# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-25-021477
**Filing Date:** 2025-11
**Character Count:** 14268
**Document Hash:** a99d83206d79d7df540a6590a1392b7d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-021477.hdr.sgml**: 20251107

**ACCESSION NUMBER**: 0001410368-25-021477

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251031

**FILED AS OF DATE**: 20251107

**DATE AS OF CHANGE**: 20251107

**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:** 251461873

**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):** 2025-10-31

**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:** $10347388398.55

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $38503312.70

- **Net Assets of Series:** $10308885085.85

- **Number of Shares Outstanding (Series):** 10308217365.6510

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-10-01 | $10990364120.99           | $12985074810.49            | 43.7500%                  | 51.7000%                   |
| 2025-10-02 | $10726624884.14           | $13019355728.64            | 42.5800%                  | 51.6800%                   |
| 2025-10-03 | $10830633013.83           | $13106528717.13            | 42.7000%                  | 51.6700%                   |
| 2025-10-06 | $11095745038.19           | $13149204897.69            | 43.9900%                  | 52.1300%                   |
| 2025-10-07 | $11304412064.01           | $13122528678.91            | 44.7900%                  | 51.9900%                   |
| 2025-10-08 | $10810549983.93           | $13262982916.23            | 42.6000%                  | 52.2700%                   |
| 2025-10-09 | $10287762225.07           | $13057327962.77            | 40.7700%                  | 51.7500%                   |
| 2025-10-10 | $11427928016.56           | $13141186945.56            | 45.0200%                  | 51.7700%                   |
| 2025-10-13 | $0.00                     | $0.00                      | 0.0000%                   | 0.0000%                    |
| 2025-10-14 | $11372759283.16           | $13045963248.16            | 44.7500%                  | 51.3300%                   |
| 2025-10-15 | $10685202870.99           | $12918866154.09            | 42.4800%                  | 51.3600%                   |
| 2025-10-16 | $10384037987.57           | $13108596052.87            | 41.0000%                  | 51.7600%                   |
| 2025-10-17 | $10810175745.47           | $13618986993.37            | 41.7700%                  | 52.6200%                   |
| 2025-10-20 | $11124251032.37           | $13121836102.57            | 44.0000%                  | 51.9000%                   |
| 2025-10-21 | $11448274838.72           | $13144546904.12            | 45.2400%                  | 51.9400%                   |
| 2025-10-22 | $11130209799.63           | $13010023339.63            | 44.0000%                  | 51.4300%                   |
| 2025-10-23 | $10836262459.01           | $12952136269.11            | 42.8100%                  | 51.1600%                   |
| 2025-10-24 | $10952755755.92           | $12965866074.92            | 43.2300%                  | 51.1800%                   |
| 2025-10-27 | $11521554681.32           | $13568858747.92            | 45.7400%                  | 53.8700%                   |
| 2025-10-28 | $11447476121.44           | $13624318772.04            | 45.4400%                  | 54.0800%                   |
| 2025-10-29 | $11004247579.56           | $13706636057.36            | 43.5100%                  | 54.1900%                   |
| 2025-10-30 | $10553480665.94           | $13896906507.54            | 41.9100%                  | 55.1900%                   |
| 2025-10-31 | $11207719451.73           | $14239376237.43            | 44.0600%                  | 55.9700%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-10-01 | 4.3200%             |
| 2025-10-02 | 4.3200%             |
| 2025-10-03 | 4.3200%             |
| 2025-10-06 | 4.3100%             |
| 2025-10-07 | 4.3100%             |
| 2025-10-08 | 4.3000%             |
| 2025-10-09 | 4.3000%             |
| 2025-10-10 | 4.2800%             |
| 2025-10-13 | 0.0000%             |
| 2025-10-14 | 4.2800%             |
| 2025-10-15 | 4.2900%             |
| 2025-10-16 | 4.3000%             |
| 2025-10-17 | 4.3200%             |
| 2025-10-20 | 4.3200%             |
| 2025-10-21 | 4.3200%             |
| 2025-10-22 | 4.3200%             |
| 2025-10-23 | 4.3200%             |
| 2025-10-24 | 4.3300%             |
| 2025-10-27 | 4.3300%             |
| 2025-10-28 | 4.3400%             |
| 2025-10-29 | 4.3400%             |
| 2025-10-30 | 4.3300%             |
| 2025-10-31 | 4.2900%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-10-01 | 1.0002                      |
|  |  |
| 2025-10-02 | 1.0002                      |
|  |  |
| 2025-10-03 | 1.0001                      |
|  |  |
| 2025-10-06 | 1.0002                      |
|  |  |
| 2025-10-07 | 1.0001                      |
|  |  |
| 2025-10-08 | 1.0001                      |
|  |  |
| 2025-10-09 | 1.0001                      |
|  |  |
| 2025-10-10 | 1.0000                      |
|  |  |
| 2025-10-13 | 0.0000                      |
|  |  |
| 2025-10-14 | 1.0002                      |
|  |  |
| 2025-10-15 | 1.0002                      |
|  |  |
| 2025-10-16 | 1.0002                      |
|  |  |
| 2025-10-17 | 1.0001                      |
|  |  |
| 2025-10-20 | 1.0002                      |
|  |  |
| 2025-10-21 | 1.0002                      |
|  |  |
| 2025-10-22 | 1.0002                      |
|  |  |
| 2025-10-23 | 1.0002                      |
|  |  |
| 2025-10-24 | 1.0001                      |
|  |  |
| 2025-10-27 | 1.0002                      |
|  |  |
| 2025-10-28 | 1.0002                      |
|  |  |
| 2025-10-29 | 1.0002                      |
|  |  |
| 2025-10-30 | 1.0001                      |
|  |  |
| 2025-10-31 | 1.0000                      |
|  |  |

