OMB APPROVAL OMB Number: 3235-0578 Expires: April 30, 2010 Estimated average burden hours per response..... 10.5 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-Q CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-21043 Pioneer High Income Trust (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Dorothy E. Bourassa, Pioneer Investment Management, Inc., 60 State Street, Boston, MA 02109 (Name and address of agent for service) Registrant's telephone number, including area code: (617) 742-7825 Date of fiscal year end: March 31 Date of reporting period: June 30, 2007 Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after close of the first and third fiscal quarters, pursuant to Rule 30b1-5under the Investment Company Act of 1940 (17 CFR 270.30b-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles. A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. ss. 3507. ITEM 1. Schedule of Investments. Pioneer High Income Trust SCHEDULE OF INVESTMENTS 6/30/07 (unaudited) Principal Amount USD ($) Value COLLATERIZED MORTGAGE OBLIGATIONS - 0.3% of Net Assets Diversified Financials - 0.3% 1,245,000 DB Master Finance LLC, 8.285%, 6/20/31 (144A) $ 1,257,421 TOTAL COLLATERIZED MORTGAGE OBLIGATIONS (Cost $1,268,107) $ 1,257,421 CORPORATE BONDS & NOTES - 115.9% of Net Assets Energy - 13.9% Oil & Gas Drilling - 2.8% 4,400,000 DDI Holding AS, 9.3%, 1/19/12 (144A) $ 4,631,000 2,500,000 Norse Energy Corp. ASA, 6.5%, 7/14/11 (144A) 2,018,750 3,000,000 Norse Energy Corp. ASA, 10.0%, 7/13/10 507,928 11,500,000 Petrojack AS, 11.0%, 4/19/10 1,985,998 3,500,000 Skeie Drilling & Production ASA, 11.25%, 3/8/13 3,535,000 $12,678,676 Oil & Gas Equipment & Services - 2.3% 600,000 (a) DP Producer AS, 11.36%, 12/5/11 (144A) $ 612,000 1,100,000 Nexus 1 Pte, Ltd., 10.5%, 3/7/12 (144A) 1,111,000 2,000,000 Sevan Marine ASA, 9.25%, 12/20/11 (144A) 2,080,000 4,540,000 White Pine Hydro Portfolio LLC, 7.26%, 7/20/15 4,540,000 $ 8,343,000 Integrated Oil & Gas - 0.4% 1,770,000 Tristan Oil, Ltd., 10.5%, 1/1/12 (144A) $ 1,840,800 Oil & Gas Exploration & Production - 5.6% 6,584,000 Baytex Energy, Ltd., 9.625%, 7/15/10 $ 6,814,440 3,200,000 Biofuel Energy ASA, 10.0%, 6/7/12 3,200,000 1,250,000 Hilcorp Energy I, LP, 9.0%, 6/1/16 (144A) 1,293,750 4,500,000 Methanex Corp., 8.75%, 8/15/12 4,950,000 500,000 (a) PetroProd, Ltd., 11.355%, 1/12/12 513,750 5,300,000 PetroQuest Energy, Inc., 10.375%, 5/15/12 5,498,750 3,135,000 Stone Energy Corp., 6.75%, 12/15/14 2,884,200 $25,154,890 Oil & Gas Refining & Marketing - 2.5% 4,325,000 Aventine Renewable Energy Holdings, Inc., 10.0%, 4/$ 4,238,500 2,425,000 VeraSun Energy Corp., 9.375%, 6/1/17 (144A) 2,255,250 4,280,000 VeraSun Energy Corp., 9.875%, 12/15/12 4,494,000 $10,987,750 Oil & Gas Storage & Transportation - 0.3% 2,130,000 SemGroup L.P., 8.75%, 11/15/15 (144A) $ 2,140,650 820,000 Targa Resources, Inc., 8.5%, 11/1/13 (144A) 832,300 $ 2,972,950 Total Energy $61,978,066 Materials - 17.1% Commodity Chemicals - 3.0% 4,635,000 ARCO Chemical Co., 9.8%, 2/1/20 $ 5,028,975 2,210,000 Georgia Gulf Corp., 9.5%, 10/15/14 2,198,950 2,650,000 (l) Georgia Gulf Corp., 10.75%, 10/15/16 2,636,750 3,150,000 Invista, 9.25%, 5/1/12 (144A) 3,331,125 $13,195,800 Diversified Chemicals - 2.1% 3,200,000 Basell Finance Co., 8.1%, 3/15/27 (144A) $ 2,912,000 3,000,000 Hexion US Finance Corp./Hexion Nova Scotia Finance U 3,105,000 2,000,000 Ineos Group Holdings Plc., 8.5%, 2/15/16 (144A) 1,955,000 1,190,000 Nell AF S.a.r.l., 8.375%, 8/15/15 (144A) 1,611,170 $ 9,583,170 Specialty Chemicals - 1.0% 785,000 MacDermid, Inc., 9.5%, 4/15/07 (144A) $ 788,925 3,300,000 Tronox Worldwide LLC, 9.5%, 12/1/12 3,440,250 $ 4,229,175 Construction Materials - 2.5% 4,500,000 AGY Holding Corp., 11.0%, 11/15/14 (144A) $ 4,730,625 825,000 Blaze Recycling & Metals LLC, 10.875%, 7/15/12 (144A 841,500 1,500,000 Panolam Industries International, Inc., 10.75%, 10/1 1,567,500 4,185,000 U.S. Concrete, Inc., 8.375%, 4/1/14 4,174,538 $11,314,163 Paper Packaging - 2.9% 5,450,000 Exopack Holding Corp., 11.25%, 2/1/14 $ 5,749,750 5,540,000 Graphic Packaging International, Inc., 9.5%, 8/15/13 5,754,675 46,000 MDP Acquisitions Plc, 10.125%, 10/1/12 65,853 1,500,000 U.S. Corrugated, Inc., 10.0%, 6/1/13 1,488,750 $13,059,028 Aluminum - 1.5% 2,035,000 Aleris International, Inc., 10.0%, 12/15/16 (144A) $ 2,019,737 1,200,000 Asia Aluminum Holdings, Ltd., 8.0%, 12/23/11 (144A) 1,182,000 3,180,000 Indalex Holding Corp., 11.5%, 2/1/14 3,307,200 $ 6,508,937 Diversified Metals & Mining - 3.0% 3,300,000 American Rock Salt Co. LLC, 9.5%, 3/15/14 $ 3,337,125 3,000,000 FMG Finance Pty., Ltd., 10.625%, 9/1/16 (144A) 3,570,000 1,505,000 (a)(Noranda Aluminium Acquisition Corp., 9.36%, 5/15/15 1,452,325 3,050,000 PNA Group, Inc., 10.75%, 9/1/16 (144A) 3,324,500 1,870,000 (a) PNA Intermediate Holding Corp., 12.36%, 2/15/13 (144 1,888,700 $13,572,650 Steel - 0.7% 2,900,000 CSN Islands VIII Corp., 9.75%, 12/16/13 (144A) $ 3,255,250 Forest Products - 0.4% 1,645,000 Mandra Forestry Holdings, Ltd., 12.0%, 5/15/13 (144$ 1,661,450 Total Materials $76,379,623 Capital Goods - 8.8% Building Products - 2.0% 6,135,000 (a) Builders FirstSource, Inc., 9.61%, 2/15/12 $ 6,211,687 2,500,000 Industrias Unidas SA de CV, 11.5%, 11/15/16 (144A) 2,631,250 $ 8,842,937 Electrical Components & Equipment - 0.7% 660,000 Baldor Electric Co., 8.625%, 2/15/17 $ 697,950 2,270,000 (c) Caiua Servicos Electricidad SA, 11.125% (144A) 2,374,420 $ 3,072,370 Heavy Electrical Equipment - 2.0% 4,790,000 Altra Industrial Motion, 9.0%, 12/1/11 $ 4,957,650 3,975,000 Hawk Corp., 8.75%, 11/1/14 4,094,250 $ 9,051,900 Construction & Farm Machinery & Heavy Truck - 3.8% 2,900,000 Accuride Corp., 8.5%, 2/1/15 $ 2,863,750 5,250,000 Commercial Vehicle Group, Inc., 8.0%, 7/1/13 5,236,875 1,520,000 Esco Corp., 8.625%, 12/15/13 (144A) 1,596,000 1,750,000 Greenbrier Companies, Inc., 8.375%, 5/15/15 1,763,125 1,000,000 (d) Stanadyne Corp., 0.0%, 2/15/15 830,000 4,690,000 Stanadyne Corp., 10.0%, 8/15/14 4,959,675 $17,249,425 Industrial Machinery - 0.3% 1,217,000 Manitowac Co., Inc., 10.5%, 8/1/12 $ 1,283,935 Total Capital Goods $39,500,567 Commercial Services & Supplies - 7.0% Diversified Commercial & Professional Services - 3.5% 3,500,000 Allied Security Escrow, 11.375%, 7/15/11 $ 3,517,500 1,050,000 Mobile Services Group, Inc., 9.75%, 8/1/14 (144A) 1,118,250 9,000,000 NCO Group, Inc., 11.875%, 11/15/14 (144A) 9,292,500 1,565,000 Park-Ohio Industries, Inc., 8.375%, 11/15/14 1,506,312 $15,434,562 Environmental & Facilities Services - 3.5% 4,088,000 Clean Harbors, Inc., 11.25%, 