# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-26-022302
**Filing Date:** 2026-3
**Character Count:** 13166
**Document Hash:** e7322b7b4e60be2801ff5c14787f687c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-022302.hdr.sgml**: 20260306

**ACCESSION NUMBER**: 0001410368-26-022302

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260228

**FILED AS OF DATE**: 20260306

**DATE AS OF CHANGE**: 20260306

**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:** 26730222

**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 Select Government Preferred Fund (Series ID: S000053132)

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

# 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):** 2026-02-28

**Registrant Full Name:** UBS Series Funds

**CIK Number of Registrant:** 0001060517

**LEI of Registrant:** 54930058UKPXVB81RJ71

**Name of Series:** UBS Select Government Preferred Fund

**LEI of Series:** 549300TPU9BIV8MJY882

**EDGAR Series Identifier:** S000053132

**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:** $14166523282.42

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $41881411.90

- **Net Assets of Series:** $14124641870.52

- **Number of Shares Outstanding (Series):** 14124302217.2300

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2026-02-02 | $18160420836.65           | $19700592536.21            | 65.7400%                  | 71.3200%                   |
| 2026-02-03 | $17901275385.14           | $19441550688.42            | 65.0300%                  | 70.6300%                   |
| 2026-02-04 | $17250167169.51           | $18790601729.95            | 64.1800%                  | 69.9200%                   |
| 2026-02-05 | $17403402497.26           | $18943977806.26            | 64.3800%                  | 70.0800%                   |
| 2026-02-06 | $17515779797.52           | $19056473267.63            | 64.5200%                  | 70.2000%                   |
| 2026-02-09 | $16965057927.92           | $18709943025.57            | 63.7900%                  | 70.3500%                   |
| 2026-02-10 | $16761389470.65           | $18506441389.27            | 62.9900%                  | 69.5500%                   |
| 2026-02-11 | $16617796643.08           | $18516131396.66            | 61.3300%                  | 68.3300%                   |
| 2026-02-12 | $16062226185.04           | $17836731201.04            | 59.8500%                  | 66.4600%                   |
| 2026-02-13 | $15825954812.02           | $17600592313.08            | 59.2800%                  | 65.9300%                   |
| 2026-02-17 | $15736755247.40           | $17511955890.25            | 58.3100%                  | 64.8900%                   |
| 2026-02-18 | $15371657256.00           | $16993850814.92            | 57.5100%                  | 63.5700%                   |
| 2026-02-19 | $15351448424.01           | $16717803233.41            | 57.5700%                  | 62.7000%                   |
| 2026-02-20 | $15521459774.13           | $16765967334.29            | 58.1000%                  | 62.7500%                   |
| 2026-02-23 | $15370532605.63           | $16624579068.16            | 57.4000%                  | 62.0800%                   |
| 2026-02-24 | $14748807313.35           | $16002964755.65            | 56.3800%                  | 61.1800%                   |
| 2026-02-25 | $14603773600.86           | $15858048996.43            | 56.1400%                  | 60.9600%                   |
| 2026-02-26 | $14467351587.67           | $15721735784.79            | 55.9000%                  | 60.7500%                   |
| 2026-02-27 | $14843139662.60           | $16097639477.65            | 56.5300%                  | 61.3000%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2026-02-02 | 3.7600%             |
| 2026-02-03 | 3.7500%             |
| 2026-02-04 | 3.7500%             |
| 2026-02-05 | 3.7500%             |
| 2026-02-06 | 3.7400%             |
| 2026-02-09 | 3.7400%             |
| 2026-02-10 | 3.7300%             |
| 2026-02-11 | 3.7300%             |
| 2026-02-12 | 3.7300%             |
| 2026-02-13 | 3.7300%             |
| 2026-02-17 | 3.7300%             |
| 2026-02-18 | 3.7400%             |
| 2026-02-19 | 3.7400%             |
| 2026-02-20 | 3.7400%             |
| 2026-02-23 | 3.7400%             |
| 2026-02-24 | 3.7400%             |
| 2026-02-25 | 3.7300%             |
| 2026-02-26 | 3.7300%             |
| 2026-02-27 | 3.7300%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2026-02-02 | 1.0001                      |
|  |  |
| 2026-02-03 | 1.0001                      |
|  |  |
| 2026-02-04 | 1.0001                      |
|  |  |
| 2026-02-05 | 1.0001                      |
|  |  |
| 2026-02-06 | 1.0001                      |
|  |  |
| 2026-02-09 | 1.0001                      |
|  |  |
| 2026-02-10 | 1.0001                      |
|  |  |
| 2026-02-11 | 1.0001                      |
|  |  |
| 2026-02-12 | 1.0001                      |
|  |  |
| 2026-02-13 | 1.0000                      |
|  |  |
| 2026-02-17 | 1.0000                      |
|  |  |
| 2026-02-18 | 1.0001                      |
|  |  |
| 2026-02-19 | 1.0001                      |
|  |  |
| 2026-02-20 | 1.0000                      |
|  |  |
| 2026-02-23 | 1.0001                      |
|  |  |
| 2026-02-24 | 1.0000                      |
|  |  |
| 2026-02-25 | 1.0001                      |
|  |  |
| 2026-02-26 | 1.0001                      |
|  |  |
| 2026-02-27 | 1.0000                      |
|  |  |

