# UBS Select 100% US Treasury Institutional Fund — new fund registration

UBS Series Funds registered 2 new fund series on Form 485APOS, filed 2023-12-26. Featured series: UBS Select 100% US Treasury Institutional Fund.

## Registration

- Registrant / trust: UBS Series Funds
- CIK: 0001060517
- Form: 485APOS
- Filed: 2023-12-26
- State of incorporation: DE
- Accession: 0001193125-23-302829

## Series & classes (2)

| Series | Class | Ticker | New |
| --- | --- | --- | --- |
| [UBS Select 100% US Treasury Institutional Fund](https://search.stillhousedata.com/fund/S000084282) | UBS Select 100% US Treasury Institutional Fund | SIOXX | Yes |
| [UBS Select 100% US Treasury Preferred Fund](https://search.stillhousedata.com/fund/S000084283) | UBS Select 100% US Treasury Preferred Fund | STAXX | Yes |

## Fees (from the effective prospectus)

- 12b-1 fee: 0.00%
- Gross expense ratio: 0.22%
- Management fee: 0.18%
- Net expense ratio: 0.18%
- Other expenses: 0.04%

## Investment objective

Maximum current income consistent with liquidity and the preservation of capital.

## Advisers

- [UBS Asset Management (Americas) LLC (Advisor)](https://search.stillhousedata.com/firm/106838)

## Other filings by this registrant (15)

- [485APOS — 2026-05-29 (3 new series)](https://search.stillhousedata.com/launch/0001193125-26-248454)
- [485APOS — 2025-11-26](https://search.stillhousedata.com/launch/0001193125-25-300561)
- [485APOS — 2024-01-22](https://search.stillhousedata.com/launch/0001193125-24-012234)
- [485APOS — 2023-09-29 (1 new series)](https://search.stillhousedata.com/launch/0001193125-23-247319)
- [485APOS — 2019-10-15 (3 new series)](https://search.stillhousedata.com/launch/0001193125-19-267798)
- [485APOS — 2018-03-09 (3 new series)](https://search.stillhousedata.com/launch/0001193125-18-077501)
- [485APOS — 2016-06-23](https://search.stillhousedata.com/launch/0001193125-16-630206)
- [485APOS — 2015-12-30 (5 new series)](https://search.stillhousedata.com/launch/0001193125-15-417634)
- [485APOS — 2015-10-16 (3 new series)](https://search.stillhousedata.com/launch/0001193125-15-345801)
- [485APOS — 2012-06-29](https://search.stillhousedata.com/launch/0001206774-12-002855)
- [485APOS — 2011-06-29](https://search.stillhousedata.com/launch/0001104659-11-037077)
- [485APOS — 2010-06-24](https://search.stillhousedata.com/launch/0001209286-10-000299)

## More

- [Registrant profile: UBS Series Funds](https://search.stillhousedata.com/registrant/1060517)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/launch/0001193125-23-302829.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.