# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-25-014063
**Filing Date:** 2025-10
**Character Count:** 13548
**Document Hash:** 9139be3e4b32218cc65e3135ce77b8c8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-014063.hdr.sgml**: 20251007

**ACCESSION NUMBER**: 0001410368-25-014063

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250930

**FILED AS OF DATE**: 20251007

**DATE AS OF CHANGE**: 20251007

**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:** 251379624

**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 Government Institutional Fund (Series ID: S000053131)

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

# 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):** 2025-09-30

**Registrant Full Name:** UBS Series Funds

**CIK Number of Registrant:** 0001060517

**LEI of Registrant:** 54930058UKPXVB81RJ71

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

**LEI of Series:** 549300TZ2QEM4T3XX713

**EDGAR Series Identifier:** S000053131

**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:** $9508855730.43

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $33057789.49

- **Net Assets of Series:** $9475797940.94

- **Number of Shares Outstanding (Series):** 9475394304.5400

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-09-02 | $20225765142.15           | $21653771587.46            | 79.5100%                  | 85.1200%                   |
| 2025-09-03 | $20214062723.33           | $21642273765.96            | 79.4900%                  | 85.1100%                   |
| 2025-09-04 | $19903129303.47           | $21456646667.29            | 79.2400%                  | 85.4200%                   |
| 2025-09-05 | $20048128930.72           | $21601816265.40            | 79.3400%                  | 85.4900%                   |
| 2025-09-08 | $20693147531.52           | $22247290242.18            | 79.8500%                  | 85.8500%                   |
| 2025-09-09 | $20183760870.87           | $21738045737.20            | 78.6600%                  | 84.7200%                   |
| 2025-09-10 | $20367629475.04           | $21922066719.89            | 77.3400%                  | 83.2400%                   |
| 2025-09-11 | $19573749032.83           | $21128356718.88            | 76.6300%                  | 82.7200%                   |
| 2025-09-12 | $19507543052.67           | $21062339966.55            | 76.5600%                  | 82.6600%                   |
| 2025-09-15 | $19516632772.33           | $21071852392.61            | 76.5700%                  | 82.6700%                   |
| 2025-09-16 | $19458061962.23           | $21013462131.03            | 76.1400%                  | 82.2300%                   |
| 2025-09-17 | $19026619528.64           | $20582211672.80            | 74.9900%                  | 81.1200%                   |
| 2025-09-18 | $19062552149.19           | $20618266090.39            | 75.0200%                  | 81.1500%                   |
| 2025-09-19 | $19203523500.98           | $20759382411.55            | 75.1500%                  | 81.2400%                   |
| 2025-09-22 | $18682493557.17           | $20238805220.79            | 74.6300%                  | 80.8500%                   |
| 2025-09-23 | $18647098785.59           | $20203560391.22            | 74.3300%                  | 80.5300%                   |
| 2025-09-24 | $18326480529.03           | $19883131171.54            | 73.8000%                  | 80.0700%                   |
| 2025-09-25 | $18434984803.39           | $19991797877.90            | 73.9200%                  | 80.1600%                   |
| 2025-09-26 | $18405328203.84           | $19962254242.41            | 73.8700%                  | 80.1200%                   |
| 2025-09-29 | $18484465836.12           | $20166065674.07            | 73.9500%                  | 80.6800%                   |
| 2025-09-30 | $18130010278.70           | $19811758760.94            | 73.5900%                  | 80.4200%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-09-02 | 4.3400%             |
| 2025-09-03 | 4.3400%             |
| 2025-09-04 | 4.3400%             |
| 2025-09-05 | 4.3400%             |
| 2025-09-08 | 4.3400%             |
| 2025-09-09 | 4.3400%             |
| 2025-09-10 | 4.3300%             |
| 2025-09-11 | 4.3300%             |
| 2025-09-12 | 4.3100%             |
| 2025-09-15 | 4.3100%             |
| 2025-09-16 | 4.3100%             |
| 2025-09-17 | 4.3000%             |
| 2025-09-18 | 4.2900%             |
| 2025-09-19 | 4.2300%             |
| 2025-09-22 | 4.2100%             |
| 2025-09-23 | 4.1900%             |
| 2025-09-24 | 4.1800%             |
| 2025-09-25 | 4.1700%             |
| 2025-09-26 | 4.1800%             |
| 2025-09-29 | 4.1800%             |
| 2025-09-30 | 4.1800%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-09-02 | 1.0002                      |
|  |  |
| 2025-09-03 | 1.0002                      |
|  |  |
| 2025-09-04 | 1.0002                      |
|  |  |
| 2025-09-05 | 1.0003                      |
|  |  |
| 2025-09-08 | 1.0003                      |
|  |  |
| 2025-09-09 | 1.0003                      |
|  |  |
| 2025-09-10 | 1.0003                      |
|  |  |
| 2025-09-11 | 1.0003                      |
|  |  |
| 2025-09-12 | 1.0002                      |
|  |  |
| 2025-09-15 | 1.0003                      |
|  |  |
| 2025-09-16 | 1.0003                      |
|  |  |
| 2025-09-17 | 1.0003                      |
|  |  |
| 2025-09-18 | 1.0003                      |
|  |  |
| 2025-09-19 | 1.0002                      |
|  |  |
| 2025-09-22 | 1.0002                      |
|  |  |
| 2025-09-23 | 1.0002                      |
|  |  |
| 2025-09-24 | 1.0002                      |
|  |  |
| 2025-09-25 | 1.0002                      |
|  |  |
| 2025-09-26 | 1.0002                      |
|  |  |
| 2025-09-29 | 1.0002                      |
|  |  |
| 2025-09-30 | 1.0002                      |
|  |  |

