# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-25-033521
**Filing Date:** 2025-12
**Character Count:** 12812
**Document Hash:** e4c9bdd7281a413670d58b2b38687bd6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-033521.hdr.sgml**: 20251205

**ACCESSION NUMBER**: 0001410368-25-033521

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251130

**FILED AS OF DATE**: 20251205

**DATE AS OF CHANGE**: 20251205

**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:** 251552578

**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 Prime Preferred Fund (Series ID: S000052307)

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

# 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):** 2025-11-30

**Registrant Full Name:** UBS Series Funds

**CIK Number of Registrant:** 0001060517

**LEI of Registrant:** 54930058UKPXVB81RJ71

**Name of Series:** UBS Prime Preferred Fund

**LEI of Series:** 5493001YQBD9A4ZH6D79

**EDGAR Series Identifier:** S000052307

**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:** Prime

- **Is this a Retail Money Market Fund?:** Yes

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

- **WAM:** 1 days

- **WAL:** 1 days

- **Total Value of Portfolio Securities:** $10131415252.08

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $33829192.84

- **Net Assets of Series:** $10097586059.24

- **Number of Shares Outstanding (Series):** 10096918339.1910

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-11-03 | $11852359267.90           | $13954925587.80            | 46.1400%                  | 54.3300%                   |
| 2025-11-04 | $11657854219.76           | $13748056476.86            | 45.4900%                  | 53.6500%                   |
| 2025-11-05 | $11473395851.25           | $13611962809.89            | 44.7500%                  | 53.0900%                   |
| 2025-11-06 | $11541225858.40           | $13687799969.34            | 44.6800%                  | 52.9900%                   |
| 2025-11-07 | $11592800087.69           | $13239734828.69            | 45.0000%                  | 51.4000%                   |
| 2025-11-10 | $12011477336.00           | $13009828309.75            | 47.0500%                  | 50.9600%                   |
| 2025-11-11 | $0.00                     | $0.00                      | 0.0000%                   | 0.0000%                    |
| 2025-11-12 | $11763770217.12           | $12947135595.12            | 46.2000%                  | 50.8400%                   |
| 2025-11-13 | $11602659349.22           | $13195364583.27            | 45.2800%                  | 51.5000%                   |
| 2025-11-14 | $11698626662.93           | $13264421912.43            | 45.5700%                  | 51.6700%                   |
| 2025-11-17 | $10861983267.20           | $13052679928.15            | 42.5800%                  | 51.1700%                   |
| 2025-11-18 | $11355256689.66           | $13191214538.36            | 44.5000%                  | 51.6900%                   |
| 2025-11-19 | $11245515145.11           | $13151679304.81            | 43.9700%                  | 51.4200%                   |
| 2025-11-20 | $11036073453.24           | $13195261607.94            | 43.3000%                  | 51.7700%                   |
| 2025-11-21 | $11550812058.41           | $13085359546.11            | 45.3300%                  | 51.3500%                   |
| 2025-11-24 | $11034675997.73           | $13018949038.83            | 43.5100%                  | 51.3300%                   |
| 2025-11-25 | $11924262382.19           | $13349542561.89            | 47.0800%                  | 52.7100%                   |
| 2025-11-26 | $10910680343.60           | $13214508684.40            | 42.9400%                  | 52.0000%                   |
| 2025-11-28 | $11496451629.63           | $13135843363.73            | 45.1300%                  | 51.5600%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-11-03 | 4.2700%             |
| 2025-11-04 | 4.2400%             |
| 2025-11-05 | 4.2100%             |
| 2025-11-06 | 4.1900%             |
| 2025-11-07 | 4.1200%             |
| 2025-11-10 | 4.1000%             |
| 2025-11-11 | 0.0000%             |
| 2025-11-12 | 4.1000%             |
| 2025-11-13 | 4.1000%             |
| 2025-11-14 | 4.1100%             |
| 2025-11-17 | 4.1100%             |
| 2025-11-18 | 4.1100%             |
| 2025-11-19 | 4.1100%             |
| 2025-11-20 | 4.1000%             |
| 2025-11-21 | 4.0900%             |
| 2025-11-24 | 4.0900%             |
| 2025-11-25 | 4.0900%             |
| 2025-11-26 | 4.1000%             |
| 2025-11-28 | 4.1400%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-11-03 | 1.0001                      |
|  |  |
| 2025-11-04 | 1.0001                      |
|  |  |
| 2025-11-05 | 1.0001                      |
|  |  |
| 2025-11-06 | 1.0001                      |
|  |  |
| 2025-11-07 | 1.0000                      |
|  |  |
| 2025-11-10 | 1.0001                      |
|  |  |
| 2025-11-11 | 0.0000                      |
|  |  |
| 2025-11-12 | 1.0001                      |
|  |  |
| 2025-11-13 | 1.0001                      |
|  |  |
| 2025-11-14 | 1.0000                      |
|  |  |
| 2025-11-17 | 1.0001                      |
|  |  |
| 2025-11-18 | 1.0001                      |
|  |  |
| 2025-11-19 | 1.0001                      |
|  |  |
| 2025-11-20 | 1.0001                      |
|  |  |
| 2025-11-21 | 1.0000                      |
|  |  |
| 2025-11-24 | 1.0001                      |
|  |  |
| 2025-11-25 | 1.0001                      |
|  |  |
| 2025-11-26 | 1.0001                      |
|  |  |
| 2025-11-28 | 1.0000                      |
|  |  |

