<PAGE> PAGE 1
000 B000000 04/30/98
000 C000000 0000918572
000 D000000 N
000 E000000 F
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 U
001 A000000 STATE STREET RESEARCH SECURITIES TRUST
001 B000000 811-8322
001 C000000 6173577800
002 A000000 ONE FINANCIAL CENTER
002 B000000 BOSTON
002 C000000 MA
002 D010000 02111
002 D020000 2690
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 4
007 C010100 1
007 C020100 STATE STREET RESEARCH INTERMEDIATE BOND FUND
007 C030100 Y
007 C010200 2
007 C020200 STATE STREET RESEARCH STRATEGIC INCOME FUND
007 C030200 N
007 C010300 3
007 C020300 STATE STREET RESEARCH GALILEO FUND
007 C030300 N
007 C010400 4
007 C020400 STATE STREET RESEARCH LEGACY FUND
007 C030400 N
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 23
019 C00AA00 STATESTRES
020 A000001 AUTRANET INC.
020 B000001 13-2961507
020 C000001 14
020 A000002 ABEL/NOSER CORP.
020 B000002 13-2833083
020 C000002 7
<PAGE> PAGE 2
020 A000003 INSTINET CORP.
020 B000003 13-3443395
020 C000003 3
020 A000004 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
020 B000004 13-5674085
020 C000004 2
020 A000005 LAZARD FREES & CO.
020 B000005 13-5545100
020 C000005 1
020 A000006 HSBC JAMES CAPEL INC.
020 C000006 1
020 A000007 CREDIT SUISSE FIRST BOSTON CORP.
020 B000007 13-5659485
020 C000007 0
020 A000008 NATIONSBANK MONTGOMERY SECURITIES
020 B000008 94-1701676
020 C000008 0
020 A000009 LYNCH, JONES & RYAN INC.
020 B000009 13-3356934
020 C000009 0
020 A000010 CJ LAWRENCE/DEUTSCHE BANK
020 C000010 0
021 000000 31
022 A000001 AMERICAN EXPRESS CREDIT CORP.
022 C000001 164162
022 D000001 0
022 A000002 FORD MOTOR CREDIT CORP.
022 C000002 103613
022 D000002 0
022 A000003 MERRILL LYNCH. PIERCE, FENNER & SMITH INC.
022 B000003 13-5674085
022 C000003 101256
022 D000003 0
022 A000004 GENERAL ELECTRIC CAPITAL CORP.
022 C000004 31569
022 D000004 0
022 A000005 STATE STREET BOSTON CORP.
022 B000005 04-1867445
022 C000005 23681
022 D000005 0
022 A000006 CHEVRON OIL FINANCE CO.
022 C000006 23123
022 D000006 0
022 A000007 FIRST BOSTON CORP.
022 C000007 23058
022 D000007 0
022 A000008 CS FIRST BOSTON CORP
022 B000008 13-5659485
022 C000008 15001
022 D000008 0
022 A000009 HOUSEHOLD FINANCE CORP.
<PAGE> PAGE 3
022 C000009 9943
022 D000009 0
022 A000010 ASSOCIATES CORP. OF NORTH AMERICA
022 C000010 8087
022 D000010 0
023 C000000 551790
023 D000000 0
024 00AA00 Y
025 A00AA01 LEHMAN BROTHERS INC.
025 B00AA01 13-2518466
025 C00AA01 D
025 D00AA01 4331
025 D00AA02 0
025 D00AA03 0
025 D00AA04 0
025 D00AA05 0
025 D00AA06 0
025 D00AA07 0
025 D00AA08 0
026 A000000 Y
026 B000000 Y
026 C000000 Y
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
077 A000000 Y
077 B000000 Y
077 C000000 N
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 Q010000 N
077 Q020000 N
077 Q030000 N
078 000000 N
080 A00AA00 FEDERAL INSURANCE CO.
080 C00AA00 25000
081 A00AA00 Y
081 B00AA00 25
<PAGE> PAGE 4
082 A00AA00 N
082 B00AA00 0
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
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
028 A010100 94
028 A020100 0
028 A030100 0
028 A040100 36
028 B010100 270
028 B020100 54
028 B030100 0
028 B040100 417
028 C010100 16
028 C020100 0
028 C030100 0
028 C040100 55
028 D010100 70
028 D020100 0
028 D030100 0
028 D040100 7
028 E010100 21
028 E020100 0
028 E030100 0
028 E040100 67
028 F010100 52
028 F020100 46
028 F030100 0
028 F040100 19
028 G010100 523
028 G020100 100
028 G030100 0
028 G040100 601
028 H000100 0
029 000100 N
030 A000100 0
<PAGE> PAGE 5
030 B000100 0.00
030 C000100 0.00
031 A000100 0
031 B000100 0
032 000100 0
033 000100 0
034 000100 N
035 000100 0
036 B000100 0
037 000100 N
038 000100 0
039 000100 N
040 000100 Y
041 000100 N
042 A000100 0
042 B000100 0
042 C000100 0
042 D000100 0
042 E000100 0
042 F000100 0
042 G000100 0
042 H000100 0
043 000100 0
044 000100 0
045 000100 Y
046 000100 N
047 000100 Y
048 000100 0.650
048 A010100 0
048 A020100 0.000
048 B010100 0
048 B020100 0.000
048 C010100 0
048 C020100 0.000
048 D010100 0
048 D020100 0.000
048 E010100 0
048 E020100 0.000
048 F010100 0
048 F020100 0.000
048 G010100 0
048 G020100 0.000
048 H010100 0
048 H020100 0.000
048 I010100 0
048 I020100 0.000
048 J010100 0
048 J020100 0.000
048 K010100 0
048 K020100 0.000
049 000100 N