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

### Class: Basis A

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $9475797940.94

- **Number of Shares Outstanding:** 9475394304.5400

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-09-02 | 1.0002          |
|  |  |
| 2025-09-03 | 1.0002          |
|  |  |
| 2025-09-04 | 1.0002          |
|  |  |
| 2025-09-05 | 1.0003          |
|  |  |
| 2025-09-08 | 1.0003          |
|  |  |
| 2025-09-09 | 1.0003          |
|  |  |
| 2025-09-10 | 1.0003          |
|  |  |
| 2025-09-11 | 1.0003          |
|  |  |
| 2025-09-12 | 1.0002          |
|  |  |
| 2025-09-15 | 1.0003          |
|  |  |
| 2025-09-16 | 1.0003          |
|  |  |
| 2025-09-17 | 1.0003          |
|  |  |
| 2025-09-18 | 1.0003          |
|  |  |
| 2025-09-19 | 1.0002          |
|  |  |
| 2025-09-22 | 1.0002          |
|  |  |
| 2025-09-23 | 1.0002          |
|  |  |
| 2025-09-24 | 1.0002          |
|  |  |
| 2025-09-25 | 1.0002          |
|  |  |
| 2025-09-26 | 1.0002          |
|  |  |
| 2025-09-29 | 1.0002          |
|  |  |
| 2025-09-30 | 1.0002          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-09-02 | $149866077.45             | $100042334.60           |
| 2025-09-03 | $115250077.17             | $65125724.24            |
| 2025-09-04 | $134006100.58             | $70176297.45            |
| 2025-09-05 | $85904629.03              | $74216783.72            |
| 2025-09-08 | $82306396.12              | $158183807.98           |
| 2025-09-09 | $154376805.81             | $66704454.40            |
| 2025-09-10 | $117145034.08             | $112850136.36           |
| 2025-09-11 | $56912211.03              | $122238533.71           |
| 2025-09-12 | $62182910.60              | $245603545.94           |
| 2025-09-15 | $83589603.92              | $86264629.70            |
| 2025-09-16 | $258338858.26             | $68032417.30            |
| 2025-09-17 | $81555643.55              | $149232914.74           |
| 2025-09-18 | $107908645.10             | $117185680.90           |
| 2025-09-19 | $83865576.47              | $49324835.79            |
| 2025-09-22 | $46153710.77              | $66389971.93            |
| 2025-09-23 | $50828804.95              | $84287418.68            |
| 2025-09-24 | $48519351.10              | $55588896.83            |
| 2025-09-25 | $61975091.26              | $67257127.39            |
| 2025-09-26 | $78706606.52              | $234967457.52           |
| 2025-09-29 | $54306352.66              | $72254759.08            |
| 2025-09-30 | $62349391.68              | $125109785.68           |

**Total Gross Subscriptions (Month):** $1976047878.11

**Total Gross Redemptions (Month):** $2191037513.94

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-09-02 | 4.1600%           |
| 2025-09-03 | 4.1600%           |
| 2025-09-04 | 4.1600%           |
| 2025-09-05 | 4.1600%           |
| 2025-09-08 | 4.1600%           |
| 2025-09-09 | 4.1600%           |
| 2025-09-10 | 4.1500%           |
| 2025-09-11 | 4.1500%           |
| 2025-09-12 | 4.1300%           |
| 2025-09-15 | 4.1300%           |
| 2025-09-16 | 4.1300%           |
| 2025-09-17 | 4.1200%           |
| 2025-09-18 | 4.1100%           |
| 2025-09-19 | 4.0500%           |
| 2025-09-22 | 4.0300%           |
| 2025-09-23 | 4.0100%           |
| 2025-09-24 | 4.0000%           |
| 2025-09-25 | 3.9900%           |
| 2025-09-26 | 4.0000%           |
| 2025-09-29 | 4.0000%           |
| 2025-09-30 | 4.0000%           |

## 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):** $9508855730.43
- **C.18.a - Value (excl. sponsor support):** $9508855730.43
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-10-01
- **C.12 - Maturity Date (WAL):** 2025-10-01
- **C.13 - Final Legal Maturity Date:** 2025-10-01
- **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:** 2025-10-07

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

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

**Title of Signing Officer:** Vice President