Directory Inc.

Alcoa Corporation (a portmanteau of Aluminum Company of America) is an American industrial corporation. It is the world's eighth largest producer of aluminum,[2] with corporate headquarters in Pittsburgh, Pennsylvania.[3] Alcoa conducts operations in 10 countries. Alcoa is a major producer of primary aluminum, fabricated aluminum, and alumina combined, through its active and growing participation in all major aspects of the industry: technology, mining, refining, smelting, fabricating, and recycling.[4] In May 2007 Alcoa Inc. made a US$27 billion hostile takeover bid for Alcan in an attempt to form the world's largest aluminum producer.[5] The bid was withdrawn when Alcan announced a friendly takeover by Rio Tinto in July 2007.[6] On November 1, 2016, Alcoa Inc. split into two new entities: Alcoa Corporation, which is engaged in the mining and manufacture of raw aluminium, and Arconic, which processes aluminum and other metals.[7] Alcoa moved its headquarters back to Pittsburgh effective September 1, 2017.[8] In October 2018, Alcoa announced plans to move from Pittsburgh's North Shore to a more downtown Pittsburgh location.

Alliance Data Systems Corporation is a publicly traded provider of loyalty and marketing services, such as private label credit cards, coalition loyalty programs, and direct marketing, derived from the capture and analysis of transaction-rich data.

Ally Financial is a bank holding company organized in Delaware and headquartered in Detroit, Michigan. The company provides financial services including car finance, online banking via a direct bank, corporate lending, vehicle insurance, mortgage loans, and an electronic trading platform to trade financial assets. Ally is ranked 19th on the list of largest banks in the United States by assets, is the largest car finance company in the U.S. by volume,[2] and serves over 6 million customers.[1] Via its SmartAuction online marketplace for auto auctions, launched in 2000, the company has sold more than 5 million vehicles, including 281,000 vehicles sold in 2018.[1][3] The company was known as GMAC, an acronym for General Motors Acceptance Corporation, until 2010.

Altria Group, Inc. (previously known as Philip Morris Companies, Inc.) is an American corporation and one of the world's largest producers and marketers of tobacco, cigarettes and related products. It operates worldwide and is headquartered in Henrico County, Virginia, just outside the city of Richmond. Altria is the parent company of Philip Morris USA (producer of Marlboro cigarettes), John Middleton, Inc., U.S. Smokeless Tobacco Company, Inc., Philip Morris Capital Corporation, and Chateau Ste. Michelle Wine Estates. Altria also maintains large minority stakes in Belgium-based brewer ABInBev, the Canadian cannabis company Cronos Group, and the e-cigarette maker JUUL Labs. It is a component of the S&P 500 and was a component of the Dow Jones Industrial Average from 1985 to 2008, dropping due to spin-offs of Kraft Foods Inc. in 2007 and Philip Morris International in 2008.

Ameren Corporation is an American power company created December 31, 1997 by the merger of St. Louis, Missouri's Union Electric Company (formerly NYSE: UEP) and the neighboring Central Illinois Public Service Company (CIPSCO Inc. holding, formerly NYSE: CIP) of Springfield, Illinois.[4] It is now a holding company for several power companies and energy companies. The company is based in St. Louis, serving 2.4 million electric, and 900,000 natural gas customers across 64,000 square miles.[5] Ameren is the holding company for the following:[6] Ameren Missouri Ameren Illinois Ameren Transmission Company The Ameren Missouri subsidiary owns Bagnell Dam on the Osage River, which forms the Lake of the Ozarks. Ameren Missouri is responsible for managing water levels on the lake according to federal regulations.

American Electric Power (AEP) is a major investor-owned electric utility in the United States of America, delivering electricity to more than five million customers in 11 states. AEP ranks among the nation's largest generators of electricity, owning nearly 38,000 megawatts of generating capacity in the U.S. AEP also owns the nation's largest electricity transmission system, a nearly 39,000-mile (63,000 km) network that includes 765 kilovolt ultra-high voltage transmission lines, more than all other U.S. transmission systems combined.[4] AEP's transmission system directly or indirectly serves about 10 percent of the electricity demand in the Eastern Interconnection, the interconnected transmission system that covers 38 eastern and central U.S. states and eastern Canada, and approximately 11 percent of the electricity demand in the Electric Reliability Council of Texas, the transmission system that covers much of Texas. AEP's utility units operate as AEP Ohio, AEP Texas, Appalachian Power (in Virginia, West Virginia, and Tennessee), Indiana Michigan Power, Kentucky Power, Public Service Company of Oklahoma, and Southwestern Electric Power Company (in Arkansas, Louisiana and east Texas). AEP's headquarters are in Columbus, Ohio. American Electric Power was the first utility to utilize 345 kV transmission lines which took place in 1953. The company ranked 185th on the 2018 Fortune 500 of the largest United States corporations by revenue.