<PAGE> PAGE 6
050 000100 N
051 000100 N
052 000100 N
053 A000100 Y
053 B000100 Y
053 C000100 N
054 A000100 Y
054 B000100 Y
054 C000100 N
054 D000100 N
054 E000100 N
054 F000100 N
054 G000100 Y
054 H000100 Y
054 I000100 N
054 J000100 Y
054 K000100 N
054 L000100 N
054 M000100 Y
054 N000100 N
054 O000100 N
062 A000100 Y
062 B000100 0.0
062 C000100 0.0
062 D000100 0.0
062 E000100 0.0
062 F000100 0.0
062 G000100 0.0
062 H000100 0.0
062 I000100 4.3
062 J000100 0.0
062 K000100 0.0
062 L000100 1.2
062 M000100 38.2
062 N000100 4.7
062 O000100 0.0
062 P000100 49.7
062 Q000100 1.9
062 R000100 0.0
063 A000100 0
063 B000100 5.8
064 A000100 N
064 B000100 N
066 A000100 N
067 000100 N
068 A000100 N
068 B000100 N
069 000100 N
071 A000100 17950
071 B000100 17496
071 C000100 16267
<PAGE> PAGE 7
071 D000100 108
072 A000100 12
072 B000100 1150
072 C000100 0
072 D000100 0
072 E000100 0
072 F000100 94
072 G000100 0
072 H000100 0
072 I000100 10
072 J000100 62
072 K000100 0
072 L000100 22
072 M000100 20
072 N000100 19
072 O000100 0
072 P000100 0
072 Q000100 0
072 R000100 20
072 S000100 4
072 T000100 0
072 U000100 18
072 V000100 0
072 W000100 6
072 X000100 275
072 Y000100 147
072 Z000100 1022
072AA000100 149
072BB000100 0
072CC010100 250
072CC020100 0
072DD010100 1020
072DD020100 0
072EE000100 0
073 A010100 0.5800
073 A020100 0.0000
073 B000100 0.0000
073 C000100 0.0000
074 A000100 9
074 B000100 0
074 C000100 735
074 D000100 16215
074 E000100 0
074 F000100 0
074 G000100 0
074 H000100 0
074 I000100 1584
074 J000100 0
074 K000100 16
074 L000100 226
074 M000100 29
<PAGE> PAGE 8
074 N000100 18814
074 O000100 0
074 P000100 20
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 1640
074 S000100 0
074 T000100 17154
074 U010100 1757
074 U020100 0
074 V010100 9.76
074 V020100 0.00
074 W000100 0.0000
074 X000100 7
074 Y000100 0
075 A000100 0
075 B000100 17097
076 000100 0.00
028 A010200 2617
028 A020200 169
028 A030200 0
028 A040200 646
028 B010200 3358
028 B020200 1151
028 B030200 0
028 B040200 1175
028 C010200 5515
028 C020200 306
028 C030200 0
028 C040200 1084
028 D010200 4334
028 D020200 199
028 D030200 0
028 D040200 1826
028 E010200 3628
028 E020200 213
028 E030200 0
028 E040200 7631
028 F010200 3653
028 F020200 281
028 F030200 0
028 F040200 1657
028 G010200 23105
028 G020200 2319
028 G030200 0
028 G040200 14019
028 H000200 4999
029 000200 Y
030 A000200 316
<PAGE> PAGE 9
030 B000200 4.50
030 C000200 0.00
031 A000200 43
031 B000200 0
032 000200 66
033 000200 207
034 000200 Y
035 000200 47
036 A000200 N
036 B000200 0
037 000200 N
038 000200 0
039 000200 N
040 000200 Y
041 000200 Y
042 A000200 8
042 B000200 2
042 C000200 0
042 D000200 65
042 E000200 17
042 F000200 0
042 G000200 8
042 H000200 0
043 000200 501
044 000200 316
045 000200 Y
046 000200 N
047 000200 Y
048 000200 0.650
048 A010200 0
048 A020200 0.000
048 B010200 0
048 B020200 0.000
048 C010200 0
048 C020200 0.000
048 D010200 0
048 D020200 0.000
048 E010200 0
048 E020200 0.000
048 F010200 0
048 F020200 0.000
048 G010200 0
048 G020200 0.000
048 H010200 0
048 H020200 0.000
048 I010200 0
048 I020200 0.000
048 J010200 0
048 J020200 0.000
048 K010200 0
048 K020200 0.000
<PAGE> PAGE 10
049 000200 N
050 000200 N
051 000200 N
052 000200 N
053 A000200 Y
053 B000200 Y
053 C000200 N
054 A000200 Y
054 B000200 Y
054 C000200 N
054 D000200 N
054 E000200 N
054 F000200 N
054 G000200 Y
054 H000200 Y
054 I000200 N
054 J000200 Y
054 K000200 N
054 L000200 N
054 M000200 Y
054 N000200 N
054 O000200 N
062 A000200 Y
062 B000200 0.0
062 C000200 0.0
062 D000200 0.0
062 E000200 0.0
062 F000200 0.0
062 G000200 0.0
062 H000200 0.0
062 I000200 3.1
062 J000200 0.0
062 K000200 0.0
062 L000200 0.0
062 M000200 18.9
062 N000200 8.8
062 O000200 0.0
062 P000200 58.1
062 Q000200 8.2
062 R000200 2.9
063 A000200 0
063 B000200 7.5
064 A000200 N
064 B000200 N
066 A000200 N
067 000200 N
068 A000200 N
068 B000200 N
069 000200 N
071 A000200 188597
071 B000200 161883
<PAGE> PAGE 11
071 C000200 90025
071 D000200 180
072 A000200 12
072 B000200 7940
072 C000200 257
072 D000200 0
072 E000200 0
072 F000200 694
072 G000200 0
072 H000200 0
072 I000200 97
072 J000200 158
072 K000200 0
072 L000200 51
072 M000200 17
072 N000200 41
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 22
