# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001145549-25-050835
**Filing Date:** 2025-8
**Character Count:** 14142
**Document Hash:** 397e125af00b497c3930d523ed91687b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-25-050835.hdr.sgml**: 20250807

**ACCESSION NUMBER**: 0001145549-25-050835

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250731

**FILED AS OF DATE**: 20250807

**DATE AS OF CHANGE**: 20250807

**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:** 251193137

**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):** 2025-07-31

**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:** $18964864618.52

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $68459746.73

- **Net Assets of Series:** $18896404871.79

- **Number of Shares Outstanding (Series):** 18896303406.2200

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2025-07-01 | $44115383982.40           | $45115383982.40            | 97.5800%                  | 99.7900%                   |
| 2025-07-02 | $44405119863.46           | $45405119863.46            | 97.5900%                  | 99.7900%                   |
| 2025-07-03 | $44116639754.62           | $45116639754.62            | 97.5400%                  | 99.7500%                   |
| 2025-07-07 | $45116179808.08           | $46116179808.08            | 97.6100%                  | 99.7800%                   |
| 2025-07-08 | $45762435994.10           | $46762435994.10            | 97.6400%                  | 99.7800%                   |
| 2025-07-09 | $46287391774.36           | $47287391774.36            | 97.6700%                  | 99.7800%                   |
| 2025-07-10 | $45100181304.33           | $46100181304.33            | 97.6000%                  | 99.7700%                   |
| 2025-07-11 | $45910015325.37           | $46910015325.37            | 97.6200%                  | 99.7500%                   |
| 2025-07-14 | $47371677154.17           | $48371677154.17            | 97.7100%                  | 99.7700%                   |
| 2025-07-15 | $46167400164.72           | $47167400164.72            | 97.6500%                  | 99.7700%                   |
| 2025-07-16 | $46691626658.12           | $47691626658.12            | 97.6800%                  | 99.7700%                   |
| 2025-07-17 | $44806366501.05           | $45806366501.05            | 97.5800%                  | 99.7600%                   |
| 2025-07-18 | $44175246197.75           | $45175246197.75            | 97.5200%                  | 99.7300%                   |
| 2025-07-21 | $44438033666.86           | $45438033666.86            | 97.5500%                  | 99.7400%                   |
| 2025-07-22 | $43993932532.22           | $44993932532.22            | 97.5200%                  | 99.7400%                   |
| 2025-07-23 | $44089006146.70           | $45089006146.70            | 97.5200%                  | 99.7300%                   |
| 2025-07-24 | $42805508062.63           | $43805508062.63            | 97.4500%                  | 99.7200%                   |
| 2025-07-25 | $43736932395.15           | $44736932395.15            | 97.4800%                  | 99.7100%                   |
| 2025-07-28 | $44790970142.13           | $45790970142.13            | 97.5500%                  | 99.7200%                   |
| 2025-07-29 | $43882618462.32           | $44882618462.32            | 97.4900%                  | 99.7200%                   |
| 2025-07-30 | $46215333539.53           | $46215333539.53            | 99.7200%                  | 99.7200%                   |
| 2025-07-31 | $42731477074.53           | $43731477074.53            | 97.6500%                  | 99.9400%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2025-07-01 | 4.4000%             |
| 2025-07-02 | 4.4000%             |
| 2025-07-03 | 4.3800%             |
| 2025-07-07 | 4.3700%             |
| 2025-07-08 | 4.3700%             |
| 2025-07-09 | 4.3700%             |
| 2025-07-10 | 4.3700%             |
| 2025-07-11 | 4.3700%             |
| 2025-07-14 | 4.3700%             |
| 2025-07-15 | 4.3700%             |
| 2025-07-16 | 4.3700%             |
| 2025-07-17 | 4.3700%             |
| 2025-07-18 | 4.3700%             |
| 2025-07-21 | 4.3600%             |
| 2025-07-22 | 4.3600%             |
| 2025-07-23 | 4.3500%             |
| 2025-07-24 | 4.3500%             |
| 2025-07-25 | 4.3700%             |
| 2025-07-28 | 4.3700%             |
| 2025-07-29 | 4.3800%             |
| 2025-07-30 | 4.3800%             |
| 2025-07-31 | 4.3900%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2025-07-01 | 1.0001                      |
|  |  |
| 2025-07-02 | 1.0001                      |
|  |  |
| 2025-07-03 | 1.0000                      |
|  |  |
| 2025-07-07 | 1.0000                      |
|  |  |
| 2025-07-08 | 1.0001                      |
|  |  |
| 2025-07-09 | 1.0001                      |
|  |  |
| 2025-07-10 | 1.0001                      |
|  |  |
| 2025-07-11 | 1.0001                      |
|  |  |
| 2025-07-14 | 1.0001                      |
|  |  |
| 2025-07-15 | 1.0000                      |
|  |  |
| 2025-07-16 | 1.0001                      |
|  |  |
| 2025-07-17 | 1.0001                      |
|  |  |
| 2025-07-18 | 1.0001                      |
|  |  |
| 2025-07-21 | 1.0001                      |
|  |  |
| 2025-07-22 | 1.0001                      |
|  |  |
| 2025-07-23 | 1.0001                      |
|  |  |
| 2025-07-24 | 1.0001                      |
|  |  |
| 2025-07-25 | 1.0001                      |
|  |  |
| 2025-07-28 | 1.0001                      |
|  |  |
| 2025-07-29 | 1.0001                      |
|  |  |
| 2025-07-30 | 1.0001                      |
|  |  |
| 2025-07-31 | 1.0001                      |
|  |  |