7/15/12 $ 4,514,333 5,020,000 Hydrochem Industrial Services, Inc., 9.25%, 2/15/13 5,170,600 5,800,000 Waste Services, Inc., 9.5%, 4/15/14 6,097,250 $15,782,183 Total Commercial Services & Supplies $31,216,745 Transportation - 5.0% Air Freight & Logistics - 0.5% 1,545,000 CEVA Group Plc, 10.0%, 12/1/16 (144A) $ 2,044,865 Airlines - 0.6% 976,135 American Airlines, Inc., 7.379%, 11/23/17 $ 912,686 817,814 Continental Airlines, Inc., Series B, 8.499%, 11/1/1 830,082 1,000,000 (c) GOL Finance, 8.75% (144A) 1,002,500 $ 2,745,268 Marine - 3.4% 3,899,000 (d) H-Lines Finance Holding, 0.0%, 4/1/13 $ 3,821,020 8,000,000 Seabulk International, Inc., 9.5%, 8/15/13 8,550,000 2,900,000 Trailer Bridge, Inc., 9.25%, 11/15/11 2,965,250 $15,336,270 Railroads - 0.5% 2,250,000 Kansas City Southern de Mexico, 9.375%, 5/1/12 $ 2,407,500 Total Transportation $22,533,903 Automobiles & Components - 1.2% Auto Parts & Equipment - 1.2% 5,965,000 (l) Cooper-Standard Automotive, Inc., 8.375%, 12/15/14 $ 5,562,362 Total Automobiles & Components $ 5,562,362 Consumer Durables & Apparel - 2.0% Homebuilding - 1.6% 2,000,000 Meritage Homes Corp., 6.25%, 3/15/15 $ 1,780,000 1,480,000 (l) TOUSA, Inc., 10.375%, 7/1/12 1,243,200 1,100,000 (l) WCI Communities, Inc., 7.875%, 10/1/13 1,012,000 600,000 (l) William Lyon Homes, Inc., 7.5%, 2/15/14 504,000 3,200,000 William Lyon Homes, Inc., 7.625%, 12/15/12 2,736,000 $ 7,275,200 Housewares & Specialties - 0.4% 1,650,000 (l) Yankee Acquisition Corp., 9.75%, 2/15/17 $ 1,596,375 Total Consumer Durables & Apparel $ 8,871,575 Consumer Services - 5.5% Casinos & Gaming - 5.0% 2,000,000 Buffalo Thunder Development Authority, 9.375%, 12/1$ 2,000,000 1,400,000 Fontainebleau Las Vegas Holdings LLC/Fontainebleau L 1,379,000 1,675,000 Galaxy Entertainment Finance Co., Ltd., 9.875%, 12/1 1,800,625 4,500,000 Little Traverse Bay Bands of Odawa Indians, 10.25%, 4,635,000 1,700,000 Pokagon Gaming Authority, 10.375%, 6/15/14 (144A) 1,874,250 1,750,000 Shingle Springs Tribal Gaming Authority, 9.375%, 6/1 1,765,312 2,450,000 Trump Entertainment Resorts, Inc., 8.5%, 6/1/15 2,431,625 6,800,000 Wimar Opco LLC, 9.625%, 12/15/14 (144A) 6,545,000 $22,430,812 Hotels, Resorts & Cruise Lines - 0.5% 2,000,000 (a) HRP Myrtle Beach Operations LLC, 10.07%, 4/1/12 (14$ 2,000,000 Total Consumer Services $24,430,812 Media - 4.7% Broadcasting & Cable Television - 2.4% 3,200,000 CCH I Holdings LLC, 11.0%, 10/1/15 $ 3,340,000 1,500,000 CCH II Holdings LLC, 10.25%, 9/15/10 1,565,625 3,750,000 Kabel Deutschland GMBH, 10.75%, 7/1/14 5,659,642 $10,565,267 Publishing - 2.3% 1,710,237 (b) AAC Group Holding Corp., 14.75%, 10/1/12 $ 1,876,985 4,835,000 Sheridan Acquisition Corp., 10.25%, 8/15/11 5,076,750 3,700,000 (d) Visant Holding Corp., 0.0%, 12/1/13 3,394,750 $10,348,485 Total Media $20,913,752 Retailing - 2.1% Distributors - 1.1% 4,735,000 Intcomex, Inc., 11.75%, 1/15/11 $ 4,877,050 820,000 KAR Holdings, Inc., 10.0%, 5/1/15 (144A) 799,500 $ 5,676,550 Catalog Retail - 1.0% 4,615,000 Sally Holdings LLC, 10.5%, 11/15/16 (144A) $ 4,638,075 Total Retailing $10,314,625 Food & Staples Retailing - 0.7% Drug Retail - 0.7% 3,350,000 Duane Reade, Inc., 9.75%, 8/1/11 $ 3,274,625 Total Food & Staples Retailing $ 3,274,625 Food, Beverage & Tobacco - 4.0% Brewers - 1.5% 