# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-25-021476
**Filing Date:** 2025-11
**Character Count:** 14506
**Document Hash:** bc1dcb9c4ffb6d7aaca615b95071fcd4
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-021476.hdr.sgml**: 20251107

**ACCESSION NUMBER**: 0001410368-25-021476

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251031

**FILED AS OF DATE**: 20251107

**DATE AS OF CHANGE**: 20251107

**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:** 251461872

**BUSINESS ADDRESS:**
- **STREET 1:** C/O UBS ASSET MANAGEMENT (AMERICAS) LLC
- **STREET 2:** 787 SEVENTH AVENUE
- **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:** 787 SEVENTH AVENUE
- **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):** 2025-10-31

**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:** $19089901965.33

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $70001395.74

- **Net Assets of Series:** $19019900569.59

- **Number of Shares Outstanding (Series):** 19019799104.0200

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-10-01 | $46310921832.51           | $47310921832.51            | 97.7000%                  | 99.8100%                   |
| 2025-10-02 | $45381244069.93           | $46381244069.93            | 97.6500%                  | 99.8000%                   |
| 2025-10-03 | $45331470985.26           | $46331470985.26            | 97.6300%                  | 99.7900%                   |
| 2025-10-06 | $46008160460.36           | $47008160460.36            | 97.6700%                  | 99.8000%                   |
| 2025-10-07 | $45594444987.94           | $46594444987.94            | 97.6500%                  | 99.7900%                   |
| 2025-10-08 | $45645845533.08           | $46645845533.08            | 97.6500%                  | 99.7900%                   |
| 2025-10-09 | $44831365176.64           | $45831365176.64            | 97.6100%                  | 99.7800%                   |
| 2025-10-10 | $44279340685.50           | $45279340685.50            | 97.5500%                  | 99.7600%                   |
| 2025-10-13 | $0.00                     | $0.00                      | 0.0000%                   | 0.0000%                    |
| 2025-10-14 | $43727683983.79           | $44727683983.79            | 97.5300%                  | 99.7600%                   |
| 2025-10-15 | $44035874208.19           | $45035874208.19            | 97.5600%                  | 99.7700%                   |
| 2025-10-16 | $44422826071.61           | $45422826071.61            | 97.5700%                  | 99.7700%                   |
| 2025-10-17 | $43872421718.52           | $44872421718.52            | 97.5300%                  | 99.7500%                   |
| 2025-10-20 | $43317116973.52           | $44317116973.52            | 97.5000%                  | 99.7500%                   |
| 2025-10-21 | $42606387305.68           | $43606387305.68            | 97.4600%                  | 99.7500%                   |
| 2025-10-22 | $42227842151.71           | $43227842151.71            | 97.4300%                  | 99.7400%                   |
| 2025-10-23 | $41401841699.10           | $42401841699.10            | 97.3800%                  | 99.7300%                   |
| 2025-10-24 | $41173954363.52           | $42173954363.52            | 97.3500%                  | 99.7100%                   |
| 2025-10-27 | $41432061387.77           | $42432061387.77            | 97.3700%                  | 99.7200%                   |
| 2025-10-28 | $41311306235.81           | $42311306235.81            | 97.3600%                  | 99.7200%                   |
| 2025-10-29 | $42758334829.59           | $42758334829.59            | 99.7200%                  | 99.7200%                   |
| 2025-10-30 | $41343449966.00           | $42343449966.00            | 97.3700%                  | 99.7200%                   |
| 2025-10-31 | $41233391114.63           | $42233391114.63            | 97.5800%                  | 99.9400%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-10-01 | 4.1800%             |
| 2025-10-02 | 4.1800%             |
| 2025-10-03 | 4.1800%             |
| 2025-10-06 | 4.1700%             |
| 2025-10-07 | 4.1700%             |
| 2025-10-08 | 4.1600%             |
| 2025-10-09 | 4.1600%             |
| 2025-10-10 | 4.1500%             |
| 2025-10-13 | 0.0000%             |
| 2025-10-14 | 4.1500%             |
| 2025-10-15 | 4.1500%             |
| 2025-10-16 | 4.1600%             |
| 2025-10-17 | 4.1700%             |
| 2025-10-20 | 4.1700%             |
| 2025-10-21 | 4.1600%             |
| 2025-10-22 | 4.1600%             |
| 2025-10-23 | 4.1500%             |
| 2025-10-24 | 4.1500%             |
| 2025-10-27 | 4.1500%             |
| 2025-10-28 | 4.1500%             |
| 2025-10-29 | 4.1500%             |
| 2025-10-30 | 4.1400%             |
| 2025-10-31 | 4.1200%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-10-01 | 1.0002                      |
|  |  |
| 2025-10-02 | 1.0002                      |
|  |  |
| 2025-10-03 | 1.0001                      |
|  |  |
| 2025-10-06 | 1.0001                      |
|  |  |
| 2025-10-07 | 1.0001                      |
|  |  |
| 2025-10-08 | 1.0001                      |
|  |  |
| 2025-10-09 | 1.0001                      |
|  |  |
| 2025-10-10 | 1.0001                      |
|  |  |
| 2025-10-13 | 0.0000                      |
|  |  |
| 2025-10-14 | 1.0001                      |
|  |  |
| 2025-10-15 | 1.0001                      |
|  |  |
| 2025-10-16 | 1.0001                      |
|  |  |
| 2025-10-17 | 1.0001                      |
|  |  |
| 2025-10-20 | 1.0001                      |
|  |  |
| 2025-10-21 | 1.0001                      |
|  |  |
| 2025-10-22 | 1.0001                      |
|  |  |
| 2025-10-23 | 1.0001                      |
|  |  |
| 2025-10-24 | 1.0001                      |
|  |  |
| 2025-10-27 | 1.0002                      |
|  |  |
| 2025-10-28 | 1.0002                      |
|  |  |
| 2025-10-29 | 1.0001                      |
|  |  |
| 2025-10-30 | 1.0001                      |
|  |  |
| 2025-10-31 | 1.0001                      |
|  |  |