072 S000200 14
072 T000200 501
072 U000200 16
072 V000200 0
072 W000200 11
072 X000200 1622
072 Y000200 104
072 Z000200 6679
072AA000200 3168
072BB000200 0
072CC010200 1289
072CC020200 0
072DD010200 6766
072DD020200 0
072EE000200 1440
073 A010200 0.5700
073 A020200 0.5000
073 B000200 0.1100
073 C000200 0.0000
074 A000200 0
074 B000200 0
074 C000200 3209
074 D000200 100402
074 E000200 0
074 F000200 3006
074 G000200 0
074 H000200 0
074 I000200 15944
074 J000200 2037
074 K000200 21
074 L000200 2529
<PAGE> PAGE 12
074 M000200 60
074 N000200 127208
074 O000200 6411
074 P000200 153
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 16945
074 S000200 0
074 T000200 103699
074 U010200 14169
074 U020200 0
074 V010200 7.33
074 V020200 7.31
074 W000200 0.0000
074 X000200 2671
074 Y000200 0
075 A000200 0
075 B000200 92510
076 000200 0.00
028 A010300 0
028 A020300 0
028 A030300 0
028 A040300 0
028 B010300 0
028 B020300 0
028 B030300 0
028 B040300 0
028 C010300 0
028 C020300 0
028 C030300 0
028 C040300 0
028 D010300 0
028 D020300 0
028 D030300 0
028 D040300 0
028 E010300 7713
028 E020300 0
028 E030300 0
028 E040300 0
028 F010300 9488
028 F020300 0
028 F030300 0
028 F040300 394
028 G010300 17201
028 G020300 0
028 G030300 0
028 G040300 394
028 H000300 3027
029 000300 Y
<PAGE> PAGE 13
030 A000300 74
030 B000300 4.50
030 C000300 0.00
031 A000300 9
031 B000300 0
032 000300 36
033 000300 29
034 000300 N
035 000300 0
036 B000300 0
037 000300 N
038 000300 0
039 000300 N
040 000300 Y
041 000300 Y
042 A000300 5
042 B000300 25
042 C000300 0
042 D000300 20
042 E000300 40
042 F000300 0
042 G000300 10
042 H000300 0
043 000300 5
044 000300 0
062 A000300 N
062 B000300 0.0
062 C000300 0.0
062 D000300 0.0
062 E000300 0.0
062 F000300 0.0
062 G000300 0.0
062 H000300 0.0
062 I000300 0.0
062 J000300 0.0
062 K000300 0.0
062 L000300 0.0
062 M000300 0.0
062 N000300 0.0
062 O000300 0.0
062 P000300 0.0
062 Q000300 0.0
062 R000300 0.0
063 A000300 0
063 B000300 0.0
066 A000300 Y
066 B000300 N
066 C000300 N
066 D000300 Y
066 E000300 N
066 F000300 N
<PAGE> PAGE 14
066 G000300 N
067 000300 N
068 A000300 N
068 B000300 N
069 000300 N
071 A000300 15544
071 B000300 976
071 C000300 7484
071 D000300 13
072 A000300 2
072 B000300 13
072 C000300 13
072 D000300 0
072 E000300 0
072 F000300 9
072 G000300 0
072 H000300 0
072 I000300 4
072 J000300 11
072 K000300 0
072 L000300 4
072 M000300 5
072 N000300 5
072 O000300 0
072 P000300 0
072 Q000300 0
072 R000300 7
072 S000300 1
072 T000300 5
072 U000300 2
072 V000300 0
072 W000300 0
072 X000300 53
072 Y000300 34
072 Z000300 7
072AA000300 0
072BB000300 2
072CC010300 286
072CC020300 0
072DD010300 0
072DD020300 0
072EE000300 0
073 A010300 0.0000
073 A020300 0.0000
073 B000300 0.0000
073 C000300 0.0000
074 A000300 39
074 B000300 0
074 C000300 1418
074 D000300 0
074 E000300 0
<PAGE> PAGE 15
074 F000300 14852
074 G000300 0
074 H000300 0
074 I000300 0
074 J000300 0
074 K000300 35
074 L000300 760
074 M000300 91
074 N000300 17195
074 O000300 39
074 P000300 0
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 0
074 R040300 58
074 S000300 0
074 T000300 17098
074 U010300 1725
074 U020300 1725
074 V010300 9.92
074 V020300 9.90
074 W000300 0.0000
074 X000300 1674
074 Y000300 0
075 A000300 0
075 B000300 10274
076 000300 0.00
028 A010400 0
028 A020400 0
028 A030400 0
028 A040400 0
028 B010400 0
028 B020400 0
028 B030400 0
028 B040400 0
028 C010400 1426
028 C020400 0
028 C030400 0
028 C040400 0
028 D010400 13794
028 D020400 0
028 D030400 0
028 D040400 214
028 E010400 12292
028 E020400 0
028 E030400 0
028 E040400 53
028 F010400 11096
028 F020400 0
028 F030400 0
<PAGE> PAGE 16
028 F040400 180
028 G010400 38608
028 G020400 0
028 G030400 0
028 G040400 447
028 H000400 8100
029 000400 Y
030 A000400 156
030 B000400 4.50
030 C000400 0.00
031 A000400 19
031 B000400 0
032 000400 77
033 000400 60
034 000400 N
035 000400 0
036 B000400 0
037 000400 N
038 000400 0
039 000400 N
040 000400 Y
041 000400 Y
042 A000400 14
042 B000400 1
042 C000400 0
042 D000400 14
042 E000400 52
042 F000400 0
042 G000400 19
042 H000400 0
043 000400 36
044 000400 111
062 A000400 N
062 B000400 0.0
062 C000400 0.0
062 D000400 0.0
062 E000400 0.0
062 F000400 0.0
062 G000400 0.0
062 H000400 0.0
062 I000400 0.0
062 J000400 0.0
062 K000400 0.0
