# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001145549-25-038883
**Filing Date:** 2025-6
**Character Count:** 13784
**Document Hash:** 0b0ee450e3aa833031150918394e6b5b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-038883.hdr.sgml**: 20250606

**ACCESSION NUMBER**: 0001145549-25-038883

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250531

**FILED AS OF DATE**: 20250606

**DATE AS OF CHANGE**: 20250606

**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:** 251029851

**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):** 2025-05-31

**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:** $10056259312.57

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $35403211.88

- **Net Assets of Series:** $10020856100.69

- **Number of Shares Outstanding (Series):** 10020452464.2900

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-05-01 | $20752676301.37           | $20952676301.37            | 82.6400%                  | 83.4300%                   |
| 2025-05-02 | $20815839077.25           | $21015839077.25            | 82.6600%                  | 83.4600%                   |
| 2025-05-05 | $20760064133.17           | $20960064133.17            | 82.6400%                  | 83.4300%                   |
| 2025-05-06 | $21116055842.53           | $21316055842.53            | 82.8800%                  | 83.6700%                   |
| 2025-05-07 | $20712772317.19           | $20912772317.19            | 81.4000%                  | 82.1800%                   |
| 2025-05-08 | $20477953642.76           | $20677953642.76            | 80.8300%                  | 81.6200%                   |
| 2025-05-09 | $20357097979.73           | $20557097979.73            | 80.7200%                  | 81.5100%                   |
| 2025-05-12 | $20648182137.63           | $21098447538.47            | 80.9400%                  | 82.7000%                   |
| 2025-05-13 | $20670556834.48           | $21120853664.76            | 80.1800%                  | 81.9200%                   |
| 2025-05-14 | $20282573803.37           | $20732903988.37            | 79.4900%                  | 81.2500%                   |
| 2025-05-15 | $20732785824.72           | $21183145304.72            | 79.8400%                  | 81.5700%                   |
| 2025-05-16 | $20756914664.17           | $21207288039.45            | 79.8400%                  | 81.5700%                   |
| 2025-05-19 | $20722151134.60           | $21172622333.76            | 79.8300%                  | 81.5600%                   |
| 2025-05-20 | $20473915073.93           | $20924415673.93            | 79.6300%                  | 81.3800%                   |
| 2025-05-21 | $20359895786.53           | $20810431036.53            | 79.5300%                  | 81.2900%                   |
| 2025-05-22 | $20837265538.55           | $21386142099.34            | 79.9100%                  | 82.0100%                   |
| 2025-05-23 | $20099687899.58           | $20648602723.33            | 79.3000%                  | 81.4700%                   |
| 2025-05-27 | $20002134811.81           | $20816410467.20            | 78.8500%                  | 82.0600%                   |
| 2025-05-28 | $19592494029.49           | $20406841869.61            | 78.5000%                  | 81.7600%                   |
| 2025-05-29 | $20369268016.86           | $21183666759.36            | 79.1500%                  | 82.3100%                   |
| 2025-05-30 | $20898711393.09           | $21713216119.56            | 79.5500%                  | 82.6500%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-05-01 | 4.3800%             |
| 2025-05-02 | 4.3900%             |
| 2025-05-05 | 4.3800%             |
| 2025-05-06 | 4.3800%             |
| 2025-05-07 | 4.3800%             |
| 2025-05-08 | 4.3700%             |
| 2025-05-09 | 4.3600%             |
| 2025-05-12 | 4.3600%             |
| 2025-05-13 | 4.3600%             |
| 2025-05-14 | 4.3600%             |
| 2025-05-15 | 4.3600%             |
| 2025-05-16 | 4.3700%             |
| 2025-05-19 | 4.3700%             |
| 2025-05-20 | 4.3700%             |
| 2025-05-21 | 4.3600%             |
| 2025-05-22 | 4.3600%             |
| 2025-05-23 | 4.3600%             |
| 2025-05-27 | 4.3600%             |
| 2025-05-28 | 4.3600%             |
| 2025-05-29 | 4.3700%             |
| 2025-05-30 | 4.3800%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-05-01 | 1.0001                      |
|  |  |
| 2025-05-02 | 1.0001                      |
|  |  |
| 2025-05-05 | 1.0001                      |
|  |  |
| 2025-05-06 | 1.0001                      |
|  |  |
| 2025-05-07 | 1.0001                      |
|  |  |
| 2025-05-08 | 1.0001                      |
|  |  |
| 2025-05-09 | 1.0001                      |
|  |  |
| 2025-05-12 | 1.0001                      |
|  |  |
| 2025-05-13 | 1.0001                      |
|  |  |
| 2025-05-14 | 1.0001                      |
|  |  |
| 2025-05-15 | 1.0001                      |
|  |  |
| 2025-05-16 | 1.0000                      |
|  |  |
| 2025-05-19 | 1.0001                      |
|  |  |
| 2025-05-20 | 1.0001                      |
|  |  |
| 2025-05-21 | 1.0001                      |
|  |  |
| 2025-05-22 | 1.0001                      |
|  |  |
| 2025-05-23 | 1.0001                      |
|  |  |
| 2025-05-27 | 1.0001                      |
|  |  |
| 2025-05-28 | 1.0001                      |
|  |  |
| 2025-05-29 | 1.0001                      |
|  |  |
| 2025-05-30 | 1.0001                      |
|  |  |