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

### Class: Single Class

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $18896404871.79

- **Number of Shares Outstanding:** 18896303406.2200

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2025-07-01 | 1.0001          |
|  |  |
| 2025-07-02 | 1.0001          |
|  |  |
| 2025-07-03 | 1.0000          |
|  |  |
| 2025-07-07 | 1.0000          |
|  |  |
| 2025-07-08 | 1.0001          |
|  |  |
| 2025-07-09 | 1.0001          |
|  |  |
| 2025-07-10 | 1.0001          |
|  |  |
| 2025-07-11 | 1.0001          |
|  |  |
| 2025-07-14 | 1.0001          |
|  |  |
| 2025-07-15 | 1.0000          |
|  |  |
| 2025-07-16 | 1.0001          |
|  |  |
| 2025-07-17 | 1.0001          |
|  |  |
| 2025-07-18 | 1.0001          |
|  |  |
| 2025-07-21 | 1.0001          |
|  |  |
| 2025-07-22 | 1.0001          |
|  |  |
| 2025-07-23 | 1.0001          |
|  |  |
| 2025-07-24 | 1.0001          |
|  |  |
| 2025-07-25 | 1.0001          |
|  |  |
| 2025-07-28 | 1.0001          |
|  |  |
| 2025-07-29 | 1.0001          |
|  |  |
| 2025-07-30 | 1.0001          |
|  |  |
| 2025-07-31 | 1.0001          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2025-07-01 | $186094883.00             | $825372230.38           |
| 2025-07-02 | $376136318.67             | $109189758.52           |
| 2025-07-03 | $262633325.59             | $49945260.76            |
| 2025-07-07 | $119751426.20             | $691586395.31           |
| 2025-07-08 | $250339991.23             | $439154774.39           |
| 2025-07-09 | $51970728.14              | $146905936.80           |
| 2025-07-10 | $216846874.50             | $74911261.87            |
| 2025-07-11 | $139001910.32             | $78007651.57            |
| 2025-07-14 | $85718652.47              | $103798971.44           |
| 2025-07-15 | $176776184.15             | $135752538.56           |
| 2025-07-16 | $301904611.35             | $114840080.44           |
| 2025-07-17 | $83591945.90              | $142435053.35           |
| 2025-07-18 | $379087694.67             | $90226303.67            |
| 2025-07-21 | $119581088.14             | $304112443.44           |
| 2025-07-22 | $83051160.01              | $387290653.27           |
| 2025-07-23 | $127372438.21             | $291452697.22           |
| 2025-07-24 | $114568602.90             | $419360049.05           |
| 2025-07-25 | $93103356.27              | $146874133.93           |
| 2025-07-28 | $180413481.21             | $163264779.72           |
| 2025-07-29 | $566656002.01             | $101102191.72           |
| 2025-07-30 | $451065999.69             | $123820834.48           |
| 2025-07-31 | $95032036.77              | $637816851.47           |

**Total Gross Subscriptions (Month):** $4460698711.40

**Total Gross Redemptions (Month):** $5577220851.36

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2025-07-01 | 4.2200%           |
| 2025-07-02 | 4.2200%           |
| 2025-07-03 | 4.2000%           |
| 2025-07-07 | 4.1900%           |
| 2025-07-08 | 4.1900%           |
| 2025-07-09 | 4.1900%           |
| 2025-07-10 | 4.1900%           |
| 2025-07-11 | 4.1900%           |
| 2025-07-14 | 4.1900%           |
| 2025-07-15 | 4.1900%           |
| 2025-07-16 | 4.1900%           |
| 2025-07-17 | 4.1900%           |
| 2025-07-18 | 4.1900%           |
| 2025-07-21 | 4.1900%           |
| 2025-07-22 | 4.1800%           |
| 2025-07-23 | 4.1800%           |
| 2025-07-24 | 4.1700%           |
| 2025-07-25 | 4.1900%           |
| 2025-07-28 | 4.1900%           |
| 2025-07-29 | 4.2000%           |
| 2025-07-30 | 4.2000%           |
| 2025-07-31 | 4.2100%           |

**Beneficial/Record Owner Categories**
| Category                  | Other Category   | Record Owner %   | Beneficial Owner %   |
|:---|:---|:---|:---|
| Non-financial corporation |  | 8.9500%          | 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):** $18964864618.52
- **C.18.a - Value (excl. sponsor support):** $18964864618.52
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2025-08-01
- **C.12 - Maturity Date (WAL):** 2025-08-01
- **C.13 - Final Legal Maturity Date:** 2025-08-01
- **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:** 2025-08-07

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

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

**Title of Signing Officer:** Vice President