062 L000400 0.0
062 M000400 0.0
062 N000400 0.0
062 O000400 0.0
062 P000400 0.0
062 Q000400 0.0
062 R000400 0.0
066 A000400 Y
<PAGE> PAGE 17
066 B000400 N
066 C000400 N
066 D000400 Y
066 E000400 N
066 F000400 N
066 G000400 N
067 000400 N
068 A000400 N
068 B000400 N
069 000400 N
071 A000400 37581
071 B000400 1063
071 C000400 16517
071 D000400 6
072 A000400 4
072 B000400 42
072 C000400 37
072 D000400 0
072 E000400 0
072 F000400 39
072 G000400 0
072 H000400 0
072 I000400 16
072 J000400 28
072 K000400 0
072 L000400 8
072 M000400 8
072 N000400 11
072 O000400 0
072 P000400 0
072 Q000400 0
072 R000400 15
072 S000400 2
072 T000400 36
072 U000400 5
072 V000400 0
072 W000400 3
072 X000400 171
072 Y000400 76
072 Z000400 -16
072AA000400 69
072BB000400 0
072CC010400 2562
072CC020400 0
072DD010400 0
072DD020400 0
072EE000400 0
073 A010400 0.0000
073 A020400 0.0000
073 B000400 0.0000
073 C000400 0.0000
<PAGE> PAGE 18
074 A000400 11
074 B000400 0
074 C000400 1599
074 D000400 0
074 E000400 0
074 F000400 39149
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 0
074 K000400 39
074 L000400 1260
074 M000400 78
074 N000400 42136
074 O000400 1180
074 P000400 0
074 Q000400 0
074 R010400 0
074 R020400 0
074 R030400 0
074 R040400 181
074 S000400 0
074 T000400 40775
074 U010400 3501
074 U020400 0
074 V010400 11.68
074 V020400 11.63
074 W000400 0.0000
074 X000400 2791
074 Y000400 0
075 A000400 0
075 B000400 18183
076 000400 0.00
SIGNATURE DOUGLAS A. ROMICH
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 021
<NAME> STATE STREET RESEARCH STRATEGIC INCOME FUND CLASS A
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 122,008,758
<INVESTMENTS-AT-VALUE> 122,560,678
<RECEIVABLES> 4,587,033
<ASSETS-OTHER> 60,438
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 127,208,149
<PAYABLE-FOR-SECURITIES> 6,411,174
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 17,098,292
<TOTAL-LIABILITIES> 23,509,466
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 101,047,371
<SHARES-COMMON-STOCK> 5,643,672
<SHARES-COMMON-PRIOR> 5,115,405
<ACCUMULATED-NII-CURRENT> 724,718
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,243,762
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 682,832
<NET-ASSETS> 103,698,683
<DIVIDEND-INCOME> 257,333
<INTEREST-INCOME> 7,940,496
<OTHER-INCOME> 0
<EXPENSES-NET> 1,518,717
<NET-INVESTMENT-INCOME> 6,679,112
<REALIZED-GAINS-CURRENT> 3,167,777
<APPREC-INCREASE-CURRENT> 1,289,060
<NET-CHANGE-FROM-OPS> 11,135,949
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,130,569)
<DISTRIBUTIONS-OF-GAINS> (648,291)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,831,188
<NUMBER-OF-SHARES-REDEEMED> (1,501,194)
<SHARES-REINVESTED> 198,273
<NET-CHANGE-IN-ASSETS> 28,412,106
<ACCUMULATED-NII-PRIOR> 150,952
<ACCUMULATED-GAINS-PRIOR> 149,838
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 693,828
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,622,157
<AVERAGE-NET-ASSETS> 92,510,400
<PER-SHARE-NAV-BEGIN> 7.06
<PER-SHARE-NII> 0.55
<PER-SHARE-GAIN-APPREC> 0.38
<PER-SHARE-DIVIDEND> (0.55)
<PER-SHARE-DISTRIBUTIONS> (0.11)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.33
<EXPENSE-RATIO> 1.35
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 022
<NAME> STATE STREET RESEARCH STRATEGIC INCOME FUND CLASS B
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 122,008,758
<INVESTMENTS-AT-VALUE> 122,560,678
<RECEIVABLES> 4,587,033
<ASSETS-OTHER> 60,438
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 127,208,149
<PAYABLE-FOR-SECURITIES> 6,411,174
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 17,098,292
<TOTAL-LIABILITIES> 23,509,466
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 101,047,371
<SHARES-COMMON-STOCK> 5,120,654
<SHARES-COMMON-PRIOR> 2,792,908
<ACCUMULATED-NII-CURRENT> 724,718
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,243,762
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 682,832
<NET-ASSETS> 103,698,683
<DIVIDEND-INCOME> 257,333
<INTEREST-INCOME> 7,940,496
<OTHER-INCOME> 0
<EXPENSES-NET> 1,518,717
<NET-INVESTMENT-INCOME> 6,679,112
<REALIZED-GAINS-CURRENT> 3,167,777
<APPREC-INCREASE-CURRENT> 1,289,060
<NET-CHANGE-FROM-OPS> 11,135,949
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,958,332)
