PPM Investment Grade Municipal Income Fund

000 B000000 04/30/2010
000 C000000 0000890516
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
001 B000000 811-7096
001 C000000 2128213000
002 A000000 1285 AVENUE OF THE AMERICAS
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10019
002 D020000 6028
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
008 A000001 UBS GLOBAL ASSET MANAGEMENT (AMERICAS) INC.
008 B000001 A
008 C000001 801-34190
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10019
008 D040001 6028
010 A000001 UBS GLOBAL ASSET MANAGEMENT (AMERICAS) INC.
010 B000001 801-34910
010 C010001 NEW YORK
010 C020001 NY
010 C030001 10019
010 C040001 6028
012 A000001 PNC GLOBAL INVESTMENT SERVICING
012 B000001 84-1761
012 C010001 WILMINGTON
012 C020001 DE
012 C030001 19809
013 A000001 ERNST & YOUNG LLP
013 B010001 NEW YORK
013 B020001 NY
013 B030001 10036
014 A0000** UBS SECURITIES PHILIPPINES INC.
014 A0000** UBS SECURITIES PTE. LTD.
014 A0000** UBS SECURITIES PTE. LTD. SEOUL BRANCH
014 A0000** UBS SERVICE CENTRE (INDIA) PRIVATE LIMITED
014 A0000** UBS SERVICE CENTRE (POLAND) SP. ZO.O.

014 A0000** UBS SERVICES (USA) LLC
014 A0000** UBS SOUTH AFRICA (PROPRIETARY) LIMITED
014 A0000** UBS SWISS FINANCIAL ADVISERS AG
014 A0000** UBS TRUSTEES (BAHAMAS) LTD
014 A0000** UBS TRUSTEES (CAYMAN) LTD
014 A0000** UBS TRUSTEES (JERSEY) LTD
014 A0000** UBS TRUSTEES (SINGAPORE) LTD
014 A0000** UBS UK HOLDING LIMITED
014 A0000** UBS UK PROPERTIES LIMITED
014 A0000** UBS WEALTH MANAGEMENT (UK) LTD
014 A0000** UBS WEALTH MANAGEMENT AUSTRALIA LTD
014 A0000** UBS TRUST COMPANY NATIONAL ASSOCIATION
014 A0000** VERMOGENS ADVIES HOLDING B.V.
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-049596
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 B0000** 8-000000
014 A000001 CAISSE CENTRALE DE REESCOMPTE
014 B000001 8-000000
014 A000002 CCR ACTIONS S.A.
014 B000002 8-000000
014 A000003 CCR GESTION S.A.
014 B000003 8-000000
014 A000004 FONDCENTER AG
014 B000004 8-000000
014 A000005 OOO UBS BANK
014 B000005 8-000000
014 A000006 PT UBS SECURITIES INDONESIA
014 B000006 8-000000
014 A000007 UBS (BAHAMAS) LTD.
014 B000007 8-000000
014 A000008 UBS (FRANCE) S.A.
014 B000008 8-000000
014 A000009 UBS (GRAND CAYMAN) LIMITED
014 B000009 8-000000
014 A000010 UBS (ITALIA) S.P.A.
014 B000010 8-000000

