<PAGE> PAGE 1
000 A000000 06/30/99
000 C000000 0000093730
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
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
003 000000 N
004 000000 N
005 000000 N
006 000000 N
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007 C011800 18
007 C011900 19
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008 A000001 ALLMERICA ASSET 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
<PAGE> PAGE 2
010 C010001 BOSTON
010 C020001 MA
010 C030001 02116
010 A000002 FIRST DATA INVESTOR SERVICES GROUP, INC.
010 B000002 84-1761
010 C010002 WESTBOROUGH
010 C020002 MA
010 C030002 01581
012 A000001 THE BANK OF NEW YORK
012 B000001 84-0000000
012 C010001 NEW YORK
012 C020001 NY
012 C030001 10286
013 A000001 PRICEWATERHOUSECOOPERS, LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02109
014 A000001 ALLMERICA INVESTMENTS, INC.
014 B000001 8-14716
015 A000001 INVESTOR 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 15
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 BANK
022 B000001 04-1867445
022 C000001 10876
022 D000001 8754
022 A000002 MORGAN STANLEY
022 B000002 13-2655998
022 C000002 3010
022 D000002 3574
022 A000003 J.P. MORGAN & CO., INC.
022 B000003 13-3224016
022 C000003 3231
<PAGE> PAGE 3
022 D000003 2228
022 A000004 GOLDMAN SACHS & CO.
022 B000004 13-5108880
022 C000004 2478
022 D000004 1452
022 A000005 HSBC SECURITIES
022 B000005 13-2650272
022 C000005 1110
022 D000005 2672
022 A000006 DONALDSON, LUFKIN & JENRETTE, INC.
022 B000006 13-2741729
022 C000006 3500
022 D000006 0
022 A000007 CREDIT SUISSE FIRST BOSTON
022 B000007 13-5659485
022 C000007 0
022 D000007 2244
022 A000008 BEAR STEARNS COS., INC
022 B000008 13-4946705
022 C000008 994
022 D000008 0
022 A000009 PAINE WEBBER INC.
022 B000009 13-2638166
022 C000009 0
022 D000009 251
022 C000010 0
022 D000010 0
023 C000000 25199
023 D000000 21175
024 000000 Y
025 A000001 DONALDSON LUFKIN & JENRETTE, INC.
025 B000001 13-2741729
025 C000001 D
025 D000001 986
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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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
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 SECRETARY
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial
information extracted from Allmerica
from form N-SAR for the period ended June 30, 1999
and is qualified in its entirety by reference
to such financial statements.
</LEGEND>
<SERIES>
<NUMBER> 1
<NAME> Allmerica Securities Trust
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 95,493,631
<INVESTMENTS-AT-VALUE> 95,478,159
<RECEIVABLES> 2,381,645
<ASSETS-OTHER> 920
<OTHER-ITEMS-ASSETS> 12,486,088
<TOTAL-ASSETS> 110,346,812
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 12,653,898
<TOTAL-LIABILITIES> 12,653,898
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 97,037,349
<SHARES-COMMON-STOCK> 8,592,306
<SHARES-COMMON-PRIOR> 8,592,306
<ACCUMULATED-NII-CURRENT> 119,014
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 552,023
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (15,472)
<NET-ASSETS> 97,692,914
<DIVIDEND-INCOME> 11,932
<INTEREST-INCOME> 3,883,150
<OTHER-INCOME> 0
<EXPENSES-NET> 380,314
<NET-INVESTMENT-INCOME> 3,514,768
<REALIZED-GAINS-CURRENT> 829,397
<APPREC-INCREASE-CURRENT> (5,984,493)
<NET-CHANGE-FROM-OPS> (1,640,328)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,436,922)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (5,077,250)
<ACCUMULATED-NII-PRIOR> 41,168
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (277,374)
<GROSS-ADVISORY-FEES> 246,480
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 380,314
<AVERAGE-NET-ASSETS> 100,316,487
<PER-SHARE-NAV-BEGIN> 11.96
<PER-SHARE-NII> 0.41
<PER-SHARE-GAIN-APPREC> (0.60)
<PER-SHARE-DIVIDEND> (0.40)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.37
<EXPENSE-RATIO> 0.76
</TABLE>