<DISTRIBUTIONS-OF-GAINS> (436,211)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,029,126
<NUMBER-OF-SHARES-REDEEMED> (879,529)
<SHARES-REINVESTED> 178,149
<NET-CHANGE-IN-ASSETS> 28,412,106
<ACCUMULATED-NII-PRIOR> 150,952
<ACCUMULATED-GAINS-PRIOR> 149,838
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 693,828
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,622,157
<AVERAGE-NET-ASSETS> 92,510,400
<PER-SHARE-NAV-BEGIN> 7.05
<PER-SHARE-NII> 0.49
<PER-SHARE-GAIN-APPREC> 0.38
<PER-SHARE-DIVIDEND> (0.50)
<PER-SHARE-DISTRIBUTIONS> (0.11)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.31
<EXPENSE-RATIO> 2.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 024
<NAME> STATE STREET RESEARCH STRATEGIC INCOME FUND CLASS C
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 122,008,758
<INVESTMENTS-AT-VALUE> 122,560,678
<RECEIVABLES> 4,587,033
<ASSETS-OTHER> 60,438
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 127,208,149
<PAYABLE-FOR-SECURITIES> 6,411,174
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 17,098,292
<TOTAL-LIABILITIES> 23,509,466
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 101,047,371
<SHARES-COMMON-STOCK> 1,811,375
<SHARES-COMMON-PRIOR> 1,219,128
<ACCUMULATED-NII-CURRENT> 724,718
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,243,762
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 682,832
<NET-ASSETS> 103,698,683
<DIVIDEND-INCOME> 257,333
<INTEREST-INCOME> 7,940,496
<OTHER-INCOME> 0
<EXPENSES-NET> 1,518,717
<NET-INVESTMENT-INCOME> 6,679,112
<REALIZED-GAINS-CURRENT> 3,167,777
<APPREC-INCREASE-CURRENT> 1,289,060
<NET-CHANGE-FROM-OPS> 11,135,949
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (778,492)
<DISTRIBUTIONS-OF-GAINS> (179,325)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 837,933
<NUMBER-OF-SHARES-REDEEMED> (286,313)
<SHARES-REINVESTED> 40,627
<NET-CHANGE-IN-ASSETS> 28,412,106
<ACCUMULATED-NII-PRIOR> 150,952
<ACCUMULATED-GAINS-PRIOR> 149,838
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 693,828
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,622,157
<AVERAGE-NET-ASSETS> 92,510,400
<PER-SHARE-NAV-BEGIN> 7.05
<PER-SHARE-NII> 0.49
<PER-SHARE-GAIN-APPREC> 0.38
<PER-SHARE-DIVIDEND> (0.50)
<PER-SHARE-DISTRIBUTIONS> (0.11)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.31
<EXPENSE-RATIO> 2.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 023
<NAME> STATE STREET RESEARCH STRATEGIC INCOME FUND CLASS S
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 122,008,758
<INVESTMENTS-AT-VALUE> 122,560,678
<RECEIVABLES> 4,587,033
<ASSETS-OTHER> 60,438
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 127,208,149
<PAYABLE-FOR-SECURITIES> 6,411,174
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 17,098,292
<TOTAL-LIABILITIES> 23,509,466
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 101,047,371
<SHARES-COMMON-STOCK> 1,593,399
<SHARES-COMMON-PRIOR> 1,545,163
<ACCUMULATED-NII-CURRENT> 724,718
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 1,243,762
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 682,832
<NET-ASSETS> 103,698,683
<DIVIDEND-INCOME> 257,333
<INTEREST-INCOME> 7,940,496
<OTHER-INCOME> 0
<EXPENSES-NET> 1,518,717
<NET-INVESTMENT-INCOME> 6,679,112
<REALIZED-GAINS-CURRENT> 3,167,777
<APPREC-INCREASE-CURRENT> 1,289,060
<NET-CHANGE-FROM-OPS> 11,135,949
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (898,928)
<DISTRIBUTIONS-OF-GAINS> (176,107)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 21,859
<NUMBER-OF-SHARES-REDEEMED> (18,351)
<SHARES-REINVESTED> 44,728
<NET-CHANGE-IN-ASSETS> 28,412,106
<ACCUMULATED-NII-PRIOR> 150,952
<ACCUMULATED-GAINS-PRIOR> 149,838
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 693,828
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,622,157
<AVERAGE-NET-ASSETS> 92,510,400
<PER-SHARE-NAV-BEGIN> 7.06
<PER-SHARE-NII> 0.57
<PER-SHARE-GAIN-APPREC> 0.38
<PER-SHARE-DIVIDEND> (0.57)
<PER-SHARE-DISTRIBUTIONS> (0.11)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.33
<EXPENSE-RATIO> 1.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 031
<NAME> STATE STREET RESEARCH GALILEO FUND CLASS A
<S> <C>
<PERIOD-TYPE> 2-MOS
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 15,983,330
<INVESTMENTS-AT-VALUE> 16,269,687
