PAGE 1 000 A000000 09/30/2016 000 C000000 0001166258 000 D000000 N 000 E000000 NF 000 F000000 Y 000 G000000 N 000 H000000 N 000 I000000 6.1 000 J000000 A 001 A000000 PIONEER HIGH INCOME TRUST 001 B000000 811-21043 001 C000000 6177427825 002 A000000 60 STATE ST 002 B000000 BOSTON 002 C000000 MA 002 D010000 02109 002 D020000 1820 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 PIONEER INVESTMENT MANAGEMENT, INC. 008 B000001 A 008 C000001 801-8255 008 D010001 BOSTON 008 D020001 MA 008 D030001 02109 008 D040001 1820 010 A000001 PIONEER INVESTMENT MANAGEMENT, INC. 010 B000001 801-8255 010 C010001 BOSTON 010 C020001 MA 010 C030001 02109 010 A000002 BROWN BROTHERS HARRIMAN & CO. 010 C010002 BOSTON 010 C020002 MA 010 C030002 02110 011 A000001 MERRILL LYNCH & CO. 011 B000001 8-7221 PAGE 2 011 C010001 NEW YORK 011 C020001 NY 011 C030001 10281 011 C040001 1201 011 A000002 UBS INVESTMENT BANK 011 B000002 8-022651 011 C010002 STAMFORD 011 C020002 CT 011 C030002 06901 011 A000003 RBC CAPITAL MARKETS CORP. 011 B000003 8-045411 011 C010003 MINNEAPOLIS 011 C020003 MN 011 C030003 55402 011 C040003 4422 011 A000004 ADVEST, INC. 011 B000004 8-21409 011 C010004 HARTFORD 011 C020004 CT 011 C030004 06103 011 A000005 JANNEY MONTGOMERY SCOTT, LLC 011 B000005 8-462 011 C010005 PHILADELPHIA 011 C020005 PA 011 C030005 19103 011 C040005 1675 011 A000006 MCDONALD INVESTMENTS, INC. 011 B000006 8-30177 011 C010006 CLEVELAND 011 C020006 OH 011 C030006 44114 011 C040006 2603 011 A000007 STIFEL, NICOLAUS & CO., INC. 011 B000007 8-001447 011 C010007 ST. LOUIS 011 C020007 MO 011 C030007 63102 012 A000001 PIONEER INVEST. MGMT. SHAREHOLDER SVCS., INC. 012 B000001 85-1359 012 C010001 BOSTON 012 C020001 MA 012 C030001 02109 012 A000002 AMERICAN STOCK TRANSFER & TRUST CO. (COMMON) 012 B000002 85-0000 012 C010002 BROOKLYN 012 C020002 NY 012 C030002 11219 012 C040002 5441 012 A000003 DEUTSCHE BANK TRUST COMPANY AMERICAS (PREF.) 012 B000003 85-05212 012 C010003 NEW YORK PAGE 3 012 C020003 NY 012 C030003 10005 013 A000001 DELOITTE & TOUCHE LLP 013 B010001 BOSTON 013 B020001 MA 013 B030001 02116 015 A000001 BROWN BROTHERS HARRIMAN & CO. 015 B000001 C 015 C010001 BOSTON 015 C020001 MA 015 C030001 02110 015 E010001 X 015 A000002 CITIBANK, N.A. BUENOS AIRES BRANCH 015 B000002 S 015 C010002 BUENOS AIRES 015 D010002 ARGENTINA 015 E040002 X 015 A000003 HSBC BANK AUSTRALIA LIMITED 015 B000003 S 015 C010003 SYDNEY 015 D010003 AUSTRALIA 015 E040003 X 015 A000004 UNICREDIT BANK AUSTRIA AG 015 B000004 S 015 C010004 VIENNA 015 D010004 AUSTRIA 015 E040004 X 015 A000005 STANDARD CHARTERED BANK, BANGLADESH BRANCH 015 B000005 S 015 C010005 DHAKA 015 D010005 BANGLADESH 015 E040005 X 015 A000006 BNP PARIBAS SECURITIES SERVICES 015 B000006 S 015 C010006 PANTIN 015 D010006 BELGIUM 015 E040006 X 015 