X0101 EFFECT 33 LIVE 2024-01-23 14:30:00

N-14

0001060517 UBS Series Funds 333-276127 0001060517 UBS Series Funds S000002681 UBS Select Prime Institutional Fund C000007332 UBS Select Prime Institutional Fund 0001060517 UBS Series Funds S000067420 UBS Select ESG Prime Institutional Fund C000216777 UBS Select ESG Prime Institutional Fund 0001060517 UBS Series Funds S000018676 UBS Select Prime Preferred Fund C000051799 UBS Select Prime Preferred Fund 0001060517 UBS Series Funds S000067418 UBS Select ESG Prime Preferred Fund C000216775 UBS Select ESG Prime Preferred Fund: