| National Institutes of Health |
17,299 |
| Lockheed Martin Corporation |
6,967 |
| Marriott International, Inc. |
4,877 |
| National Cancer Institute |
1,484 |
| Coventry Health Care, Inc. |
416 |
| Chevy Chase Bank, F.S.B. |
320 |
| National Institute of Allery and Infectious Diseases |
280 |
| American Capital, Ltd. |
274 |
| Clark Construction Group, LLC |
239 |
| Reznick Group, P.C. |
212 |
| Hanger Orthopedic Group, Inc. |
209 |
| Areva NC Inc |
205 |
| Uniformed Services University of the Health Sciences |
179 |
| USEC Inc. |
166 |
| HMSHost Corporation |
158 |
| CoStar Group, Inc. |
157 |
| American Society of Health-System Pharmacists |
154 |
| Cystic Fibrosis Foundation |
137 |
| Montgomery County's (Maryland) school |
135 |
| United BioSource Corp |
126 |
| US Consumer Product Safety Commission |
126 |
| National Institute of Neurological Disorders and Stroke |
124 |
| Host Hotels |
97 |
| American Gastroenterological Association |
94 |
| Association for Financial Professionals, Inc. |
88 |
| Development Alternatives Inc. |
86 |
| Editorial Projects-Education |
86 |
| Calvert Group, Ltd. |
83 |
| National Capital Area Council, BSA |
77 |
| B.F. Saul company Hotel Division |
70 |
| Automotive Aftermarket Industry Association |
68 |
| Parenteral Drug Association |
68 |
| Aggregate Industries Management Inc. |
68 |
| Suburban Hospital |
68 |
| ProQuest-CSA LLC |
68 |
| Stratos Global Corporation |
64 |
| Meltzer Group |
64 |
| Iridium Communications Inc. |
63 |
| Linowes & Blocher, LLP |
61 |
| American Physiological Society |
61 |
| National Electrical Contractors Association, Inc. (The) |
60 |
| Federation of American Societies for Experimental Biology |
59 |
| Calvert Group |
55 |
| Watkins Meegan Drury |
54 |
| Balducci's, LLC |
51 |
| American Occupational Therapy Association |
50 |
| Clovis Group |
45 |
| Euromotorcars, Inc. |
45 |
| University Research Corp |
44 |
| Sucampo Pharmaceuticals, Inc. |
42 |
| Broadpoint Technologies |
40 |
| Sentech, Inc |
39 |
| RainKing Software |
39 |
| Catapult Technology Ltd. |
38 |
| bigdough.com |
37 |
| National Institutes of Health, Clinical Center |
37 |
| Paley Rothman Goldstein, Rosenberg & Cooper, Eig and Schwartz, Charted |
36 |
| American Association of Blood Banks |
35 |
| GlobalGiving |
35 |
| Arxan Technologies, Inc. |
35 |
| Walker & Dunlop |
35 |
| First Assist |
35 |
| American Podiatric Medical Association |
34 |
| Hospitality Partners |
34 |
| Robert Charles Lesser |
34 |
| Gelman, Rosenberg |
34 |
| Epok, Inc. |
32 |
| Terrapin Systems |
32 |
| Eagle Bancorp, Inc. |
32 |
| Brivo Systems, LLC |
32 |
| ProFund Advisors LLC |
31 |
| Lerch, Early & Brewer, Chartered |
31 |
| American Association for Geriatric Psychiatry |
30 |
| Chevy Chase Trust Company |
29 |
| CodeRyte Inc |
29 |
| GreenPark Financial Walker & Dunlop |
29 |
| Micromet, Inc |
29 |
| WealthEngine.com |
29 |
| Snyder Cohn |
28 |
| Bond Beebe |
28 |
| Technical Resources International Inc |
28 |
| Stone Ridge School of the Sacred Heart |
27 |
| First Potomac Realty Trust |
27 |
| Saul Centers, Inc. |
27 |
| National Council on Radiation Protection and Measurements |
26 |
| EagleBank |
26 |
| I A Q Publications Inc |
25 |
| Johnson Lambert |
24 |
| Radius Global Travel Co |
24 |
| The Ezra Company |
24 |
| American Society for Investigative Pathology |
23 |
| Martek Global Services, Inc |
22 |
| Imagination Stage Inc |
22 |
| ASB Capital Management |
21 |
| Society Of American Foresters |
21 |