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

### Class: Basis A

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $10020856100.69

- **Number of Shares Outstanding:** 10020452464.2900

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-05-01 | 1.0001          |
|  |  |
| 2025-05-02 | 1.0001          |
|  |  |
| 2025-05-05 | 1.0001          |
|  |  |
| 2025-05-06 | 1.0001          |
|  |  |
| 2025-05-07 | 1.0001          |
|  |  |
| 2025-05-08 | 1.0001          |
|  |  |
| 2025-05-09 | 1.0001          |
|  |  |
| 2025-05-12 | 1.0001          |
|  |  |
| 2025-05-13 | 1.0001          |
|  |  |
| 2025-05-14 | 1.0001          |
|  |  |
| 2025-05-15 | 1.0001          |
|  |  |
| 2025-05-16 | 1.0000          |
|  |  |
| 2025-05-19 | 1.0001          |
|  |  |
| 2025-05-20 | 1.0001          |
|  |  |
| 2025-05-21 | 1.0001          |
|  |  |
| 2025-05-22 | 1.0001          |
|  |  |
| 2025-05-23 | 1.0001          |
|  |  |
| 2025-05-27 | 1.0001          |
|  |  |
| 2025-05-28 | 1.0001          |
|  |  |
| 2025-05-29 | 1.0001          |
|  |  |
| 2025-05-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-05-01 | $302639448.66             | $48416340.41            |
| 2025-05-02 | $103173195.16             | $149547818.05           |
| 2025-05-05 | $90790068.42              | $53942723.12            |
| 2025-05-06 | $203120445.90             | $57696045.32            |
| 2025-05-07 | $40925006.70              | $54071813.58            |
| 2025-05-08 | $43553844.15              | $43951165.52            |
| 2025-05-09 | $73765245.17              | $140020592.62           |
| 2025-05-12 | $72342880.11              | $75328683.40            |
| 2025-05-13 | $68999790.39              | $55602897.27            |
| 2025-05-14 | $69503185.47              | $69466215.11            |
| 2025-05-15 | $90967977.04              | $40025425.77            |
| 2025-05-16 | $65806790.89              | $36692897.85            |
| 2025-05-19 | $59922237.20              | $50599647.05            |
| 2025-05-20 | $49390294.75              | $52334916.68            |
| 2025-05-21 | $62478615.01              | $52215237.11            |
| 2025-05-22 | $55680392.64              | $37073182.64            |
| 2025-05-23 | $33246079.13              | $54398557.92            |
| 2025-05-27 | $77266028.45              | $76275624.86            |
| 2025-05-28 | $73876387.43              | $41093697.31            |
| 2025-05-29 | $51626779.38              | $53999141.12            |
| 2025-05-30 | $615509595.32             | $48499531.85            |

**Total Gross Subscriptions (Month):** $2304584287.37

**Total Gross Redemptions (Month):** $1291252154.56

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-05-01 | 4.2000%           |
| 2025-05-02 | 4.2100%           |
| 2025-05-05 | 4.2000%           |
| 2025-05-06 | 4.2000%           |
| 2025-05-07 | 4.2000%           |
| 2025-05-08 | 4.1900%           |
| 2025-05-09 | 4.1800%           |
| 2025-05-12 | 4.1800%           |
| 2025-05-13 | 4.1800%           |
| 2025-05-14 | 4.1800%           |
| 2025-05-15 | 4.1800%           |
| 2025-05-16 | 4.1900%           |
| 2025-05-19 | 4.1900%           |
| 2025-05-20 | 4.1900%           |
| 2025-05-21 | 4.1800%           |
| 2025-05-22 | 4.1800%           |
| 2025-05-23 | 4.1800%           |
| 2025-05-27 | 4.1800%           |
| 2025-05-28 | 4.1800%           |
| 2025-05-29 | 4.1900%           |
| 2025-05-30 | 4.2000%           |

**Beneficial/Record Owner Categories**
| Category                  | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Non-financial corporation |  | 7.6800%          | 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):** $10056259312.57
- **C.18.a - Value (excl. sponsor support):** $10056259312.57
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-06-02
- **C.12 - Maturity Date (WAL):** 2025-06-02
- **C.13 - Final Legal Maturity Date:** 2025-06-02
- **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:** 2025-06-06

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

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

**Title of Signing Officer:** Vice President