-22 | 3.1700%           |
| 2025-12-23 | 3.1700%           |
| 2025-12-24 | 3.1600%           |
| 2025-12-26 | 3.1700%           |
| 2025-12-29 | 3.1800%           |
| 2025-12-30 | 3.1800%           |
| 2025-12-31 | 3.1900%           |

## Part C: Schedule of Portfolio Securities

### Security 1: Government Master Fund

- **C.1 - Title:** Government Master Fund
- **C.6 - Investment Category:** Investment Company
- **Identifiers:** C.3 - CUSIP: 976WHL907, C.3 - LEI: 54930015XY4J2ENG8G36, C.5 - Other ID: 976WHL907
- **C.18 - Value (incl. sponsor support):** $1168809618.36
- **C.18.a - Value (excl. sponsor support):** $1168809618.36
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2026-01-02
- **C.12 - Maturity Date (WAL):** 2026-01-02
- **C.13 - Final Legal Maturity Date:** 2026-01-02
- **Characteristics:** C.9 Eligible Security? Yes, C.14 Has Demand Feature? No, C.15 Has Guarantee? No, C.16 Has Enhancement? No, C.22 Is an Illiquid Security? No, C.20 Is a Daily Liquid Asset? Yes, C.21 Is a Weekly Liquid Asset? Yes, C.23 Categorized at Level 3? No

## N-MFP: Signatures

**Registrant:** UBS Series Funds

**Date:** 2026-01-08

**By:** /s/Rose Ann Bubloski

**Name of Signing Officer:** Rose Ann Bubloski

**Title of Signing Officer:** Vice President