<RECEIVABLES> 794,599
<ASSETS-OTHER> 130,469
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 17,194,755
<PAYABLE-FOR-SECURITIES> 38,641
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 57,771
<TOTAL-LIABILITIES> 96,412
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,804,691
<SHARES-COMMON-STOCK> 618,158
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 9,454
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (2,159)
<ACCUM-APPREC-OR-DEPREC> 286,357
<NET-ASSETS> 17,098,343
<DIVIDEND-INCOME> 12,892
<INTEREST-INCOME> 13,018
<OTHER-INCOME> 0
<EXPENSES-NET> 18,711
<NET-INVESTMENT-INCOME> 7,199
<REALIZED-GAINS-CURRENT> (2,159)
<APPREC-INCREASE-CURRENT> 286,357
<NET-CHANGE-FROM-OPS> 291,397
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 622,025
<NUMBER-OF-SHARES-REDEEMED> (3,867)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 17,098,343
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,148
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 53,425
<AVERAGE-NET-ASSETS> 10,273,908
<PER-SHARE-NAV-BEGIN> 9.55
<PER-SHARE-NII> 0.01
<PER-SHARE-GAIN-APPREC> 0.36
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.92
<EXPENSE-RATIO> 1.25
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 032
<NAME> STATE STREET RESEARCH GALILEO FUND CLASS B
<S> <C>
<PERIOD-TYPE> 2-MOS
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 15,983,330
<INVESTMENTS-AT-VALUE> 16,269,687
<RECEIVABLES> 794,599
<ASSETS-OTHER> 130,469
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 17,194,755
<PAYABLE-FOR-SECURITIES> 38,641
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 57,771
<TOTAL-LIABILITIES> 96,412
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,804,691
<SHARES-COMMON-STOCK> 519,235
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 9,454
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (2,159)
<ACCUM-APPREC-OR-DEPREC> 286,357
<NET-ASSETS> 17,098,343
<DIVIDEND-INCOME> 12,892
<INTEREST-INCOME> 13,018
<OTHER-INCOME> 0
<EXPENSES-NET> 18,711
<NET-INVESTMENT-INCOME> 7,199
<REALIZED-GAINS-CURRENT> (2,159)
<APPREC-INCREASE-CURRENT> 286,357
<NET-CHANGE-FROM-OPS> 291,397
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 555,377
<NUMBER-OF-SHARES-REDEEMED> (36,142)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 17,098,343
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,148
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 53,425
<AVERAGE-NET-ASSETS> 10,273,908
<PER-SHARE-NAV-BEGIN> 9.55
<PER-SHARE-NII> (0.00)
<PER-SHARE-GAIN-APPREC> 0.35
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.90
<EXPENSE-RATIO> 2.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 033
<NAME> STATE STREET RESEARCH GALILEO FUND CLASS S
<S> <C>
<PERIOD-TYPE> 2-MOS
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 15,983,330
<INVESTMENTS-AT-VALUE> 16,269,687
<RECEIVABLES> 794,599
<ASSETS-OTHER> 130,469
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 17,194,755
<PAYABLE-FOR-SECURITIES> 38,641
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 57,771
<TOTAL-LIABILITIES> 96,412
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,804,691
<SHARES-COMMON-STOCK> 480,088
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 9,454
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (2,159)
<ACCUM-APPREC-OR-DEPREC> 286,357
<NET-ASSETS> 17,098,343
<DIVIDEND-INCOME> 12,892
<INTEREST-INCOME> 13,018
<OTHER-INCOME> 0
<EXPENSES-NET> 18,711
<NET-INVESTMENT-INCOME> 7,199
<REALIZED-GAINS-CURRENT> (2,159)
<APPREC-INCREASE-CURRENT> 286,357
<NET-CHANGE-FROM-OPS> 291,397
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 480,088
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 17,098,343
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,148
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 53,425
<AVERAGE-NET-ASSETS> 10,273,908
<PER-SHARE-NAV-BEGIN> 9.55
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 0.35
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.92
<EXPENSE-RATIO> 1.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 034
<NAME> STATE STREET RESEARCH GALILEO FUND CLASS C
<S> <C>
<PERIOD-TYPE> 2-MOS
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 15,983,330
<INVESTMENTS-AT-VALUE> 16,269,687