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

### Class: Single Class

- **Minimum Initial Investment:** $50000000.00

- **Net Assets of Class:** $10097586059.24

- **Number of Shares Outstanding:** 10096918339.1910

- **Expense Reimbursement/Waiver:** 314285.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-11-03 | 1.0001          |
|  |  |
| 2025-11-04 | 1.0001          |
|  |  |
| 2025-11-05 | 1.0001          |
|  |  |
| 2025-11-06 | 1.0001          |
|  |  |
| 2025-11-07 | 1.0000          |
|  |  |
| 2025-11-10 | 1.0001          |
|  |  |
| 2025-11-11 | 0.0000          |
|  |  |
| 2025-11-12 | 1.0001          |
|  |  |
| 2025-11-13 | 1.0001          |
|  |  |
| 2025-11-14 | 1.0000          |
|  |  |
| 2025-11-17 | 1.0001          |
|  |  |
| 2025-11-18 | 1.0001          |
|  |  |
| 2025-11-19 | 1.0001          |
|  |  |
| 2025-11-20 | 1.0001          |
|  |  |
| 2025-11-21 | 1.0000          |
|  |  |
| 2025-11-24 | 1.0001          |
|  |  |
| 2025-11-25 | 1.0001          |
|  |  |
| 2025-11-26 | 1.0001          |
|  |  |
| 2025-11-28 | 1.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-11-03 | $183236255.29             | $65270822.32            |
| 2025-11-04 | $67299585.27              | $118725715.95           |
| 2025-11-05 | $51911074.36              | $77594561.07            |
| 2025-11-06 | $89825840.09              | $41907504.04            |
| 2025-11-07 | $46707627.10              | $144245595.23           |
| 2025-11-10 | $66352365.11              | $66509798.31            |
| 2025-11-11 | $0.00                     | $0.00                   |
| 2025-11-12 | $62850929.67              | $95817491.32            |
| 2025-11-13 | $50581665.09              | $46004289.21            |
| 2025-11-14 | $87330674.97              | $63943712.68            |
| 2025-11-17 | $37842628.99              | $79004754.86            |
| 2025-11-18 | $62271471.62              | $56398888.69            |
| 2025-11-19 | $27089045.08              | $78622415.08            |
| 2025-11-20 | $67314762.05              | $58545345.05            |
| 2025-11-21 | $38049353.74              | $62174821.42            |
| 2025-11-24 | $56915220.65              | $92577506.73            |
| 2025-11-25 | $48856121.75              | $105445288.31           |
| 2025-11-26 | $66844479.36              | $45074597.74            |
| 2025-11-28 | $22863194.80              | $47578213.44            |

**Total Gross Subscriptions (Month):** $1134142294.99

**Total Gross Redemptions (Month):** $1345441321.45

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-11-03 | 4.1300%           |
| 2025-11-04 | 4.1000%           |
| 2025-11-05 | 4.0700%           |
| 2025-11-06 | 4.0500%           |
| 2025-11-07 | 3.9800%           |
| 2025-11-10 | 3.9600%           |
| 2025-11-11 | 0.0000%           |
| 2025-11-12 | 3.9600%           |
| 2025-11-13 | 3.9600%           |
| 2025-11-14 | 3.9700%           |
| 2025-11-17 | 3.9700%           |
| 2025-11-18 | 3.9700%           |
| 2025-11-19 | 3.9700%           |
| 2025-11-20 | 3.9600%           |
| 2025-11-21 | 3.9500%           |
| 2025-11-24 | 3.9500%           |
| 2025-11-25 | 3.9500%           |
| 2025-11-26 | 3.9600%           |
| 2025-11-28 | 4.0000%           |

## Part C: Schedule of Portfolio Securities

### Security 1: Prime CNAV Master Fund

- **C.1 - Title:** Prime CNAV Master Fund
- **C.6 - Investment Category:** Investment Company
- **Identifiers:** C.3 - CUSIP: 927XQC905, C.3 - LEI: 549300K8VKMIOPMVLW91, C.5 - Other ID: 927XQC905
- **C.18 - Value (incl. sponsor support):** $10131415252.08
- **C.18.a - Value (excl. sponsor support):** $10131415252.08
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-12-01
- **C.12 - Maturity Date (WAL):** 2025-12-01
- **C.13 - Final Legal Maturity Date:** 2025-12-01
- **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:** 2025-12-05

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

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

**Title of Signing Officer:** Vice President