5,885,000 Cia Brasileira de Bebida, 10.5%, 12/15/11 $ 6,914,875 Agricultural Products - 0.6% 2,000,000 (c) Cosan SA Industria e Comercio, 8.25% (144A) $ 2,025,000 500,000 Marfrig Overseas, Ltd., 9.625%, 11/16/16 (144A) 522,500 $ 2,547,500 Packaged Foods & Meats - 1.6% 775,000 Bertin, Ltd., 10.25%, 10/5/16 (144A) $ 848,625 2,410,000 Minerva Overseas, Ltd., 9.5%, 2/1/17 (144A) 2,482,300 3,180,000 Nutro Products, Inc., 10.75%, 4/15/14 (144A) 3,695,294 $ 7,026,219 Tobacco - 0.3% 1,230,000 Alliance One International, Inc., 8.5%, 5/15/12 (14$ 1,257,675 Total Food, Beverage & Tobacco $17,746,269 Health Care Equipment & Services - 6.9% Health Care Equipment & Services - 0.6% 2,875,000 Accellent, Inc., 10.5%, 12/1/13 $ 2,853,438 Health Care Supplies - 0.6% 2,900,000 (a) Medical Services Co., 12.856%, 10/15/11 $ 2,813,000 Health Care Services - 2.2% 2,160,000 AMR HoldCo/Emcare HoldCo, 10.0%, 2/15/15 $ 2,332,800 4,055,000 Rural/Metro Corp., 9.875%, 3/15/15 4,257,750 1,880,000 (b) Surgical Care Affiliates, Inc., 8.875%, 7/15/15 (144 1,870,600 1,475,000 Surgical Care Affiliates, Inc., 10.0%, 7/15/17 (144A 1,471,313 $ 9,932,463 Health Care Facilities - 2.4% 1,200,000 Community Health Systems, Inc., 8.875%, 7/15/15 (14$ 1,216,500 3,800,000 Hanger Orthopedic Group, Inc., 10.25%, 6/1/14 4,085,000 2,555,000 (b) HCA, Inc., 10.375%, 11/15/16 (144A) 2,746,625 130,000 Psychiatric Solutions, Inc., 7.75%, 7/15/15 128,538 2,000,000 Psychiatric Solutions, Inc., 7.75%, 7/15/15 (144A) 1,977,500 575,000 Sun Healthcare Group, Inc., 9.125%, 4/15/15 (144A) 598,000 $10,752,163 Managed Health Care - 1.1% 4,400,000 Multiplan, Inc., 10.375%, 4/15/16 (144A) $ 4,686,000 Total Health Care Equipment & Services $31,037,064 Pharmaceuticals & Biotechnology & Life Sciences - 2.9% Biotechnology - 0.7% 3,500,000 (l) Angiotech Pharmaceuticals, Inc., 7.75%, 4/1/14 $ 3,298,750 Pharmaceuticals - 2.2% 2,000,000 Phibro Animal Health Corp., 10.0%, 8/1/13 (144A) $ 2,090,000 3,000,000 Phibro Animal Health Corp., 13.0%, 8/1/14 (144A) 3,165,000 4,317,000 Warner Chilcott Corp., 8.75%, 2/1/15 4,435,718 $ 9,690,718 Total Pharmaceuticals & Biotechnology & Life Scienc$12,989,468 Banks - 0.4% Diversified Banks - 0.4% 1,750,000 (a)(ALB Finance BV, 9.375% $ 1,677,288 Total Banks $ 1,677,288 Diversified Financials - 6.5% Other Diversified Financial Services - 0.2% 605,000 PGS Solutions, Inc., 9.625%, 2/15/15 (144A) $ 611,744 Specialized Finance - 2.6% 7,950,000 GATX Financial Corp., 8.875%, 6/1/09 $ 8,401,568 Consumer Finance - 2.8% 4,770,000 ACE Cash Express, Inc., 10.25%, 10/1/14 (144A) $ 4,877,325 1,300,000 AmeriCredit Corp., 8.5%, 7/1/15 (144A) 1,309,750 3,000,000 Ford Motor Credit Co., 7.875%, 6/15/10 2,999,424 3,000,000 (a) Ford Motor Credit Co., 9.806%, 4/15/12 3,215,133 $12,401,632 Investment Banking & Brokerage - 0.9% 4,205,000 Algoma Acquisition Corp., 9.875%, 6/15/15 (144A) $ 4,183,975 Total Diversified Financials $25,598,919 Insurance - 3.7% Insurance Brokers - 0.9% 3,150,000 HUB International Holdings, Inc., 10.25%, 6/15/15 ($ 3,031,875 885,000 U.S.I. Holdings Corp., 9.75%, 5/15/15 (144A) 880,575 $ 3,912,450 Life & Health Insurance - 1.3% 5,725,000 Presidential Life Corp., 7.875%, 2/15/09 $ 5,725,000 Multi-Line Insurance - 1.2% 5,300,000 Allmerica Financial Corp., 7.625%, 10/15/25 $ 