<RECEIVABLES> 794,599
<ASSETS-OTHER> 130,469
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 17,194,755
<PAYABLE-FOR-SECURITIES> 38,641
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 57,771
<TOTAL-LIABILITIES> 96,412
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,804,691
<SHARES-COMMON-STOCK> 107,096
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 9,454
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (2,159)
<ACCUM-APPREC-OR-DEPREC> 286,357
<NET-ASSETS> 17,098,343
<DIVIDEND-INCOME> 12,892
<INTEREST-INCOME> 13,018
<OTHER-INCOME> 0
<EXPENSES-NET> 18,711
<NET-INVESTMENT-INCOME> 7,199
<REALIZED-GAINS-CURRENT> (2,159)
<APPREC-INCREASE-CURRENT> 286,357
<NET-CHANGE-FROM-OPS> 291,397
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 107,096
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 17,098,343
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 9,148
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 53,425
<AVERAGE-NET-ASSETS> 10,273,908
<PER-SHARE-NAV-BEGIN> 9.55
<PER-SHARE-NII> (0.00)
<PER-SHARE-GAIN-APPREC> 0.36
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.91
<EXPENSE-RATIO> 2.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 041
<NAME> STATE STREET RESEARCH LEGACY FUND CLASS A
<S> <C>
<PERIOD-TYPE> 4-MOS
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 38,185,915
<INVESTMENTS-AT-VALUE> 40,747,944
<RECEIVABLES> 1,299,502
<ASSETS-OTHER> 88,674
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 42,136,120
<PAYABLE-FOR-SECURITIES> 1,180,078
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 180,718
<TOTAL-LIABILITIES> 1,360,796
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 38,155,845
<SHARES-COMMON-STOCK> 1,027,449
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 57,450
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,562,029
<NET-ASSETS> 40,775,324
<DIVIDEND-INCOME> 36,889
<INTEREST-INCOME> 42,045
<OTHER-INCOME> 0
<EXPENSES-NET> 95,207
<NET-INVESTMENT-INCOME> (16,273)
<REALIZED-GAINS-CURRENT> 68,845
<APPREC-INCREASE-CURRENT> 2,562,029
<NET-CHANGE-FROM-OPS> 2,614,601
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,060,271
<NUMBER-OF-SHARES-REDEEMED> (32,822)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 40,775,324
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 38,533
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 170,857
<AVERAGE-NET-ASSETS> 18,182,993
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 1.66
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.66
<EXPENSE-RATIO> 1.25
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 042
<NAME> STATE STREET RESEARCH LEGACY FUND CLASS B
<S> <C>
<PERIOD-TYPE> 4-MOS
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 38,185,915
<INVESTMENTS-AT-VALUE> 40,747,944
<RECEIVABLES> 1,299,502
<ASSETS-OTHER> 88,674
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 42,136,120
<PAYABLE-FOR-SECURITIES> 1,180,078
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 180,718
<TOTAL-LIABILITIES> 1,360,796
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 38,155,845
<SHARES-COMMON-STOCK> 1,692,083
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 57,450
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,562,029
<NET-ASSETS> 40,775,324
<DIVIDEND-INCOME> 36,889
<INTEREST-INCOME> 42,045
<OTHER-INCOME> 0
<EXPENSES-NET> 95,207
<NET-INVESTMENT-INCOME> (16,273)
<REALIZED-GAINS-CURRENT> 68,845
<APPREC-INCREASE-CURRENT> 2,562,029
<NET-CHANGE-FROM-OPS> 2,614,601
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,699,460
<NUMBER-OF-SHARES-REDEEMED> (7,377)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 40,775,324
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 38,533
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 170,857
<AVERAGE-NET-ASSETS> 18,182,993
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.03)
<PER-SHARE-GAIN-APPREC> 1.67
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.64
<EXPENSE-RATIO> 2.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 043
<NAME> STATE STREET RESEARCH LEGACY FUND CLASS S
<S> <C>
<PERIOD-TYPE> 4-MOS
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 38,185,915
<INVESTMENTS-AT-VALUE> 40,747,944
<RECEIVABLES> 1,299,502
<ASSETS-OTHER> 88,674
