<PAGE> PAGE 1
000 A000000 06/30/97
000 C000000 067813
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 MONTGOMERY STREET INCOME SECURITIES, INC.
001 B000000 811-2341
001 C000000 4159818191
002 A000000 101 CALIFORNIA STREET, SUITE 4100
002 B000000 SAN FRANCISCO
002 C000000 CA
002 D010000 94111
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
010 A000001 SCUDDER, STEVENS & CLARK
010 C010001 BOSTON
010 C020001 MA
010 C030001 02110
014 A000001 SCUDDER INVESTOR SERVICES, INC.
014 B000001 8-298
015 A000001 MERITA BANK, LTD.
015 B000001 S
015 C010001 HELSINKI
015 D010001 FINLAND
015 E040001 X
015 A000005 CHASE MANHATTAN BANK, N.A.
015 B000005 C
015 C010005 NEW YORK
015 C020005 NY
015 C030005 11245
015 E010005 X
015 A000006 CHASE MANHATTAN BANK AUSTRALIA LIMITED
015 B000006 S
<PAGE> PAGE 2
015 C010006 SYDNEY
015 D010006 AUSTRALIA
015 E040006 X
015 A000007 CREDITANSTALT-BANKVEREIN
015 B000007 S
015 C010007 VIENNA
015 D010007 AUSTRIA
015 E040007 X
015 A000008 GENERALE BANK
015 B000008 S
015 C010008 BRUSSELS
015 D010008 BELGIUM
015 E040008 X
015 A000009 ROYAL BANK OF CANADA
015 B000009 S
015 C010009 TORONTO
015 D010009 CANADA
015 E040009 X
015 A000010 DELETE
015 A000011 DEN DANSKE BANK
015 B000011 S
015 C010011 COPENHAGEN
015 D010011 DENMARK
015 E040011 X
015 A000012 DELETE
015 A000013 BANQUE PARIBAS
015 B000013 S
015 C010013 PARIS
015 D010013 FRANCE
015 E040013 X
015 A000014 CHASE BANK A.G.
015 B000014 S
015 C010014 FRANKFURT
015 D010014 GERMANY
015 E040014 X
015 A000015 BANQUE PARIBAS
015 B000015 S
015 C010015 HONG KONG
015 D010015 HONG KONG
015 E040015 X
015 A000016 BANQUE PARIBAS
015 B000016 S
015 C010016 MILAN
015 D010016 ITALY
015 E040016 X
015 A000017 THE FUJI BANK LIMITED
015 B000017 S
015 C010017 TOKYO
015 D010017 JAPAN
015 E040017 X
015 A000018 CHASE MANHATTAN BANK
<PAGE> PAGE 3
015 B000018 S
015 C010018 BERHAD
015 D010018 MALAYSIA
015 E040018 X
015 A000019 ABN-AMRO HOLDING N.V.
015 B000019 S
015 C010019 AMSTERDAM
015 D010019 NETHERLANDS
015 E040019 X
015 A000020 NATIONAL NOMINEES LTD.
015 B000020 S
015 C010020 AUKLAND
015 D010020 NEW ZEALAND
015 E040020 X
015 A000021 DEN NORSKE BANK
015 B000021 S
015 C010021 OSLO
015 D010021 NORWAY
015 E040021 X
015 A000022 CHASE MANHATTAN BANK
015 B000022 S
015 C010022 SINGAPORE
015 D010022 SINGAPORE
015 E040022 X
015 A000023 CHASE MANHATTAN BANK
015 B000023 S
015 C010023 MADRID
015 D010023 SPAIN
015 E040023 X
015 A000024 SKANDINAVISKA ENSKILDA BANKEN
015 B000024 S
015 C010024 STOCKHOLM
015 D010024 SWEDEN
015 E040024 X
015 A000025 UNION BANK OF SWITZERLAND
015 B000025 S
015 C010025 ZURICH
015 D010025 SWITZERLAND
015 E040025 X
015 A000026 CHASE MANHATTAN BANK
015 B000026 S
015 C010026 BANGKOK
015 D010026 THAILAND
015 E040026 X
015 A000027 DELETE
015 A000028 CHASE MANHATTAN BANK
015 B000028 S
015 C010028 LONDON
015 D010028 UNITED KINGDOM
015 E040028 X
015 A000029 THE CHASE MANHATTAN BANK MEXICO, S.A.
<PAGE> PAGE 4
015 B000029 S
015 C010029 MEXICO CITY
015 D010029 MEXICO
015 E040029 X
015 A000030 BANQUE BRUXELLES LAMBERT
015 B000030 S
015 C010030 MADRID
015 D010030 SPAIN
015 E040030 X
015 A000031 DELETE
022 A000001 SALOMON BROTHERS
022 B000001 13-3082694
022 C000001 95514
022 D000001 95316
022 A000002 AMERICAN EXPRESS CREDIT
022 B000002 13-2518466
022 C000002 77188
022 D000002 0
022 A000003 CHASE MANHATTAN BANK
022 C000003 66184
022 D000003 58
022 A000004 FORD MOTOR CREDIT
022 B000004 38-1612444
022 C000004 61721
022 D000004 100
022 A000005 GENERAL ELECTRIC CREDIT CORP
022 C000005 52933
022 D000005 6600
022 A000006 MERRILL LYNCH
022 B000006 13-5674085
022 C000006 28324
022 D000006 18714
022 A000007 CHEVRION OIL FINANCE CO.
022 C000007 41672
022 D000007 3300
022 A000008 FREDDIE MAC
022 C000008 20059
022 D000008 19719
022 A000009 SMITH BARNEY SHEARSON
022 B000009 13-1912900
022 C000009 15650
022 D000009 14771
022 A000010 CHASE SECURITIES
022 C000010 23752
022 D000010 0
023 C000000 586476
023 D000000 199850
024 000000 N
028 A010000 0
028 A020000 0
028 A030000 0
<PAGE> PAGE 5
028 A040000 0
028 B010000 0
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062 J000000 0.0