American Family Insurance, also abbreviated as AmFam, is an American private mutual company that focuses on property, casualty, and auto insurance, and also offers commercial insurance, life, health, and homeowners coverage as well as investment and retirement-planning products. A Fortune 500 company, its revenues were over $9.5 billion in 2017.[3][4] It should not be confused with American Family Home Insurance Company, a subsidiary of Munich Re subsidiary American Modern Insurance Group, Inc., or American Family Life Assurance Company of Columbus.

American Tower Corporation (also referred to as American Tower or ATC) is an American publicly held company, owner and operator of wireless and broadcast communications infrastructure in several countries. American Tower is headquartered in Boston, Massachusetts and has local offices worldwide.[3] The company was formed in 1995 as a unit of American Radio Systems, and was spun off from that company in 1998 when that company merged with CBS Corporation. Following the merger, American Tower began international expansion by establishing operations in Mexico in 1998 and Brazil in 1999. The company is structured as a real estate investment trust and was named to Fortune magazine's Fortune 500 for the first time in 2017. In 2005, American Tower merged with SpectraSite Communications, Inc., expanding its global portfolio to over 22,000 owned communications sites including over 21,000 wireless towers, 400 broadcast towers and 100 in-building DAS (Distributed Antenna System) sites. The merger further established American Tower’s position as one of the largest tower owner and operators in North America. Between 2007 and 2012, American Tower’s international growth continued with operations in India, Peru, Chile, Colombia, South Africa, Ghana and Uganda. In 2013, American Tower acquired its smaller rival Global Tower Partners for 4.8 billion. This acquisition added sites to their U.S. portfolio and added operations in Costa Rica and Panama. Currently American Tower owns and operates over 170,000 sites in 16 countries. Soon after American Tower was founded, the company began purchasing numerous AT&T Long Lines microwave telephone relay towers. Upon acquisition of these sites from the now defunct AT&T Communications, Inc., American Tower began repurposing the towers for use as cell towers, and leasing antenna space to various American cell phone providers and private industries. Then, most of the former AT&T Long Lines sites had their horn-reflector antennas removed, either by helicopter or by crane, to make room for more antennas. Since AT&T's Long Lines Program was decommissioned in the 1980s, and the company no longer had any use for the towers themselves, American Tower now owns most of these tower structures across the entire continental United States. The picture below depicts a former AT&T Long Lines microwave radio relay tower, now repurposed by American Tower Corporation.

AmerisourceBergen Corporation is an American drug wholesale company that was formed by the merger of Bergen Brunswig and AmeriSource in 2001.[2] They provide drug distribution and related services designed to reduce costs and improve patient outcomes, distribute a line of brand name and generic pharmaceuticals, over-the-counter (OTC) health care products and home health care supplies and equipment to a wide variety of health care providers located throughout the United States, including acute care hospitals and health systems, independent and chain retail pharmacies, mail-order facilities, physicians, clinics and other alternate site facilities, as well as skilled nursing and assisted living centers. They also provide pharmaceuticals and pharmacy services to long-term care, workers' compensation and specialty drug patients. AmerisourceBergen is a market leader in pharmaceutical distribution handling about 20% of all of the pharmaceuticals sold and distributed throughout the country and ranked 12th on the Fortune 500 list for 2018 with over $153 billion in annual revenue.[3] In terms of revenue (79.49 billion in 2012) the firm is the largest based in Pennsylvania.

Amphenol Corporation is a major producer of electronic and fiber optic connectors, cable and interconnect systems such as coaxial cables.[3] Amphenol is a portmanteau from the corporation's original name, American Phenolic Corp.[4] Amphenol was founded in Chicago in 1932 by entrepreneur Arthur J. Schmitt, whose first product was a tube socket for radio tubes (valveholder bases).[5] Amphenol expanded significantly during World War II, when the company became the primary manufacturer of connectors used in military hardware, including airplanes and radios. From 1967 to 1982 it was part of Bunker Ramo Corporation. The company sells its products into diverse electronics markets, including military-aerospace, industrial, automotive, information technology, mobile phones, wireless infrastructure, broadband, medical, and pro audio. Operations are located in more than 60 locations around the world. Amphenol's world headquarters is located in Wallingford, Connecticut.[6] The largest division of Amphenol is Amphenol Aerospace (formerly Bendix Corporation) in Sidney, New York. This is the birthplace of the MIL-DTL-38999 cylindrical connector. Amphenol engineers also invented the commonly used BNC connector ("Bayonet Neill-Concelman"). Amphenol Fiber Systems International is a fiber optic company started in 1993 that specializes in the fabrication and manufacturing of fiber optic connectivity products and systems. AFSI provides solutions for communication systems based on fiber optic interconnect technology. AFSI employs over 100 people at its 50,000 square foot facility in the heart of the telecom corridor in Allen, just north of Dallas, Texas.[7] Amphenol Cables on Demand, another division of Amphenol launched in December 2006, specializes in distributing standard cable assemblies via their e-commerce storefront. They sell more than 2500 audio, video, computer, and networking cables. Offices are located in New York, California, Florida, Toronto, and China.