| Inspiration Corporation, Chicago | 9 | $4.0M | City of Chicago |
| Inspire Medical Systems, Inc. | 7 | $144K | Department of Veterans Affairs |
| Inspirnetics, Inc | 12 | $133K | Defense Logistics Agency |
| Installation Services LLC | 6 | $1.0M | Office of the Secretary |
| Institut Za Razvoj Mladih Kult | 7 | $11M | Agency for International Development |
| Institute for Community Living Inc. | 13 | $970M | New York City |
| Institute for Forensic Psychology Inc | 5 | $3.7M | MTA Procurements |
| The Institute for Making A Happy Home | 3 | $3K | Department of the Army |
| Institute for Nonviolence Chicago | 7 | $3.1M | City of Chicago |
| The Institute for Public Procurement (NIGP) | 6 | $1K | Oregon State Treasury |
| Institute for the Puerto Rican Hispanic Elderly Inc | 3 | $26M | New York City |
| Institute for Women Today | 10 | $6.8M | City of Chicago |
| Institute of Electrical & Electronics Engineers Inc | 4 | $527K | Office of Procurement Operations |
| The Institute of Internal Auditors | 7 | $22K | Oregon State Treasury |
| Institute of Internal Auditors Inc Chicago Chapter | 3 | $47K | City of Chicago |
| Institute on Aging | 7 | $7.0M | San Francisco |
| Institutional Limited Partners Association | 3 | $2K | Oregon State Treasury |
| Institutional Service & Consultants Inc | 134 | $767K | City-Parish of Baton Rouge |
| Institutional Society of Risk Professionals (ISRP) | 7 | $6K | Oregon State Treasury |
| Instituto Familiar de la Raza Inc | 10 | $44M | San Francisco |
| Instron | 4 | $276K | MTA Procurements |
| Instrotek Inc | 6 | $3K | City of Los Angeles Controller |
| Instructure, Inc. | 6 | $5 | State of Washington |
| Instrumart | 3 | $70K | MTA Procurements |
| Instrument Piping Technologies LLC | 4 | $2K | City-Parish of Baton Rouge |
| Insulation Sources Inc | 4 | $16K | Defense Logistics Agency |
| Insurance Auto Auctions, Inc. | 5 | $9.4M | Federal Acquisition Service |
| Insurance Certificate Administrators, LP | 3 | $2K | City of Mesquite |
| Intact Technology Inc | 3 | $7.5M | MTA Procurements |
| Intec Solutions Inc | 3 | $82K | San Francisco |
| Integra Lifesciences Corp | 3 | $71K | NY State Authorities |
| Integrated Athletic Initiative Corp | 5 | $17M | New York City |
| Integrated Business & Technical Consultants, Inc. | 6 | $24M | Agency for International Development |
| Integrated Construction Enterprises Inc | 3 | $7.1M | Smithsonian Institution |
| Integrated Data Services, LLC | 16 | $8.4M | Department of the Air Force |
| Integrated Display Systems LLC | 12 | $4.3M | MTA Procurements |
| Integrated Environmental Solutions, Inc. | 5 | $4.8M | Department of the Army |
| Integrated Finance and Accounting Solutions, LLC. | 20 | $26M | Department of State |
| Integrated Maintenance and Bus Services LLC | 5 | $3.6M | Department of Veterans Affairs |
| Integrated Management Strategies LLC | 5 | $17M | Defense Health Agency |
| Integrated Medical Solutions, LLC | 3 | $87K | Federal Prison System / Bureau of Prisons |
| Integrated Modular Solutions, LLC | 4 | $5.8M | Department of the Air Force |
| Integrated Procurement Technologies | 110 | $16M | Defense Logistics Agency |
| Integrated Security Solutions Inc | 3 | $4.7M | Department of the Army |
| Integrated Security Technologies Inc. | 4 | $399K | Department of the Navy |
| Integrated Solutions Consulting Corporation | 8 | $6.6M | City of Chicago |
| Integrated Solutions for Systems, Inc. | 3 | $3.2M | Department of the Air Force |
| Integrated Solutions Group, LLC | 15 | $15 | State of Washington |
| Integrated Trans Joint Venture LLC | 3 | $7.1M | Department of Veterans Affairs |
