# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-26-022295
**Filing Date:** 2026-3
**Character Count:** 12838
**Document Hash:** 2e776546a82280dbcf8d9ea2ad5d0e4e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-022295.hdr.sgml**: 20260306

**ACCESSION NUMBER**: 0001410368-26-022295

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260228

**FILED AS OF DATE**: 20260306

**DATE AS OF CHANGE**: 20260306

**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:** 26730213

**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):** 2026-02-28

**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:** $17518412251.65

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $50820246.87

- **Net Assets of Series:** $17467592004.78

- **Number of Shares Outstanding (Series):** 17466965628.9800

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2026-02-02 | $43297507991.10           | $43297507991.10            | 99.9400%                  | 99.9400%                   |
| 2026-02-03 | $43458449617.93           | $43458449617.93            | 99.9400%                  | 99.9400%                   |
| 2026-02-04 | $43648130274.48           | $43648130274.48            | 99.9300%                  | 99.9300%                   |
| 2026-02-05 | $42884902682.74           | $42884902682.74            | 99.9300%                  | 99.9300%                   |
| 2026-02-06 | $42777645340.30           | $42777645340.30            | 99.9200%                  | 99.9200%                   |
| 2026-02-09 | $42786572087.04           | $42786572087.04            | 99.9200%                  | 99.9200%                   |
| 2026-02-10 | $42640371940.86           | $42640371940.86            | 99.9200%                  | 99.9200%                   |
| 2026-02-11 | $43154725901.10           | $43154725901.10            | 99.9200%                  | 99.9200%                   |
| 2026-02-12 | $42492928407.43           | $42492928407.43            | 99.9200%                  | 99.9200%                   |
| 2026-02-13 | $43184813679.88           | $43184813679.88            | 99.9000%                  | 99.9000%                   |
| 2026-02-17 | $44233206419.01           | $44233206419.01            | 99.9100%                  | 99.9100%                   |
| 2026-02-18 | $44832106621.91           | $44832106621.91            | 99.9100%                  | 99.9100%                   |
| 2026-02-19 | $43435191725.06           | $43435191725.06            | 99.9100%                  | 99.9100%                   |
| 2026-02-20 | $43505799248.71           | $43505799248.71            | 99.8900%                  | 99.8900%                   |
| 2026-02-23 | $44297465091.67           | $44297465091.67            | 99.9000%                  | 99.9000%                   |
| 2026-02-24 | $43891988680.22           | $43891988680.22            | 99.9000%                  | 99.9000%                   |
| 2026-02-25 | $43822017172.07           | $43822017172.07            | 99.9000%                  | 99.9000%                   |
| 2026-02-26 | $42614475612.11           | $42614475612.11            | 99.8900%                  | 99.8900%                   |
| 2026-02-27 | $41937112663.61           | $41937112663.61            | 99.8800%                  | 99.8800%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2026-02-02 | 3.7500%             |
| 2026-02-03 | 3.7500%             |
| 2026-02-04 | 3.7500%             |
| 2026-02-05 | 3.7500%             |
| 2026-02-06 | 3.7400%             |
| 2026-02-09 | 3.7300%             |
| 2026-02-10 | 3.7300%             |
| 2026-02-11 | 3.7300%             |
| 2026-02-12 | 3.7300%             |
| 2026-02-13 | 3.7300%             |
| 2026-02-17 | 3.7400%             |
| 2026-02-18 | 3.7400%             |
| 2026-02-19 | 3.7400%             |
| 2026-02-20 | 3.7400%             |
| 2026-02-23 | 3.7400%             |
| 2026-02-24 | 3.7400%             |
| 2026-02-25 | 3.7300%             |
| 2026-02-26 | 3.7300%             |
| 2026-02-27 | 3.7400%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2026-02-02 | 1.0001                      |
|  |  |
| 2026-02-03 | 1.0002                      |
|  |  |
| 2026-02-04 | 1.0002                      |
|  |  |
| 2026-02-05 | 1.0002                      |
|  |  |
| 2026-02-06 | 1.0002                      |
|  |  |
| 2026-02-09 | 1.0002                      |
|  |  |
| 2026-02-10 | 1.0002                      |
|  |  |
| 2026-02-11 | 1.0001                      |
|  |  |
| 2026-02-12 | 1.0002                      |
|  |  |
| 2026-02-13 | 1.0002                      |
|  |  |
| 2026-02-17 | 1.0001                      |
|  |  |
| 2026-02-18 | 1.0001                      |
|  |  |
| 2026-02-19 | 1.0001                      |
|  |  |
| 2026-02-20 | 1.0001                      |
|  |  |
| 2026-02-23 | 1.0001                      |
|  |  |
| 2026-02-24 | 1.0001                      |
|  |  |
| 2026-02-25 | 1.0001                      |
|  |  |
| 2026-02-26 | 1.0001                      |
|  |  |
| 2026-02-27 | 1.0001                      |
|  |  |

