# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-26-010499
**Filing Date:** 2026-2
**Character Count:** 13201
**Document Hash:** df96e287a6c2e5870c20b26ccc97e996
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-010499.hdr.sgml**: 20260206

**ACCESSION NUMBER**: 0001410368-26-010499

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260131

**FILED AS OF DATE**: 20260206

**DATE AS OF CHANGE**: 20260206

**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:** 26607334

**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):** 2026-01-31

**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:** $9866820218.30

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $31511654.25

- **Net Assets of Series:** $9835308564.05

- **Number of Shares Outstanding (Series):** 9835175938.0300

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2026-01-02 | $20822963370.42           | $22639899168.89            | 75.2300%                  | 81.8000%                   |
| 2026-01-05 | $20920341424.67           | $22615767784.82            | 75.6500%                  | 81.7800%                   |
| 2026-01-06 | $21089699474.50           | $22785314625.08            | 75.8100%                  | 81.9000%                   |
| 2026-01-07 | $21586190047.72           | $23281951246.18            | 75.3400%                  | 81.2600%                   |
| 2026-01-08 | $20651976862.55           | $22347878736.99            | 73.6500%                  | 79.7000%                   |
| 2026-01-09 | $20190606463.99           | $21886632051.37            | 72.5400%                  | 78.6300%                   |
| 2026-01-12 | $20143472043.55           | $21964218929.83            | 70.9600%                  | 77.3800%                   |
| 2026-01-13 | $20316936107.66           | $22137837706.56            | 70.8000%                  | 77.1500%                   |
| 2026-01-14 | $19755746468.08           | $21576807390.54            | 69.8700%                  | 76.3100%                   |
| 2026-01-15 | $19286860801.36           | $20984088629.46            | 69.0600%                  | 75.1400%                   |
| 2026-01-16 | $18783477778.33           | $20613813099.14            | 68.4800%                  | 75.1500%                   |
| 2026-01-20 | $19613870520.68           | $21444781242.31            | 68.7600%                  | 75.1800%                   |
| 2026-01-21 | $19119418881.78           | $20827478042.57            | 67.6700%                  | 73.7100%                   |
| 2026-01-22 | $18665352770.02           | $20245568701.78            | 66.7800%                  | 72.4300%                   |
| 2026-01-23 | $18712215038.86           | $20159559255.92            | 66.8300%                  | 72.0000%                   |
| 2026-01-26 | $18874573396.65           | $20583737615.92            | 66.3900%                  | 72.4000%                   |
| 2026-01-27 | $18334559278.50           | $19798906434.99            | 65.7100%                  | 70.9600%                   |
| 2026-01-28 | $17973970377.83           | $19438458795.05            | 65.2700%                  | 70.5900%                   |
| 2026-01-29 | $17994021465.39           | $19400452907.05            | 65.4900%                  | 70.6100%                   |
| 2026-01-30 | $18384508837.25           | $19791119779.31            | 65.9700%                  | 71.0100%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2026-01-02 | 3.8500%             |
| 2026-01-05 | 3.8400%             |
| 2026-01-06 | 3.8400%             |
| 2026-01-07 | 3.8200%             |
| 2026-01-08 | 3.8100%             |
| 2026-01-09 | 3.7800%             |
| 2026-01-12 | 3.7700%             |
| 2026-01-13 | 3.7700%             |
| 2026-01-14 | 3.7700%             |
| 2026-01-15 | 3.7700%             |
| 2026-01-16 | 3.7700%             |
| 2026-01-20 | 3.7700%             |
| 2026-01-21 | 3.7700%             |
| 2026-01-22 | 3.7600%             |
| 2026-01-23 | 3.7600%             |
| 2026-01-26 | 3.7600%             |
| 2026-01-27 | 3.7600%             |
| 2026-01-28 | 3.7600%             |
| 2026-01-29 | 3.7600%             |
| 2026-01-30 | 3.7600%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2026-01-02 | 1.0002                      |
|  |  |
| 2026-01-05 | 1.0002                      |
|  |  |
| 2026-01-06 | 1.0002                      |
|  |  |
| 2026-01-07 | 1.0002                      |
|  |  |
| 2026-01-08 | 1.0002                      |
|  |  |
| 2026-01-09 | 1.0001                      |
|  |  |
| 2026-01-12 | 1.0002                      |
|  |  |
| 2026-01-13 | 1.0002                      |
|  |  |
| 2026-01-14 | 1.0001                      |
|  |  |
| 2026-01-15 | 1.0001                      |
|  |  |
| 2026-01-16 | 1.0001                      |
|  |  |
| 2026-01-20 | 1.0001                      |
|  |  |
| 2026-01-21 | 1.0001                      |
|  |  |
| 2026-01-22 | 1.0001                      |
|  |  |
| 2026-01-23 | 1.0001                      |
|  |  |
| 2026-01-26 | 1.0001                      |
|  |  |
| 2026-01-27 | 1.0001                      |
|  |  |
| 2026-01-28 | 1.0001                      |
|  |  |
| 2026-01-29 | 1.0001                      |
|  |  |
| 2026-01-30 | 1.0001                      |
|  |  |

