| Horizon Therapeutics USA, Inc. | Deerfield, IL | $307M | 2,560 | 2024 |
| Vyaire Medical Payroll LLC | Mettawa, IL | $120M | 1,044 | 2025 |
| Northwest Community Hospital | Evanston, IL | $111M | 1,180 | 2024 |
| Bdo USA, P.C. | Chicago, IL | $76M | 832 | 2024 |
| West Central Anesthesiology Group, Ltd. | Naperville, IL | $71M | 40 | 2024 |
| The Horton Group, Inc. | Orland Park, IL | $59M | 478 | 2024 |
| Horwood Marcus & Berk Chartered | Chicago, IL | $55M | 137 | 2024 |
| Enlivant Aid Es, LLC | Chiago, IL | $46M | 8,383 | 2023 |
| American Hotel Register Company | Vernon Hills, IL | $42M | 391 | 2023 |
| Insurance Information Technologies, Inc. | Naperville, IL | $41M | 212 | 2023 |
| Novack and Macey LLP | Chicago, IL | $32M | 62 | 2023 |
| Lurie Children's Surgical Foundation | Chicago, IL | $31M | 87 | 2025 |
| Its Technologies & Logistics, LLC | Darien, IL | $28M | 884 | 2024 |
| Datair Employee Benefit Systems, Inc. | Westmont, IL | $28M | 36 | 2025 |
| Alton Steel, Inc. | Alton, IL | $28M | 274 | 2026 |
| J.H. Ellwood & Associates, Inc. | Chicago, IL | $26M | 83 | 2024 |
| Ki Industries, Inc. | Berkeley, IL | $26M | 49 | 2024 |
| Inland Bancorp,inc. | Oak Brook, IL | $26M | 306 | 2023 |
| L&g Law Group LLP | Chicago, IL | $25M | 128 | 2023 |
| True Partners Consulting, LLC | Chicago, IL | $25M | 269 | 2023 |
| Fuchs & Roselli, Ltd | Chicago, IL | $22M | 49 | 2025 |
| Marine Bank | Springfield, IL | $21M | 235 | 2023 |
| Linn-Mathes Inc. | Chicago, IL | $21M | 20 | 2024 |
| Karbal, Cohen, Economou, Silk & Dunne | Chicago, IL | $21M | 27 | 2026 |
| Radiology Imaging Specialists, Ltd. | Evergreen Park, IL | $21M | 13 | 2024 |
| Tech-Syn Corporation & Subsidiaries | Bloomingdale, IL | $20M | 53 | 2023 |
| Midwest Anesthesiologists, Ltd. | Naperville, IL | $20M | 34 | 2023 |
| Krd, Ltd. | Schaumburg, IL | $20M | 115 | 2025 |
| The Womens Group of Northwestern, Sc | Chicago, IL | $20M | 81 | 2025 |
| Paragon Marketing Group, LLC | Chicago, IL | $19M | 102 | 2025 |
| Network Innovations, LLC, DBA Nitel, LLC | Chicago, IL | $19M | 139 | 2025 |
| Town and Country Financial Corporation | Springfield, IL | $19M | 230 | 2023 |
| Aurora Radiology Consultants, S.C. | Aurora, IL | $19M | 19 | 2025 |
| Adler Murphy & McQuillen LLP | Chicago, IL | $19M | 51 | 2023 |
| Gentry Medical Solutions, Inc. | Springfield, IL | $19M | 73 | 2025 |
| Platinum Home Mortgage Corporation | Hoffman Estates, IL | $18M | 274 | 2023 |
| Midwest Physicians Alliance, Inc. | Palos Park, IL | $18M | 94 | 2023 |
| Wsj Enterprises, Inc. | Kildeer, IL | $18M | 4 | 2023 |
| Elmhurst Medical Associates, LLC | Elmhurst, IL | $17M | 9 | 2025 |
| Querrey & Harrow, Ltd. | Chicago, IL | $16M | 46 | 2025 |
