# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-26-010493
**Filing Date:** 2026-2
**Character Count:** 13202
**Document Hash:** 237c48e477769561fda3b2b748e81ca1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-010493.hdr.sgml**: 20260206

**ACCESSION NUMBER**: 0001410368-26-010493

**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:** 26607318

**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 Treasury Institutional Fund (Series ID: S000002682)

| Class ID   | Class Name                             | Ticker Symbol   |
|:---|:---|:---|
| C000007334 | UBS Select Treasury Institutional Fund | SETXX           |

# 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 Treasury Institutional Fund

**LEI of Series:** 549300OA0OSRYE6ZYO90

**EDGAR Series Identifier:** S000002682

**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?:** Yes

- **WAM:** 1 days

- **WAL:** 1 days

- **Total Value of Portfolio Securities:** $18036874925.44

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $60584599.17

- **Net Assets of Series:** $17976290326.27

- **Number of Shares Outstanding (Series):** 17975821765.6700

- **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 | $42306659315.35           | $42306659315.35            | 99.7800%                  | 99.7800%                   |
| 2026-01-05 | $42978345042.61           | $42978345042.61            | 99.7900%                  | 99.7900%                   |
| 2026-01-06 | $43163040860.08           | $43163040860.08            | 99.8000%                  | 99.8000%                   |
| 2026-01-07 | $42954806907.63           | $42954806907.63            | 99.8100%                  | 99.8100%                   |
| 2026-01-08 | $42575800148.22           | $42575800148.22            | 99.8100%                  | 99.8100%                   |
| 2026-01-09 | $43222360453.85           | $43222360453.85            | 99.8000%                  | 99.8000%                   |
| 2026-01-12 | $43424210471.69           | $43424210471.69            | 99.8000%                  | 99.8000%                   |
| 2026-01-13 | $43013438553.02           | $43013438553.02            | 99.8000%                  | 99.8000%                   |
| 2026-01-14 | $43127090058.83           | $43127090058.83            | 99.8000%                  | 99.8000%                   |
| 2026-01-15 | $43218294961.97           | $43218294961.97            | 99.8100%                  | 99.8100%                   |
| 2026-01-16 | $43410777350.05           | $43410777350.05            | 99.7800%                  | 99.7800%                   |
| 2026-01-20 | $44127609292.29           | $44127609292.29            | 99.8100%                  | 99.8100%                   |
| 2026-01-21 | $44031816509.36           | $44031816509.36            | 99.8100%                  | 99.8100%                   |
| 2026-01-22 | $43495067693.08           | $43495067693.08            | 99.8100%                  | 99.8100%                   |
| 2026-01-23 | $44088677927.32           | $44088677927.32            | 99.8000%                  | 99.8000%                   |
| 2026-01-26 | $44491429263.75           | $44491429263.75            | 99.8100%                  | 99.8100%                   |
| 2026-01-27 | $44299191294.99           | $44299191294.99            | 99.8200%                  | 99.8200%                   |
| 2026-01-28 | $44379150280.05           | $44379150280.05            | 99.8200%                  | 99.8200%                   |
| 2026-01-29 | $43514944678.86           | $43514944678.86            | 99.8100%                  | 99.8100%                   |
| 2026-01-30 | $42690284250.90           | $42690284250.90            | 99.8000%                  | 99.8000%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2026-01-02 | 3.8300%             |
| 2026-01-05 | 3.8300%             |
| 2026-01-06 | 3.8200%             |
| 2026-01-07 | 3.8100%             |
| 2026-01-08 | 3.7900%             |
| 2026-01-09 | 3.7700%             |
| 2026-01-12 | 3.7700%             |
| 2026-01-13 | 3.7700%             |
| 2026-01-14 | 3.7600%             |
| 2026-01-15 | 3.7600%             |
| 2026-01-16 | 3.7600%             |
| 2026-01-20 | 3.7600%             |
| 2026-01-21 | 3.7600%             |
| 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 | 3.7500%             |
| 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 | 1.0002                      |
|  |  |
| 2026-01-12 | 1.0002                      |
|  |  |
| 2026-01-13 | 1.0002                      |
|  |  |
| 2026-01-14 | 1.0002                      |
|  |  |
| 2026-01-15 | 1.0002                      |
|  |  |
| 2026-01-16 | 1.0001                      |
|  |  |
| 2026-01-20 | 1.0002                      |
|  |  |
| 2026-01-21 | 1.0002                      |
|  |  |
| 2026-01-22 | 1.0001                      |
|  |  |
| 2026-01-23 | 1.0002                      |
|  |  |
| 2026-01-26 | 1.0002                      |
|  |  |
| 2026-01-27 | 1.0002                      |
|  |  |
| 2026-01-28 | 1.0001                      |
|  |  |
| 2026-01-29 | 1.0001                      |
|  |  |
| 2026-01-30 | 1.0002                      |
|  |  |