5,507,967 Reinsurance - 0.3% 750,000 (a) Foundation Re, Ltd., 9.46%, 11/24/08 (144A) $ 712,980 500,000 (a) Residential Reinsurance 2005, 13.81%, 6/6/08 469,900 $ 1,182,880 Total Insurance $16,328,297 Software & Services - 3.5% IT Consulting & Other Services - 1.0% 4,450 (e) MSX International UK/MXS International Business Ser$ 4,516,750 Data Processing & Outsourced Services - 1.3% 640,000 iPayment, Inc., 9.75%, 5/15/14 $ 640,000 5,250,000 Pegasus Solutions, Inc., 10.5%, 4/15/15 (144A) 5,250,000 $ 5,890,000 Application Software - 0.2% 810,000 Open Solutions, Inc., 9.75%, 2/1/15 (144A) $ 818,100 Computer Hardware - 1.0% 2,900,000 (b) CHR Intermediate Holding Corp., 12.61%, 6/1/13 (144$ 2,889,125 3,750,000 Compucom Systems, Inc., 12.0%, 11/1/14 (144A) 4,031,250 $ 6,920,375 Total Software & Services $18,145,225 Technology Hardware & Equipment - 3.4% Computer Hardware - 0.7% 2,945,000 Activant Solutions, Inc., 9.5%, 5/1/16 $ 2,893,462 Office Electronics - 2.7% 11,830,000 Xerox Capital Trust I, 8.0%, 2/1/27 $12,144,832 Total Technology Hardware & Equipment $15,038,294 Semiconductors & Semiconductor Equipment - 0.3% Semiconductors - 0.3% 1,300,000 (a) Freescale Semiconductor, Inc., 9.235%, 12/15/14 (14$ 1,254,500 Total Semiconductors & Semiconductor Equipment $ 1,254,500 Telecommunication Services - 14.0% Alternative Carriers - 0.6% 2,500,000 PAETEC Holding Corp., 9.5%, 7/15/15 (144A) $ 2,500,000 Integrated Telecommunication Services - 2.5% 7,149,000 Eschelon Operating Co., 8.375%, 3/15/10 $ 6,907,721 3,720,000 GC Impsat Holdings I Plc, 9.875%, 2/15/17 (144A) 3,766,500 691,000 Tele Norte Leste Participacoes SA, 8.0%, 12/18/13 725,550 $11,399,771 Wireless Telecommunication Services - 10.9% 4,165,000 Broadview Networks Holdings, Inc., 11.375%, 9/1/12 $ 4,414,900 1,625,000 Cell C Property, Ltd., 11.0%, 7/1/15 (144A) 1,523,437 2,855,000 (a) Cleveland Unlimited, Inc., 13.61%, 12/15/10 (144A) 3,126,225 6,900,000 Cricket Communications, Inc., 9.375%, 11/1/14 7,124,250 1,500,000 Digicel, Ltd., 9.25%, 9/1/12 (144A) 1,580,625 2,500,000 (a) Hellas Telecommunications Luxembourg II, 11.106%, 1/ 2,575,000 5,000,000 Hughes Network Systems LLC, 9.5%, 4/15/14 5,225,000 2,200,000 (d) Inmarsat Finance II Plc, 0.0%, 11/15/12 2,098,250 3,200,000 (d) Intelsat Intermediate Holding Co., Ltd., 0.0%, 2/1/1 2,632,000 5,150,000 Mobifon Holdings BV, 12.5%, 7/31/10 5,497,625 3,230,000 Mobile Telesystems, 9.75%, 1/30/08 (144A) 3,287,494 3,000,000 (a) Rural Cellular Corp., 11.106%, 11/1/12 3,090,000 3,200,000 Stratos Global Corp., 9.875%, 2/15/13 3,400,000 3,020,000 True Move Co, Ltd., 10.75%, 12/16/13 (144A) 3,201,200 $48,776,006 Total Telecommunication Services $62,675,777 Utilities - 2.3% Electric Utilities - 1.9% 2,000,000 Aes Chivor SA ESP, 9.75%, 12/30/14 (144A) $ 2,265,000 1,500,000 Mirant JPSCo. Finance, Ltd., 11.0%, 7/6/16 (144A) 1,650,000 4,436,159 Ormat Funding Corp., 8.25%, 12/30/20 4,524,882 $ 8,439,882 Multi - Utilities - 0.4% 2,175,000 (a) Power Contract Financing III LLC, 0.681%, 2/5/10 (1$ 1,805,250 Total Utilities $10,245,132 TOTAL CORPORATE BONDS & NOTES (Cost $490,832,406) $517,712,888 CONVERTIBLE BONDS & NOTES - 0.4% of Net Assets Software & Services - 0.4% Systems Software - 0.4% 1,400,000 Macrovision Corp., 2.625%, 8/15/11 (144A) $ 1,743,000 