014 A000011 UBS (LUXEMBOURG) S.A.
014 B000011 8-000000
014 A000012 UBS (MONACO) S.A.
014 B000012 8-000000
014 A000013 UBS ALTERNATIVE AND QUANTITATIVE INV LTD.
014 B000013 8-000000
014 A000014 UBS ALTERNATIVE AND QUANTITATIVE INV LLC
014 B000014 8-000000
014 A000015 UBS AMERICAS INC.
014 B000015 8-000000
014 A000016 UBS ASESORES SA
014 B000016 8-000000
014 A000017 UBS BANK (CANADA)
014 B000017 8-000000
014 A000018 UBS BANK MEXICO, S.A. INST DE BANCA MULT
014 B000018 8-000000
014 A000019 UBS GRUPO FINANCIERO
014 B000019 8-000000
014 A000020 UBS BANK USA
014 B000020 8-000000
014 A000021 UBS BANK, S.A.
014 B000021 8-000000
014 A000022 UBS BELGIUM SA/NV
014 B000022 8-000000
014 A000023 UBS CAPITAL (JERSEY) LTD.
014 B000023 8-000000
014 A000024 UBS CAPITAL B.V.
014 B000024 8-000000
014 A000025 UBS CARD CENTER AG
014 B000025 8-000000
014 A000026 UBS CLEARING AND EXECUTION SERVICES LIMITED
014 B000026 8-000000
014 A000027 UBS CONVERTIBLE SECURITIES (JERSEY) LIMITED
014 B000027 8-000000
014 A000028 UBS DERIVATIVES HONG KONG LIMITED
014 B000028 8-000000
014 A000029 UBS DEUTSCHLAND AG
014 B000029 8-000000
014 A000030 UBS FACTORING AG
014 B000030 8-000000
014 A000031 UBS FIDUCIARIA S.P.A.
014 B000031 8-000000
014 A000032 UBS FINANCE (CAYMAN ISLAND) LTD.
014 B000032 8-000000
014 A000033 UBS FINANCE (CURACAO) N.V.
014 B000033 8-000000
014 A000034 UBS FINANCE (DELAWARE) LLC
014 B000034 8-000000
014 A000035 UBS FINANCIAL SERVICES INC.
014 B000035 8-016267
014 A000036 UBS FINANCIAL SERVICES INC. OF PUERTO RICO

014 B000036 8-028475
014 A000037 UBS FUND ADVISOR, L.L.C.
014 B000037 8-000000
014 A000038 UBS FUND HOLDING (LUXEMBOURG) S.A.
014 B000038 8-000000
014 A000039 UBS FUND HOLDING (SWITZERLAND) AG
014 B000039 8-000000
014 A000040 UBS FUND MANAGEMENT (SWITZERLAND) AG
014 B000040 8-000000
014 A000041 UBS FUND SERVICES (CAYMAN) LTD
014 B000041 8-000000
014 A000042 UBS FUND SERVICES (IRELAND) LIMITED
014 B000042 8-000000
014 A000043 UBS FUND SERVICES (LUXEMBOURG) S.A.
014 B000043 8-000000
014 A000044 UBS FUND SERVICES (LUX) S.A. POLAND BRANCH
014 B000044 8-000000
014 A000045 UBS FUTURES SINGAPORE LTD.
014 B000045 8-000000
014 A000046 UBS GLOBAL ASSET MANAGEMENT (AMERICAS) INC.
014 B000046 8-000000
014 A000047 UBS GLOBAL ASSET MANAGEMENT (AUSTRALIA) LTD.
014 B000047 8-000000
014 A000048 UBS GLOBAL ASSET MANAGEMENT (CANADA) CO
014 B000048 8-000000
014 A000049 UBS GLOBAL ASSET MGMT (DEUTSCHLAND) GMBH
014 B000049 8-000000
014 A000050 UBS GLOBAL ASSET MANAGEMENT (FRANCE) S.A.
014 B000050 8-000000
014 A000051 UBS GLOBAL ASSET MGMT (HONG KONG) LIMITED
014 B000051 8-000000
014 A000052 UBS GLOBAL ASSET MANAGEMENT (ITALIA) SGR SPA
014 B000052 8-000000
014 A000053 UBS GLOBAL ASSET MANAGEMENT (JAPAN) LTD
014 B000053 8-000000
014 A000054 UBS GLOBAL ASSET MANAGEMENT (SINGAPORE) LTD.
014 B000054 8-000000
014 A000055 UBS GLOBAL ASSET MANAGEMENT (TAIWAN) LTD
014 B000055 8-000000
014 A000056 UBS GLOBAL ASSET MANAGEMENT (UK) LTD.
014 B000056 8-000000
014 A000057 UBS GLOBAL ASSET MANAGEMENT (US) INC.
014 B000057 8-021901
014 A000058 UBS GLOBAL ASSET MANAGEMENT FUNDS LTD
014 B000058 8-000000
014 A000059 UBS GLOBAL ASSET MANAGEMENT HOLDING LTD
014 B000059 8-000000
014 A000060 UBS GLOBAL ASSET MANAGEMENT LIFE LTD
014 B000060 8-000000
014 A000061 UBS GLOBAL LIFE AG
014 B000061 8-000000

