| Brad Mcmillin, Inc. | Retail Trade | $2,268,000 | $2,179,737 | 230 | $40.1M |  Research |
| Techguard Security LLC | Professional, Scientific, and Technical Services | $1,790,541 | $1,811,880 | 89 | $18.4M | Research |
| Cvp Holdings, LLC | Retail Trade | $1,380,798 | $1,389,121 | 110 | $27.7M | Research |
| Cgx, INC | Management of Companies and Enterprises | $1,284,133 | $1,296,474 | 98 | $16.1M | Research |
| St Clair Nissan Inc. | Retail Trade | $1,241,160 | $1,248,661 | 67 | $16.9M | Research |
| Seventeen Motors INC | Retail Trade | $1,143,200 | $1,151,552 | 89 | $22.4M | Research |
| O'fallon Automotive, LLC | Retail Trade | $1,017,980 | $1,025,705 | 74 | $18.6M | Research |
| Schmitt Chevrolet, Inc. | Retail Trade | $853,700 | $815,629 | 61 | $15.4M | Research |
| Marathon Administrative Company Inc. | Finance and Insurance | $850,045 | $861,783 | 70 | $30.8M | Research |
| Marathon Administrative Company Inc. | Finance and Insurance | $823,765 | $829,407 | 49 | $21.6M | Research |
| Holtgrave Distributing, INC | Transportation and Warehousing | $788,104 | $792,763 | 54 | $8.2M | Research |
| Holtgrave Distributing INC | Transportation and Warehousing | $780,026 | $784,078 | 43 | $6.5M | Research |
| Associated Physicians Group, Ltd | Health Care and Social Assistance | $658,477 | $662,318 | 83 | $26.1M | Research |
| Associated Physicians Group | Health Care and Social Assistance | $658,477 | $661,001 | 67 | $18.1M | Research |
| Midwest Emergency Department Services, Inc. | Administrative and Support and Waste Management | $630,637 | $635,319 | 38 | $7.2M | Research |
| Allyson Group Inc. | Accommodation and Food Services | $621,110 | $628,650 | 93 | $29.1M | Research |
| Colonnade Senior Development, LLC | Health Care and Social Assistance | $616,300 | $620,628 | 126 | $21.4M | Research |
| Secure Data Technologies, Inc. | Professional, Scientific, and Technical Services | $611,310 | $615,569 | 36 | $7.4M | Research |
| Bel-O Cooling & Heating INC | Construction | $527,842 | $531,906 | 22 | $7.0M | Research |
| Spengler Plumbing Co. Inc. | Construction | $487,095 | $0 | 41 | $13.0M | Research |
| Caring First LLC | Health Care and Social Assistance | $471,419 | $475,009 | 40 | $6.8M | Research |
| Caring First Inc. | Health Care and Social Assistance | $471,400 | $474,797 | 67 | $11.4M | Research |
| St Clair Volkswagen Inc. | Retail Trade | $461,152 | $463,939 | 23 | $5.8M | Research |
| St Clare Roman Catholic Church | Other Services (except Public Administration) | $460,917 | $463,354 | 92 | N/A | Research |
| Allyson Group, Inc. | Accommodation and Food Services | $443,000 | $447,898 | 93 | $29.1M | Research |