A000007 EUROCLEAR BANK SA NV 015 B000007 S 015 C010007 BRUSSELS 015 D010007 BELGIUM 015 E040007 X 015 A000008 CITIBANK, N.A., SAO PAULO 015 B000008 S 015 C010008 SAO PAULO 015 D010008 BRAZIL 015 E040008 X 015 A000009 CITIBANK EUROPE PLC, BULGARIA BRANCH 015 B000009 S 015 C010009 SOFIA 015 D010009 BULGARIA PAGE 4 015 E040009 X 015 A000010 RBC INVESTOR SERVICES TRUST 015 B000010 S 015 C010010 TORONTO 015 D010010 CANADA 015 E040010 X 015 A000011 STANDARD CHARTERED BANK (CHINA) LIMITED 015 B000011 S 015 C010011 SHANGHAI 015 D010011 CHINA 015 E040011 X 015 A000012 CITITRUST COLUMBIA S.A., SOCIEDAD FIDUCIARA 015 B000012 S 015 C010012 BOGOTA 015 D010012 COLOMBIA 015 E040012 X 015 A000013 BANCO DE CHILE 015 B000013 S 015 C010013 SANTIAGO 015 D010013 CHILE 015 E040013 X 015 A000014 CITIBANK EUROPE PLC, ORGANIZACNI SLOZKA 015 B000014 S 015 C010014 PRAGUE 015 D010014 CZECH REPUBLIC 015 E040014 X 015 A000015 SKANDINAVISKA ENSKILDA BANKEN AB (PUBL) 015 B000015 S 015 C010015 COPENHAGEN 015 D010015 DENMARK 015 E040015 X 015 A000016 CITIBANK, N.A., CAIRO BRANCH 015 B000016 S 015 C010016 CAIRO 015 D010016 EGYPT 015 E040016 X 015 A000017 NORDEA BANK FINLAND PLC 015 B000017 S 015 C010017 HELSINKI 015 D010017 FINLAND 015 E040017 X 015 A000018 BNP PARIBAS SECURITIES SERVICES 015 B000018 S 015 C010018 PANTIN 015 D010018 FRANCE 015 E040018 X 015 A000019 BNP PARIBAS SECURITIES SERVICES, FRANKFURT BR 015 B000019 S 015 C010019 FRANKFURT 015 D010019 GERMANY 015 E040019 X PAGE 5 015 A000020 STANDARD CHARTERED BANK GHANA LTD. 015 B000020 S 015 C010020 ACCRA 015 D010020 GHANA 015 E040020 X 015 A000021 HSBC BANK PLC, ATHENS BRANCH 015 B000021 S 015 C010021 ATHENS 015 D010021 GREECE 015 E040021 X 015 A000022 STANDARD CHARTERED BANK (HONG KONG) LIMITED 015 B000022 S 015 C010022 KWUN TONG 015 D010022 HONG KONG 015 E040022 X 015 A000023 CITIBANK EUROPE PLC, HUNGARIAN BRANCH OFFICE 015 B000023 S 015 C010023 BUDAPEST 015 D010023 HUNGARY 015 E040023 X 015 A000024 CITIBANK, N.A., MUMBAI BRANCH 015 B000024 S 015 C010024 MUMBAI 015 D010024 INDIA 015 E040024 X 015 A000025 CITIBANK, N.A., JAKARTA BRANCH 015 B000025 S 015 C010025 JAKARTA 015 D010025 INDONESIA 015 E040025 X 015 A000026 CITIBANK, N.A., LONDON BRANCH 015 B000026 S 015 C010026 LONDON 015 D010026 IRELAND 015 E040026 X 015 A000027 BANK HAPOALIM BM 015 B000027 S 015 C010027 TEL AVIV 015 D010027 ISRAEL 015 E040027 X 015 A000028 BNP PARIBAS SECURITIES SERVICES, MILAN BRANCH 015 B000028 S 015 C010028 MILAN 015 D010028 ITALY 015 E040028 X 015 A000029 SUMITOMO MITSU BANKING CORPORATION 015 B000029 S 015 C010029 TOKYO 015 D010029 JAPAN 015 E040029 X 015 A000030 NORDEA BANK FINLAND PLC PAGE 6 015 B000030 S 015 C010030 HELSINKI 015 D010030 ESTONIA 015 E040030 X 015 A000031 UNICREDIT BANK AUSTRIA AG 015 B000031 S 015 C010031 VIENNA 015 