Here are the top 20 stated by the Washington Post. To gather the kind of information you require I suggest a good list broker with the criteria Annual Revenue and Geography (Maryland). I will list a broker in the related links below.
Constellation Energy Group Inc.
Black & Decker Corp.
McCormick & Co.
Legg Mason Inc.
T. Rowe Price Group Inc.
Laureate Education Inc.
Sinclair Broadcast Group Inc.
Williams Scotsman International Inc.
FTI Consulting Inc.
Tessco Technologies Inc.
Jos. A. Bank Clothiers Inc.
Educate Inc.
Municipal Mortgage & Equity LLC
Under Armour Inc.
SafeNet Inc.
Town and Country Trust
Omega Healthcare Investors Inc.
I.C. Isaacs & Co.
Medifast Inc.
Adams Express Co.
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