<SEC-DOCUMENT>0001193125-21-228759-index.html : 20210729
<SEC-HEADER>0001193125-21-228759.hdr.sgml : 20210729
<ACCEPTANCE-DATETIME>20210729134430
ACCESSION NUMBER:		0001193125-21-228759
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20210729
DATE AS OF CHANGE:		20210729
EFFECTIVENESS DATE:		20210729

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:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-52965
		FILM NUMBER:		211126371

	BUSINESS ADDRESS:	
		STREET 1:		C/O UBS ASSET MANAGEMENT (AMERICAS) INC
		STREET 2:		12TH FLOOR 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) INC
		STREET 2:		12TH FLOOR 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>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0001060517
<SERIES-ID>S000067419
<SERIES-NAME>UBS Select ESG Prime Investor Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000216776
<CLASS-CONTRACT-NAME>UBS Select ESG Prime Investor Fund
<CLASS-CONTRACT-TICKER-SYMBOL>SEIXX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>d230226d497.htm
<DESCRIPTION>UBS SERIES FUNDS
<TEXT>
Document 1 - file: d230226d497.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g2302267mm_k.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g2302267mm_k.jpg

</DOCUMENT>
</SEC-DOCUMENT>