# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001410368-26-042923
**Filing Date:** 2026-5
**Character Count:** 13929
**Document Hash:** 78b43734d7599c94d6a8db94a360f6d4
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-042923.hdr.sgml**: 20260507

**ACCESSION NUMBER**: 0001410368-26-042923

**CONFORMED SUBMISSION TYPE**: N-MFP3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260430

**FILED AS OF DATE**: 20260507

**DATE AS OF CHANGE**: 20260507

**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:** 26952696

**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 Government Institutional Fund (Series ID: S000053131)

| Class ID   | Class Name                               | Ticker Symbol   |
|:---|:---|:---|
| C000167199 | UBS Select Government Institutional Fund | SEGXX           |

# 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):** 2026-04-30

**Registrant Full Name:** UBS Series Funds

**CIK Number of Registrant:** 0001060517

**LEI of Registrant:** 54930058UKPXVB81RJ71

**Name of Series:** UBS Select Government Institutional Fund

**LEI of Series:** 549300TZ2QEM4T3XX713

**EDGAR Series Identifier:** S000053131

**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?:** No

- **WAM:** 1 days

- **WAL:** 1 days

- **Total Value of Portfolio Securities:** $9099728993.70

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

- **Cash:** $0.00

- **Total Other Assets:** $0.00

- **Total Liabilities:** $26593409.68

- **Net Assets of Series:** $9073135584.02

- **Number of Shares Outstanding (Series):** 9072934058.7000

- **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 (%)   |
|:---|:---|:---|:---|:---|
| 2026-04-01 | $13850449478.24           | $15059021659.23            | 54.4400%                  | 59.2000%                   |
| 2026-04-02 | $13703237170.69           | $14911906870.69            | 54.1600%                  | 58.9400%                   |
| 2026-04-03 | $0.00                     | $0.00                      | 0.0000%                   | 0.0000%                    |
| 2026-04-06 | $13296372746.65           | $14505447246.65            | 53.4100%                  | 58.2700%                   |
| 2026-04-07 | $12943790116.11           | $14073973716.11            | 52.5600%                  | 57.1500%                   |
| 2026-04-08 | $12797670040.52           | $13801979687.08            | 52.5400%                  | 56.6700%                   |
| 2026-04-09 | $12873827117.29           | $13878233272.50            | 52.6900%                  | 56.8000%                   |
| 2026-04-10 | $12732383403.16           | $13940623361.07            | 52.4000%                  | 57.3700%                   |
| 2026-04-13 | $12441462099.78           | $13988968133.95            | 51.8200%                  | 58.2700%                   |
| 2026-04-14 | $11848935428.90           | $13396566256.33            | 50.6000%                  | 57.2100%                   |
| 2026-04-15 | $11978048297.30           | $13525810253.42            | 50.8800%                  | 57.4500%                   |
| 2026-04-16 | $11907274239.82           | $13455173002.48            | 50.4800%                  | 57.0500%                   |
| 2026-04-17 | $11821995198.26           | $13370013260.54            | 49.8000%                  | 56.3200%                   |
| 2026-04-20 | $12129890238.73           | $13806551803.52            | 50.4400%                  | 57.4200%                   |
| 2026-04-21 | $12458729047.24           | $14079584184.78            | 51.5500%                  | 58.2600%                   |
| 2026-04-22 | $12999674704.95           | $14620668978.67            | 52.6100%                  | 59.1700%                   |
| 2026-04-23 | $12656422820.01           | $14404548307.30            | 51.8100%                  | 58.9700%                   |
| 2026-04-24 | $12596604862.95           | $14344854153.16            | 50.9300%                  | 58.0000%                   |
| 2026-04-27 | $12891772026.52           | $14793631891.35            | 51.4300%                  | 59.0200%                   |
| 2026-04-28 | $13108637237.75           | $15010636176.20            | 51.8200%                  | 59.3400%                   |
| 2026-04-29 | $12787772006.41           | $14562924300.71            | 51.4600%                  | 58.6000%                   |
| 2026-04-30 | $12364746343.13           | $14140044226.65            | 50.6600%                  | 57.9300%                   |

