PAGE 1
000 A000000 05/31/2008
000 C000000 0001190935
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 PIMCO CORPORATE OPPORTUNITY FUND
001 B000000 811-21238
001 C000000 2127393371
002 A000000 1345 AVENUE OF THE AMERICAS
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10105
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
008 A000001 ALLIANZ GLOBAL INVESTORS FUND MANAGEMENT LLC
008 B000001 A
008 C000001 801-31227
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10105
008 A000002 PACIFIC INVESTMENT MANAGEMENT COMPANY LLC
008 B000002 S
008 C000002 801-48187
008 D010002 NEWPORT BEACH
008 D020002 CA
008 D030002 92660
010 A000001 ALLIANZ GLOBAL INVESTORS FUND MANAGEMENT LLC
010 B000001 801-31227
010 C010001 NEW YORK
010 C020001 NY
010 C030001 10105
011 A000001 MERRILL LYNCH, PIERCE, FENNER & SMITH
011 B000001 8-07221
011 C010001 NEW YORK
011 C020001 NY
011 C030001 10080
011 A000002 AG EDWARDS & SONS, INC.
011 B000002 8-03548
011 C010002 ST. LOUIS
011 C020002 MO
011 C030002 63103
011 A000003 PRUDENTIAL SECURITIES, INC.
PAGE 2
011 B000003 8-04060
011 C010003 NEW YORK
011 C020003 NY
011 C030003 10080
011 A000004 UBS WARBURG
011 B000004 8-07346
011 C010004 STAMFORD
011 C020004 CT
011 C030004 06901
011 A000005 RBC DAIN RAUSCHER, INC.
011 B000005 8-45411
011 C010005 MINNEAPOLIS
011 C020005 MN
011 C030005 55402
011 A000006 WACHOVIA SECURITIES, INC.
011 B000006 8-02612
011 C010006 CHARLOTTE
011 C020006 NC
011 C030006 28202
011 A000007 ADVEST, INC.
011 B000007 8-04159
011 C010007 HARTFORD
011 C020007 CT
011 C030007 06103
012 A000001 PNC GLOBAL INVESTMENT SERVICING
012 B000001 84-58023
012 C010001 PROVIDENCE
012 C020001 RI
012 C030001 02940
013 A000001 PRICEWATERHOUSECOOPERS LLP
013 B010001 NEW YORK
013 B020001 NY
013 B030001 10017
014 A000001 ALLIANZ GLOBAL INVESTORS DISTRIBUTORS LLC
014 B000001 8-41811
014 A000002 ALLIANZ LIFE FINANCIAL SERVICES LLC
014 B000002 8-13630
014 A000003 DRESDNER KLEINWORT SECURITIES LLC
014 B000003 8-49647
014 A000004 NICHOLAS-APPLEGATE SECURITIES LLC
014 B000004 8-45406
014 A000005 QUESTAR CAPITAL CORPORATION
014 B000005 8-50174
014 A000006 RCM DISTRIBUTORS LLC
014 B000006 8-65309
015 A000001 STATE STREET BANK & TRUST CO.
015 B000001 C
015 C010001 KANSAS CITY
015 C020001 MO
015 C030001 64105
015 E010001 X
PAGE 3
015 A000002 EUROCLEAR QUINCY
015 B000002 C
015 C010002 BRUSSELS
015 D010002 BELGIUM
015 E040002 X
018 000000 Y
019 A000000 Y
019 B000000 74
019 C000000 ALLIANZGLO
020 A000001 GREENWICH CAPITAL MARKETS, INC.
020 B000001 13-3172275
020 C000001 63
020 A000002 THE GOLDMAN SACHS GROUP, INC.
020 B000002 13-4019460
020 C000002 32
020 A000003 CITIGROUP, INC.
020 B000003 52-1568099
020 C000003 5
020 A000004 MERRILL LYNCH & CO., INC.
020 B000004 13-2740599
020 C000004 5
020 A000005 LEHMAN BROTHERS HOLDINGS, INC.
020 B000005 13-3216325
020 C000005 3
021 000000 108
022 A000001 CREDIT SUISSE GROUP
022 B000001 13-5659485
022 C000001 531165
022 D000001 108090
022 A000002 STATE STREET CORP.
022 B000002 04-2456637
022 C000002 550842
022 D000002 1681
022 A000003 THE GOLDMAN SACHS GROUP, INC.
022 B000003 13-4019460
022 C000003 512433
022 D000003 27025
022 A000004 LEHMAN BROTHERS HOLDINGS, INC.
022 B000004 13-3216325
022 C000004 481998
022 D000004 34748
022 A000005 DEUTSCHE BANK AG
022 B000005 13-2944980
022 C000005 417962
022 D000005 46855
022 A000006 JPMORGAN CHASE & CO.
022 B000006 13-2624428
022 C000006 170112
022 D000006 81668
022 A000007 BANK OF AMERICA CORP.
022 B000007 56-0906609
PAGE 4
022 C000007 167853
022 D000007 57251
022 A000008 CITIGROUP, INC.
022 B000008 52-1568099
022 C000008 96882
022 D000008 31049
022 A000009 BARCLAYS BANK PLC
022 C000009 64377
022 D000009 23893
022 A000010 UBS AG
022 B000010 13-3873456
022 C000010 62367
022 D000010 19102
023 C000000 3145845
023 D000000 519299
024 000000 Y
025 A000001 BANK OF AMERICA CORP.
025 B000001 56-0906609
025 C000001 D
025 D000001 54671
025 A000002 CITIGROUP, INC.
025 B000002 52-1568099
025 C000002 D
025 D000002 51011
025 A000003 THE GOLDMAN SACHS GROUP, INC.
025 B000003 13-4019460
025 C000003 D
025 D000003 48671
025 A000004 LEHMAN BROTHERS HOLDINGS, INC.