TOTAL CONVERTIBLE BONDS & NOTES (Cost $1,400,000) $ 1,743,000 MUNICIPAL BONDS - 7.1% of Net Assets Indiana - 1.4% 1,650,000 East Chicago Industrial Pollution Control Revenue, $ 1,730,108 4,250,000 Indiana Development Finance Authority Revenue, 5.75% 4,372,102 $ 6,102,210 Michigan - 0.0% 3,000,000 Wayne Charter County, Special Airport Facilities Re$ 0 New Jersey - 2.1% 4,525,000 New Jersey Economic Development Authority Revenue, $ 4,793,604 4,000,000 Tobacco Settlement Financing Corp., 7.0%, 6/1/41 4,622,480 $ 9,416,084 New York - 0.9% 3,475,000 New York City Industrial Development Agency, Britis$ 3,819,720 North Carolina - 1.5% 4,800,000 Charlotte, Special Facilities Revenue, Charlotte/Do$ 4,793,664 2,000,000 Charlotte, Special Facilities Revenue, Charlotte/Dou 2,119,680 $ 6,913,344 Ohio - 0.3% 1,275,000 (a) Ohio Air Quality Development Authority Revenue, 10.$ 1,275,000 Texas - 0.9% 3,200,000 (f) San Antonio, Texas, Electric & Gas, RIB, 7.915%, 2/$ 3,993,568 TOTAL MUNICIPAL BONDS (Cost $24,331,532) $31,519,926 MUNICIPAL COLLATERALIZED DEBT OBLIGATION - 0.7% of Net Assets 3,300,000 (g) Non-Profit Preferred Funding Trust I, 12.5%, 9/15/3$ 3,298,581 TOTAL MUNICIPAL COLLATERALIZED DEBT OBLIGATION (Cost $3,293,400) $ 3,298,581 SOVEREIGN DEBT OBLIGATIONS - 2.0% of Net Assets Brazil - 0.8% 4,800,000,0(d) Banco Nacional de Desenvolimento Bndes, 8.0%, 4/28/$ 3,582,364 Ecuador - 0.6% 3,515,000 (d) Federal Republic of Ecuador, 10.0%, 8/15/30 (144A) $ 2,882,300 Russia - 0.6% 2,308,400 (d) Russia Government International Bond, 7.5%, 3/31/30$ 2,542,703 TOTAL SOVEREIGN DEBT OBLIGATIONS (Cost $6,125,575) $ 9,007,367 FLOATING RATE LOAN INTERESTS - 5.8% of Net Assets(h) Energy - 0.2% Oil & Gas Exploration & Production - 0.2% 710,000 SandRidge Energy, Inc., Unsecured Bridge Term Loan,$ 727,750 300,000 Venoco, Inc., Second Lien Term Loan, 9.36%, 9/20/11 303,000 Total Energy $ 1,030,750 Capital Goods - 0.5% Building Products - 0.4% 2,000,000 Custom Building Products, Inc., Second Lien Term Lo$ 1,997,084 Construction & Farm Machinery & Heavy Trucks - 0.1% 397,920 Rental Service Corp., Second Lien Initial Term Loan$ 400,532 Total Capital Goods $ 2,397,616 Automobiles & Components - 0.9% Auto Parts & Equipment - 0.9% 3,885,000 Lear Corp., U.S. Term Loan, 2.75%, 7/2/14 $ 3,854,514 Total Automobiles & Components $ 3,854,514 Consumer Durables & Apparel - 0.7% Homebuilding - 0.7% 2,850,000 LandSource Communities Development LLC, Second Lien$ 2,874,937 Total Consumer Durables & Apparel $ 2,874,937 Household & Personal Products - 0.1% Household Products - 0.1% 500,000 Huish Detergents, Inc., Second Lien Term Loan, 9.57$ 499,375 Total Household & Personal Products $ 499,375 Health Care Equipment & Services - 1.1% Health Care Equipment & Services - 0.4% 1,800,000 Niagara Corp., Term Loan B, 5.0%, 6/29/14 $ 1,800,000 Health Care Facilities - 0.7% 3,175,000 Community Health Systems, Inc., Sr. Unsecured Bridg$ 3,185,417 Total Health Care Equipment & Services $ 4,985,417 Diversified Financials - 1.2% Other Diversified Financial Services - 1.2% 2,500,000 J.G. Wentworth, Second Lien Term Loan, 10.35%, 3/1/$ 2,512,500 2,009,513 Louis Topco, Ltd., Term Loan, 11.863%, 6/1/17 2,732,039 Total Diversified Financials $ 5,244,539 Insurance - 0.5% Multi-Line Insurance - 