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

### Class: Basis A

- **Minimum Initial Investment:** $50000000.00

- **Net Assets of Class:** $14124641870.52

- **Number of Shares Outstanding:** 14124302217.2300

- **Expense Reimbursement/Waiver:** 450957.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2026-02-02 | 1.0001          |
|  |  |
| 2026-02-03 | 1.0001          |
|  |  |
| 2026-02-04 | 1.0001          |
|  |  |
| 2026-02-05 | 1.0001          |
|  |  |
| 2026-02-06 | 1.0001          |
|  |  |
| 2026-02-09 | 1.0001          |
|  |  |
| 2026-02-10 | 1.0001          |
|  |  |
| 2026-02-11 | 1.0001          |
|  |  |
| 2026-02-12 | 1.0001          |
|  |  |
| 2026-02-13 | 1.0000          |
|  |  |
| 2026-02-17 | 1.0000          |
|  |  |
| 2026-02-18 | 1.0001          |
|  |  |
| 2026-02-19 | 1.0001          |
|  |  |
| 2026-02-20 | 1.0000          |
|  |  |
| 2026-02-23 | 1.0001          |
|  |  |
| 2026-02-24 | 1.0000          |
|  |  |
| 2026-02-25 | 1.0001          |
|  |  |
| 2026-02-26 | 1.0001          |
|  |  |
| 2026-02-27 | 1.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2026-02-02 | $671966038.61             | $149197217.01           |
| 2026-02-03 | $116002483.77             | $360812982.61           |
| 2026-02-04 | $144433889.61             | $587402768.73           |
| 2026-02-05 | $155383425.68             | $182126830.27           |
| 2026-02-06 | $358113650.73             | $167656705.61           |
| 2026-02-09 | $168161864.12             | $577671116.23           |
| 2026-02-10 | $183895505.62             | $401565340.86           |
| 2026-02-11 | $63818606.46              | $48476188.76            |
| 2026-02-12 | $179514514.35             | $409860487.37           |
| 2026-02-13 | $317291108.18             | $54871519.98            |
| 2026-02-17 | $174935865.57             | $165998211.17           |
| 2026-02-18 | $69783940.75              | $122732858.39           |
| 2026-02-19 | $29448388.65              | $195608294.42           |
| 2026-02-20 | $371081759.81             | $99538568.59            |
| 2026-02-23 | $168556779.42             | $219373856.52           |
| 2026-02-24 | $30064829.77              | $271067469.92           |
| 2026-02-25 | $49610359.91              | $105580486.19           |
| 2026-02-26 | $79906518.16              | $269533053.54           |
| 2026-02-27 | $96371197.64              | $128974310.65           |

**Total Gross Subscriptions (Month):** $3428340726.81

**Total Gross Redemptions (Month):** $4518048266.82

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2026-02-02 | 3.6100%           |
| 2026-02-03 | 3.6100%           |
| 2026-02-04 | 3.6100%           |
| 2026-02-05 | 3.6100%           |
| 2026-02-06 | 3.6000%           |
| 2026-02-09 | 3.6000%           |
| 2026-02-10 | 3.5900%           |
| 2026-02-11 | 3.5900%           |
| 2026-02-12 | 3.5900%           |
| 2026-02-13 | 3.5900%           |
| 2026-02-17 | 3.5900%           |
| 2026-02-18 | 3.6000%           |
| 2026-02-19 | 3.6000%           |
| 2026-02-20 | 3.6000%           |
| 2026-02-23 | 3.6000%           |
| 2026-02-24 | 3.6000%           |
| 2026-02-25 | 3.5900%           |
| 2026-02-26 | 3.5900%           |
| 2026-02-27 | 3.5900%           |

**Beneficial/Record Owner Categories**
| Category        | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Retail investor |  | 6.6400%          | 0.0000%              |
| Other           | IND FID AS EXEC  | 10.7200%         | 0.0000%              |

## 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):** $14166523282.42
- **C.18.a - Value (excl. sponsor support):** $14166523282.42
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2026-03-02
- **C.12 - Maturity Date (WAL):** 2026-03-02
- **C.13 - Final Legal Maturity Date:** 2026-03-02
- **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:** 2026-03-06

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

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

**Title of Signing Officer:** Vice President