# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-26-034967
**Filing Date:** 2026-4
**Character Count:** 14183
**Document Hash:** 5e305097161d6a0cb03a6c56775feb44
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-034967.hdr.sgml**: 20260407

**ACCESSION NUMBER**: 0001410368-26-034967

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260331

**FILED AS OF DATE**: 20260407

**DATE AS OF CHANGE**: 20260407

**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:** 26843743

**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):** 2026-03-31

**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:** $13315606522.74

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $42793351.44

- **Net Assets of Series:** $13272813171.30

- **Number of Shares Outstanding (Series):** 13272473518.0100

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2026-03-02 | $14738105759.36           | $15992906604.94            | 56.3600%                  | 61.1600%                   |
| 2026-03-03 | $14715621859.04           | $16097574912.45            | 55.8700%                  | 61.1200%                   |
| 2026-03-04 | $14395826130.09           | $15777884156.40            | 55.3300%                  | 60.6400%                   |
| 2026-03-05 | $14544902209.47           | $16131819910.21            | 55.2300%                  | 61.2500%                   |
| 2026-03-06 | $14390595865.22           | $15977611972.24            | 54.9500%                  | 61.0100%                   |
| 2026-03-09 | $14084565179.34           | $15545012695.08            | 54.2700%                  | 59.8900%                   |
| 2026-03-10 | $14242659157.66           | $15703234141.31            | 54.5500%                  | 60.1400%                   |
| 2026-03-11 | $13793920901.08           | $15254619226.60            | 53.7500%                  | 59.4400%                   |
| 2026-03-12 | $14048482557.39           | $15384297433.44            | 54.4700%                  | 59.6400%                   |
| 2026-03-13 | $14596171722.33           | $15932084852.91            | 55.4000%                  | 60.4700%                   |
| 2026-03-16 | $14685707713.85           | $16272465576.56            | 55.1600%                  | 61.1200%                   |
| 2026-03-17 | $14524923883.40           | $16111834670.10            | 54.8900%                  | 60.8800%                   |
| 2026-03-18 | $14519419341.40           | $16106448261.58            | 54.8700%                  | 60.8700%                   |
| 2026-03-19 | $14701106144.76           | $16288276711.55            | 55.1800%                  | 61.1400%                   |
| 2026-03-20 | $13722228488.57           | $15309542688.39            | 53.4600%                  | 59.6400%                   |
| 2026-03-23 | $13667070929.38           | $15254795932.18            | 53.3600%                  | 59.5600%                   |
| 2026-03-24 | $14179476807.56           | $15639355196.36            | 54.5400%                  | 60.1500%                   |
| 2026-03-25 | $14230289412.56           | $15690303578.03            | 54.1400%                  | 59.7000%                   |
| 2026-03-26 | $14093420013.82           | $15418573741.23            | 54.1800%                  | 59.2700%                   |
| 2026-03-27 | $14360005746.68           | $15490316103.16            | 55.0400%                  | 59.3700%                   |
| 2026-03-30 | $13388783652.35           | $14731082999.01            | 53.3000%                  | 58.6500%                   |
| 2026-03-31 | $13283776010.59           | $14626209417.02            | 53.1200%                  | 58.4900%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2026-03-02 | 3.7300%             |
| 2026-03-03 | 3.7300%             |
| 2026-03-04 | 3.7300%             |
| 2026-03-05 | 3.7300%             |
| 2026-03-06 | 3.7200%             |
| 2026-03-09 | 3.7200%             |
| 2026-03-10 | 3.7200%             |
| 2026-03-11 | 3.7100%             |
| 2026-03-12 | 3.7100%             |
| 2026-03-13 | 3.7100%             |
| 2026-03-16 | 3.7100%             |
| 2026-03-17 | 3.7100%             |
| 2026-03-18 | 3.7100%             |
| 2026-03-19 | 3.7100%             |
| 2026-03-20 | 3.7000%             |
| 2026-03-23 | 3.7000%             |
| 2026-03-24 | 3.7000%             |
| 2026-03-25 | 3.7000%             |
| 2026-03-26 | 3.7000%             |
| 2026-03-27 | 3.7100%             |
| 2026-03-30 | 3.7100%             |
| 2026-03-31 | 3.7100%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2026-03-02 | 1.0000                      |
|  |  |
| 2026-03-03 | 1.0000                      |
|  |  |
| 2026-03-04 | 1.0000                      |
|  |  |
| 2026-03-05 | 1.0000                      |
|  |  |
| 2026-03-06 | 1.0000                      |
|  |  |
| 2026-03-09 | 1.0000                      |
|  |  |
| 2026-03-10 | 1.0000                      |
|  |  |
| 2026-03-11 | 1.0000                      |
|  |  |
| 2026-03-12 | 1.0000                      |
|  |  |
| 2026-03-13 | 1.0000                      |
|  |  |
| 2026-03-16 | 1.0000                      |
|  |  |
| 2026-03-17 | 1.0000                      |
|  |  |
| 2026-03-18 | 1.0000                      |
|  |  |
| 2026-03-19 | 1.0000                      |
|  |  |
| 2026-03-20 | 0.9999                      |
|  |  |
| 2026-03-23 | 1.0000                      |
|  |  |
| 2026-03-24 | 1.0000                      |
|  |  |
| 2026-03-25 | 1.0000                      |
|  |  |
| 2026-03-26 | 1.0000                      |
|  |  |
| 2026-03-27 | 0.9999                      |
|  |  |
| 2026-03-30 | 1.0000                      |
|  |  |
| 2026-03-31 | 1.0000                      |
|  |  |