### 7-Day Gross Yield
| Date       | 7-Day Gross Yield   |
|:---|:---|
| 2026-04-01 | 3.7100%             |
| 2026-04-02 | 3.7000%             |
| 2026-04-03 | 0.0000%             |
| 2026-04-06 | 3.7000%             |
| 2026-04-07 | 3.7000%             |
| 2026-04-08 | 3.7000%             |
| 2026-04-09 | 3.6900%             |
| 2026-04-10 | 3.6800%             |
| 2026-04-13 | 3.6800%             |
| 2026-04-14 | 3.6800%             |
| 2026-04-15 | 3.6900%             |
| 2026-04-16 | 3.6900%             |
| 2026-04-17 | 3.7100%             |
| 2026-04-20 | 3.7100%             |
| 2026-04-21 | 3.7100%             |
| 2026-04-22 | 3.7000%             |
| 2026-04-23 | 3.7000%             |
| 2026-04-24 | 3.7000%             |
| 2026-04-27 | 3.7000%             |
| 2026-04-28 | 3.7000%             |
| 2026-04-29 | 3.7100%             |
| 2026-04-30 | 3.7100%             |

### Daily Net Asset Value per Share (Series)
| Date       | Net Asset Value per Share   |
|:---|:---|
| 2026-04-01 | 1.0000                      |
|  |  |
| 2026-04-02 | 0.9999                      |
|  |  |
| 2026-04-03 | 0.0000                      |
|  |  |
| 2026-04-06 | 1.0000                      |
|  |  |
| 2026-04-07 | 1.0000                      |
|  |  |
| 2026-04-08 | 1.0000                      |
|  |  |
| 2026-04-09 | 1.0000                      |
|  |  |
| 2026-04-10 | 0.9999                      |
|  |  |
| 2026-04-13 | 1.0000                      |
|  |  |
| 2026-04-14 | 1.0000                      |
|  |  |
| 2026-04-15 | 1.0000                      |
|  |  |
| 2026-04-16 | 1.0000                      |
|  |  |
| 2026-04-17 | 0.9999                      |
|  |  |
| 2026-04-20 | 1.0000                      |
|  |  |
| 2026-04-21 | 1.0000                      |
|  |  |
| 2026-04-22 | 1.0000                      |
|  |  |
| 2026-04-23 | 1.0000                      |
|  |  |
| 2026-04-24 | 0.9999                      |
|  |  |
| 2026-04-27 | 1.0000                      |
|  |  |
| 2026-04-28 | 1.0000                      |
|  |  |
| 2026-04-29 | 1.0000                      |
|  |  |
| 2026-04-30 | 1.0000                      |
|  |  |

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

### Class: Basis A

- **Minimum Initial Investment:** $1000000.00

- **Net Assets of Class:** $9073135584.02

- **Number of Shares Outstanding:** 9072934058.7000

**Daily Net Asset Value per Share (Class)**
| Date       | NAV per Share   |
|:---|:---|
| 2026-04-01 | 1.0000          |
|  |  |
| 2026-04-02 | 0.9999          |
|  |  |
| 2026-04-03 | 0.0000          |
|  |  |
| 2026-04-06 | 1.0000          |
|  |  |
| 2026-04-07 | 1.0000          |
|  |  |
| 2026-04-08 | 1.0000          |
|  |  |
| 2026-04-09 | 1.0000          |
|  |  |
| 2026-04-10 | 0.9999          |
|  |  |
| 2026-04-13 | 1.0000          |
|  |  |
| 2026-04-14 | 1.0000          |
|  |  |
| 2026-04-15 | 1.0000          |
|  |  |
| 2026-04-16 | 1.0000          |
|  |  |
| 2026-04-17 | 0.9999          |
|  |  |
| 2026-04-20 | 1.0000          |
|  |  |
| 2026-04-21 | 1.0000          |
|  |  |
| 2026-04-22 | 1.0000          |
|  |  |
| 2026-04-23 | 1.0000          |
|  |  |
| 2026-04-24 | 0.9999          |
|  |  |
| 2026-04-27 | 1.0000          |
|  |  |
| 2026-04-28 | 1.0000          |
|  |  |
| 2026-04-29 | 1.0000          |
|  |  |
| 2026-04-30 | 1.0000          |
|  |  |