025 B000004 13-3216325
025 C000004 D
025 D000004 39284
025 A000005 JPMORGAN CHASE & CO.
025 B000005 13-2624428
025 C000005 D
025 D000005 31881
025 A000006 BARCLAYS BANK PLC
025 C000006 D
025 D000006 27092
025 A000007 UBS AG
025 B000007 13-3873456
025 C000007 D
025 D000007 22178
025 A000008 CREDIT SUISSE GROUP
025 B000008 13-5659485
025 C000008 D
025 D000008 12969
025 A000009 DEUTSCHE BANK AG
025 B000009 13-2944980
025 C000009 D
025 D000009 11900
PAGE 5
025 A000010 STATE STREET CORP.
025 B000010 04-2456637
025 C000010 D
025 D000010 8581
025 A000011 MERRILL LYNCH & CO., INC.
025 B000011 13-2740599
025 C000011 D
025 D000011 6785
026 A000000 N
026 B000000 N
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 N
028 A010000 0
028 A020000 0
028 A030000 0
028 A040000 0
028 B010000 0
028 B020000 0
028 B030000 0
028 B040000 0
028 C010000 0
028 C020000 0
028 C030000 0
028 C040000 0
028 D010000 0
028 D020000 0
028 D030000 0
028 D040000 0
028 E010000 0
028 E020000 0
028 E030000 0
028 E040000 0
028 F010000 0
028 F020000 0
028 F030000 0
028 F040000 0
028 G010000 0
028 G020000 0
028 G030000 0
028 G040000 0
028 H000000 0
030 A000000 0
030 B000000 0.00
030 C000000 0.00
031 A000000 0
PAGE 6
031 B000000 0
032 000000 0
033 000000 0
035 000000 0
036 B000000 0
038 000000 0
042 A000000 0
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 Y
048 000000 0.600
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 N
052 000000 N
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 N
054 D000000 N
PAGE 7
054 E000000 N
054 F000000 N
054 G000000 Y
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 N
055 A000000 Y
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 0
062 A000000 Y
062 B000000 1.7
062 C000000 0.0
062 D000000 1.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.2
062 L000000 1.9
062 M000000 0.0
062 N000000 3.6
062 O000000 2.9
062 P000000 85.8
062 Q000000 3.4
062 R000000 0.0
063 A000000 0
063 B000000 5.3
064 A000000 N
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 Y
070 B010000 N
070 B020000 N
PAGE 8
070 C010000 Y
070 C020000 Y
070 D010000 Y
070 D020000 N
070 E010000 Y
070 E020000 Y
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 Y
070 H010000 Y
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
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 N
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000 455004
071 B000000 425791
071 C000000 1419405
071 D000000 30
072 A000000 6
072 B000000 53603
072 C000000 0
072 D000000 0
072 E000000 874
072 F000000 4456
072 G000000 0
072 H000000 0
072 I000000 16
072 J000000 171
072 K000000 0
072 L000000 125
072 M000000 45
072 N000000 0
072 O000000 0
PAGE 9
072 P000000 303
072 Q000000 0
072 R000000 45
072 S000000 22
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 763
072 X000000 5946
072 Y000000 6
072 Z000000 48537
072AA000000 0
072BB000000 24594
072CC010000 0
072CC020000 13669
072DD010000 57601
072DD020000 0
072EE000000 0
073 A010000 0.8717
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 1687
074 B000000 14062
074 C000000 51699
074 D000000 1402115
074 E000000 1913
074 F000000 0
074 G000000 0
074 H000000 3507
074 I000000 0
074 J000000 0
074 K000000 0
074 L000000 26502
074 M000000 148812
074 N000000 1650297
074 O000000 13930
074 P000000 755
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 4
074 R040000 168967
074 S000000 565000
074 T000000 901641
074 U010000 66167
074 U020000 0
074 V010000 13.63
074 V020000 0.00
074 W000000 0.0000
074 X000000 132
PAGE 10
074 Y000000 31189
075 A000000 0
075 B000000 0
076 000000 0.00
077 A000000 Y
077 B000000 N
077 C000000 Y
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 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078 000000 N
080 C000000 0
081 B000000 0
082 B000000 0
083 B000000 0
084 B000000 0
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
087 A010000 COMMON
087 A020000 72201B101
087 A030000 PTY
087 B010000 PREFERRED
087 B020000 72201B200
087 B030000 SERIES M
087 C010000 PREFERRED
087 C020000 72201B309
087 C030000 SERIES T
088 A000000 N
PAGE 11
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE LARRY ALTADONNA
TITLE TREASURER