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

### Class: Single Class

- **Minimum Initial Investment:** $50000000.00

- **Net Assets of Class:** $10308885085.85

- **Number of Shares Outstanding:** 10308217365.6510

- **Expense Reimbursement/Waiver:** 369377.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-10-01 | 1.0002          |
|  |  |
| 2025-10-02 | 1.0002          |
|  |  |
| 2025-10-03 | 1.0001          |
|  |  |
| 2025-10-06 | 1.0002          |
|  |  |
| 2025-10-07 | 1.0001          |
|  |  |
| 2025-10-08 | 1.0001          |
|  |  |
| 2025-10-09 | 1.0001          |
|  |  |
| 2025-10-10 | 1.0000          |
|  |  |
| 2025-10-13 | 0.0000          |
|  |  |
| 2025-10-14 | 1.0002          |
|  |  |
| 2025-10-15 | 1.0002          |
|  |  |
| 2025-10-16 | 1.0002          |
|  |  |
| 2025-10-17 | 1.0001          |
|  |  |
| 2025-10-20 | 1.0002          |
|  |  |
| 2025-10-21 | 1.0002          |
|  |  |
| 2025-10-22 | 1.0002          |
|  |  |
| 2025-10-23 | 1.0002          |
|  |  |
| 2025-10-24 | 1.0001          |
|  |  |
| 2025-10-27 | 1.0002          |
|  |  |
| 2025-10-28 | 1.0002          |
|  |  |
| 2025-10-29 | 1.0002          |
|  |  |
| 2025-10-30 | 1.0001          |
|  |  |
| 2025-10-31 | 1.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-10-01 | $125723317.06             | $56841198.88            |
| 2025-10-02 | $75444816.04              | $29137957.27            |
| 2025-10-03 | $53641444.86              | $43189072.03            |
| 2025-10-06 | $48079718.57              | $54562711.07            |
| 2025-10-07 | $67641614.44              | $68818776.86            |
| 2025-10-08 | $58646389.43              | $51629302.61            |
| 2025-10-09 | $35712935.31              | $56368513.93            |
| 2025-10-10 | $159344764.64             | $36133501.38            |
| 2025-10-13 | $0.00                     | $0.00                   |
| 2025-10-14 | $99125589.13              | $209076538.46           |
| 2025-10-15 | $48059257.83              | $104779000.63           |
| 2025-10-16 | $108518749.12             | $53570620.65            |
| 2025-10-17 | $583757774.38             | $73598821.80            |
| 2025-10-20 | $89736435.22              | $565418882.09           |
| 2025-10-21 | $77277942.25              | $59115455.03            |
| 2025-10-22 | $61731856.51              | $77551151.84            |
| 2025-10-23 | $74799210.19              | $75159601.44            |
| 2025-10-24 | $78920956.93              | $65506447.30            |
| 2025-10-27 | $54429897.05              | $111123861.56           |
| 2025-10-28 | $86625167.33              | $63855557.87            |
| 2025-10-29 | $55785519.68              | $101593096.42           |
| 2025-10-30 | $71986223.96              | $91520835.97            |
| 2025-10-31 | $278659412.39             | $53086380.09            |

**Total Gross Subscriptions (Month):** $2393648992.32

**Total Gross Redemptions (Month):** $2101637285.18

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-10-01 | 4.1700%           |
| 2025-10-02 | 4.1800%           |
| 2025-10-03 | 4.1800%           |
| 2025-10-06 | 4.1700%           |
| 2025-10-07 | 4.1700%           |
| 2025-10-08 | 4.1600%           |
| 2025-10-09 | 4.1600%           |
| 2025-10-10 | 4.1400%           |
| 2025-10-13 | 0.0000%           |
| 2025-10-14 | 4.1400%           |
| 2025-10-15 | 4.1500%           |
| 2025-10-16 | 4.1600%           |
| 2025-10-17 | 4.1800%           |
| 2025-10-20 | 4.1800%           |
| 2025-10-21 | 4.1800%           |
| 2025-10-22 | 4.1800%           |
| 2025-10-23 | 4.1800%           |
| 2025-10-24 | 4.1900%           |
| 2025-10-27 | 4.1900%           |
| 2025-10-28 | 4.2000%           |
| 2025-10-29 | 4.2000%           |
| 2025-10-30 | 4.1900%           |
| 2025-10-31 | 4.1500%           |

## 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):** $10347388398.55
- **C.18.a - Value (excl. sponsor support):** $10347388398.55
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-11-03
- **C.12 - Maturity Date (WAL):** 2025-11-03
- **C.13 - Final Legal Maturity Date:** 2025-11-03
- **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:** 2025-11-07

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

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

**Title of Signing Officer:** Vice President