PAGE 1
000 A000000 06/30/2004
000 C000000 0000093730
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 ALLMERICA SECURITIES TRUST
001 B000000 811-2338
001 C000000 5088553498
002 A000000 440 LINCOLN STREET
002 B000000 WORCESTER
002 C000000 MA
002 D010000 01653
002 D020000 1959
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
007 C010200 2
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 A000001 OPUS INVESTMENT MANAGEMENT, INC.
008 B000001 A
008 C000001 801-44189
008 D010001 WORCESTER
008 D020001 MA
008 D030001 01653
008 D040001 1959
010 A000001 INVESTORS BANK & TRUST COMPANY
010 B000001 85-720
010 C010001 BOSTON
010 C020001 MA
010 C030001 02116
012 A000001 THE BANK OF NEW YORK
012 B000001 85-05006
012 C010001 NEW YORK
012 C020001 NY
012 C030001 10286
013 A000001 PRICEWATERHOUSECOOPERS, LLP
PAGE 2
013 B010001 BOSTON
013 B020001 MA
013 B030001 02109
014 A000001 VERAVEST INVESTMENTS, INC.
014 B000001 8-14716
015 A000001 INVESTORS BANK & TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02116
015 E010001 X
018 000000 Y
019 A000000 Y
019 B000000 10
019 C000000 ALLMEFUNDS
020 C000001 0
020 C000002 0
020 C000003 0
020 C000004 0
020 C000005 0
020 C000006 0
020 C000007 0
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 0
022 A000001 STATE STREET GLOBAL MARKETS, LLC
022 B000001 04-3464336
022 C000001 7552
022 D000001 8170
022 A000002 GOLDMAN SACHS & CO.
022 B000002 13-5108880
022 C000002 4880
022 D000002 1714
022 A000003 MORGAN STANLEY & CO., INC.
022 B000003 13-2655998
022 C000003 2750
022 D000003 3723
022 A000004 BANC OF AMERICA SECURITIES LLC
022 B000004 56-2058405
022 C000004 1303
022 D000004 2398
022 A000005 MERRILL LYNCH, PIERCE, FENNER & SMITH
022 B000005 13-5674085
022 C000005 1964
022 D000005 1005
022 A000006 CHASE INVESTMENT SERVICES CORP.
022 B000006 13-3538956
022 C000006 375
022 D000006 2095
022 A000007 CITIGROUP GLOBAL MARKETS, INC.
PAGE 3
022 B000007 13-3214963
022 C000007 1333
022 D000007 584
022 A000008 HSBC SECURITIES (USA), INC.
022 B000008 13-2650272
022 C000008 1082
022 D000008 653
022 A000009 CREDIT SUISSE FIRST BOSTON CORP.
022 B000009 13-5659485
022 C000009 500
022 D000009 1148
022 A000010 BEAR STEARNS & CO., INC.
022 B000010 13-3299429
022 C000010 1178
022 D000010 0
023 C000000 24352
023 D000000 22474
024 000000 Y
025 A000001 MORGAN STANLEY & CO., INC.
025 B000001 13-2655998
025 C000001 D
025 D000001 2107
025 A000002 BEAR STEARNS & CO., INC.
025 B000002 13-3299429
025 C000002 D
025 D000002 1411
025 A000003 BANC OF AMERICA SECURITIES LLC
025 B000003 56-2058405
025 C000003 D
025 D000003 1340
025 A000004 GOLDMAN SACHS & CO.
025 B000004 13-5108880
025 C000004 D
025 D000004 996
025 A000005 CITIGROUP GLOBAL MARKETS, INC.
025 B000005 13-3214963
025 C000005 D
025 D000005 871
025 A000006 HSBC SECURITIES (USA), INC.
025 B000006 13-2650272
025 C000006 D
025 D000006 419
025 D000007 0
025 D000008 0
025 D000009 0
025 D000010 0
025 D000011 0
025 D000012 0
025 D000013 0
025 D000014 0
025 D000015 0
PAGE 4
025 D000016 0
026 A000000 Y
026 B000000 N
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 N
028 A010000 0
028 A020000 0
028 A030000 0
028 A040000 0
028 B010000 0
028 B020000 0
028 B030000 0
028 B040000 0
028 C010000 0
028 C020000 0
028 C030000 0
028 C040000 0
028 D010000 0
028 D020000 0
028 D030000 0
028 D040000 0
028 E010000 0
028 E020000 0
028 E030000 0
028 E040000 0
028 F010000 0
028 F020000 0
028 F030000 0
028 F040000 0
028 G010000 0
028 G020000 0
028 G030000 0
028 G040000 0
028 H000000 0
030 A000000 0
030 B000000 0.00
030 C000000 0.00
031 A000000 0
031 B000000 0
032 000000 0
033 000000 0
035 000000 0
036 B000000 0
038 000000 0
042 A000000 0
PAGE 5
042 B000000 0
042 C000000 0
042 D000000 0
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 0
044 000000 0
045 000000 Y
046 000000 N
047 000000 N
048 000000 0.000
048 A010000 0
048 A020000 0.000
048 B010000 0
048 B020000 0.000
048 C010000 0
048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 0
048 K020000 0.000
049 000000 N
050 000000 Y
051 000000 N
052 000000 N
053 A000000 N
054 A000000 Y
054 B000000 N
054 C000000 N
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 Y
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
PAGE 6
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 Y
055 A000000 N
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 0
062 A000000 Y
062 B000000 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 5.1
062 M000000 0.0
062 N000000 3.5
062 O000000 0.8
062 P000000 70.1
062 Q000000 19.1
062 R000000 0.0
063 A000000 0
063 B000000 8.5
064 A000000 N
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 Y
070 E020000 N
070 F010000 N
PAGE 7
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 N
070 N010000 Y
070 N020000 Y
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 16800
071 B000000 16788
071 C000000 89522
071 D000000 19
072 A000000 6
072 B000000 2429
072 C000000 0
072 D000000 0
072 E000000 2
072 F000000 204
072 G000000 0
072 H000000 0
072 I000000 37
072 J000000 35
072 K000000 0
072 L000000 21
072 M000000 10
072 N000000 0
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 16
072 S000000 5
072 T000000 0
072 U000000 0
072 V000000 0
PAGE 8
072 W000000 6
072 X000000 334
072 Y000000 0
072 Z000000 2097
072AA000000 0
072BB000000 47
072CC010000 0
072CC020000 2301
072DD010000 2320
072DD020000 0
072EE000000 0
073 A010000 0.2700
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 23
074 B000000 0
074 C000000 4469
074 D000000 83156
074 E000000 0
074 F000000 0
074 G000000 0
074 H000000 0
074 I000000 2747
074 J000000 0
074 K000000 0
074 L000000 1316
074 M000000 0
074 N000000 91711
074 O000000 0
074 P000000 35
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 2788
074 S000000 0
074 T000000 88888
074 U010000 8592
074 U020000 0
074 V010000 10.35
074 V020000 0.00
074 W000000 0.0000
074 X000000 8606
074 Y000000 0
075 A000000 0
075 B000000 91086
076 000000 8.85
077 A000000 Y
077 B000000 N
077 C000000 Y
PAGE 9
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078 000000 N
080 C000000 0
081 A000000 N
081 B000000 0
082 A000000 N
082 B000000 0
083 B000000 0
084 B000000 0
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
087 A010000 ALLMERICA SECURITIES TRUST
087 A020000 019921105
087 A030000 ALM
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE GEORGE BOYD
TITLE LEGAL COUNSEL