N-MFP3 0001060517 XXXXXXXX 2026-06-30 UBS Series Funds 0001060517 54930058UKPXVB81RJ71 UBS Prime Reserves Fund 549300SZFUYVRC9F4568 S000052306 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 Prime CNAV Master Fund S000053209 N N Prime Y N 1 1 11294547770.72 12066752201.36 0.4829 0.5160 2026-06-01 11360441786.22 12179101886.22 0.4831 0.5179 2026-06-02 11133989107.52 12032569928.52 0.4764 0.5149 2026-06-03 10912668875.70 12203037994.80 0.4672 0.5224 2026-06-04 10947007708.49 12188478842.39 0.4685 0.5216 2026-06-05 11318245665.61 12279973772.81 0.4825 0.5235 2026-06-08 11127285620.72 12297849962.32 0.4735 0.5233 2026-06-09 11177020014.08 12210538325.58 0.4782 0.5224 2026-06-10 10882352428.51 12019847792.71 0.4694 0.5185 2026-06-11 10991214106.46 12003838950.26 0.4743 0.5180 2026-06-12 11299595060.63 11888496177.63 0.4901 0.5156 2026-06-15 11115685457.88 11849370694.88 0.4829 0.5148 2026-06-16 11050532704.27 11844137325.27 0.4802 0.5147 2026-06-17 10865228627.55 11813785820.05 0.4726 0.5139 2026-06-18 11199193810.88 11748103119.88 0.4886 0.5125 2026-06-22 11091894726.07 11800597645.57 0.4828 0.5136 2026-06-23 11074457551.62 11853070389.12 0.4815 0.5154 2026-06-24 10731927351.83 11840458612.83 0.4694 0.5179 2026-06-25 10738602681.51 11923636698.86 0.4694 0.5212 2026-06-26 11064425115.00 12548371206.30 0.4847 0.5498 2026-06-29 10924868864.96 12767603897.36 0.4757 0.5559 2026-06-30 0.00 14043964090.57 0.00 0.00 42329901.61 14001634188.96 14000785391.0400 Y 1.0000 0.0380 2026-06-01 0.0380 2026-06-02 0.0379 2026-06-03 0.0379 2026-06-04 0.0379 2026-06-05 0.0379 2026-06-08 0.0379 2026-06-09 0.0378 2026-06-10 0.0378 2026-06-11 0.0379 2026-06-12 0.0379 2026-06-15 0.0379 2026-06-16 0.0380 2026-06-17 0.0380 2026-06-18 0.0379 2026-06-22 0.0379 2026-06-23 0.0379 2026-06-24 0.0379 2026-06-25 0.0379 2026-06-26 0.0379 2026-06-29 0.0380 2026-06-30 1.0000 2026-06-01 1.0000 2026-06-02 1.0000 2026-06-03 1.0000 2026-06-04 0.9999 2026-06-05 1.0000 2026-06-08 1.0000 2026-06-09 1.0000 2026-06-10 1.0000 2026-06-11 0.9999 2026-06-12 1.0000 2026-06-15 1.0000 2026-06-16 1.0000 2026-06-17 0.9998 2026-06-18 0.9999 2026-06-22 0.9999 2026-06-23 0.9999 2026-06-24 0.9999 2026-06-25 0.9999 2026-06-26 0.9999 2026-06-29 0.9999 2026-06-30 N N Single Class C000164452 1000000.00 14001634188.96 14000785391.0400 1.0000 2026-06-01 1.0000 2026-06-02 1.0000 2026-06-03 1.0000 2026-06-04 0.9999 2026-06-05 1.0000 2026-06-08 1.0000 2026-06-09 1.0000 2026-06-10 1.0000 2026-06-11 0.9999 2026-06-12 1.0000 2026-06-15 1.0000 2026-06-16 1.0000 2026-06-17 0.9998 2026-06-18 0.9999 2026-06-22 0.9999 2026-06-23 0.9999 2026-06-24 0.9999 2026-06-25 0.9999 2026-06-26 0.9999 2026-06-29 0.9999 2026-06-30 126880311.96 145456204.62 2026-06-01 76055053.54 71661643.75 2026-06-02 73661476.76 100626610.58 2026-06-03 68871807.85 69590517.88 2026-06-04 63043552.85 70231208.35 2026-06-05 63193646.60 75687232.52 2026-06-08 69149008.83 78880485.91 2026-06-09 58130760.94 71465546.23 2026-06-10 57673461.72 91419497.33 2026-06-11 74162687.48 75305922.42 2026-06-12 51977244.26 103379243.03 2026-06-15 73904857.56 96022625.56 2026-06-16 80691401.41 69008464.39 2026-06-17 64950113.15 77371890.98 2026-06-18 71557017.43 119595906.89 2026-06-22 63575735.25 79894501.19 2026-06-23 162424520.81 112577400.97 2026-06-24 72346533.44 170079192.56 2026-06-25 66336793.22 65815061.86 2026-06-26 74604340.21 94118821.42 2026-06-29 77214544.45 58760888.99 2026-06-30 1590404869.72 1896948867.43 0.0362 2026-06-01 0.0362 2026-06-02 0.0361 2026-06-03 0.0361 2026-06-04 0.0361 2026-06-05 0.0361 2026-06-08 0.0361 2026-06-09 0.0360 2026-06-10 0.0360 2026-06-11 0.0361 2026-06-12 0.0361 2026-06-15 0.0361 2026-06-16 0.0362 2026-06-17 0.0362 2026-06-18 0.0361 2026-06-22 0.0361 2026-06-23 0.0361 2026-06-24 0.0361 2026-06-25 0.0361 2026-06-26 0.0361 2026-06-29 0.0362 2026-06-30 N 0.00 N Prime CNAV Master Fund Prime CNAV Master Fund 927XQC905 549300K8VKMIOPMVLW91 0001403166 927XQC905 Investment Company Y 2026-07-01 2026-07-01 2026-07-01 N N N 0.0000 14043964090.57 14043964090.57 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. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 N/A UBS Series Funds 2026-07-08 /s/Rose Ann Bubloski Rose Ann Bubloski Vice President