|  | Top Private Companies | Rank | Company | Revenue | Employees | Industry | | 1 | Mars Inc. | 16.80B | 31,000 | Manufacturing | | 2 | Geico Corp. | 7.78B | 21,000 | Financial services | | 3 | Allegis Group Inc. | 2.75B | 4,317 | Consulting/professional services | | 4 | Booz Allen Hamilton Inc. | 2.50B | 14,433 | Consulting/professional services | | 5 | Clark Enterprises Inc. | 2.49B | 4,200 | Real estate | | 6 | MedStar Health | 2.25B | 22,000 | Health care | | 7 | Goodwill Industries International Inc. | 2.21B | 82,370 | Retail | | 8 | Discovery Communications Inc. | 1.99B | 5,000 | Media | | 9 | Inova Health System | 1.29B | 13,000 | Health care | | 10 | Ritz Camera Centers Inc. | 1.20B | - | Retail | | 11 | B.F. Saul Real Estate Investment Trust | 1.04B | - | Real estate | | 12 | Rosenthal Automotive | 1.01B | 1,500 | Retail | | 13 | Long & Foster Cos. Inc. | 810M | 1,516 | Real estate | | 14 | Feld Entertainment Inc. | 800M | 1,700 | Media | | 15 | Acterna Inc. | 680.3M | 1,700 | Consulting/professional services | |  | | | | | |
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