# EDGAR Filing Document

**Accession Number:** 0001060517
**File Stem:** 0001145549-23-000769
**Filing Date:** 2023-1
**Character Count:** 6228
**Document Hash:** 23b65506340a733c0960919723f2668a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001145549-23-000769.hdr.sgml**: 20230109

**ACCESSION NUMBER**: 0001145549-23-000769

**CONFORMED SUBMISSION TYPE**: N-MFP2

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20221231

**FILED AS OF DATE**: 20230109

**DATE AS OF CHANGE**: 20230109

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** UBS Series Funds
- **CENTRAL INDEX KEY:** 0001060517
- **IRS NUMBER:** 134010447
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0430

**FILING VALUES:**
- **FORM TYPE:** N-MFP2
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-08767
- **FILM NUMBER:** 23518378

**BUSINESS ADDRESS:**
- **STREET 1:** C/O UBS ASSET MANAGEMENT (AMERICAS) INC
- **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) INC
- **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 Tax-Free Investor Fund (Series ID: S000018681)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000051804 | UBS Tax-Free Investor Fund | SFRXX           |

# Form N-MFP: Monthly Schedule of Portfolio Holdings

## N-MFP: Filer Information

**Submission Type:** N-MFP2

**Live/Test Flag:** —

**Is Electronic Copy of Paper Format:** —

**CIK:** —

### General Information

**Report for (YYYY-MM-DD):** 2022-12-31

**EDGAR Series Identifier:** S000018681

**Total number of share classes in the series:** —

**Is this the fund's final filing on Form N-MFP?:** —

**Is Fund Liquidating?:** —

**Is Fund Merging/Being Acquired?:** —

**Has the fund acquired or merged with another fund during the reporting period?:** —

## Part A: Series-Level Information about the Fund

### Service Providers
| Item   | Role                          | Details                                                      | File/CIK Number   |
|:---|:---|:---|:---|
| A.5    | Administrator                 | UBS ASSET MANAGEMENT (AMERICAS) INC.                         |  |
| A.4    | Independent Public Accountant | Ernst & Young  LLP<br>City: New York<br>State: NY            |  |
| A.6    | Transfer Agent                | BNY Mellon Investment Servicing (US) Inc.<br>CIK: 0000849542 | 084-01761         |

### Fund Characteristics & Assets

- **A.1 - Securities Act File Number:** 333-52965

- **A.7 - Is this a Feeder Fund?:** Yes

- **A.8 - Is this a Master Fund?:** No

- **A.9 - Is this series primarily used to fund insurance company separate accounts?:** No

- **A.10 - Money Market Fund Category:** Other Tax Exempt

- **A.11 - WAM:** 1 days

- **A.12 - WAL:** 1 days

- **Total Value of Portfolio Securities:** $31515015.15

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

- **Cash:** $0.00

- **Total Other Assets:** $9962.91

- **Total Liabilities:** $83953.44

- **Net Assets of Series:** $31441024.62

- **Number of Shares Outstanding (Series):** 31441037.00

- **Stable Price Per Share:** $1.00

- **7-Day Gross Yield:** 3.5600%

### Weekly Liquid Assets
| Period         | Daily Liquid Assets ($)   | Weekly Liquid Assets ($)   | Daily Liquid Assets (%)   | Weekly Liquid Assets (%)   |
|:---|:---|:---|:---|:---|
| Friday, Week 1 |  | $947128840.12              |  | 97.5800%                   |
| Friday, Week 2 |  | $866576316.64              |  | 95.0500%                   |
| Friday, Week 3 |  | $873415369.92              |  | 96.2200%                   |
| Friday, Week 4 |  | $935368363.30              |  | 96.3700%                   |
| Friday, Week 5 |  | $1085231816.82             |  | 97.3300%                   |

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

### Class: Unknown Class (—)

- **B.2 - Minimum Initial Investment:** $1000.00

- **B.3 - Net Assets of Class:** $31441024.62

- **B.4 - Shares Outstanding:** 31441037.00

- **B.7.7 - 7-Day Net Yield:** 3.1100%

- **Person Paying for Fund Expenses?:** Yes

- **Expense Reimbursement/Waiver Description:** UBS Asset Management (US) Inc Expense cap waiver and/or reimbursement 1,479   UBS Asset Management (Americas) Inc Expense cap waiver and/or reimbursement 44,517

**Weekly Flows:**

| Period   | Gross Subscriptions ($)   | Gross Redemptions ($)   |
|:---|:---|:---|
| Week 1   | $31214.20                 | $150140.05              |
| Week 2   | $15.52                    | $1056761.29             |
| Week 3   | $0.00                     | $1190871.91             |
| Week 4   | $0.00                     | $966340.68              |
| Week 5   | $0.00                     | $18990.00               |

**Monthly Shareholder Flow Activity:**

- **Gross Subscriptions for month:** $31229.72

- **Gross Redemptions for month:** $3383103.93

## Part C: Schedule of Portfolio Securities

### Security 1: Tax Free Master Fund

- **C.1 - Title:** Tax Free Master Fund
- **C.6 - Investment Category:** Investment Company
- **Identifiers:** CIK: 0001403166, C.5 - Other ID: 87699X993
- **C.18 - Value (incl. sponsor support):** $31515015.15
- **C.18.a - Value (excl. sponsor support):** $31515015.15
- **Principal Amount:** —
- **Amortized Cost:** —
- **Fair Value:** —
- **C.19 - Percentage of Net Assets:** 100.0000%
- **C.17 - Yield as of Reporting Date:** 0.0000%
- **C.11 - Maturity Date (WAM):** 2023-01-03
- **C.12 - Maturity Date (WAL):** 2023-01-03
- **C.13 - Final Legal Maturity Date:** 2023-01-03
- **Characteristics:** 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:** 2023-01-09

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

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

**Title of Signing Officer:** Vice President