N-MFP3 0001060517 XXXXXXXX 2026-08-31 UBS Series Funds 0001060517 54930058UKPXVB81RJ71 UBS Select Treasury Institutional Fund 549300OA0OSRYE6ZYO90 S000002682 1 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 Treasury Master Fund S000019503 N N Government N Y 1 1 42337237235.56 42337237235.56 0.9999 0.9999 2026-08-03 42410995658.86 42410995658.86 0.9999 0.9999 2026-08-04 42633944381.73 42633944381.73 0.9999 0.9999 2026-08-05 41350035004.57 41350035004.57 0.9999 0.9999 2026-08-06 41361720652.27 41361720652.27 0.9998 0.9998 2026-08-07 42431294538.72 42431294538.72 0.9999 0.9999 2026-08-10 42119781990.27 42119781990.27 0.9999 0.9999 2026-08-11 41929487095.64 41929487095.64 0.9998 0.9998 2026-08-12 41693882208.45 41693882208.45 0.9998 0.9998 2026-08-13 41631904333.98 41631904333.98 0.9997 0.9997 2026-08-14 42533018907.45 42533018907.45 0.9998 0.9998 2026-08-17 42551572338.71 42551572338.71 0.9998 0.9998 2026-08-18 42304071683.63 42304071683.63 0.9998 0.9998 2026-08-19 41648395902.05 41648395902.05 0.9998 0.9998 2026-08-20 42556606342.94 42556606342.94 0.9997 0.9997 2026-08-21 43485085975.94 43485085975.94 0.9998 0.9998 2026-08-24 42268630408.95 42268630408.95 0.9997 0.9997 2026-08-25 42039551548.62 42039551548.62 0.9997 0.9997 2026-08-26 40972538266.36 40972538266.36 0.9997 0.9997 2026-08-27 42089011265.30 42089011265.30 0.9996 0.9996 2026-08-28 41375435366.46 41375435366.46 0.9997 0.9997 2026-08-31 0.00 16398215203.30 0.00 0.00 50569185.98 16347646017.32 16347019641.4600 Y 1.0000 0.0374 2026-08-03 0.0374 2026-08-04 0.0374 2026-08-05 0.0373 2026-08-06 0.0372 2026-08-07 0.0372 2026-08-10 0.0372 2026-08-11 0.0372 2026-08-12 0.0372 2026-08-13 0.0372 2026-08-14 0.0373 2026-08-17 0.0373 2026-08-18 0.0373 2026-08-19 0.0373 2026-08-20 0.0373 2026-08-21 0.0373 2026-08-24 0.0373 2026-08-25 0.0374 2026-08-26 0.0374 2026-08-27 0.0374 2026-08-28 0.0375 2026-08-31 1.0001 2026-08-03 1.0001 2026-08-04 1.0001 2026-08-05 1.0001 2026-08-06 1.0001 2026-08-07 1.0001 2026-08-10 1.0001 2026-08-11 1.0001 2026-08-12 1.0001 2026-08-13 1.0001 2026-08-14 1.0001 2026-08-17 1.0001 2026-08-18 1.0001 2026-08-19 1.0001 2026-08-20 1.0001 2026-08-21 1.0001 2026-08-24 1.0001 2026-08-25 1.0001 2026-08-26 1.0001 2026-08-27 1.0001 2026-08-28 1.0001 2026-08-31 N N Single Class C000007334 1000000.00 16347646017.32 16347019641.4600 1.0001 2026-08-03 1.0001 2026-08-04 1.0001 2026-08-05 1.0001 2026-08-06 1.0001 2026-08-07 1.0001 2026-08-10 1.0001 2026-08-11 1.0001 2026-08-12 1.0001 2026-08-13 1.0001 2026-08-14 1.0001 2026-08-17 1.0001 2026-08-18 1.0001 2026-08-19 1.0001 2026-08-20 1.0001 2026-08-21 1.0001 2026-08-24 1.0001 2026-08-25 1.0001 2026-08-26 1.0001 2026-08-27 1.0001 2026-08-28 1.0001 2026-08-31 132406635.67 270219301.77 2026-08-03 84880444.42 130386666.97 2026-08-04 124509665.24 95063053.81 2026-08-05 260991844.33 72069151.60 2026-08-06 123094842.18 173406009.71 2026-08-07 147963443.65 90748766.86 2026-08-10 74598471.63 228792735.90 2026-08-11 183146247.33 89837851.98 2026-08-12 96020752.71 108905786.57 2026-08-13 90597730.63 194862585.48 2026-08-14 447417063.77 97474130.56 2026-08-17 107020595.20 152199474.32 2026-08-18 79809664.01 293895225.98 2026-08-19 78747182.57 166621274.19 2026-08-20 351027417.13 94711211.14 2026-08-21 174495095.16 88418076.29 2026-08-24 103356346.21 178423942.45 2026-08-25 116525972.65 290639537.06 2026-08-26 55539796.58 254692883.46 2026-08-27 111522514.43 180342816.88 2026-08-28 84497729.53 148176532.82 2026-08-31 3028169455.03 3399887015.80 0.0356 2026-08-03 0.0356 2026-08-04 0.0356 2026-08-05 0.0356 2026-08-06 0.0355 2026-08-07 0.0354 2026-08-10 0.0354 2026-08-11 0.0354 2026-08-12 0.0354 2026-08-13 0.0354 2026-08-14 0.0355 2026-08-17 0.0355 2026-08-18 0.0355 2026-08-19 0.0355 2026-08-20 0.0355 2026-08-21 0.0355 2026-08-24 0.0356 2026-08-25 0.0356 2026-08-26 0.0356 2026-08-27 0.0356 2026-08-28 0.0357 2026-08-31 N 0.00 N Treasury Master Fund Treasury Master Fund 81699K911 549300XQ6V293JKF0677 0001403166 81699K911 Investment Company Y 2026-09-01 2026-09-01 2026-09-01 N N N 0.0000 16398215203.30 16398215203.30 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 2026-09-08 /s/Rose Ann Bubloski Rose Ann Bubloski Vice President