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

### Class: Single Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $17976290326.27

- **Number of Shares Outstanding:** 17975821765.6700

**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 | 1.0002          |
|  |  |
| 2026-01-12 | 1.0002          |
|  |  |
| 2026-01-13 | 1.0002          |
|  |  |
| 2026-01-14 | 1.0002          |
|  |  |
| 2026-01-15 | 1.0002          |
|  |  |
| 2026-01-16 | 1.0001          |
|  |  |
| 2026-01-20 | 1.0002          |
|  |  |
| 2026-01-21 | 1.0002          |
|  |  |
| 2026-01-22 | 1.0001          |
|  |  |
| 2026-01-23 | 1.0002          |
|  |  |
| 2026-01-26 | 1.0002          |
|  |  |
| 2026-01-27 | 1.0002          |
|  |  |
| 2026-01-28 | 1.0001          |
|  |  |
| 2026-01-29 | 1.0001          |
|  |  |
| 2026-01-30 | 1.0002          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2026-01-02 | $274164184.24             | $138859811.35           |
| 2026-01-05 | $306778114.62             | $138634956.38           |
| 2026-01-06 | $432501908.18             | $121747193.99           |
| 2026-01-07 | $241588520.48             | $118224026.53           |
| 2026-01-08 | $155438705.64             | $232026578.63           |
| 2026-01-09 | $202305402.79             | $218853540.09           |
| 2026-01-12 | $143596509.82             | $347757047.42           |
| 2026-01-13 | $105253101.99             | $197957487.61           |
| 2026-01-14 | $147174000.08             | $173291841.75           |
| 2026-01-15 | $144859458.58             | $272459613.83           |
| 2026-01-16 | $151465280.75             | $334856137.83           |
| 2026-01-20 | $390442831.99             | $170643373.31           |
| 2026-01-21 | $120122003.80             | $742744432.24           |
| 2026-01-22 | $179228773.69             | $96039205.54            |
| 2026-01-23 | $506920169.17             | $77630593.35            |
| 2026-01-26 | $132421624.82             | $493401878.46           |
| 2026-01-27 | $208663233.96             | $137852495.76           |
| 2026-01-28 | $83649781.16              | $382085287.34           |
| 2026-01-29 | $83839127.10              | $299502905.30           |
| 2026-01-30 | $172635956.81             | $275822762.28           |

**Total Gross Subscriptions (Month):** $4183048689.67

**Total Gross Redemptions (Month):** $4970391168.99

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2026-01-02 | 3.6500%           |
| 2026-01-05 | 3.6500%           |
| 2026-01-06 | 3.6400%           |
| 2026-01-07 | 3.6300%           |
| 2026-01-08 | 3.6200%           |
| 2026-01-09 | 3.5900%           |
| 2026-01-12 | 3.5900%           |
| 2026-01-13 | 3.5900%           |
| 2026-01-14 | 3.5900%           |
| 2026-01-15 | 3.5900%           |
| 2026-01-16 | 3.5800%           |
| 2026-01-20 | 3.5800%           |
| 2026-01-21 | 3.5800%           |
| 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: Treasury Master Fund

- **C.1 - Title:** Treasury Master Fund
- **C.6 - Investment Category:** Investment Company
- **Identifiers:** C.3 - CUSIP: 81699K911, C.3 - LEI: 549300XQ6V293JKF0677, C.5 - Other ID: 81699K911
- **C.18 - Value (incl. sponsor support):** $18036874925.44
- **C.18.a - Value (excl. sponsor support):** $18036874925.44
- **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