0.5% 2,250,000 AmWins Group, Inc., Second Lien Term Loan, 5.75%, 6$ 2,254,219 Total Insurance $ 2,254,219 Utilities - 0.6% Independent Power Producers & Energy Traders - 0.6% 817,560 NRG Energy, Inc., Credit-Linked Deposit, 1.75%, 2/1$ 815,297 1,968,623 NRG Energy, Inc., Term Loan, 1.75%, 2/1/13 1,963,174 Total Utilities $ 2,778,471 TOTAL FLOATING RATE LOAN INTERESTS (Cost $25,747,317) $25,919,838 FIXED RATE LOAN INTERESTS - 0.3% of Net Assets Energy - 0.3% Oil & Gas Exploration & Production - 0.3% 1,070,000 SandRidge Energy, Inc., Unsecured Bridge Term Loan,$ 1,096,750 TOTAL FIXED RATE LOAN INTERESTS (Cost $1,070,000) $ 1,096,750 Shares COMMON STOCKS - 0.5% of Net Assets Transportation - 0.3% Airlines - 0.3% 62,126 (l) Northwest Airlines Corp. $ 1,379,197 Total Transportation Pharmaceuticals & Biotechnology & Life Sciences - 0.2% Pharmaceuticals - 0.2% 17,818 Teva Pharmaceutical Industries, Ltd. (A.D.R.) $ 734,993 Total Pharmaceuticals & Biotechnology & Life Sciences TOTAL COMMON STOCKS (Cost $2,886,220) $ 2,114,190 WARRANTS - 0.1% of Net Assets (i) Energy - 0.1% Oil & Gas Drilling - 0.1% 2,500,000 Norse Energy Corp. ASA - CW11, Expires 7/14/11 $ 529,092 Total Energy $ 529,092 Materials - 0.0% Forest Products - 0.0% 1,645 (g) Mandra Forestry Holdings, Ltd. - CW13, Expires 5/15$ 0 Total Materials $ 0 Transportation - 0.0% Railroads - 0.0% 4,525 Atlantic Express Transportation Corp., Expires 4/15$ 6,787 Total Transportation $ 6,787 TOTAL WARRANTS (Cost $523,408) $ 535,879 Principal Amount USD ($) Value TEMPORARY CASH INVESTMENTS - 4.7% of Net Assets Repurchase Agreement - 1.7% 7,500,000 Lehman Brothers Holdings, Inc., 4.0%, dated 6/29/07, repurchase price of $8,700,000 plus accrued interest on 7/2/07 collateralized by $5,880,000 U.S$7,500,000 Shares Security Lending Collateral - 3.0% 13,684,012 Securities Lending Investment Fund, 5.284% $13,684,012 TOTAL TEMPORARY CASH INVESTMENTS (Cost $21,184,012) $21,184,012 TOTAL INVESTMENTS IN SECURITIES - 137.8% (Cost $579,661,977) (j) (k) $615,389,852 OTHER ASSETS AND LIABILITIES - (3.9)% $(17,657,112) PREFERRED SHARES AT REDEMPTION VALUE, INCLUDING DIVIDENDS PAYABLE - (33.9)% $(151,172,916) NET ASSETS APPLICABLE TO COMMON SHAREOWNERS - 100.0$446,559,824 NR Security not rated by S&P or Moody's. (144A) Security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold normally to qualified institutional buyers in a transaction exempt from registration. At June 30, 2007, the value of these securities amounted to $222,979,336 or 49.9% of total net assets applicable to common shareowners. (a) Floating rate note. The rate shown is the rate at June 30, 2007. (b) Represents a pay-in-kind security which may pay interest in additional principal. (c) Security is a perpetual bond and has no definite maturity date. (d) Debt obligation initially issued at one coupon which converts to a higher coupon at a specific date. The rate shown is the rate at June 30, 2007. (e) Security is priced as a unit. (f) The interest rate is subject to change periodically and inversely based upon prevailing market rates. The rate shown is the rate at June 30, 2007. (g) Indicates a security that has been deemed illiquid. The aggregate cost of illiquid securities is $3,293,400. The aggregate value $3,298,581 represents 0.7% of