D010031 AUSTRIA 015 E040031 X 015 A000032 HSBC BANK MIDDLE EAST LIMITED, KUWAIT BRANCH 015 B000032 S 015 C010032 SAFAT 015 D010032 KUWAIT 015 E040032 X 015 A000033 KBL EUROPEAN PRIVATE BANKERS SA 015 B000033 S 015 C010033 LUXEMBOURG 015 D010033 LUXEMBOURG 015 E040033 X 015 A000034 HSBC BANK MALAYSIA BERHAD 015 B000034 S 015 C010034 KUALA LUMPUR 015 D010034 MALAYSIA 015 E040034 X 015 A000035 BANCO NACIONAL DE MEXICO, S.A. (BANAMEX) 015 B000035 S 015 C010035 MEXICO CITY 015 D010035 MEXICO 015 E040035 X 015 A000036 CITIBANK MAGHREB 015 B000036 S 015 C010036 CASABLANCA 015 D010036 MOROCCO 015 E040036 X 015 A000037 BNP PARIBAS SECURITIES SERVICES 015 B000037 S 015 C010037 PANTIN 015 D010037 NETHERLANDS 015 E040037 X 015 A000038 HSBC BANK LIMITED, NEW ZEALAND BRANCH 015 B000038 S 015 C010038 AUCKLAND 015 D010038 NEW ZEALAND 015 E040038 X 015 A000039 STANBIC IBTC BANK, PLC 015 B000039 S 015 C010039 LAGOS 015 D010039 NIGERIA 015 E040039 X 015 A000040 NORDEA BANK NORGE ASA 015 B000040 S PAGE 7 015 C010040 OSLO 015 D010040 NORWAY 015 E040040 X 015 A000041 CITIBANK DEL PERU S.A. 015 B000041 S 015 C010041 LIMA 015 D010041 PERU 015 E040041 X 015 A000042 HSBC LIMITED, PHILIPPINE BRANCH 015 B000042 S 015 C010042 TAGUIG CITY 015 D010042 PHILIPPINES 015 E040042 X 015 A000043 BANK HANDLOWY W WARSZAWIE SA 015 B000043 S 015 C010043 WARSAW 015 D010043 POLAND 015 E040043 X 015 A000044 BNP PARIBAS SECURITIES SERVICES 015 B000044 S 015 C010044 PANTIN 015 D010044 PORTUGAL 015 E040044 X 015 A000045 HSBC BANK MIDDLE EAST LIMITED, QATAR BRANCH 015 B000045 S 015 C010045 ST. HELIER 015 D010045 QATAR 015 E040045 X 015 A000046 CITIBANK EUROPE PLC, DUBLIN-SUCURSALA ROMANIA 015 B000046 S 015 C010046 BUCHAREST 015 D010046 ROMANIA 015 E040046 X 015 A000047 AO CITIBANK FOR CITIBANK, N.A. 015 B000047 S 015 C010047 MOSCOW 015 D010047 RUSSIA 015 E040047 X 015 A000048 STANDARD CHARTERED BANK KENYA LIMITED 015 B000048 S 015 C010048 NAIROBI 015 D010048 KENYA 015 E040048 X 015 A000049 STANDARD CHARTERED BANK SINGAPORE BRANCH 015 B000049 S 015 C010049 SINGAPORE 015 D010049 SINGAPORE 015 E040049 X 015 A000050 CITIBANK EUROPE PLC, POBOCKA ZAHRANICNEJ BANK 015 B000050 S 015 C010050 BRATISLAVA PAGE 8 015 D010050 SLOVAKIA 015 E040050 X 015 A000051 STANDARD CHARTERED BANK, JOHANNESBURG BRANCH 015 B000051 S 015 C010051 JOHANNESBURG 015 D010051 SOUTH AFRICA 015 E040051 X 015 A000052 CITIBANK KOREA INC 015 B000052 S 015 C010052 SEOUL 015 D010052 SOUTH KOREA 015 E040052 X 015 A000053 BANCO BILBAO VIZCAYA AREGENTARIA SA 015 B000053 S 015 C010053 MADRID 015 D010053 SPAIN 015 E040053 X 015 A000054 HSBC, SRI LANKA BRANCH 015 B000054 S 015 C010054 COLOMBO 015 D010054 SRI LANKA 015 E040054 X 015 A000055 SKANDINAVISKA ENSKILDA BANKEN AB (PUBL) 015 B000055 S 015 C010055 STOCKHOLM 015 D010055 SWEDEN 015 