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

### Class: Single Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $19019900569.59

- **Number of Shares Outstanding:** 19019799104.0200

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-10-01 | 1.0002          |
|  |  |
| 2025-10-02 | 1.0002          |
|  |  |
| 2025-10-03 | 1.0001          |
|  |  |
| 2025-10-06 | 1.0001          |
|  |  |
| 2025-10-07 | 1.0001          |
|  |  |
| 2025-10-08 | 1.0001          |
|  |  |
| 2025-10-09 | 1.0001          |
|  |  |
| 2025-10-10 | 1.0001          |
|  |  |
| 2025-10-13 | 0.0000          |
|  |  |
| 2025-10-14 | 1.0001          |
|  |  |
| 2025-10-15 | 1.0001          |
|  |  |
| 2025-10-16 | 1.0001          |
|  |  |
| 2025-10-17 | 1.0001          |
|  |  |
| 2025-10-20 | 1.0001          |
|  |  |
| 2025-10-21 | 1.0001          |
|  |  |
| 2025-10-22 | 1.0001          |
|  |  |
| 2025-10-23 | 1.0001          |
|  |  |
| 2025-10-24 | 1.0001          |
|  |  |
| 2025-10-27 | 1.0002          |
|  |  |
| 2025-10-28 | 1.0002          |
|  |  |
| 2025-10-29 | 1.0001          |
|  |  |
| 2025-10-30 | 1.0001          |
|  |  |
| 2025-10-31 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-10-01 | $670031330.27             | $166425934.92           |
| 2025-10-02 | $114077815.30             | $97386806.50            |
| 2025-10-03 | $137417702.55             | $250296260.14           |
| 2025-10-06 | $117477424.28             | $108490762.41           |
| 2025-10-07 | $67305637.62              | $220867000.35           |
| 2025-10-08 | $142487198.09             | $113967993.70           |
| 2025-10-09 | $208891282.94             | $120819579.99           |
| 2025-10-10 | $105973743.53             | $185547604.36           |
| 2025-10-13 | $0.00                     | $0.00                   |
| 2025-10-14 | $198009130.58             | $225969374.73           |
| 2025-10-15 | $161565477.24             | $184470667.63           |
| 2025-10-16 | $130039225.41             | $83146795.16            |
| 2025-10-17 | $87368281.80              | $116337400.50           |
| 2025-10-20 | $91806008.24              | $196903589.42           |
| 2025-10-21 | $174016928.63             | $82419780.28            |
| 2025-10-22 | $82679013.85              | $130220149.23           |
| 2025-10-23 | $81367513.41              | $162100979.87           |
| 2025-10-24 | $113282743.57             | $191065660.87           |
| 2025-10-27 | $71993388.28              | $156130792.06           |
| 2025-10-28 | $387740631.80             | $206371636.68           |
| 2025-10-29 | $61944143.37              | $608371636.65           |
| 2025-10-30 | $478143919.88             | $224639290.59           |
| 2025-10-31 | $444037871.13             | $133522993.63           |

**Total Gross Subscriptions (Month):** $4127656411.77

**Total Gross Redemptions (Month):** $3965472689.67

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-10-01 | 4.0100%           |
| 2025-10-02 | 4.0000%           |
| 2025-10-03 | 4.0000%           |
| 2025-10-06 | 4.0000%           |
| 2025-10-07 | 3.9900%           |
| 2025-10-08 | 3.9800%           |
| 2025-10-09 | 3.9800%           |
| 2025-10-10 | 3.9700%           |
| 2025-10-13 | 0.0000%           |
| 2025-10-14 | 3.9700%           |
| 2025-10-15 | 3.9700%           |
| 2025-10-16 | 3.9800%           |
| 2025-10-17 | 3.9900%           |
| 2025-10-20 | 3.9900%           |
| 2025-10-21 | 3.9900%           |
| 2025-10-22 | 3.9800%           |
| 2025-10-23 | 3.9700%           |
| 2025-10-24 | 3.9700%           |
| 2025-10-27 | 3.9800%           |
| 2025-10-28 | 3.9700%           |
| 2025-10-29 | 3.9700%           |
| 2025-10-30 | 3.9600%           |
| 2025-10-31 | 3.9400%           |

**Beneficial/Record Owner Categories**
| Category                  | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Non-financial corporation |  | 6.2700%          | 0.0000%              |

## 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):** $19089901965.33
- **C.18.a - Value (excl. sponsor support):** $19089901965.33
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-11-03
- **C.12 - Maturity Date (WAL):** 2025-11-03
- **C.13 - Final Legal Maturity Date:** 2025-11-03
- **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:** 2025-11-07

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

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

**Title of Signing Officer:** Vice President