| 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 |
| American Hotel Register Company | Vernon Hills, IL | $42M | — | 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 |
| 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 | — | 2023 |
| L&g Law Group LLP | Chicago, IL | $25M | — | 2023 |
| Fuchs & Roselli, LTD | Chicago, IL | $22M | 49 | 2025 |
| Marine Bank | Springfield, IL | $21M | — | 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 |
| 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 | — | 2023 |
| Aurora Radiology Consultants, S.c. | Aurora, IL | $19M | 19 | 2025 |
| Gentry Medical Solutions, INC. | Springfield, IL | $19M | 73 | 2025 |
| Platinum Home Mortgage Corporation | Hoffman Estates, IL | $18M | — | 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 |
| 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 | — | 2023 |
| Elgin Academy | Elgin, IL | $13M | 214 | 2024 |
| Standard Equipment Company | Elmhurst, IL | $13M | 47 | 2024 |
| Reed-union Corporation | Northbrook, IL | $12M | 3 | 2024 |
| Mueller Financial Services INC | Elgin, IL | $12M | 50 | 2025 |
| Knox & Schneider, INC. | Chicago, IL | $12M | 22 | 2024 |
| Ruettiger, Tonelli & Associates, INC. | Shorewood, IL | $12M | 23 | 2023 |
| R.t. Milord Company | Bridgeview, IL | $12M | 25 | 2024 |
| Tall Tree Foods, INC. | Glenview, IL | $11M | 176 | 2025 |
| 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 |
| Hyzon Motors USA, INC. | Bolingbrook, IL | $11M | 221 | 2025 |
| First Centennial Mortgage Corporation | Aurora, IL | $11M | 148 | 2024 |
| Equity Commonwealth Management L | Chicago, IL | $11M | 31 | 2025 |
| Ophthalmology Associates, LTD | Cherry Valley, IL | $11M | 23 | 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 | — | 2023 |
| 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 | — | 2023 |
| Goldman Ismail Tomaselli Brennan & Baum LLP | Chicago, IL | $9.6M | 33 | 2025 |
| Day & Robert, P.C. | Naperville, IL | $9.6M | 4 | 2025 |
| Ctm Advisors, LTD. DBA Ctm Cpas & Business Advisors | Lincolnshire, IL | $9.5M | 54 | 2025 |
| Sanford L. Barr, D.D.S., LTD. | Chicago, IL | $9.5M | 17 | 2025 |
| Elmhurst Auto Group LTD DBA Elmhurst Toyota | Elmhurst, IL | $9.5M | — | 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 |
| 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 |
| 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 |
| 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 | — | 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 | — | 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 |
| 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 |
| 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 |
| 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 |
| 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 | — | 2023 |
| Elmhurst Dental Group, LTD | Elmhurst, IL | $6.2M | 221 | 2025 |
| Cfe Media, LLC | Downers Grove, IL | $6.2M | 54 | 2024 |
| Chartwell Insurance Services, INC. | Chicago, IL | $6.2M | 12 | 2025 |
| Eligijus P Lelis MD & Assoc, Sc Lelis | New Lenox, IL | $6.2M | — | 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 |
| 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 |
| Rossi Contractors, INC. | Northlake, IL | $5.8M | 16 | 2024 |
| Gc Packaging, LLC | Des Plaines, IL | $5.7M | 93 | 2024 |
| Michael Kowalik D.D.S. LTD. | Burbank, IL | $5.7M | 10 | 2026 |
| Thomas R. Mizen, M.D. & Associates, LLC | Chicago, IL | $5.7M | 6 | 2024 |
| John M. Damas, D.D.S., LTD. | Lemont, IL | $5.7M | 2 | 2023 |
| Hoover's Mfg. CO. | Peru, IL | $5.7M | 7 | 2024 |
| Steven F. Soltes, M.D., LTD. | Oak Lawn, IL | $5.7M | 6 | 2024 |
| R.w.s., INC. | Markham, IL | $5.7M | 5 | 2025 |
| Demar, INC. | Lombard, IL | $5.7M | 67 | 2025 |
| Design Toscano, INC. | Barrington, IL | $5.7M | 64 | 2025 |
| Stone Wheel, INC. | Willowbrook, IL | $5.6M | 213 | 2024 |
| Northside Community Bank | Riverwoods, IL | $5.6M | 31 | 2024 |
| International Language Services, INC. | Chicago, IL | $5.6M | 3 | 2025 |
| Curtis Imel, D.D.S., P.C. | Peru, IL | $5.6M | 2 | 2023 |
| Mark W. Anderson, DDS, Ms, P.C. | Danville, IL | $5.6M | 6 | 2025 |
| Shepard Schwartz & Harris LLP | Chicago, IL | $5.6M | 6 | 2025 |
| Camelot Endodontics, LTD. | Rockford, IL | $5.6M | 14 | 2023 |
| Smith Oil Corporation | Rockford, IL | $5.6M | 18 | 2025 |
| Tall Tree Investment Management, LLC | Warrenville, IL | $5.5M | 13 | 2024 |
| The Upchurch Group, INC. | Mattoon, IL | $5.5M | 21 | 2026 |
| Phillip L. Cacioppo, M.D., S.c. | Itasca, IL | $5.5M | 6 | 2024 |
| Hytk, INC. | Warrenville, IL | $5.5M | 2 | 2024 |
| Imagination Publishing, LLC | Chicago, IL | $5.5M | 71 | 2023 |
| Crown Furniture CO,. INC. | Homewood, IL | $5.5M | 2 | 2025 |
| Cranlake Management Company | Highwood, IL | $5.5M | 12 | 2025 |
| Fathauer Grainland, INC | Dalton City, IL | $5.5M | 4 | 2026 |
| Dixon Veterinary Hospital, P.C. | Dixon, IL | $5.5M | 47 | 2024 |
| Central Illinois Pathology, S.c. | Peoria, IL | $5.4M | 22 | 2023 |
| Glueckert Funeral Home, LTD. | Arlington Heights, IL | $5.4M | 11 | 2024 |
| Dupage Valley Anesthesiologists, LTD | Naperville, IL | $5.4M | 32 | 2025 |