| Westwood Management Corporation | Chicago, IL | $16M | 4 | 2024 |
| Appraisal Research Counselors, Ltd. | Chicago, IL | $16M | 29 | 2024 |
| McHenry Radiologists and Imaging Associates, S.C. | Oak Brook, IL | $15M | 24 | 2024 |
| Travelers Immigrants Aid S Heartland Alliance for Human Needs and Huma | Chicago, IL | $15M | 1,008 | 2025 |
| Bancorp Financial, Inc. | Oak Brook, IL | $15M | 231 | 2025 |
| Kellstrom Commercial Aerospace, Inc. | Roselle, IL | $15M | 156 | 2025 |
| Shepard Schwartz & Harris LLP | Chicago, IL | $15M | 65 | 2023 |
| Graphic Arts Finishing Company | Melrose Park, IL | $15M | 27 | 2024 |
| Subway J.P.W., Inc. | Rockford, IL | $13M | 17 | 2025 |
| Burris Equipment Co. | Waukegan, IL | $13M | 95 | 2024 |
| A-Korn Roller, Inc. | Chicago, IL | $13M | 62 | 2025 |
| Piccione, Keeley & Associates, Ltd. | Geneva, IL | $13M | 14 | 2025 |
| Bansley & Kiener, L.L.P. | Chicago, IL | $13M | 59 | 2023 |
| Arrow Gear LLC | Downers Grove, IL | $13M | 277 | 2023 |
| Elgin Academy | Elgin, IL | $13M | 214 | 2024 |
| Standard Equipment Company | Elmhurst, IL | $13M | 47 | 2024 |
| Reed-Union Corporation | Northbrook, IL | $12M | 3 | 2024 |
| Claro Healthcare, LLC | Chicago, IL | $12M | 220 | 2023 |
| Mueller Financial Services Inc | Elgin, IL | $12M | 50 | 2025 |
| Knox & Schneider, Inc. | Chicago, IL | $12M | 22 | 2024 |
| Small Newspaper Group, Inc. | Kankakee, IL | $12M | 151 | 2025 |
| Ruettiger, Tonelli & Associates, Inc. | Shorewood, IL | $12M | 23 | 2023 |
| R.T. Milord Company | Bridgeview, IL | $12M | 25 | 2024 |
| Sertifi | Chicago, IL | $12M | 164 | 2025 |
| Tall Tree Foods, Inc. | Glenview, IL | $11M | 176 | 2025 |
| A&r Katz Management Inc | Northbrook, IL | $11M | 11 | 2026 |
| Joliet Radiological Service Corp | Joliet, IL | $11M | 10 | 2023 |
| Satyendra K. Humad | Evanston, IL | $11M | 3 | 2025 |
| Construction Technology Laboratories, Inc. | Skokie, IL | $11M | 129 | 2024 |
| Fiberteq, LLC | Danville, IL | $11M | 102 | 2023 |
| Hyzon Motors USA, Inc. | Bolingbrook, IL | $11M | 221 | 2025 |
| First Centennial Mortgage Corporation | Aurora, IL | $11M | 148 | 2024 |
| Amperage Electrical Supply, Inc. | Roselle, IL | $11M | 97 | 2023 |
| Equity Commonwealth Management L | Chicago, IL | $11M | 31 | 2025 |
| Ophthalmology Associates, Ltd | Cherry Valley, IL | $11M | 23 | 2026 |
| Tfaz Group, Inc. | Oak Lawn, IL | $11M | 7 | 2026 |
| The Ear, Nose and Throat Center | Niles, IL | $10M | 28 | 2025 |
| Strube Celery and Vegetable Company | Chicago, IL | $10M | 29 | 2025 |
| Haran & Associates, Ltd. | Mount Prospect, IL | $10M | 15 | 2025 |
| Big 3 Precision Products, Inc. | Centralia, IL | $10M | 313 | 2023 |
| Scandaglia Ryan LLP | Chicago, IL | $10M | 14 | 2025 |
| Indak Manufacturing Corporation | Northbrook, IL | $10M | 187 | 2024 |