| American Fisheries Society |
21 |
| American Society for Cell Biology ASCB |
21 |
| Carroll Publishing Co |
21 |
| 1800 Pack Rat |
21 |
| Tiger Tigress Production |
21 |
| E-site Marketing |
20 |
| American Medical Informatics Association |
20 |
| National Association of School Psychologists |
20 |
| Miller & Long Co., Inc. |
20 |
| Network For Good |
20 |
| Landon School Corporation |
20 |
| Burness Communications, Inc. |
20 |
| Futron Corporation |
19 |
| E J Krause & Assoc |
19 |
| Red Coats Inc |
19 |
| First Washington Realty Trust, Inc. |
19 |
| National Foundation for Cancer Research |
18 |
| Conquest Systems, Inc. |
18 |
| TDEC |
18 |
| Shugoll Research |
18 |
| The ASCII Group, Inc. |
18 |
| Realty Management Svc |
18 |
| Chindex International, Inc. |
17 |
| Presidential Bank, FSB |
17 |
| Foundation For The National Institutes Of Health |
17 |
| MarketBridge |
17 |
| Biophysical Society Conference |
17 |
| Honest Tea |
17 |
| American Society for Nutrition |
17 |
| The CDM Group Inc. |
17 |
| The Woods Academy |
17 |
| GetWell Network |
16 |
| MobiApps |
16 |
| Rubino & McGeehin, Chartered |
16 |
| Fidelis Security Systems Inc. |
16 |
| S.S. Papadopulos & Associates |
16 |
| American Society for Pharmacology and Experimental Therapeutics |
16 |
| National Energy & Gas Transmission, Inc. |
15 |
| Cardiocore Lab, Inc. |
15 |
| Hamilton Altman Canale & Dillon LLC |
15 |
| NOVA Research Company |
15 |
| Richard S. Carson & Associates, Inc. |
15 |
| Bregman Berbert Schwartz & Gilday LLC |
15 |
| Fixation Marketing |
15 |
| American Society of Human Genetics |
15 |
| American Association of Immunologists |
15 |
| Gtm Architects |
15 |
| Inside Mortgage Finance |
15 |
| Winchester Homes |
15 |
| Kaulkin Ginsberg Company |
15 |
| RLJ Development |
15 |
| Warren.com |
15 |
| Datawatch Systems Inc |
15 |
| American Society for Biochemistry and Molecular Biology (ASBMB) |
15 |
| e-centives, Inc. |
14 |
| Victory Housing |
14 |
| Tenenbaum & Saas P.C. |
14 |
| PRISM Group, Inc. |
14 |
| Grossberg Company LLP |
14 |
| Computech, Inc. |
14 |
| Development Finance International, Inc |
14 |
| Potomac Hudson Engineering |
14 |
| Adhesive Sealant Council |
14 |
| Novak Biddle Venture Partners |
14 |
| America's Most Wanted |
14 |
| Maple Life Financial |
14 |
| RESOLVE Inc. |
14 |
| Counter Technology, Inc. |
14 |
| Marine Mammal Commission |
14 |
| Eagle Bank |
14 |
| The Artery Group, LLC |
13 |
| Progressive Technology Federal Systems, Inc. |
13 |
| Earth Share |
13 |
| BETAH Associates Inc |
13 |
| Councilor Buchanan & Mitchell, P.C. |
13 |
| Global Pharmaceutical Sourcing |
13 |
| Ocm Direct |
13 |
| Bethesda Urban Partnership, Inc. |
13 |
| Rlj Select Investments, Llc |
13 |
| Contract Consultants & Co |
12 |
| FLAVORx, Inc. |
12 |
| EZGSA |
12 |
| Administrative Services, Inc. |
12 |
| Rapid Advance |
12 |
| Spherix, Inc. |
11 |
| Mortgagestar |
11 |
| WCore |
11 |
| Transactis |
11 |
| Patrinely Group |
11 |
| DiamondRock Hospitality |
11 |
| Admiral Security Services |
11 |
| Infrastructure Management Group Inc |
11 |
| Empower IT, Inc. |
11 |
| Genetics Society of America |
11 |
| American College of Medical Genetics |
11 |
| UniDev, LLC |
11 |
| Hatcher Group |
11 |
| ASPRS - The American Society for Photogrammetry & Remote Sensing |
10 |
| Youth for Understanding USA |
10 |
| Enten |
10 |
| Saint Corporation |
10 |
| Apex Home Loans, Inc |
10 |
| Mistral Group |
10 |
| Selzer Gurvitch Rabin & Obecny Chartered |
10 |
| Streetsense |
10 |
