N-MFP2 0001060517 XXXXXXXX 2019-03-31 0001060517 S000018680 1 N N 333-52965 UBS ASSET MANAGEMENT (AMERICAS), INC. 801-34910 Ernst & Young LLP New York NY UBS ASSET MANAGEMENT (AMERICAS) INC. BNY Mellon Investment Servicing (US) Inc. 0000849542 084-01761 Y 0001403166 Treasury Master Fund S000019503 N N Exempt Government N 1 1 14315984940.66 14014807434.58 13842762195.40 14262033595.59 13897436488.78 17065984940.66 16764807434.58 16592762195.40 17012033595.59 16647436488.78 0.8383 0.8353 0.8335 0.8375 0.8338 0.9993 0.9992 0.9991 0.9990 0.9988 0.00 1185962684.94 0.00 14627.75 2375197.27 1183602115.42 1183602090.5400 1.0000 0.0247 1.0000 1.0000 1.0000 1.0000 1.0000 C000051803 10000.00 1183602115.42 1183602090.5400 1.0000 1.0000 1.0000 1.0000 1.0000 50983261.70 26933073.41 51250488.07 27854972.45 58396285.88 28357894.66 51197281.46 27904465.44 60932250.11 46750906.92 232076942.27 135129726.31 0.0202 Y UBS Asset Management (US) Inc Expense cap waiver and/or reimbursement 48,492 UBS Asset Management (Americas) Inc Expense cap waiver and/or reimbursement 69,955 Treasury Master Fund Treasury Master Fund 0001403166 81699K911 Investment Company Y 2019-04-01 2019-04-01 2019-04-01 N N N 0.0000 1185962684.94 1185962684.94 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 2019-04-05 /s/Nancy Osborn Nancy Osborn Vice President