# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001145549-25-058049
**Filing Date:** 2025-9
**Character Count:** 13802
**Document Hash:** a433d3b3bc19a81a53c50cd7e0922bd0
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-058049.hdr.sgml**: 20250908

**ACCESSION NUMBER**: 0001145549-25-058049

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250831

**FILED AS OF DATE**: 20250908

**DATE AS OF CHANGE**: 20250908

**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:** 251299402

**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 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):** 2025-08-31

**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:** $13262657769.48

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $47329967.50

- **Net Assets of Series:** $13215327801.98

- **Number of Shares Outstanding (Series):** 13214650518.0900

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-08-01 | $19842910200.13           | $20341911503.45            | 79.7100%                  | 81.7200%                   |
| 2025-08-04 | $20192275331.85           | $20576276186.61            | 80.3600%                  | 81.8900%                   |
| 2025-08-05 | $19933225738.04           | $20187226114.42            | 80.5800%                  | 81.6100%                   |
| 2025-08-06 | $20283869386.05           | $20537870830.55            | 80.8600%                  | 81.8700%                   |
| 2025-08-07 | $19945757479.21           | $20396012379.21            | 80.7700%                  | 82.5900%                   |
| 2025-08-08 | $20141378584.88           | $20591664634.60            | 80.9000%                  | 82.7100%                   |
| 2025-08-11 | $20345572634.00           | $21133200376.23            | 81.0600%                  | 84.2000%                   |
| 2025-08-12 | $20084663590.48           | $20872373309.62            | 80.8600%                  | 84.0300%                   |
| 2025-08-13 | $20398255893.41           | $21186015465.07            | 81.0900%                  | 84.2300%                   |
| 2025-08-14 | $19953109978.69           | $20740931206.51            | 80.7500%                  | 83.9400%                   |
| 2025-08-15 | $20606962113.66           | $21394834254.88            | 81.1100%                  | 84.2100%                   |
| 2025-08-18 | $20519794034.29           | $21649512839.85            | 81.0500%                  | 85.5100%                   |
| 2025-08-19 | $20263651589.71           | $21393480244.10            | 80.0600%                  | 84.5200%                   |
| 2025-08-20 | $20253446952.17           | $21383378943.04            | 80.0500%                  | 84.5100%                   |
| 2025-08-21 | $19974465999.82           | $21153531165.19            | 80.1000%                  | 84.8200%                   |
| 2025-08-22 | $19115931406.43           | $20295138072.48            | 79.3700%                  | 84.2700%                   |
| 2025-08-25 | $19227878547.59           | $20539524545.22            | 79.4700%                  | 84.8900%                   |
| 2025-08-26 | $19847290535.39           | $21159064946.50            | 79.6000%                  | 84.8600%                   |
| 2025-08-27 | $19722526851.44           | $21034429680.24            | 79.4900%                  | 84.7800%                   |
| 2025-08-28 | $19952417190.19           | $21379812679.60            | 79.6800%                  | 85.3800%                   |
| 2025-08-29 | $19787022505.99           | $21214452142.19            | 79.5200%                  | 85.2600%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-08-01 | 4.3800%             |
| 2025-08-04 | 4.3700%             |
| 2025-08-05 | 4.3700%             |
| 2025-08-06 | 4.3700%             |
| 2025-08-07 | 4.3600%             |
| 2025-08-08 | 4.3600%             |
| 2025-08-11 | 4.3600%             |
| 2025-08-12 | 4.3600%             |
| 2025-08-13 | 4.3600%             |
| 2025-08-14 | 4.3600%             |
| 2025-08-15 | 4.3600%             |
| 2025-08-18 | 4.3600%             |
| 2025-08-19 | 4.3600%             |
| 2025-08-20 | 4.3500%             |
| 2025-08-21 | 4.3500%             |
| 2025-08-22 | 4.3400%             |
| 2025-08-25 | 4.3400%             |
| 2025-08-26 | 4.3500%             |
| 2025-08-27 | 4.3500%             |
| 2025-08-28 | 4.3500%             |
| 2025-08-29 | 4.3400%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-08-01 | 1.0002                      |
|  |  |
| 2025-08-04 | 1.0002                      |
|  |  |
| 2025-08-05 | 1.0002                      |
|  |  |
| 2025-08-06 | 1.0002                      |
|  |  |
| 2025-08-07 | 1.0002                      |
|  |  |
| 2025-08-08 | 1.0002                      |
|  |  |
| 2025-08-11 | 1.0002                      |
|  |  |
| 2025-08-12 | 1.0002                      |
|  |  |
| 2025-08-13 | 1.0003                      |
|  |  |
| 2025-08-14 | 1.0002                      |
|  |  |
| 2025-08-15 | 1.0002                      |
|  |  |
| 2025-08-18 | 1.0002                      |
|  |  |
| 2025-08-19 | 1.0002                      |
|  |  |
| 2025-08-20 | 1.0002                      |
|  |  |
| 2025-08-21 | 1.0002                      |
|  |  |
| 2025-08-22 | 1.0002                      |
|  |  |
| 2025-08-25 | 1.0002                      |
|  |  |
| 2025-08-26 | 1.0002                      |
|  |  |
| 2025-08-27 | 1.0002                      |
|  |  |
| 2025-08-28 | 1.0002                      |
|  |  |
| 2025-08-29 | 1.0002                      |
|  |  |