the net assets. (h) Floating rate loan interests in which the Trust invests generally pay interest at rates that are periodically redetermined by reference to a base lending rate plus a premium. These base lending rates are generally (i) the lending rate offered by one or more major European banks, such as LIBOR (London InterBank Offered Rate), (ii) the prime rate offered by one or more major United States banks, (iii) the certificate of deposit or (iv) other base lending rates used by commercial lenders. The rate shown is the coupon rate at June 30, 2007. (i) Non-income producing. (j) At June 30, 2007, the net unrealized gain on investments based on cost for federal income tax purposes of $578,941,127 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $39,124,973 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (2,676,248) Net unrealized gain $36,448,725 For financial reporting purposes net unrealized gain was $36,725,890 and cost of investments aggregated $579,378,988. (k) Distribution of investments by country of issue, as a percentage of total holdings, is as follows: United States 76 % Canada 4 Brazil 4 Norway 3 Great Britain 2 Netherlands 2 Mexico 2 Cayman Islands 1 Luxembourg 1 Virgin Islands 1 Germany 1 Bermuda 1 Australia 1 Thailand 1 Ecuador 1 Russia 0 Colombia 0 Jamaica 0 South Africa 0 Singapore 0 Israel 0 100 % (l) At June 30, 2007, the following securities were out on loan: Principal Amount Description Market Value 1,605,000 Angiotech Pharmaceuticals, Inc., 7.75%, 4/1/14 $1,512,712 5,905,350 Cooper-Standard Automotive, Inc., 8.375%, 12/15/14 5,506,739 1,569,490 Georgia Gulf Corp., 10.75%, 10/15/16 1,561,643 1,465,200 TOUSA, Inc., 10.375%, 7/1/12 1,230,768 89,000 WCI Communities, Inc., 7.875%, 10/1/13 81,880 594,000 William Lyon Homes, Inc., 7.5%, 2/15/14 498,960 1,633,500 Yankee Acquisition Corp., 9.75%, 2/15/17 1,580,411 Shares 61,505 Northwest Airlines Corp. 1,365,411 $13,338,524 (A.D.R) American Depositary Receipt RIB Residual Interest Bonds For the period ended June 30, 2007, the Trust had unfunded loan commitments of $717,011 which would be extended at the option of the borrower, pursuant to the following loan agreements: Unfunded Borrower Commitment NRG Holdings, Inc., HoldCo Delayed Draw Term Loan $ 717,011 $ 717,011 ITEM 2. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR 270.30a-3(c))) as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph, based on their evaluation of these controls and procedures required by Rule 30a-3(b) under the Act (17 CFR270.30a-3(b))) and Rule 13a-15(b) or 15d-15(b) under the Exchange Act (17 CFR240.13a-15(b) or 240.15d-15(b)). The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose any change in the registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR270.30a-3(d)) that occurred during the registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 3. EXHIBITS. (a) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Pioneer High Income Trust By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date August 29, 2007 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date August 29, 2007 By (Signature and Title)* /s/ Vincent Nave Vincent Nave, Treasurer Date August 29, 2007 * Print the name and title of each signing officer under his or her signature.