| Northwest Orthopedic Surgery | Arlington Heights, IL | $10M | 47 | 2025 |
| Gavani and Kanuri M.D., S.C. | Oak Brook, IL | $9.8M | 7 | 2024 |
| Arcola First Bank | Arcola, IL | $9.8M | 27 | 2025 |
| Ferrara Candy Company | Chicago, IL | $9.6M | 769 | 2023 |
| Goldman Ismail Tomaselli Brennan & Baum LLP | Chicago, IL | $9.6M | 33 | 2025 |
| R-P-W Obstetrics & Gynecology, S.C. | Elmhurst, IL | $9.6M | 24 | 2023 |
| Day & Robert, P.C. | Naperville, IL | $9.6M | 4 | 2025 |
| Ctm Advisors, Ltd. DBA Ctm Cpas & Business Advisors | Lincolnshire, IL | $9.5M | 54 | 2025 |
| Advanced Oral & Maxillofacial Surgery, Ltd. | Elmhurst, IL | $9.5M | 31 | 2023 |
| Sanford L. Barr, D.D.S., Ltd. | Chicago, IL | $9.5M | 17 | 2025 |
| Elmhurst Auto Group Ltd DBA Elmhurst Toyota | Elmhurst, IL | $9.5M | 134 | 2023 |
| Lawn Funeral Home, Ltd. | Orland Park, IL | $9.3M | 12 | 2024 |
| Mtco Corporation | Metamora, IL | $9.2M | 67 | 2026 |
| J&r Dairy Service, Inc. | Bridgeview, IL | $9.2M | 164 | 2024 |
| Guardian Anesthesia Associates, S.C. | Naperville, IL | $9.1M | 15 | 2025 |
| Morrison & Morrison, Ltd. | Chicago, IL | $9.1M | 27 | 2025 |
| Rockford Spine Center, Ltd. | Rockford, IL | $9.1M | 59 | 2023 |
| Rappaport Reiches Capital Management, LLC | Skokie, IL | $9.0M | 14 | 2026 |
| Sunrise Electric Holdings LLC | Addison, IL | $9.0M | 81 | 2024 |
| Krd, Ltd. | Schaumburg, IL | $9.0M | 95 | 2025 |
| Big Monster Toys | Woodridge, IL | $8.8M | 27 | 2024 |
| Senb Bank | Moline, IL | $8.7M | 137 | 2024 |
| Elmhurst Emergency Medical Services, Ltd | Wheaton, IL | $8.7M | 21 | 2025 |
| Gagen Macdonald LLC C/O Carnow and Associates, Ltd. | Northfield, IL | $8.6M | 92 | 2023 |
| Petty & Bielik Orthodontics, LLP | Oak Lawn, IL | $8.6M | 29 | 2024 |
| Vogue Tyre & Rubber Company | Mount Prospect, IL | $8.5M | 67 | 2025 |
| Bloomington Radiology, S.C. | Normal, IL | $8.5M | 9 | 2023 |
| Suburban Surgical Associates, Ltd. | Hinsdale, IL | $8.4M | 23 | 2025 |
| Law Offices of Joel Weisman, P.C. | Northbrook, IL | $8.4M | 3 | 2024 |
| Adams Machinery Company | Lake Bluff, IL | $8.3M | 8 | 2025 |
| Genesis Automation, Inc. | St Charles, IL | $8.3M | 49 | 2024 |
| Davies Pacheco & Murphy Advertising Agency | Naperville, IL | $8.2M | 55 | 2025 |
| Entara Corporation | Chicago, IL | $8.2M | 123 | 2025 |
| Medwest Associates, Inc | Burr Ridge, IL | $8.2M | 128 | 2024 |
| North Fork Holdings, Inc. | Schaumburg, IL | $8.2M | 283 | 2024 |
| Al's Automotive Supply, Inc. | Cahokia, IL | $8.2M | 178 | 2024 |
| Northwestern Specialists for Women, LLC | Chicago, IL | $8.0M | 59 | 2023 |
| Associated Pathology Consultants - Elmhurst, S.C. | Elmhurst, IL | $8.0M | 4 | 2025 |
| Matrex Exhibits, Inc. | Addison, IL | $7.9M | 72 | 2025 |
