# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-25-033522
**Filing Date:** 2025-12
**Character Count:** 13050
**Document Hash:** b34127a72b3e096511b2870752e6f4fc
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-25-033522.hdr.sgml**: 20251205

**ACCESSION NUMBER**: 0001410368-25-033522

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251130

**FILED AS OF DATE**: 20251205

**DATE AS OF CHANGE**: 20251205

**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:** 251552577

**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):** 2025-11-30

**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:** $18603216022.90

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $61341070.67

- **Net Assets of Series:** $18541874952.23

- **Number of Shares Outstanding (Series):** 18541773486.6600

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-11-03 | $42132863312.47           | $43132863312.47            | 97.6300%                  | 99.9500%                   |
| 2025-11-04 | $41047220143.78           | $42047220143.78            | 97.5700%                  | 99.9400%                   |
| 2025-11-05 | $41741198213.88           | $42741198213.88            | 97.6000%                  | 99.9400%                   |
| 2025-11-06 | $41248497113.49           | $42248497113.49            | 97.5700%                  | 99.9400%                   |
| 2025-11-07 | $41471322586.23           | $42471322586.23            | 97.5700%                  | 99.9200%                   |
| 2025-11-10 | $42177665611.09           | $43177665611.09            | 97.6100%                  | 99.9200%                   |
| 2025-11-11 | $0.00                     | $0.00                      | 0.0000%                   | 0.0000%                    |
| 2025-11-12 | $42245468922.72           | $43245468922.72            | 97.6100%                  | 99.9200%                   |
| 2025-11-13 | $41371050929.68           | $42371050929.68            | 97.5600%                  | 99.9200%                   |
| 2025-11-14 | $41448903386.51           | $42448903386.51            | 97.5500%                  | 99.9000%                   |
| 2025-11-17 | $41214606979.86           | $42214606979.86            | 97.5500%                  | 99.9100%                   |
| 2025-11-18 | $41328421470.95           | $42328421470.95            | 97.5500%                  | 99.9100%                   |
| 2025-11-19 | $41298903057.75           | $42298903057.75            | 97.5500%                  | 99.9100%                   |
| 2025-11-20 | $40626005568.10           | $41626005568.10            | 97.5000%                  | 99.9000%                   |
| 2025-11-21 | $40747653615.01           | $41747653615.01            | 97.4900%                  | 99.8900%                   |
| 2025-11-24 | $41713005126.58           | $42713005126.58            | 97.5500%                  | 99.8900%                   |
| 2025-11-25 | $41613839897.73           | $42613839897.73            | 97.5500%                  | 99.8900%                   |
| 2025-11-26 | $41661111576.75           | $42661111576.75            | 97.5400%                  | 99.8800%                   |
| 2025-11-28 | $41086575999.82           | $42086575999.82            | 97.4900%                  | 99.8700%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-11-03 | 4.1100%             |
| 2025-11-04 | 4.0900%             |
| 2025-11-05 | 4.0800%             |
| 2025-11-06 | 4.0700%             |
| 2025-11-07 | 4.0300%             |
| 2025-11-10 | 4.0200%             |
| 2025-11-11 | 0.0000%             |
| 2025-11-12 | 4.0200%             |
| 2025-11-13 | 4.0300%             |
| 2025-11-14 | 4.0200%             |
| 2025-11-17 | 4.0200%             |
| 2025-11-18 | 4.0200%             |
| 2025-11-19 | 4.0200%             |
| 2025-11-20 | 4.0100%             |
| 2025-11-21 | 4.0100%             |
| 2025-11-24 | 4.0000%             |
| 2025-11-25 | 4.0000%             |
| 2025-11-26 | 4.0100%             |
| 2025-11-28 | 4.0300%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-11-03 | 1.0001                      |
|  |  |
| 2025-11-04 | 1.0001                      |
|  |  |
| 2025-11-05 | 1.0001                      |
|  |  |
| 2025-11-06 | 1.0002                      |
|  |  |
| 2025-11-07 | 1.0001                      |
|  |  |
| 2025-11-10 | 1.0001                      |
|  |  |
| 2025-11-11 | 0.0000                      |
|  |  |
| 2025-11-12 | 1.0001                      |
|  |  |
| 2025-11-13 | 1.0001                      |
|  |  |
| 2025-11-14 | 1.0001                      |
|  |  |
| 2025-11-17 | 1.0001                      |
|  |  |
| 2025-11-18 | 1.0001                      |
|  |  |
| 2025-11-19 | 1.0001                      |
|  |  |
| 2025-11-20 | 1.0001                      |
|  |  |
| 2025-11-21 | 1.0001                      |
|  |  |
| 2025-11-24 | 1.0001                      |
|  |  |
| 2025-11-25 | 1.0001                      |
|  |  |
| 2025-11-26 | 1.0001                      |
|  |  |
| 2025-11-28 | 1.0001                      |
|  |  |