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

### Class: Basis A

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $9835308564.05

- **Number of Shares Outstanding:** 9835175938.0300

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2026-01-02 | 1.0002          |
|  |  |
| 2026-01-05 | 1.0002          |
|  |  |
| 2026-01-06 | 1.0002          |
|  |  |
| 2026-01-07 | 1.0002          |
|  |  |
| 2026-01-08 | 1.0002          |
|  |  |
| 2026-01-09 | 1.0001          |
|  |  |
| 2026-01-12 | 1.0002          |
|  |  |
| 2026-01-13 | 1.0002          |
|  |  |
| 2026-01-14 | 1.0001          |
|  |  |
| 2026-01-15 | 1.0001          |
|  |  |
| 2026-01-16 | 1.0001          |
|  |  |
| 2026-01-20 | 1.0001          |
|  |  |
| 2026-01-21 | 1.0001          |
|  |  |
| 2026-01-22 | 1.0001          |
|  |  |
| 2026-01-23 | 1.0001          |
|  |  |
| 2026-01-26 | 1.0001          |
|  |  |
| 2026-01-27 | 1.0001          |
|  |  |
| 2026-01-28 | 1.0001          |
|  |  |
| 2026-01-29 | 1.0001          |
|  |  |
| 2026-01-30 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2026-01-02 | $227278385.03             | $89512215.82            |
| 2026-01-05 | $73025708.36              | $107013949.54           |
| 2026-01-06 | $69171071.76              | $62255653.52            |
| 2026-01-07 | $154898232.66             | $52107701.59            |
| 2026-01-08 | $75461206.21              | $133985332.26           |
| 2026-01-09 | $98449197.13              | $52047461.15            |
| 2026-01-12 | $77519728.34              | $204217852.09           |
| 2026-01-13 | $91639444.42              | $269426759.64           |
| 2026-01-14 | $112557058.64             | $125900065.52           |
| 2026-01-15 | $70449144.54              | $117158717.22           |
| 2026-01-16 | $101701623.51             | $58893085.31            |
| 2026-01-20 | $71799161.09              | $111919555.70           |
| 2026-01-21 | $83510103.65              | $69256138.36            |
| 2026-01-22 | $114526794.49             | $83110396.53            |
| 2026-01-23 | $90301161.76              | $69749060.99            |
| 2026-01-26 | $172674265.43             | $80224220.13            |
| 2026-01-27 | $44384252.97              | $65552323.12            |
| 2026-01-28 | $100104021.78             | $72042205.39            |
| 2026-01-29 | $145062088.23             | $120102858.61           |
| 2026-01-30 | $125059740.22             | $68588732.65            |

**Total Gross Subscriptions (Month):** $2099572390.22

**Total Gross Redemptions (Month):** $2013064285.14

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2026-01-02 | 3.6700%           |
| 2026-01-05 | 3.6600%           |
| 2026-01-06 | 3.6600%           |
| 2026-01-07 | 3.6400%           |
| 2026-01-08 | 3.6300%           |
| 2026-01-09 | 3.6000%           |
| 2026-01-12 | 3.5900%           |
| 2026-01-13 | 3.5900%           |
| 2026-01-14 | 3.5900%           |
| 2026-01-15 | 3.5900%           |
| 2026-01-16 | 3.5900%           |
| 2026-01-20 | 3.5900%           |
| 2026-01-21 | 3.5900%           |
| 2026-01-22 | 3.5800%           |
| 2026-01-23 | 3.5800%           |
| 2026-01-26 | 3.5800%           |
| 2026-01-27 | 3.5800%           |
| 2026-01-28 | 3.5800%           |
| 2026-01-29 | 3.5800%           |
| 2026-01-30 | 3.5800%           |

## 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):** $9866820218.30
- **C.18.a - Value (excl. sponsor support):** $9866820218.30
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2026-02-02
- **C.12 - Maturity Date (WAL):** 2026-02-02
- **C.13 - Final Legal Maturity Date:** 2026-02-02
- **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:** 2026-02-06

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

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

**Title of Signing Officer:** Vice President