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

### Class: Basis A

- **Minimum Initial Investment:** $50000000.00

- **Net Assets of Class:** $13215327801.98

- **Number of Shares Outstanding:** 13214650518.0900

- **Expense Reimbursement/Waiver:** 459008.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-08-01 | 1.0002          |
|  |  |
| 2025-08-04 | 1.0002          |
|  |  |
| 2025-08-05 | 1.0002          |
|  |  |
| 2025-08-06 | 1.0002          |
|  |  |
| 2025-08-07 | 1.0002          |
|  |  |
| 2025-08-08 | 1.0002          |
|  |  |
| 2025-08-11 | 1.0002          |
|  |  |
| 2025-08-12 | 1.0002          |
|  |  |
| 2025-08-13 | 1.0003          |
|  |  |
| 2025-08-14 | 1.0002          |
|  |  |
| 2025-08-15 | 1.0002          |
|  |  |
| 2025-08-18 | 1.0002          |
|  |  |
| 2025-08-19 | 1.0002          |
|  |  |
| 2025-08-20 | 1.0002          |
|  |  |
| 2025-08-21 | 1.0002          |
|  |  |
| 2025-08-22 | 1.0002          |
|  |  |
| 2025-08-25 | 1.0002          |
|  |  |
| 2025-08-26 | 1.0002          |
|  |  |
| 2025-08-27 | 1.0002          |
|  |  |
| 2025-08-28 | 1.0002          |
|  |  |
| 2025-08-29 | 1.0002          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-08-01 | $401800718.50             | $677711071.79           |
| 2025-08-04 | $106835904.45             | $64945506.49            |
| 2025-08-05 | $102784293.01             | $297917237.26           |
| 2025-08-06 | $52982351.11              | $83601531.58            |
| 2025-08-07 | $104026326.18             | $106426974.40           |
| 2025-08-08 | $306456560.00             | $156597703.77           |
| 2025-08-11 | $106497782.32             | $113627961.53           |
| 2025-08-12 | $241878448.79             | $222732134.94           |
| 2025-08-13 | $216004722.01             | $58503252.48            |
| 2025-08-14 | $93206457.00              | $260894864.29           |
| 2025-08-15 | $263284511.89             | $124407886.24           |
| 2025-08-18 | $132757999.14             | $68579470.07            |
| 2025-08-19 | $70252210.38              | $100578253.00           |
| 2025-08-20 | $181370864.67             | $135875518.33           |
| 2025-08-21 | $53596249.06              | $76715514.70            |
| 2025-08-22 | $22343259.78              | $736814459.37           |
| 2025-08-25 | $68775765.95              | $145662980.24           |
| 2025-08-26 | $746286219.34             | $67398958.57            |
| 2025-08-27 | $48539361.17              | $287843266.90           |
| 2025-08-28 | $415093108.56             | $126063036.08           |
| 2025-08-29 | $230427485.98             | $252825853.32           |

**Total Gross Subscriptions (Month):** $3965200599.29

**Total Gross Redemptions (Month):** $4165723435.35

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-08-01 | 4.2400%           |
| 2025-08-04 | 4.2300%           |
| 2025-08-05 | 4.2300%           |
| 2025-08-06 | 4.2300%           |
| 2025-08-07 | 4.2200%           |
| 2025-08-08 | 4.2200%           |
| 2025-08-11 | 4.2200%           |
| 2025-08-12 | 4.2200%           |
| 2025-08-13 | 4.2200%           |
| 2025-08-14 | 4.2200%           |
| 2025-08-15 | 4.2200%           |
| 2025-08-18 | 4.2200%           |
| 2025-08-19 | 4.2200%           |
| 2025-08-20 | 4.2100%           |
| 2025-08-21 | 4.2100%           |
| 2025-08-22 | 4.2000%           |
| 2025-08-25 | 4.2000%           |
| 2025-08-26 | 4.2100%           |
| 2025-08-27 | 4.2100%           |
| 2025-08-28 | 4.2100%           |
| 2025-08-29 | 4.2000%           |

**Beneficial/Record Owner Categories**
| Category   | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Other      | IND FID AS EXEC  | 14.1600%         | 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):** $13262657769.48
- **C.18.a - Value (excl. sponsor support):** $13262657769.48
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-09-02
- **C.12 - Maturity Date (WAL):** 2025-09-02
- **C.13 - Final Legal Maturity Date:** 2025-09-02
- **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:** 2025-09-08

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

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

**Title of Signing Officer:** Vice President