**Daily Shareholder Flows**
| Date       | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| 2026-04-01 | $109400236.09             | $90064607.38            |
| 2026-04-02 | $50764681.02              | $96771068.20            |
| 2026-04-03 | $0.00                     | $0.00                   |
| 2026-04-06 | $95729233.42              | $96045532.07            |
| 2026-04-07 | $71622814.18              | $48101983.99            |
| 2026-04-08 | $50715001.49              | $186261392.01           |
| 2026-04-09 | $68355178.69              | $159515460.64           |
| 2026-04-10 | $55743424.68              | $99197391.27            |
| 2026-04-13 | $52824524.24              | $209809629.07           |
| 2026-04-14 | $58987488.93              | $168259359.74           |
| 2026-04-15 | $63377126.09              | $65155402.15            |
| 2026-04-16 | $113927172.75             | $66145509.96            |
| 2026-04-17 | $93161043.05              | $36889092.60            |
| 2026-04-20 | $47194628.45              | $56189100.49            |
| 2026-04-21 | $49389565.95              | $70662213.24            |
| 2026-04-22 | $55781245.97              | $42255026.55            |
| 2026-04-23 | $97461025.39              | $62133400.69            |
| 2026-04-24 | $55067592.00              | $55449596.89            |
| 2026-04-27 | $76024704.63              | $50654533.47            |
| 2026-04-28 | $60318777.51              | $47449002.89            |
| 2026-04-29 | $56834307.11              | $133820480.00           |
| 2026-04-30 | $67020046.42              | $65064623.02            |

**Total Gross Subscriptions (Month):** $1449699818.06

**Total Gross Redemptions (Month):** $1905894406.32

**7-Day Net Yield (Class)**
| Date       | 7-Day Net Yield   |
|:---|:---|
| 2026-04-01 | 3.5300%           |
| 2026-04-02 | 3.5200%           |
| 2026-04-03 | 0.0000%           |
| 2026-04-06 | 3.5200%           |
| 2026-04-07 | 3.5200%           |
| 2026-04-08 | 3.5200%           |
| 2026-04-09 | 3.5100%           |
| 2026-04-10 | 3.5000%           |
| 2026-04-13 | 3.5000%           |
| 2026-04-14 | 3.5000%           |
| 2026-04-15 | 3.5100%           |
| 2026-04-16 | 3.5100%           |
| 2026-04-17 | 3.5300%           |
| 2026-04-20 | 3.5300%           |
| 2026-04-21 | 3.5300%           |
| 2026-04-22 | 3.5200%           |
| 2026-04-23 | 3.5200%           |
| 2026-04-24 | 3.5200%           |
| 2026-04-27 | 3.5200%           |
| 2026-04-28 | 3.5200%           |
| 2026-04-29 | 3.5300%           |
| 2026-04-30 | 3.5200%           |

## Part C: Schedule of Portfolio Securities

### Security 1: Government Master Fund

- **C.1 - Title:** Government Master Fund
- **C.6 - Investment Category:** Investment Company
- **Identifiers:** C.3 - CUSIP: 976WHL907, C.3 - LEI: 54930015XY4J2ENG8G36, C.5 - Other ID: 976WHL907
- **C.18 - Value (incl. sponsor support):** $9099728993.68
- **C.18.a - Value (excl. sponsor support):** $9099728993.68
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2026-05-01
- **C.12 - Maturity Date (WAL):** 2026-05-01
- **C.13 - Final Legal Maturity Date:** 2026-05-01
- **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:** 2026-05-07

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

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

**Title of Signing Officer:** Vice President