062 K000000 0.0
062 L000000 12.0
062 M000000 11.0
062 N000000 22.0
062 O000000 0.0
062 P000000 62.0
062 Q000000 0.9
062 R000000 2.0
063 A000000 0
063 B000000 15.0
064 A000000 N
064 B000000 N
070 A010000 N
070 A020000 N
070 B010000 N
<PAGE> PAGE 6
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 Y
070 E020000 N
070 F010000 N
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 N
070 K020000 N
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 Y
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 191361
071 B000000 190445
071 C000000 179457
071 D000000 113
072 A000000 6
072 B000000 7802
072 C000000 171
072 D000000 0
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072 J000000 7
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072 M000000 40
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<PAGE> PAGE 7
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 39
072 S000000 11
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 29
072 X000000 696
072 Y000000 0
072 Z000000 7277
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072BB000000 0
072CC010000 75
072CC020000 0
072DD010000 3556
072DD020000 0
072EE000000 0
073 A010000 0.3500
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 0
074 B000000 0
074 C000000 24943
074 D000000 192782
074 E000000 4145
074 F000000 0
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074 H000000 0
074 I000000 150
074 J000000 23688
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074 L000000 3128
074 M000000 4
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074 P000000 83
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074 R040000 182
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074 T000000 203503
074 U010000 10175
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074 V010000 20.00
074 V020000 0.00
074 W000000 0.0000
<PAGE> PAGE 8
074 X000000 0
074 Y000000 0
075 A000000 0
075 B000000 199843
076 000000 17.94
077 A000000 N
078 000000 N
086 A010000 16
086 A020000 283
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
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086 F010000 0
086 F020000 0
SIGNATURE THOMAS F. MCDONOUGH
TITLE VICE PRESIDENT
<TABLE> <S> <C>
<ARTICLE>6
<LEGEND>
This schedule contains summary financial information extracted from the
Montgomery Street Fund Semiannual Report for the fiscal period ended 6/30/97 and
is qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>0
<NAME>MONTGOMERY STREET FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1997
<PERIOD-START> JAN-01-1997
<PERIOD-END> JUN-30-1997
<INVESTMENTS-AT-COST> 218,780,185
<INVESTMENTS-AT-VALUE> 222,020,127
<RECEIVABLES> 26,815,161
<ASSETS-OTHER> 4,275
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 248,839,563
<PAYABLE-FOR-SECURITIES> 45,071,508
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 265,278
<TOTAL-LIABILITIES> 45,336,786
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 198,891,430
<SHARES-COMMON-STOCK> 10,174,992
<SHARES-COMMON-PRIOR> 10,158,937
<ACCUMULATED-NII-CURRENT> 3,785,328
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (2,413,940)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,239,959
<NET-ASSETS> 203,502,777
<DIVIDEND-INCOME> 171,268
<INTEREST-INCOME> 7,802,046
<OTHER-INCOME> 0
<EXPENSES-NET> 696,399
<NET-INVESTMENT-INCOME> 7,276,915
<REALIZED-GAINS-CURRENT> 957,761
<APPREC-INCREASE-CURRENT> 74,909
<NET-CHANGE-FROM-OPS> 8,309,585
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 3,555,593
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 16,055
<NET-CHANGE-IN-ASSETS> 5,036,955
<ACCUMULATED-NII-PRIOR> 13,940,795
<ACCUMULATED-GAINS-PRIOR> 2,330,201
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 487,524
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 696,399
<AVERAGE-NET-ASSETS> 199,842,580
<PER-SHARE-NAV-BEGIN> 19.54
<PER-SHARE-NII> (0.71)
<PER-SHARE-GAIN-APPREC> (0.10)
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.35
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 20.00
<EXPENSE-RATIO> 0.70
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
