# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-26-034970
**Filing Date:** 2026-4
**Character Count:** 13929
**Document Hash:** 4414c2a243a8607b47f0fcf6467b9f09
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-034970.hdr.sgml**: 20260407

**ACCESSION NUMBER**: 0001410368-26-034970

**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:** 26843746

**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 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):** 2026-03-31

**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:** $9558340016.36

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $29009844.11

- **Net Assets of Series:** $9529330172.25

- **Number of Shares Outstanding (Series):** 9529128646.9600

- **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:** $1000000.00

- **Net Assets of Class:** $9529330172.25

- **Number of Shares Outstanding:** 9529128646.9600

**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 | $109455384.64             | $97943333.74            |
| 2026-03-03 | $93008272.24              | $59397806.37            |
| 2026-03-04 | $64265694.14              | $46035120.86            |
| 2026-03-05 | $61069870.36              | $71932153.44            |
| 2026-03-06 | $69125476.00              | $47943634.22            |
| 2026-03-09 | $50998872.40              | $86453917.87            |
| 2026-03-10 | $47149689.00              | $65909564.58            |
| 2026-03-11 | $68493731.82              | $54296222.41            |
| 2026-03-12 | $161440432.53             | $47278305.21            |
| 2026-03-13 | $122463801.76             | $201224048.21           |
| 2026-03-16 | $102256234.19             | $56192297.89            |
| 2026-03-17 | $53307712.82              | $55270795.48            |
| 2026-03-18 | $37966564.69              | $37417804.11            |
| 2026-03-19 | $162736306.25             | $76859092.42            |
| 2026-03-20 | $55126623.04              | $55356186.05            |
| 2026-03-23 | $96221280.88              | $121216392.46           |
| 2026-03-24 | $44849102.06              | $52802714.09            |
| 2026-03-25 | $42443832.53              | $91436897.82            |
| 2026-03-26 | $66875595.54              | $51022288.27            |
| 2026-03-27 | $56885187.24              | $46435368.25            |
| 2026-03-30 | $49491123.70              | $101904657.88           |
| 2026-03-31 | $53571420.60              | $114712652.47           |

**Total Gross Subscriptions (Month):** $1669202208.43

**Total Gross Redemptions (Month):** $1639041254.10

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2026-03-02 | 3.5500%           |
| 2026-03-03 | 3.5500%           |
| 2026-03-04 | 3.5500%           |
| 2026-03-05 | 3.5500%           |
| 2026-03-06 | 3.5400%           |
| 2026-03-09 | 3.5400%           |
| 2026-03-10 | 3.5400%           |
| 2026-03-11 | 3.5300%           |
| 2026-03-12 | 3.5300%           |
| 2026-03-13 | 3.5300%           |
| 2026-03-16 | 3.5300%           |
| 2026-03-17 | 3.5300%           |
| 2026-03-18 | 3.5300%           |
| 2026-03-19 | 3.5300%           |
| 2026-03-20 | 3.5200%           |
| 2026-03-23 | 3.5200%           |
| 2026-03-24 | 3.5200%           |
| 2026-03-25 | 3.5200%           |
| 2026-03-26 | 3.5200%           |
| 2026-03-27 | 3.5300%           |
| 2026-03-30 | 3.5300%           |
| 2026-03-31 | 3.5300%           |

## 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):** $9558340016.36
- **C.18.a - Value (excl. sponsor support):** $9558340016.36
- **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