N-MFP3 0001060517 XXXXXXXX 2026-07-31 UBS Series Funds 0001060517 54930058UKPXVB81RJ71 UBS Select 100% US Treasury Institutional Fund 529900KWG787B4G5P791 S000084282 2 N N 333-52965 UBS ASSET MANAGEMENT (AMERICAS) LLC 801-34910 Ernst & Young LLP New York NY UBS ASSET MANAGEMENT (AMERICAS) LLC BNY Mellon Investment Servicing (US) Inc. 0000849542 084-01761 Y 0001403166 100 [percent symbol] US Treasury Master Fund S000085171 N N Government N Y 1 1 18552492750.72 18552492750.72 0.9996 0.9996 2026-07-01 18616339566.28 18616339566.28 0.9996 0.9996 2026-07-02 19339139047.23 19339139047.23 0.9996 0.9996 2026-07-06 18994618467.83 18994618467.83 0.9995 0.9995 2026-07-07 19119811240.39 19119811240.39 0.9995 0.9995 2026-07-08 19036453247.36 19036453247.36 0.9995 0.9995 2026-07-09 19182255616.26 19182255616.26 0.9995 0.9995 2026-07-10 19375340013.99 19375340013.99 0.9995 0.9995 2026-07-13 19049724615.55 19049724615.55 0.9995 0.9995 2026-07-14 19112476786.92 19112476786.92 0.9995 0.9995 2026-07-15 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0.00 2026-07-23 0.00 0.00 2026-07-24 0.00 0.00 2026-07-27 0.00 0.00 2026-07-28 0.00 0.00 2026-07-29 0.00 0.00 2026-07-30 0.00 0.00 2026-07-31 289.82 0.00 0.0352 2026-07-01 0.0352 2026-07-02 0.0352 2026-07-06 0.0352 2026-07-07 0.0352 2026-07-08 0.0352 2026-07-09 0.0352 2026-07-10 0.0352 2026-07-13 0.0352 2026-07-14 0.0352 2026-07-15 0.0352 2026-07-16 0.0352 2026-07-17 0.0353 2026-07-20 0.0353 2026-07-21 0.0353 2026-07-22 0.0353 2026-07-23 0.0354 2026-07-24 0.0354 2026-07-27 0.0355 2026-07-28 0.0355 2026-07-29 0.0355 2026-07-30 0.0356 2026-07-31 Y 1.00 Non-financial corporation 1.00 0.00 N 100 [percent symbol] US Treasury Master Fund 100 [percent symbol] US Treasury Master Fund 902656883 5299000M97HC3J8TJ387 0001403166 Investment Company Y 2026-08-03 2026-08-03 2026-08-03 N N N 0.0000 8523044968.20 8523044968.20 1.0000 N Y Y N The master-feeder funds are parties to a written daily liquidity agreement; consistent with SEC staff interpretative guidance, ownership interests in the master fund are categorized as a Daily Liquid Asset/Weekly Liquid Asset by the feeder funds. UBS Series Funds 2026-08-07 /s/Rose Ann Bubloski Rose Ann Bubloski Vice President