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

### Class: Basis A

- **Minimum Initial Investment:** $50000000.00

- **Net Assets of Class:** $13272813171.30

- **Number of Shares Outstanding:** 13272473518.0100

- **Expense Reimbursement/Waiver:** 470425.00

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2026-03-02 | 1.0000          |
|  |  |
| 2026-03-03 | 1.0000          |
|  |  |
| 2026-03-04 | 1.0000          |
|  |  |
| 2026-03-05 | 1.0000          |
|  |  |
| 2026-03-06 | 1.0000          |
|  |  |
| 2026-03-09 | 1.0000          |
|  |  |
| 2026-03-10 | 1.0000          |
|  |  |
| 2026-03-11 | 1.0000          |
|  |  |
| 2026-03-12 | 1.0000          |
|  |  |
| 2026-03-13 | 1.0000          |
|  |  |
| 2026-03-16 | 1.0000          |
|  |  |
| 2026-03-17 | 1.0000          |
|  |  |
| 2026-03-18 | 1.0000          |
|  |  |
| 2026-03-19 | 1.0000          |
|  |  |
| 2026-03-20 | 0.9999          |
|  |  |
| 2026-03-23 | 1.0000          |
|  |  |
| 2026-03-24 | 1.0000          |
|  |  |
| 2026-03-25 | 1.0000          |
|  |  |
| 2026-03-26 | 1.0000          |
|  |  |
| 2026-03-27 | 0.9999          |
|  |  |
| 2026-03-30 | 1.0000          |
|  |  |
| 2026-03-31 | 1.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2026-03-02 | $549248518.61             | $93881370.17            |
| 2026-03-03 | $145178552.13             | $241758983.59           |
| 2026-03-04 | $82657507.93              | $88483481.93            |
| 2026-03-05 | $102842864.58             | $81599258.57            |
| 2026-03-06 | $102160428.83             | $189098610.15           |
| 2026-03-09 | $69952255.96              | $287443501.32           |
| 2026-03-10 | $318363305.22             | $284074312.51           |
| 2026-03-11 | $62639415.14              | $281540364.29           |
| 2026-03-12 | $113612834.76             | $38562072.81            |
| 2026-03-13 | $1414133240.28            | $729128386.38           |
| 2026-03-16 | $92580259.48              | $80264879.04            |
| 2026-03-17 | $77767501.39              | $37083886.41            |
| 2026-03-18 | $105592269.13             | $102154281.67           |
| 2026-03-19 | $27974876.19              | $135755014.39           |
| 2026-03-20 | $64861819.59              | $711248850.47           |
| 2026-03-23 | $35136414.84              | $189734401.75           |
| 2026-03-24 | $716259889.83             | $380377769.70           |
| 2026-03-25 | $128305350.43             | $96980239.25            |
| 2026-03-26 | $397452861.86             | $429907479.32           |
| 2026-03-27 | $47459752.60              | $71982252.05            |
| 2026-03-30 | $59256135.00              | $1157524932.05          |
| 2026-03-31 | $308181965.34             | $164862390.52           |

**Total Gross Subscriptions (Month):** $5021618019.12

**Total Gross Redemptions (Month):** $5873446718.34

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2026-03-02 | 3.5900%           |
| 2026-03-03 | 3.5900%           |
| 2026-03-04 | 3.5900%           |
| 2026-03-05 | 3.5900%           |
| 2026-03-06 | 3.5800%           |
| 2026-03-09 | 3.5800%           |
| 2026-03-10 | 3.5800%           |
| 2026-03-11 | 3.5700%           |
| 2026-03-12 | 3.5700%           |
| 2026-03-13 | 3.5700%           |
| 2026-03-16 | 3.5700%           |
| 2026-03-17 | 3.5700%           |
| 2026-03-18 | 3.5700%           |
| 2026-03-19 | 3.5700%           |
| 2026-03-20 | 3.5600%           |
| 2026-03-23 | 3.5600%           |
| 2026-03-24 | 3.5600%           |
| 2026-03-25 | 3.5600%           |
| 2026-03-26 | 3.5600%           |
| 2026-03-27 | 3.5700%           |
| 2026-03-30 | 3.5700%           |
| 2026-03-31 | 3.5700%           |

**Beneficial/Record Owner Categories**
| Category   | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Other      | IND FID AS EXEC  | 11.5200%         | 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):** $13315606522.74
- **C.18.a - Value (excl. sponsor support):** $13315606522.74
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2026-04-01
- **C.12 - Maturity Date (WAL):** 2026-04-01
- **C.13 - Final Legal Maturity Date:** 2026-04-01
- **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:** 2026-04-07

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

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

**Title of Signing Officer:** Vice President