| G.K. Enterprises, Inc. | Crete, IL | $7.9M | 325 | 2024 |
| Merchants and Manufacturers Bank Corp | Joliet, IL | $7.9M | 51 | 2024 |
| Thomas White International Ltd | Chicago, IL | $7.9M | 17 | 2023 |
| White Distribution and Supply, Inc. | Rock Island, IL | $7.9M | 297 | 2023 |
| Advanced Endodontics, P.C. | Gurnee, IL | $7.8M | 10 | 2025 |
| Radiology Consultants, Inc. | Chatham, IL | $7.7M | 7 | 2023 |
| Pathology Consultants, S.C. | Inverness, IL | $7.7M | 7 | 2024 |
| Medical Hills Internists, LLC. | Bloomington, IL | $7.7M | 11 | 2023 |
| Drs. Brasky, Feldner and Associates, Ltd. | Orland Park, IL | $7.6M | 8 | 2024 |
| Hartshorne Plunkard Architecture, LLC | Chicago, IL | $7.6M | 45 | 2026 |
| Northwest Ent Associates, S.C. | Chicago, IL | $7.6M | 27 | 2024 |
| Northwestern Dental Center, P.C. | Chicago, IL | $7.6M | 22 | 2025 |
| Valauskas Corder LLC | Chicago, IL | $7.5M | 3 | 2024 |
| Linn-Mathes, Inc. | Chicago, IL | $7.5M | 18 | 2025 |
| Sky Road LLC | Naperville, IL | $7.5M | 32 | 2026 |
| John James Insurance Agency, Inc. | Arlington Heights, IL | $7.4M | 6 | 2024 |
| Scheer Surgical, Sc | Gurnee, IL | $7.4M | 16 | 2025 |
| Crum-Halsted Agency, Inc. | Sycamore, IL | $7.4M | 86 | 2024 |
| Front Barnett Associates LLC | Chicago, IL | $7.3M | 9 | 2024 |
| Scranton Gillette Communications Inc. | Palatine, IL | $7.3M | 39 | 2025 |
| Geneva Family Practice Assoc., S.C | Batavia, IL | $7.2M | 10 | 2023 |
| Cassidy & Mueller, PC | Peoria, IL | $7.0M | 13 | 2024 |
| Lesman Instrument Company, Inc. | Bensenville, IL | $7.0M | 55 | 2024 |
| James J. Benes & Associates Inc. | Wheaton, IL | $7.0M | 13 | 2023 |
| Burklund Distributors Inc | East Peoria, IL | $7.0M | 71 | 2024 |
| Lumeri, LLC | Mount Prospect, IL | $6.9M | 33 | 2024 |
| Anesthesia Associates of Belleville, Ltd. | Belleville, IL | $6.9M | 42 | 2023 |
| Sagence, Inc. | Chicago, IL | $6.8M | 89 | 2023 |
| Jones-Blythe Construction Company | Springfield, IL | $6.8M | 9 | 2023 |
| Gis Solutions, Inc. | Springfield, IL | $6.8M | 18 | 2024 |
| Midwest Pulmonary, Critical Care & Sleep Consultants, LLC | Chicago Ridge, IL | $6.7M | 101 | 2025 |
| Jai D Arya MD Sc | Flossmoor, IL | $6.7M | 4 | 2024 |
| High Ridge Partners, LLC. | Chicago, IL | $6.7M | 15 | 2024 |
| Physicians Laser and Dermatology Institute of Chicago, LLC | Chicago, IL | $6.6M | 10 | 2024 |
| Rosemont Exposition Services, Inc. | Rosemont, IL | $6.6M | 30 | 2023 |
| The Cara Group, Inc. | Oak Brook Terrace, IL | $6.6M | 111 | 2025 |
| Terrence J. Needham, DDS, PC | Oak Lawn, IL | $6.6M | 6 | 2024 |
| Arlington Pediatric Therapy Management Services, Ltd. | Arlington Heights, IL | $6.5M | 68 | 2023 |
| Diesel Radiator Co. | Melrose Park, IL | $6.5M | 124 | 2026 |
