PAINEWEBBER MASTER SERIES INC
NSAR-B, 2000-10-30
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<PAGE>      PAGE  1
000 B000000 08/31/2000
000 C000000 0000780403
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 PAINEWEBBER MASTER SERIES, INC.
001 B000000 811-4448
001 C000000 2127133041
002 A000000 51 WEST 52ND STREET
002 B000000 NEW YORK,
002 C000000 NY
002 D010000 10019
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  2
007 C010100  1
007 C010200  2
007 C020200 PW BALANCED FUND (FORMERLY ASSET ALLOCATION)
007 C030200 N
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 MITCHELL HUTCHINS ASSET MANAGEMENT, INC.
008 B00AA01 A
008 C00AA01 801-13219
008 D01AA01 NEW YORK,
008 D02AA01 NY
008 D03AA01 10019
010 A00AA01 MITCHELL HUTCHINS ASSET MANAGEMENT, INC.
010 B00AA01 801-13219
010 C01AA01 NEW YORK,
010 C02AA01 NY
010 C03AA01 10019
011 A00AA01 PAINEWEBBER, INC.
011 B00AA01 8-16267
011 C01AA01 NEW YORK,
011 C02AA01 NY
011 C03AA01 10019
012 A00AA01 PFPC, INC.
<PAGE>      PAGE  2
012 B00AA01 85-0000000
012 C01AA01 WILMINGTON,
012 C02AA01 DE
012 C03AA01 19809
013 A00AA01 PRICEWATERHOUSECOOPERS
013 B01AA01 NEW YORK,
013 B02AA01 NY
013 B03AA01 10036
014 A00AA01 PAINEWEBBER, INC.
014 B00AA01 8-16267
015 A00AA01 STATE STREET BANK & TRUST CO.
015 B00AA01 C
015 C01AA01 NORTH QUINCY,
015 C02AA01 MA
015 C03AA01 02171
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   74
019 C00AA00 PAINEWEBBE
020 A000001 BNY ESI SECURITIES
020 C000001     24
020 A000002 BRIDGE TRADING
020 C000002     20
020 A000003 DONALDSON, LUFKIN & JEN
020 B000003 13-2741729
020 C000003     19
020 A000004 MORGAN STANLEY AND CO
020 B000004 13-2655998
020 C000004     19
020 A000005 GOLDMAN SACHS
020 B000005 13-5108880
020 C000005     13
020 A000006 BEAR STERNS
020 B000006 13-3299429
020 C000006     13
020 A000007 MORGAN, J.P.
020 B000007 13-3224016
020 C000007     13
020 A000008 CS FIRST BOSTON
020 C000008     12
020 A000009 BRICK SECURITIES
020 C000009     11
020 A000010 MERRILL LYNCH PIERCE FENNER SMITH
020 B000010 13-5674085
020 C000010     10
021  000000      246
022 A000001 STATE STREET BANK & TRUST CO.
022 B000001 04-1867445
022 C000001    655001
022 D000001    329204
<PAGE>      PAGE  3
022 A000002 WARBURG
022 B000002 13-3340045
022 C000002    718357
022 D000002      2694
022 A000003 DRESDNER SECURITIES INC.
022 B000003 13-6172414
022 C000003    719447
022 D000003         0
022 A000004 SOCIETE GENERALE
022 B000004 13-1976032
022 C000004    612566
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022 A000005 ZIONS BANK
022 C000005    398149
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022 A000006 HSBC
022 C000006    194030
022 D000006      6395
022 A000007 GOLDMAN SACHS
022 B000007 13-5108880
022 C000007     94627
022 D000007     71771
022 A000008 CS FIRST BOSTON CORP.
022 B000008 13-5659455
022 C000008     68249
022 D000008     48804
022 A000009 MORGAN STANLEY AND CO.
022 B000009 13-2655998
022 C000009     56618
022 D000009     34245
022 A000010 BANK ONE CAPITAL MARKETS
022 C000010     85941
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<PAGE>      PAGE  4
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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080 A00AA00 ICI MUTUAL INSURANCE CO.
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SIGNATURE   PAUL SCHUBERT
TITLE       TREASURER




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