N-MFP3 0001060517 XXXXXXXX 2026-07-31 UBS Series Funds 0001060517 54930058UKPXVB81RJ71 UBS Prime Preferred Fund 5493001YQBD9A4ZH6D79 S000052307 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 10821754942.10 12579453715.95 0.4734 0.5503 2026-07-01 10446502853.59 12470696453.79 0.4554 0.5437 2026-07-02 11224046367.36 12384762398.96 0.4876 0.5381 2026-07-06 10915874929.03 12392285350.43 0.4735 0.5376 2026-07-07 10626971104.17 12128345445.47 0.4603 0.5253 2026-07-08 10363590869.97 11956882257.47 0.4491 0.5182 2026-07-09 10478968815.76 12002455674.26 0.4520 0.5177 2026-07-10 10765818343.51 11748093412.52 0.4663 0.5089 2026-07-13 10710811087.04 11906903291.58 0.4644 0.5162 2026-07-14 10685007778.39 11936046636.11 0.4642 0.5186 2026-07-15 10662740797.82 12184671252.21 0.4631 0.5292 2026-07-16 10699908231.75 12198370373.75 0.4643 0.5294 2026-07-17 11072485128.10 12202245576.50 0.4799 0.5289 2026-07-20 11025761643.89 12205346114.99 0.4761 0.5271 2026-07-21 11061814179.48 12050367951.98 0.4794 0.5222 2026-07-22 10763630414.20 11872093267.20 0.4696 0.5180 2026-07-23 10814046461.84 11885599254.44 0.4714 0.5182 2026-07-24 10946278472.97 11808016266.97 0.4793 0.5170 2026-07-27 10843613513.79 12134553669.55 0.4753 0.5319 2026-07-28 10840526199.86 12306268751.86 0.4758 0.5402 2026-07-29 10502731573.55 12139438047.17 0.4609 0.5327 2026-07-30 10712873113.40 12174758331.24 0.4692 0.5333 2026-07-31 0.00 8718983030.80 0.00 0.00 28929747.41 8690053283.39 8689385564.0210 Y 1.0000 0.0380 2026-07-01 0.0381 2026-07-02 0.0381 2026-07-06 0.0380 2026-07-07 0.0380 2026-07-08 0.0380 2026-07-09 0.0378 2026-07-10 0.0378 2026-07-13 0.0378 2026-07-14 0.0378 2026-07-15 0.0379 2026-07-16 0.0379 2026-07-17 0.0379 2026-07-20 0.0379 2026-07-21 0.0379 2026-07-22 0.0380 2026-07-23 0.0381 2026-07-24 0.0381 2026-07-27 0.0382 2026-07-28 0.0382 2026-07-29 0.0382 2026-07-30 0.0383 2026-07-31 0.9999 2026-07-01 0.9998 2026-07-02 1.0000 2026-07-06 1.0000 2026-07-07 1.0000 2026-07-08 1.0000 2026-07-09 0.9999 2026-07-10 0.9999 2026-07-13 1.0000 2026-07-14 1.0000 2026-07-15 1.0000 2026-07-16 0.9999 2026-07-17 1.0000 2026-07-20 1.0000 2026-07-21 0.9999 2026-07-22 0.9999 2026-07-23 0.9998 2026-07-24 0.9999 2026-07-27 0.9999 2026-07-28 0.9999 2026-07-29 1.0000 2026-07-30 0.9999 2026-07-31 N N Single Class C000164453 50000000.00 8690053283.39 8689385564.0210 0.9999 2026-07-01 0.9998 2026-07-02 1.0000 2026-07-06 1.0000 2026-07-07 1.0000 2026-07-08 1.0000 2026-07-09 0.9999 2026-07-10 0.9999 2026-07-13 1.0000 2026-07-14 1.0000 2026-07-15 1.0000 2026-07-16 0.9999 2026-07-17 1.0000 2026-07-20 1.0000 2026-07-21 0.9999 2026-07-22 0.9999 2026-07-23 0.9998 2026-07-24 0.9999 2026-07-27 0.9999 2026-07-28 0.9999 2026-07-29 1.0000 2026-07-30 0.9999 2026-07-31 90625668.70 54796257.86 2026-07-01 46428065.49 43938380.93 2026-07-02 73687995.75 66645840.65 2026-07-06 52095552.46 42378828.21 2026-07-07 52321310.71 45745737.95 2026-07-08 93857031.15 34438395.35 2026-07-09 64234459.74 51390670.06 2026-07-10 57584031.03 54150239.40 2026-07-13 33602724.23 61006885.97 2026-07-14 27515764.22 61364548.51 2026-07-15 60200410.01 73464513.02 2026-07-16 39936299.26 63292284.18 2026-07-17 41291817.67 57408756.76 2026-07-20 136701110.08 63695963.06 2026-07-21 40522482.95 49966504.06 2026-07-22 19569913.23 152752456.94 2026-07-23 61908562.98 38839357.50 2026-07-24 54474291.44 104874271.17 2026-07-27 31387298.72 42776303.81 2026-07-28 40190239.09 44253307.55 2026-07-29 24227464.47 91605225.42 2026-07-30 103120014.48 30250821.21 2026-07-31 1245482507.86 1329035549.57 0.0366 2026-07-01 0.0367 2026-07-02 0.0367 2026-07-06 0.0366 2026-07-07 0.0366 2026-07-08 0.0366 2026-07-09 0.0364 2026-07-10 0.0364 2026-07-13 0.0364 2026-07-14 0.0364 2026-07-15 0.0365 2026-07-16 0.0365 2026-07-17 0.0365 2026-07-20 0.0365 2026-07-21 0.0365 2026-07-22 0.0366 2026-07-23 0.0367 2026-07-24 0.0367 2026-07-27 0.0368 2026-07-28 0.0368 2026-07-29 0.0368 2026-07-30 0.0369 2026-07-31 Y 318185.00 N Prime CNAV Master Fund Prime CNAV Master Fund 927XQC905 549300K8VKMIOPMVLW91 0001403166 927XQC905 Investment Company Y 2026-08-03 2026-08-03 2026-08-03 N N N 0.0000 8718983030.80 8718983030.80 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 2026-08-07 /s/Rose Ann Bubloski Rose Ann Bubloski Vice President