E040055 X 015 A000056 CREDIT SUISSE AG 015 B000056 S 015 C010056 ZURICH 015 D010056 SWITZERLAND 015 E040056 X 015 A000057 BANK OF TAIWAN 015 B000057 S 015 C010057 TAIPEI 015 D010057 TAIWAN 015 E040057 X 015 A000058 HSBC LIMITED, THAILAND BRANCH 015 B000058 S 015 C010058 BANGKOK 015 D010058 THAILAND 015 E040058 X 015 A000059 CITIBANK ANONIM SIRKETI 015 B000059 S 015 C010059 ISTANBUL 015 D010059 TURKEY 015 E040059 X 015 A000060 HSBC BANK MIDDLE EAST LIMITED 015 B000060 S 015 C010060 DUBAI 015 D010060 UNITED ARAB EMIRATES PAGE 9 015 E040060 X 015 A000061 HSBC BANK PLC 015 B000061 S 015 C010061 LONDON 015 D010061 UNITED KINGDOM 015 E040061 X 015 A000062 CITIBANK, N.A., CARACAS BRANCH 015 B000062 S 015 C010062 CARACAS 015 D010062 VENEZUELA 015 E040062 X 015 A000063 HSBC BANK (VIETNAM) LTD 015 B000063 S 015 C010063 HO CHI MINH CITY 015 D010063 VIETNAM 015 E040063 X 015 A000064 DELETE 015 A000065 DELETE 018 000000 Y 019 A000000 Y 019 B000000 45 019 C000000 PIONEERFDS 020 A000001 CANTOR FITZGERALD & CO. 020 B000001 13-3680184 020 C000001 113 020 C000002 0 020 C000003 0 020 C000004 0 020 C000005 0 020 C000006 0 020 C000007 0 020 C000008 0 020 C000009 0 020 C000010 0 021 000000 113 022 A000001 CLEARVIEW TRADING ADVISORS, INC. 022 B000001 14-1981175 022 C000001 307665 022 D000001 0 022 A000002 BARCLAYS CAPITAL INC. 022 B000002 06-1031656 022 C000002 105087 022 D000002 2126 022 A000003 J.P. MORGAN SECURITIES LLC 022 B000003 13-3299429 022 C000003 88136 022 D000003 6724 022 A000004 GOLDMAN, SACHS & CO. 022 B000004 13-5108880 022 C000004 69732 022 D000004 3483 PAGE 10 022 A000005 MERRILL LYNCH, PIERCE, FENNER & SMITH INC. 022 B000005 13-5674085 022 C000005 59176 022 D000005 1049 022 A000006 CITIGROUP GLOBAL MARKETS INC. 022 B000006 11-2418191 022 C000006 51223 022 D000006 7264 022 A000007 NATIONAL FINANCIAL SERVICES LLC 022 B000007 04-3523567 022 C000007 48824 022 D000007 0 022 A000008 RBC CAPITAL MARKETS, LLC 022 B000008 41-1228350 022 C000008 28572 022 D000008 3162 022 A000009 DEUTSCHE BANK SECURITIES INC. 022 B000009 13-2730828 022 C000009 9482 022 D000009 4083 022 A000010 CREDIT SUISSE SECURITIES (USA) LLC 022 B000010 05-0546650 022 C000010 10184 022 D000010 2799 023 C000000 816898 023 D000000 58693 024 000000 Y 025 A000001 BANK OF AMERICA CORP. 025 B000001 56-0906609 025 C000001 D 025 D000001 2236 025 A000002 BANK OF AMERICA CORP. 025 B000002 56-0906609 025 C000002 E 025 D000002 2139 025 A000003 GOLDMAN SACHS & CO. 025 B000003 13-5108880 025 C000003 D 025 D000003 887 025 A000004 CREDIT SUISSE SECURITIES (USA)LLC 025 B000004 05-0546650 025 C000004 D 025 D000004 688 025 D000005 0 025 D000006 0 025 D000007 0 025 D000008 0 026 A000000 N 026 B000000 Y 026 C000000 N 026 D000000 Y PAGE 11 026 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 PAGE 12 042 