Fastest-Growing Companies in the Fortune 1000 by revenue

Updated: Jun 04, 2014 9:37 PM UTC | Originally published: May 06, 2013

Apollo Global Management<\/h1>\n\n\n\n\nApollo Global Management is a global alternative investment manager headquartered in New York City. It raises, invests and manages funds on behalf of some of the world's most prominent pension and endowment funds as well as other institutional and individual investors.

Apollo Global Management

Apollo Global Management is a global alternative investment manager headquartered in New York City. It raises, invests and manages funds on behalf of some of the world's most prominent pension and endowment funds as well as other institutional and individual investors.

Leucadia National<\/h1>\n\n\n\n\nLeucadia National Corp. is a holding company. In 2012 it began a merger with Jefferies that was finalized in March 2013.

Leucadia National

Leucadia National Corp. is a holding company. In 2012 it began a merger with Jefferies that was finalized in March 2013.

Courtesy: Colfax

Colfax

Colfax Corp., based out of Fulton, Md., is a global industrial manufacturing and engineering company that develops, manufactures, engineers and services fluid handling systems.

Alleghany<\/h1>\n\n\nAlleghany Corp. provides property, casualty reinsurance, insurance and financial services.

Alleghany

Alleghany Corp. provides property, casualty reinsurance, insurance and financial services.

KKR<\/h1>\n\n\nKKR is a global investment firm specializing in private equity.

KKR

KKR is a global investment firm specializing in private equity.

Kristopher R. Konrad <\/h1>\n

Annaly Capital Management

Annaly Capital Management is a real estate investment trust that owns and manages a portfolio of mortgage-backed securities.

Superior Energy Services<\/h1>\n\n\n\n\nSuperior Energy Services, Inc. provides oil field services to oil and gas companies operating worldwide.Courtesy: Superior Energy

Superior Energy Services

Superior Energy Services, Inc. provides oil field services to oil and gas companies operating worldwide.

Energy Transfer Equity<\/h1>\n\n\nEnergy Transfer Equity started as a natural gas pipeline operator in Texas and now also works with NGLs, and crude oil and refined products.Courtesy: Energy Transfer Equity

Energy Transfer Equity

Energy Transfer Equity started as a natural gas pipeline operator in Texas and now also works with NGLs, and crude oil and refined products.

Express Scripts Holding<\/h1>\n\n\nExpress Scripts is a prescription drug benefits manager. It acquired Medco in 2012, which more than doubled sales.\n\nPhoto: Whitney Curtis\/Bloomberg\/Getty

Express Scripts Holding

Express Scripts is a prescription drug benefits manager. It acquired Medco in 2012, which more than doubled sales.

SandRidge Energy<\/h1>\n\n\n\n\nSandRidge Energy is an oil and gas company operating in northern Oklahoma, western Kansas. It also has assets in the Gulf of Mexico.Courtesy: SandRidge

SandRidge Energy

SandRidge Energy is an oil and gas company operating in northern Oklahoma, western Kansas. It also has assets in the Gulf of Mexico.

Nexeo Solutions Holdings<\/h1>\n\n\nNexeo Solutions is a Texas-based company that distributes chemicals, plastics, composites and environmental services.Courtesy: Nexeo

Nexeo Solutions Holdings

Nexeo Solutions is a Texas-based company that distributes chemicals, plastics, composites and environmental services.

Courtesy: Ecolab

Ecolab

Ecolab makes and distributes cleaning and sanitizing products.

Prudential Financial<\/h1>\n\n\n\n\nThe financial services provider's sales jumped to $81 billion in 2012.Courtesy: Prudential Financial

Prudential Financial

The financial services provider's sales jumped to $81 billion in 2012.

Rock-Tenn<\/h1>\n\n\n\n\nRock-Tenn manufactures packaging products, including recycled paperboard, containerboard, bleached paperboard and merchandising displays. Courtesy: RockTenn

Rock-Tenn

Rock-Tenn manufactures packaging products, including recycled paperboard, containerboard, bleached paperboard and merchandising displays.

AGL Resources<\/h1>\n\n\nAGL Resources is a company specializing in natural gas distribution, marketing and energy services.Photo: Carla Gottgens\/Bloomberg\/Getty

AGL Resources

AGL Resources is a company specializing in natural gas distribution, marketing and energy services.

Centene<\/h1>\n\n\nCentene Corp. provides healthcare programs and services to 17 states in the Northeast, South and Pacific Northwest.Courtesy: Centene

Centene

Centene Corp. provides healthcare programs and services to 17 states in the Northeast, South and Pacific Northwest.

United Rentals<\/h1>\n\n\n\n\nUnited Rentals sells and rents commercial construction, HVAC and other heavy equipment.Courtesy: United Rentals

United Rentals

United Rentals sells and rents commercial construction, HVAC and other heavy equipment.

Continental Resources<\/h1>\n\n\n\n\nContinental Resources is a U.S. petroleum liquid producer.Courtesy: Continental Resources

Continental Resources

Continental Resources is a U.S. petroleum liquid producer.

Calumet Specialty Products<\/h1>\n\n\nCalumet Specialty Products is a refiner and processor of specialty hydrocarbon products.\n\nPhoto: Mario Villafuerte\/Bloomberg\/Getty

Calumet Specialty Products

Calumet Specialty Products is a refiner and processor of specialty hydrocarbon products.

Level 3 Communications<\/h1>\n\n\nLevel 3 Communications is an international communications company and a Tier 1 Internet provider based in Broomfield, Colo.Photo: Matthew Staver\/Getty Images

Level 3 Communications

Level 3 Communications is an international communications company and a Tier 1 Internet provider based in Broomfield, Colo.

Green Mountain Coffee Roasters<\/h1>\n\n\nGreen Mountain Coffee Roasters is a coffee brand based in Waterbury, Vt. The company owns Keurig.Photo: Herb Swanson\/Bloomberg via Getty Images

Green Mountain Coffee Roasters

Green Mountain Coffee Roasters is a coffee brand based in Waterbury, Vt. The company owns Keurig.

Photograph by Scott Olson \u2014 Getty Images

Groupon

Groupon is a daily deals website that features a variety of goods and services.

Apple<\/h1>\n\n\n\n\nApple is a technology company that makes iEverything: computers, tablets, and phones.Courtesy: Apple

Apple

Apple is a technology company that makes iEverything: computers, tablets, and phones.

Windstream<\/h1>\n\n\n\n\nWindstream, formerly known as Valor Communications, provides voice, broadband and entertainment services. Courtesy: Windstream

Windstream

Windstream, formerly known as Valor Communications, provides voice, broadband and entertainment services.

Verifone Systems<\/h1>\n\n\n\n\n\n\nVerifone provides technology for electronic payment transactions and value-added services at the point of sale. Courtesy: Verifone

Verifone Systems

Verifone provides technology for electronic payment transactions and value-added services at the point of sale.