014 A000062 UBS GLOBAL TRUST CORPORATION
014 B000062 8-000000
014 A000063 UBS GRUPO FINANCIERO, S.A. DE C.V.
014 B000063 8-000000
014 A000064 UBS HANA ASSET MANAGEMENT COMPANY LTD
014 B000064 8-000000
014 A000065 UBS INTERNATIONAL HOLDINGS B.V.
014 B000065 8-000000
014 A000066 UBS INTERNATIONAL INC.
014 B000066 8-053059
014 A000067 UBS INTERNATIONAL LIFE LIMITED
014 B000067 8-000000
014 A000068 UBS INVESTMENT MANAGEMENT CANADA INC.
014 B000068 8-000000
014 A000069 UBS INVESTMENTS PHILIPPINES, INC.
014 B000069 8-000000
014 A000070 UBS ITALIA SIM SPA
014 B000070 8-000000
014 A000071 UBS LEASING AG
014 B000071 8-000000
014 A000072 UBS LIFE AG
014 B000072 8-000000
014 A000073 UBS LIFE INSURANCE COMPANY USA
014 B000073 8-000000
014 A000074 UBS LIMITED
014 B000074 8-000000
014 A000075 UBS LOAN FINANCE LLC
014 B000075 8-000000
014 A000076 UBS MENKUL DEGERLER AS
014 B000076 8-000000
014 A000077 UBS NEW ZEALAND LIMITED
014 B000077 8-000000
014 A000078 UBS O'CONNOR LIMITED
014 B000078 8-000000
014 A000079 UBS O'CONNOR LLC
014 B000079 8-000000
014 A000080 UBS PREFERRED FUNDING COMPANY LLC I
014 B000080 8-000000
014 A000081 UBS PREFERRED FUNDING COMPANY LLC II
014 B000081 8-000000
014 A000082 UBS PREFERRED FUNDING COMPANY LLC IV
014 B000082 8-000000
014 A000083 UBS PREFERRED FUNDING COMPANY LLC V
014 B000083 8-000000
014 A000084 UBS REAL ESTATE KAPITALANLAGEGESELLSCHAFT MBH
014 B000084 8-000000
014 A000085 UBS REAL ESTATE SECURITIES INC
014 B000085 8-000000
014 A000086 UBS REALTY INVESTORS LLC
014 B000086 8-000000
014 A000087 UBS SAUERBORN PRIVATE EQUITY KOMP GMBH

014 B000087 8-000000
014 A000088 UBS SECURITIES (THAILAND) LTD
014 B000088 8-000000
014 A000089 UBS SECURITIES ASIA LIMITED
014 B000089 8-000000
014 A000090 UBS SECURITIES AUSTRALIA LTD
014 B000090 8-000000
014 A000091 UBS SECURITIES CANADA INC
014 B000091 8-000000
014 A000092 UBS SECURITIES ESPANA SOCIEDAD DE VALORES SA
014 B000092 8-000000
014 A000093 UBS SECURITIES FRANCE S.A.
014 B000093 8-000000
014 A000094 UBS SECURITIES HONG KONG LIMITED
014 B000094 8-000000
014 A000095 UBS SECURITIES INDIA PRIVATE LIMITED
014 B000095 8-000000
014 A000096 UBS SECURITIES INTERNATIONAL LIMITED
014 B000096 8-000000
014 A000097 UBS SECURITIES JAPAN LTD
014 B000097 8-000000
014 A000098 UBS SECURITIES LLC
014 B000098 8-022651
014 A000099 UBS SECURITIES MALAYSIA SDN. BHD.
014 B000099 8-000000
015 A000001 STATE STREET BANK & TRUST CO.
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02110
015 E010001 X
018 000000 Y
019 A000000 Y
019 B000000 102
019 C000000 UBSGLOBLAM
021 000000 0
022 A000001 JP MORGAN CHASE & CO.
022 B000001 13-3224016
022 C000001 69735
022 D000001 53228
022 A000002 DEUTSCHE BANK SECURITIES
022 B000002 13-3124068
022 C000002 55561
022 D000002 38314
022 A000003 CITIGROUP GLOBAL MARKETS
022 B000003 13-8008177
022 C000003 51779
022 D000003 41756
022 A000004 BARCLAYS BANK PLC
022 B000004 13-3551367
022 C000004 44458