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

### Class: Single Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $17467592004.78

- **Number of Shares Outstanding:** 17466965628.9800

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2026-02-02 | 1.0001          |
|  |  |
| 2026-02-03 | 1.0002          |
|  |  |
| 2026-02-04 | 1.0002          |
|  |  |
| 2026-02-05 | 1.0002          |
|  |  |
| 2026-02-06 | 1.0002          |
|  |  |
| 2026-02-09 | 1.0002          |
|  |  |
| 2026-02-10 | 1.0002          |
|  |  |
| 2026-02-11 | 1.0001          |
|  |  |
| 2026-02-12 | 1.0002          |
|  |  |
| 2026-02-13 | 1.0002          |
|  |  |
| 2026-02-17 | 1.0001          |
|  |  |
| 2026-02-18 | 1.0001          |
|  |  |
| 2026-02-19 | 1.0001          |
|  |  |
| 2026-02-20 | 1.0001          |
|  |  |
| 2026-02-23 | 1.0001          |
|  |  |
| 2026-02-24 | 1.0001          |
|  |  |
| 2026-02-25 | 1.0001          |
|  |  |
| 2026-02-26 | 1.0001          |
|  |  |
| 2026-02-27 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2026-02-02 | $559452774.82             | $121684138.94           |
| 2026-02-03 | $161054816.37             | $156064646.26           |
| 2026-02-04 | $97477064.03              | $465258864.32           |
| 2026-02-05 | $263587199.17             | $119797021.26           |
| 2026-02-06 | $135669006.78             | $64652510.59            |
| 2026-02-09 | $120854907.33             | $459747385.16           |
| 2026-02-10 | $120920456.38             | $228969706.72           |
| 2026-02-11 | $157310939.20             | $118177654.78           |
| 2026-02-12 | $83284638.23              | $127458674.26           |
| 2026-02-13 | $164889402.98             | $91241735.54            |
| 2026-02-17 | $297913803.97             | $114702563.14           |
| 2026-02-18 | $127561291.09             | $203596567.45           |
| 2026-02-19 | $117865715.41             | $148064593.55           |
| 2026-02-20 | $104529945.14             | $205106547.16           |
| 2026-02-23 | $136247689.11             | $111343086.10           |
| 2026-02-24 | $124453956.20             | $184339627.38           |
| 2026-02-25 | $77239950.43              | $475900180.30           |
| 2026-02-26 | $89782521.68              | $111726591.53           |
| 2026-02-27 | $231939142.47             | $173059263.04           |

**Total Gross Subscriptions (Month):** $3172035220.79

**Total Gross Redemptions (Month):** $3680891357.48

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2026-02-02 | 3.5700%           |
| 2026-02-03 | 3.5700%           |
| 2026-02-04 | 3.5700%           |
| 2026-02-05 | 3.5700%           |
| 2026-02-06 | 3.5600%           |
| 2026-02-09 | 3.5600%           |
| 2026-02-10 | 3.5500%           |
| 2026-02-11 | 3.5500%           |
| 2026-02-12 | 3.5500%           |
| 2026-02-13 | 3.5500%           |
| 2026-02-17 | 3.5600%           |
| 2026-02-18 | 3.5600%           |
| 2026-02-19 | 3.5600%           |
| 2026-02-20 | 3.5600%           |
| 2026-02-23 | 3.5600%           |
| 2026-02-24 | 3.5600%           |
| 2026-02-25 | 3.5500%           |
| 2026-02-26 | 3.5500%           |
| 2026-02-27 | 3.5600%           |

## 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):** $17518412251.65
- **C.18.a - Value (excl. sponsor support):** $17518412251.65
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2026-03-02
- **C.12 - Maturity Date (WAL):** 2026-03-02
- **C.13 - Final Legal Maturity Date:** 2026-03-02
- **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:** 2026-03-06

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

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

**Title of Signing Officer:** Vice President