biggest companies in Columbia, MD

Waters Brothers Contractors, Inc. is a heavy/highway general contractor with a rich history in earthmoving and site preparation, underground utilities construction, concrete construction, base and pave, and construction materials hauling. This trusted company serves both the public and private sectors on municipal, commercial and industrial projects. Much of Waters Brothers Contractors, Inc.'s work is the construction of large building sites but they are also involved in highway and street work for the DOT and municipalities.

AT&T Inc. is a modern media company whose mission is to inspire human progress through the power of communication and entertainment. They bring together premium video content, a large base of direct-to-consumer relationships, high-speed networks optimized for video and advertising technology to lead the next revolution in technology, media and telecommunications. AT&T has recorded 35 consecutive years of quarterly dividend growth and is a Fortune 10 company.

Dell is transforming computing and providing high quality solutions that empower people to do more all over the world.

Opower Inc provides cloud-based software to the utility industry in the US. Energy providers use their platforms to deliver proactive, digital communications for them to manage energy demand and lower service cost. Their software is distributed to 100 utilities worldwide. The company was founded by friends Dan Yates and Alex Laskey in year 2007, and now has a record of 500 employees in its five offices.

General Dynamics Corporation is an American publicly traded, aerospace and defense corporation headquartered in Reston, Virginia.

3365 Nordstrom, Inc. is an American luxury department store chain headquartered in Seattle, Washington and founded by John W.

Improving how businesses and governments interact with citizens, patients, customers and employees.

Serco is a service company that serves Federal, state and local governments, along with the Canadian government, and commercial customers. It specializes in service delivery excellence. They provide clearances and secure systems to perform federal government work, combined with the commercial savvy to drive business results for global corporations. The company helps companies tackle complex problems in areas like healthcare, transportation and defense. Serco was founded in 1988 and is located in Reston, Virginia.

Nielsen Holdings Plc is a British information, data and measurement firm. Nielsen operates in over 100 countries and employs approximately 44,000 people worldwide. Total revenues were $6.2 billion in 2016. The company is listed on the New York Stock Exchange and is currently a component of the S&P 500.

BAE Systems engages in the design, development, manufacture, and support of defense and aerospace systems used in the air, on land, at sea, and in space. The company provides electronic systems and subsystems for military and commercial applications; security and protection products for law enforcement and first responders; and armored combat vehicles, artillery systems, and intelligent munitions, as well as support and service solutions for defense, intelligent, and civilian systems. Its products include combat systems, aeronautics products, information and electronic warfare systems, information and intelligence systems, land and armaments, avionics and navigation systems, reconnaissance and surveillance systems, space electronics, and transformational communications systems. BAE Systems, Inc. was formerly known as BAE Systems North America, Inc. The company was incorporated in 1997 and is headquartered in Rockville, Maryland. It has locations in the United States, the United Kingdom, Sweden, Israel, and South Africa. BAE Systems, Inc. operates as a subsidiary of BAE Systems Holdings, Inc.

AccentCare is a national leader in post-acute home healthcare services, providing comprehensive care, guidance and support for a wide variety of needs, including short-term, complex and chronic conditions.

For more than 100 years, business, government, and military leaders have turned to Booz Allen Hamilton to solve their most complex problems. They trust us to bring together the right minds: those who devote themselves to the challenge at hand, who speak with relentless candor, and who act with courage and character. They expect original solutions where there are no roadmaps. They rely on us because they know that—together—we will find the answers and change the world.

KBR is headquartered in Houston, Texas, also known as the energy capital of the world. They employ approximately 27,000 people worldwide in regions that include the Americas, Africa, Asia-Pacific, Australia, Europe and the Middle East. A technology-driven engineering, procurement and construction company, KBR delivers a wide range of services through these business units: Oil & Gas; Downstream; Technology; Infrastructure, Government and Power (IGP) Americas; IGP Europe, Middle East and Africa; IGP Asia Pacific; IGP North American Government and Logistics; Canada Operations; U.S. Construction; Building Group; Industrial Services; and Ventures.

Marsh LLC provides insurance brokerage and risk management services to businesses, government entities, organizations, and individuals around the world. The company focuses on offering risk consulting, alternative risk financing, and insurance program management services. It offers services in the areas of analytics, Asia client services, Marsh captive solutions, casualty, claims, client and market technologies, cyber risk, financial and professional liability, flood insurance, international placement, multinational client service, political risk, property, surety, terrorism risk, trade credit, and workers' compensation; and private equity, and mergers and acquisitions. The company also provides Marsh Analytics Platform, a solution that enables clients to quantify and manage risk financing through a combination of data, analytics, and technology. It serves industries, such as aviation and aerospace, chemical, construction, education, energy and power, environmental, financial institutions, healthcare, hospitality and gaming, infrastructure, life sciences, manufacturing and automotive, marine, mining, power and utilities, public entity, rail, real estate, sports, and transportation; food and beverage retail and wholesale; and communications, media, and technology. The company was founded in 1871 and is based in New York, New York. Marsh LLC operates as a subsidiary of Marsh & McLennan Companies, Inc.

Laureate Education, Inc., is a leading provider of quality higher education through its global network of degree-granting higher education institutions and state-of-the-art collaborative partnerships with industry leaders.

CACI International Inc is an American multinational professional services and information technology company located in Arlington, Virginia, United States. Their services provide support for national security missions, government intellegence, defense and federal civilian customers. Awarded as a "Fortune World's Most Admired Company." They offer career opportunities for military veterans and industry professionals aid the nation's most critical missions. Their slogan is "Information deployed. Solutions Advanced. Missions Accomplished.

Johns Hopkins Applied Physics Lab University Affiliated Research Centers are independent, nonprofit organizations that conduct essential research, development, and systems engineering to support national security needs. The centers serve strategic national priorities, free from conflicts of interest or competition with commercial industry. Collaboration with leading research universities allows these organizations to provide the U.S. government with access to our nation's most highly skilled scientists, engineers, and analysts to tackle vital national security and scientific challenges.

Henry Schein, Inc. is the world's largest provider of health care products and services to office-based dental, medical and animal health practitioners. The Company also serves dental laboratories, government and institutional health care clinics, and other alternate care sites. A Fortune 500 Company and a member of the NASDAQ 100 Index, Henry Schein employs nearly 16,000 Team Schein Members and serves more than 775,000 customers. The Company offers a comprehensive selection of products and services, including value-added solutions for operating efficient practices and delivering high-quality care. Henry Schein operates through a centralized and automated distribution network, with a selection of more than 96,000 branded products and Henry Schein private-brand products in stock, as well as more than 110,000 additional products available as special-order items. The Company also offers its customers exclusive, innovative technology solutions, including practice management software and e-commerce solutions, as well as a broad range of financial services. Headquartered in Melville, N.Y., Henry Schein has operations or affiliates in 25 countries. The Company's sales reached a record $8.9 billion in 2012, and have grown at a compound annual rate of 17% since Henry Schein became a public company in 1995.

ADT is one of today's most trusted and well-known brands in the security industry and currently serves more than six million customers, making us the largest company of our kind in both the U.S. and Canada. Our broad and pioneering set of products and services-from interactive home and business solutions to home health services-meet a range of customer needs for today's active and increasingly mobile lifestyles.