022 D000004 24388
022 A000005 MORGAN STANLEY & CO.
022 B000005 13-2655998
022 C000005 25148
022 D000005 32493
022 A000006 BANK OF AMERICA SECURITIES
022 B000006 95-4035346
022 C000006 27493
022 D000006 24268
022 A000007 WELLS FARGO & CO.
022 B000007 94-1347393
022 C000007 24900
022 D000007 26016
022 A000008 GOLDMAN SACHS & CO.
022 B000008 13-5108880
022 C000008 2300
022 D000008 21949
022 A000009 GUGGENHEIM CAPITAL MARKETS LLC
022 B000009 00-0000000
022 C000009 5964
022 D000009 11513
022 A000010 MESIROW & CO.
022 B000010 00-0000000
022 C000010 5195
022 D000010 10572
023 C000000 315147
023 D000000 390832
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
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
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 0.900
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 Y
053 B000000 Y
053 C000000 N
054 A000000 Y
054 B000000 Y
054 C000000 N
054 D000000 N
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 Y
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 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 33.5
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0

062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 30.8
062 N000000 0.0
062 O000000 35.3
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 0
063 B000000 5.5
064 A000000 Y
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 Y
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 Y
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 Y
070 P020000 N
070 Q010000 Y

070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000 203957
071 B000000 331123
071 C000000 208702
071 D000000 98
072 A000000 7
072 B000000 5920
072 C000000 0
072 D000000 0
072 E000000 0
072 F000000 1187
072 G000000 0
072 H000000 0
072 I000000 8
072 J000000 31
072 K000000 92
072 L000000 34
072 M000000 26
072 N000000 0
072 O000000 0
072 P000000 20
072 Q000000 0
072 R000000 53
072 S000000 351
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 79
072 X000000 1881
072 Y000000 684
072 Z000000 4723
072AA000000 5780
072BB000000 4582
072CC010000 0
072CC020000 5461
072DD010000 4816
072DD020000 0
072EE000000 0
073 A010000 0.4650
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 39
074 B000000 0
074 C000000 50710
074 D000000 100040
074 E000000 0
074 F000000 0
074 G000000 0

074 H000000 0
074 I000000 0
074 J000000 0
074 K000000 0
074 L000000 936
074 M000000 3
074 N000000 151728
074 O000000 0
074 P000000 50
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 273
074 S000000 0
074 T000000 151405
074 U010000 10357
074 U020000 0
074 V010000 14.62
074 V020000 0.00
074 W000000 0.0000
074 X000000 179
074 Y000000 145436
075 A000000 0
075 B000000 151205
076 000000 14.56
077 A000000 Y
077 B000000 Y
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 Y
077 Q020000 N
077 Q030000 N
078 000000 N
080 A000000 ICI MUTUAL INSURANCE CO.
080 C000000 70000
081 A000000 Y
081 B000000 101
082 A000000 N

082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 1600
086 D020000 80000
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
087 A010000 COMMON STOCK
087 A020000 461368102
087 A030000 PPM
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE THOMAS DISBROW
TITLE TREASURER