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 Y 054 D000000 N 054 E000000 N 054 F000000 N 054 G000000 N 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 PAGE 13 055 B000000 N 056 000000 N 057 000000 N 058 A000000 N 059 000000 Y 060 A000000 Y 060 B000000 Y 061 000000 0 062 A000000 Y 062 B000000 4.1 062 C000000 0.0 062 D000000 0.8 062 E000000 0.0 062 F000000 0.0 062 G000000 0.0 062 H000000 0.0 062 I000000 0.6 062 J000000 0.0 062 K000000 0.0 062 L000000 0.0 062 M000000 6.5 062 N000000 0.0 062 O000000 0.5 062 P000000 109.0 062 Q000000 13.2 062 R000000 4.1 063 A000000 0 063 B000000 5.5 064 A000000 N 064 B000000 Y 065 000000 N 066 A000000 N 067 000000 N 068 A000000 N 068 B000000 N 069 000000 N 070 A010000 Y 070 A020000 Y 070 B010000 Y 070 B020000 N 070 C010000 Y 070 C020000 N 070 D010000 Y 070 D020000 N 070 E010000 Y 070 E020000 N 070 F010000 Y 070 F020000 N 070 G010000 Y 070 G020000 N 070 H010000 Y PAGE 14 070 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 N 070 M020000 Y 070 N010000 N 070 N020000 N 070 O010000 N 070 O020000 N 070 P010000 N 070 P020000 N 070 Q010000 N 070 Q020000 N 070 R010000 N 070 R020000 N 071 A000000 100832 071 B000000 105547 071 C000000 396493 071 D000000 25 072 A000000 6 072 B000000 16631 072 C000000 307 072 D000000 0 072 E000000 874 072 F000000 1248 072 G000000 53 072 H000000 0 072 I000000 7 072 J000000 17 072 K000000 0 072 L000000 5 072 M000000 7 072 N000000 0 072 O000000 0 072 P000000 1573 072 Q000000 0 072 R000000 25 072 S000000 30 072 T000000 0 072 U000000 0 072 V000000 0 072 W000000 63 072 X000000 3028 072 Y000000 0 072 Z000000 14784 PAGE 15 072AA000000 0 072BB000000 5021 072CC010000 35976 072CC020000 0 072DD010000 15166 072DD020000 0 072EE000000 0 073 A010000 0.5200 073 A020000 0.0000 073 B000000 0.0000 073 C000000 0.0000 074 A000000 6353 074 B000000 2280 074 C000000 14279 074 D000000 392329 074 E000000 11150 074 F000000 1432 074 G000000 0 074 H000000 0 074 I000000 0 074 J000000 564 074 K000000 0 074 L000000 7367 074 M000000 440 074 N000000 436194 074 O000000 6372 074 P000000 183 074 Q000000 125000 074 R010000 0 074 R020000 0 074 R030000 0 074 R040000 978 074 S000000 0 074 T000000 303661 074 U010000 29232 074 U020000 0 074 V010000 10.39 074 V020000 0.00 074 W000000 0.0000 074 X000000 8631 074 Y000000 645 075 A000000 0 075 B000000 289405 076 000000 10.51 077 A000000 N 078 000000 N 080 C000000 0 081 B000000 0 082 B000000 0 083 B000000 0 084 B000000 0 PAGE 16 086 A010000 118 086 A020000 1188 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 STOCK 087 A020000 72369H106 087 A030000 PHT 087 B010000 PREFERRED STOCK - SERIES M7 087 B020000 72369H205 087 C010000 PREFERRED STOCK - SERIES W28 087 C020000 72369H304 088 A000000 N 088 B000000 N 088 C000000 Y 088 D000000 N SIGNATURE MARK E. BRADLEY TITLE TREASURER