PAGE  1
000 B000000 12/31/2001
000 C000000 0000275694
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 MASSMUTUAL CORPORATE INVESTORS
001 B000000 811-2183
001 C000000 4132261000
002 A000000 1500 MAIN STREET, SUITE 1100
002 B000000 SPRINGFIELD
002 C000000 MA
002 D010000 01115
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 DAVID L. BABSON & COMPANY INC.
008 B000001 A
008 C000001 801-241
008 D010001 SPRINGFIELD
008 D020001 MA
008 D030001 01115
012 A000001 SHAREHOLDER FINANCIAL SERVICES, INC.
012 B000001 84-1817
012 C010001 DENVER
012 C020001 CO
012 C030001 80231
013 A000001 DELOITTE & TOUCHE
013 B010001 NEW YORK
013 B020001 NY
013 B030001 10281
013 B040001 1414
015 A000001 CITIBANK, N.A.
015 B000001 C
015 C010001 NEW YORK
      PAGE  2
015 C020001 NY
015 C030001 10043
015 E010001 X
015 A000002 THE CHASE MANHATTAN BANK, N.A.
015 B000002 C
015 C010002 NEW YORK
015 C020002 NY
015 C030002 10043
015 E010002 X
015 A000003 DELETE
015 A000004 DELETE
018  000000 Y
019 A000000 Y
019 B000000    2
019 C000000 CIPIINVEST
020 A000001 ALLEN & COMPANY INCORPORATED
020 B000001 13-6176976
020 C000001     30
020 A000002 LAZARD FRERES AND CO
020 B000002 13-5545100
020 C000002      7
020 A000003 FIRST BOSTON CORPORATION
020 B000003 13-5659485
020 C000003      4
020 A000004 DUNLEVY & CO
020 B000004 13-2919975
020 C000004      3
020 A000005 SALOMON SMITH BARNEY HOLD INC
020 B000005 11-2418191
020 C000005      1
020 A000006 MERRILL, LYNCH PIERCE, FENNER & SMITH INC.
020 B000006 13-5674085
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000       45
022 A000001 GOLDMAN, SACHS & CO
022 B000001 13-5108880
022 C000001    258654
022 D000001      3757
022 A000002 MERRILL, LYNCH PIERCE, FENNER & SMITH INC.
022 B000002 13-5674085
022 C000002    187874
022 D000002     10490
022 A000003 FIRST CHICAGO CAPITAL MARKET
022 B000003 36-3595942
022 C000003     48377
022 D000003      2146
022 A000004 J.P. MORGAN CHASE
      PAGE  3
022 B000004 13-4994650
022 C000004     35897
022 D000004      2659
022 A000005 SHEARSON LEHMAN AMERICAN EXPRESS
022 B000005 13-2518466
022 C000005     12598
022 D000005      1455
022 A000006 RAYMOND JAMES
022 B000006 59-1237041
022 C000006         0
022 D000006      7782
022 A000007 FIRST BOSTON CORPORATION
022 B000007 13-5659485
022 C000007      5573
022 D000007      2163
022 A000008 ROBERTSON, STEPHENS & CO.
022 B000008 94-2524501
022 C000008      1033
022 D000008      2914
022 A000009 JP MORGAN
022 B000009 13-2655998
022 C000009      3213
022 D000009         0
022 A000010 SALOMON SMITH BARNEY, INC.
022 B000010 11-2418191
022 C000010       625
022 D000010      2295
023 C000000     629035
023 D000000      56816
024  000000 N
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 N
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  4
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 N
051  000000 Y
052  000000 N
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 Y
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  5
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 N
060 B000000 N
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   6.0
062 J000000   0.0
062 K000000   0.0
062 L000000   0.0
062 M000000   0.0
062 N000000   0.0
062 O000000   0.0
062 P000000  79.7
062 Q000000   0.0
062 R000000  24.8
063 A000000   0
063 B000000  5.7
064 A000000 Y
064 B000000 Y
065  000000 N
066 A000000 Y
066 B000000 N
066 C000000 N
066 D000000 N
066 E000000 N
066 F000000 N
066 G000000 Y
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
      PAGE  6
070 C010000 N
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 N
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 N
070 M010000 N
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 N
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000     46570
071 B000000     59332
071 C000000    190226
071 D000000   24
072 A000000 12
072 B000000    19005
072 C000000      485
072 D000000        0
072 E000000        0
072 F000000     2705
072 G000000        0
072 H000000        0
072 I000000       36
072 J000000        4
072 K000000        0
072 L000000      105
072 M000000      132
072 N000000        0
072 O000000        0
      PAGE  7
072 P000000     1515
072 Q000000        0
072 R000000       29
072 S000000       52
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       55
072 X000000     4633
072 Y000000        0
072 Z000000    14857
072AA000000    17541
072BB000000    15200
072CC010000        0
072CC020000     6973
072DD010000    15595
072DD020000        0
072EE000000      746
073 A010000   1.7900
073 A020000   0.0000
073 B000000   0.0900
073 C000000   0.0000
074 A000000     2280
074 B000000        0
074 C000000    10543
074 D000000   139546
074 E000000    10785
074 F000000    18649
074 G000000        0
074 H000000        0
074 I000000    13938
074 J000000      233
074 K000000        0
074 L000000     4157
074 M000000       40
074 N000000   200171
074 O000000        0
074 P000000      658
074 Q000000    20000
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000     4400
074 S000000        0
074 T000000   175113
074 U010000  8725242
074 U020000        0
074 V010000    20.07
074 V020000     0.00
074 W000000   0.0000
074 X000000     2870
      PAGE  8
074 Y000000        0
075 A000000        0
075 B000000   181267
076  000000    20.70
077 A000000 Y
077 B000000 Y
077 Q020000 Y
078  000000 N
080 A000000 NEW HAMPSHIRE INSURANCE COMPANY
080 B000000 NONE
080 C000000     1200
081 A000000 Y
081 B000000   1
082 A000000 N
082 B000000        0
083 A000000 N
083 B000000        0
084 A000000 N
084 B000000        0
085 A000000 N
086 A010000    138
086 A020000   3097
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 COMMON SHARES
087 A020000 576292106
087 A030000 MCI
088 A000000 Y
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE   CHARLES C. MCCOBB, JR.
TITLE       V.P. AND C.F.O.