| John Burns Construction Company | Orland Park, IL | $6.5M | 101 | 2023 |
| Svi International, Inc. | Dekalb, IL | $6.5M | 35 | 2024 |
| William Levine, Inc. | Chicago, IL | $6.5M | 8 | 2026 |
| Endodontics, Ltd. | Naperville, IL | $6.5M | 4 | 2023 |
| G.A. Blocker Grading Contractor, Inc. | Sandwich, IL | $6.5M | 4 | 2025 |
| Joseph M. Wiedemann & Sons, Inc. | Arlington Heights, IL | $6.4M | 36 | 2025 |
| Northwest Assoc. for Womens Healthcare | Hoffman Estates, IL | $6.4M | 19 | 2024 |
| McVey & Parsky, LLC | Chicago, IL | $6.3M | 34 | 2024 |
| Reliable Building Systems, Inc. | Niles, IL | $6.3M | 5 | 2023 |
| Evive Health, LLC | Chicago, IL | $6.3M | 113 | 2024 |
| Employee Benefit Risk Management Services, Inc. | Oak Brook, IL | $6.3M | 47 | 2025 |
| Tiesenga Surgical Associates, S.C. | Elmwood Park, IL | $6.3M | 30 | 2024 |
| Baumgarten Distributing Co., Inc | Peoria, IL | $6.2M | 43 | 2025 |
| Treetop Products, Inc. | Batavia, IL | $6.2M | 135 | 2023 |
| Elmhurst Dental Group, Ltd | Elmhurst, IL | $6.2M | 221 | 2025 |
| Cfe Media, LLC | Downers Grove, IL | $6.2M | 54 | 2024 |
| Rm Partners Law LLC | Chicago, IL | $6.2M | 16 | 2023 |
| Chartwell Insurance Services, Inc. | Chicago, IL | $6.2M | 12 | 2025 |
| Eligijus P Lelis MD & Assoc, Sc Lelis | New Lenox, IL | $6.2M | 37 | 2023 |
| Endeavor Technologies, Inc | St. Charles, IL | $6.2M | 29 | 2025 |
| Precision Piping, Inc. | Kankakee, IL | $6.2M | 6 | 2026 |
| Metagenics Midwest, Inc. | Bloomington, IL | $6.1M | 3 | 2026 |
| Active Electrical Supply Company | Chicago, IL | $6.1M | 26 | 2024 |
| Yan Razdolsky, D.D.S., B.S.D., Ltd. | Buffalo Grove, IL | $6.1M | 18 | 2025 |
| Muller & Muller, Ltd. | Chicago, IL | $6.1M | 70 | 2025 |
| First Security Trust & Savings Bank | Chicago, IL | $6.1M | 51 | 2025 |
| Drs Srivastava Sc | Rockford, IL | $6.0M | 4 | 2023 |
| Tljw, Inc. | Springfield, IL | $6.0M | 4 | 2023 |
| Lannon, Lannon & Barr, Ltd. | Chicago, IL | $6.0M | 2 | 2023 |
| H.S. Crocker Company, Inc. | Huntley, IL | $6.0M | 226 | 2023 |
| Citizens Rx, LLC | Oak Park, IL | $6.0M | 79 | 2025 |
| Subway Development Corporation of Chicagoland, Inc. | Chicago, IL | $6.0M | 20 | 2024 |
| Clinical Cardiology Consultants,s.c | Melrose Park, IL | $5.9M | 4 | 2023 |
| Nigro, Westfall & Gryska, P.C. | Bloomingdale, IL | $5.9M | 10 | 2024 |
| McHenry Radiologists and Imaging Associates, S.C. | Oak Brook, IL | $5.9M | 10 | 2024 |
| Wells, Wascow & Roessler, L.L.C. | Mundelein, IL | $5.9M | 11 | 2024 |
| Senior Opinions, Inc. | Deerfield, IL | $5.8M | 2 | 2024 |
| Rempe-Sharpe and Associates, Inc. | Geneva, IL | $5.8M | 19 | 2023 |
| Pmjr Investment Corp. | Des Plaines, IL | $5.8M | 21 | 2024 |
| Waller Helms Advisors, LLC | Chicago, IL | $5.8M | 51 | 2025 |