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 42,136,120
<PAYABLE-FOR-SECURITIES> 1,180,078
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 180,718
<TOTAL-LIABILITIES> 1,360,796
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 38,155,845
<SHARES-COMMON-STOCK> 353,464
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 57,450
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,562,029
<NET-ASSETS> 40,775,324
<DIVIDEND-INCOME> 36,889
<INTEREST-INCOME> 42,045
<OTHER-INCOME> 0
<EXPENSES-NET> 95,207
<NET-INVESTMENT-INCOME> (16,273)
<REALIZED-GAINS-CURRENT> 68,845
<APPREC-INCREASE-CURRENT> 2,562,029
<NET-CHANGE-FROM-OPS> 2,614,601
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 353,464
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 40,775,324
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 38,533
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 170,857
<AVERAGE-NET-ASSETS> 18,182,993
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 1.65
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.68
<EXPENSE-RATIO> 1.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 044
<NAME> STATE STREET RESEARCH LEGACY FUND CLASS C
<S> <C>
<PERIOD-TYPE> 4-MOS
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 38,185,915
<INVESTMENTS-AT-VALUE> 40,747,944
<RECEIVABLES> 1,299,502
<ASSETS-OTHER> 88,674
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 42,136,120
<PAYABLE-FOR-SECURITIES> 1,180,078
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 180,718
<TOTAL-LIABILITIES> 1,360,796
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 38,155,845
<SHARES-COMMON-STOCK> 427,799
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 57,450
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,562,029
<NET-ASSETS> 40,775,324
<DIVIDEND-INCOME> 36,889
<INTEREST-INCOME> 42,045
<OTHER-INCOME> 0
<EXPENSES-NET> 95,207
<NET-INVESTMENT-INCOME> (16,273)
<REALIZED-GAINS-CURRENT> 68,845
<APPREC-INCREASE-CURRENT> 2,562,029
<NET-CHANGE-FROM-OPS> 2,614,601
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 428,033
<NUMBER-OF-SHARES-REDEEMED> (234)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 40,775,324
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 38,533
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 170,857
<AVERAGE-NET-ASSETS> 18,182,993
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> (0.03)
<PER-SHARE-GAIN-APPREC> 1.66
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.63
<EXPENSE-RATIO> 2.00
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000918572
<NAME> STATE STREET RESEARCH SECURITIES TRUST
<SERIES>
<NUMBER> 013
<NAME> STATE STREET RESEARCH INTERMEDIATE BOND FUND CLASS S
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> APR-30-1998
<PERIOD-END> APR-30-1998
<INVESTMENTS-AT-COST> 18,492,768
<INVESTMENTS-AT-VALUE> 18,533,793
<RECEIVABLES> 241,748
<ASSETS-OTHER> 38,531
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 18,814,072
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1,659,946
<TOTAL-LIABILITIES> 1,659,946
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,928,976
<SHARES-COMMON-STOCK> 1,756,790
<SHARES-COMMON-PRIOR> 1,727,276
<ACCUMULATED-NII-CURRENT> 133,413
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 49,298
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 42,439
<NET-ASSETS> 17,154,126
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1,150,421
<OTHER-INCOME> 0
<EXPENSES-NET> 128,113
<NET-INVESTMENT-INCOME> 1,022,308
<REALIZED-GAINS-CURRENT> 148,570
<APPREC-INCREASE-CURRENT> 249,642
<NET-CHANGE-FROM-OPS> 1,420,520
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,019,623)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 134,376
<NUMBER-OF-SHARES-REDEEMED> (125,326)
<SHARES-REINVESTED> 20,464
<NET-CHANGE-IN-ASSETS> 685,154
<ACCUMULATED-NII-PRIOR> 105,503
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (74,047)
<GROSS-ADVISORY-FEES> 94,036
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 275,167
<AVERAGE-NET-ASSETS> 17,097,455
<PER-SHARE-NAV-BEGIN> 9.53
<PER-SHARE-NII> 0.58
<PER-SHARE-GAIN-APPREC> 0.23
<PER-SHARE-DIVIDEND> (0.58)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.76
<EXPENSE-RATIO> 0.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
