| Yellowjacket Oilfield Services, L.l.c. | Construction | $9,486,850 | $8,073,878 | 354 | $109.7M |  Research |
| Imperative Chemical Partners, Inc. | Mining, Quarrying, and Oil and Gas Extraction | $8,693,400 | $8,806,173 | 480 | $29.1M | Research |
| Energy Services Holdings, LLC | Construction | $7,349,975 | $7,451,017 | 351 | $108.8M | Research |
| The Bosworth Company, Ltd | Construction | $5,900,000 | $5,969,830 | 380 | $120.2M | Research |
| Wildcat Oil Tools, LLC | Mining, Quarrying, and Oil and Gas Extraction | $5,190,800 | $5,251,667 | 173 | $10.5M | Research |
| Blackline Energy Services, LLC | Mining, Quarrying, and Oil and Gas Extraction | $5,174,692 | $5,247,988 | 246 | $14.9M | Research |
| Sand Revolution Holdings LLC | Transportation and Warehousing | $5,131,000 | $5,194,567 | 467 | $124.7M | Research |
| Plc Group, LLC | Construction | $5,071,400 | $5,131,552 | 90 | $27.9M | Research |
| Integrity Services, LLC | Mining, Quarrying, and Oil and Gas Extraction | $5,065,129 | $5,145,045 | 300 | $18.2M | Research |
| Big D Equipment Company | Real Estate and Rental and Leasing | $4,944,900 | $5,021,683 | 296 | $133.7M | Research |
| Mulholland Energy Services, LLC | Mining, Quarrying, and Oil and Gas Extraction | $4,811,222 | $4,884,192 | 364 | $22.1M | Research |
| Reliant Holdings Ltd | Manufacturing | $4,556,000 | $4,615,228 | 320 | $317.4M | Research |
| Silvertip Completion Services Operating, LLC | Mining, Quarrying, and Oil and Gas Extraction | $4,372,601 | $4,424,593 | 206 | $12.5M | Research |
| Ranch & Oilfield Construction, LLC | Mining, Quarrying, and Oil and Gas Extraction | $4,245,700 | $4,294,904 | 73 | <$5M | Research |
| Intrepid Directional Drilling Specialists LLP | Mining, Quarrying, and Oil and Gas Extraction | $4,173,300 | $4,221,873 | 119 | $7.2M | Research |
| Encore Pipe & Construction LLC | Construction | $3,916,390 | $3,962,081 | 234 | $72.5M | Research |
| Tom-E-Lee Industries, LLC | Transportation and Warehousing | $3,704,200 | $2,811,951 | 96 | $14.5M | Research |
| Smtih Industries, LLC | Mining, Quarrying, and Oil and Gas Extraction | $3,536,200 | $2,399,381 | 178 | $10.8M | Research |
| New Wave Energy Services Ltd | Mining, Quarrying, and Oil and Gas Extraction | $3,279,000 | $3,447,998 | 188 | $11.4M | Research |
| Charger Aggregate LLC | Mining, Quarrying, and Oil and Gas Extraction | $3,100,000 | $3,140,852 | 136 | $8.3M | Research |
| J & W Services & Equipment Co | Wholesale Trade | $3,002,800 | $3,036,941 | 158 | $48.4M | Research |
| Forza Pipeline Services Inc. | Construction | $2,938,200 | $2,971,204 | 200 | $60.8M | Research |
| Manor Park INC | Health Care and Social Assistance | $2,735,250 | $2,767,009 | 361 | N/A | Research |
| Buckeye, Inc. | Mining, Quarrying, and Oil and Gas Extraction | $2,612,500 | $2,656,161 | 114 | $6.9M | Research |
| Nitrogen Services LLC | Mining, Quarrying, and Oil and Gas Extraction | $2,600,900 | $2,630,116 | 116 | $7.0M | Research |