PAGE  1
000 A000000 06/30/2008
000 C000000 0000275694
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000 F000000 Y
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000 I000000 6.1
000 J000000 U
001 A000000 MASSMUTUAL CORPORATE INVESTORS
001 B000000 811-2183
001 C000000 4132261516
002 A000000 1500 MAIN STREET, P.O. BOX 15189
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
008 A000001 BABSON CAPITAL MANAGEMENT LLC
008 B000001 A
008 C000001 801-241
008 D010001 SPRINGFIELD
008 D020001 MA
008 D030001 01115
008 D040001 5189
058 A000000 N
059  000000 Y
060 A000000 Y
060 B000000 Y
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062 A000000 Y
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062 F000000   0.0
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062 I000000   6.9
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062 P000000  87.1
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      PAGE  2
062 R000000  15.6
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077 Q010000 Y
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077 Q030000 Y
078  000000 N
SIGNATURE   JAMES M. ROY
TITLE       V.P. AND C.F.O.