| Integrated Wireless Technologies LLC | 5 | $333K | MTA Procurements |
| Integration Charter Schools | 4 | $21M | New York City |
| Integration Innovation Inc | 6 | $38M | Department of the Navy |
| Integration Technologies Group, Inc. | 20 | $4.9M | Defense Health Agency |
| Integrity General Contractors, Inc. | 3 | $300K | New York City |
| Integrity Global Inc. | 4 | $35M | Agency for International Development |
| Integrity National Corporation | 5 | $912K | Federal Aviation Administration |
| Integriward, LLC | 5 | $12M | Environmental Protection Agency |
| Intellidyne, L.l.c. | 5 | $126M | Defense Health Agency |
| Intelligent Manufacturing Solutions, LLC | 5 | $1.6M | Defense Logistics Agency |
| Intelligent Polymer Solutions, LLC | 15 | $9.0M | MTA Procurements |
| Intelligent Procurement Solutions, LLC | 4 | $24K | Defense Logistics Agency |
| Intelligent Security Systems Corporation | 6 | $1.3M | MTA Procurements |
| Intelligent Technologies & Services Inc | 5 | $892K | San Francisco |
| Intellisense Systems Inc | 10 | $8.0M | Department of the Air Force |
| Intentional Endowments Network | 3 | $60 | Oregon State Treasury |
| Intents Emergency Response LLC | 3 | $78K | Forest Service |
| Inter-City Supply Co Inc | 9 | $5.2M | Cook County |
| Inter City Tire and Auto Center, Inc. | 3 | $129K | MTA Procurements |
| Inter-Con Security Systems | 4 | $424M | New York City |
| Inter Laperuta JV | 3 | $16M | New York City |
| Inter-Pacific Inc. | 5 | $662K | Department of the Air Force |
| Inter-Tribal Council of Arizona Inc | 7 | $1.0M | Indian Health Service |
| Interactive Communications Solutions Group, Inc. | 5 | $262K | Internal Revenue Service |
| Interamerican Foods Corporation | 18 | $33M | Agricultural Marketing Service |
| Intercomp Co | 4 | $91K | Department of the Army |
| Interdynamics Pty Ltd | 6 | $246K | MTA Procurements |
| Interethnica Inc | 9 | $4.5M | San Francisco |
| Interface Products Company Inc | 3 | $175K | MTA Procurements |
| Intergraph Corp | 5 | $5.5M | MTA Procurements |
| Interior Exterior Enterprises LLC | 6 | $6K | City-Parish of Baton Rouge |
| Interior Move Consultants Inc. | 6 | $7.8M | New York City |
| Interior Solutions of Arizona, L.l.c. | 3 | $34K | Department of the Air Force |
| Intermountain Lock and Security Supply | 13 | $3K | City of Mesquite |
| InterMusic SF | 4 | $172K | San Francisco |
| Internal Data Resources, Inc. | 37 | $463K | Texas DIR |
| International Association of Assessing Officers | 5 | $203K | New York City |
| International Business Initiatives LLC | 6 | $67M | Agency for International Development |
| International Business Machines Corporation | 35 | $395M | New York City |
| International Business Machines Corporation (IBM) | 39 | $107K | Texas DIR |
| International Centre for Pension Management | 4 | $36K | Oregon State Treasury |
| International Code Council Inc | 8 | $2.0M | City of Mesquite |
| International Data Corporation | 3 | $292K | New York City |
| International Development Group Advisory Services, LLC | 4 | $31M | Agency for International Development |
| International Fleet Sales, Inc. | 3 | $4K | Defense Logistics Agency |
| International Foundation of Employee Benefit Plans Inc | 6 | $15K | City of Los Angeles Controller |
| International Insignia Corp. | 4 | $225K | Defense Logistics Agency |
| International Institute of Business Analysis | 5 | $2K | Oregon State Treasury |
| International Integrated Solutions Ltd. | 8 | $1.1M | MTA Procurements |
| International Line Builders Inc | 3 | $721K | City of Los Angeles Controller |
| International Living Future Institute (Ilfi) | 5 | $4K | Oregon State Treasury |