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

### Class: Single Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $18541874952.23

- **Number of Shares Outstanding:** 18541773486.6600

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-11-03 | 1.0001          |
|  |  |
| 2025-11-04 | 1.0001          |
|  |  |
| 2025-11-05 | 1.0001          |
|  |  |
| 2025-11-06 | 1.0002          |
|  |  |
| 2025-11-07 | 1.0001          |
|  |  |
| 2025-11-10 | 1.0001          |
|  |  |
| 2025-11-11 | 0.0000          |
|  |  |
| 2025-11-12 | 1.0001          |
|  |  |
| 2025-11-13 | 1.0001          |
|  |  |
| 2025-11-14 | 1.0001          |
|  |  |
| 2025-11-17 | 1.0001          |
|  |  |
| 2025-11-18 | 1.0001          |
|  |  |
| 2025-11-19 | 1.0001          |
|  |  |
| 2025-11-20 | 1.0001          |
|  |  |
| 2025-11-21 | 1.0001          |
|  |  |
| 2025-11-24 | 1.0001          |
|  |  |
| 2025-11-25 | 1.0001          |
|  |  |
| 2025-11-26 | 1.0001          |
|  |  |
| 2025-11-28 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-11-03 | $682136500.77             | $145698128.17           |
| 2025-11-04 | $108173351.78             | $586100272.88           |
| 2025-11-05 | $245558874.07             | $94915318.92            |
| 2025-11-06 | $96582087.99              | $182532978.30           |
| 2025-11-07 | $125462037.52             | $274453660.43           |
| 2025-11-10 | $103672606.67             | $93477531.15            |
| 2025-11-11 | $0.00                     | $0.00                   |
| 2025-11-12 | $124264188.30             | $235709680.59           |
| 2025-11-13 | $127083173.84             | $111159729.39           |
| 2025-11-14 | $196987260.82             | $171548148.35           |
| 2025-11-17 | $73521448.80              | $227704468.13           |
| 2025-11-18 | $102360137.11             | $151116067.28           |
| 2025-11-19 | $82572798.18              | $167020251.55           |
| 2025-11-20 | $89625475.60              | $125016868.82           |
| 2025-11-21 | $149859630.05             | $115423339.52           |
| 2025-11-24 | $92619404.29              | $120355842.12           |
| 2025-11-25 | $137793996.54             | $193524870.48           |
| 2025-11-26 | $182380408.84             | $91992793.34            |
| 2025-11-28 | $61221462.09              | $172150511.20           |

**Total Gross Subscriptions (Month):** $2781874843.26

**Total Gross Redemptions (Month):** $3259900460.62

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-11-03 | 3.9300%           |
| 2025-11-04 | 3.9100%           |
| 2025-11-05 | 3.9000%           |
| 2025-11-06 | 3.8900%           |
| 2025-11-07 | 3.8500%           |
| 2025-11-10 | 3.8500%           |
| 2025-11-11 | 0.0000%           |
| 2025-11-12 | 3.8400%           |
| 2025-11-13 | 3.8500%           |
| 2025-11-14 | 3.8400%           |
| 2025-11-17 | 3.8400%           |
| 2025-11-18 | 3.8400%           |
| 2025-11-19 | 3.8400%           |
| 2025-11-20 | 3.8300%           |
| 2025-11-21 | 3.8300%           |
| 2025-11-24 | 3.8200%           |
| 2025-11-25 | 3.8300%           |
| 2025-11-26 | 3.8400%           |
| 2025-11-28 | 3.8500%           |

**Beneficial/Record Owner Categories**
| Category                  | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Non-financial corporation |  | 6.2100%          | 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):** $18603216022.90
- **C.18.a - Value (excl. sponsor support):** $18603216022.90
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-12-01
- **C.12 - Maturity Date (WAL):** 2025-12-01
- **C.13 - Final Legal Maturity Date:** 2025-12-01
- **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:** 2025-12-05

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

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

**Title of Signing Officer:** Vice President