The 25 Most Important Private Companies

See our methodology and credits



The companies were selected based on a combination of factors: their prodigious revenues or assets, their social currency, their deep connection to our daily lives, and (particularly for the newer and smaller companies), their disruptive impact.

For more on the 25 Most Important Private Companies, see "Companies Find a New Allure in Going Private."


By Erika Fry, Leigh Gallagher, Vivian Giang, Erin Griffith, Robert Hackett, Mathew Ingram, John Kell, Beth Kowitt, Adam Lashinsky, Michal Lev-Ram, Sy Mukherjee, Brian O’Keefe, and Christopher Tkaczyk

Fortune has long celebrated the achievements of massive publicly-held corporations in lists such as the long-running Fortune 500. Today, as even super-hot startups forgo IPOs (at least for now), and some public behemoths turn private, the time has come to recognize the hugely significant contributions of those corporations that choose not to sell their stock to the public.

See our methodology and credits


Sort by:
  1. Rank
Clear Filters

Filter by

Clear Filters

Clear Filters

View The Full List

Kaiser Permanente

It provides 50 million rides per month in the U.S. It operates in more than 400 cities around the world. It employs nearly 7,000 people, not including its million-plus global network of contractor-drivers. Its lobbyists fight nonstop regulatory battles in municipalities from Austin to Seoul, deploying a combination of sweet-talking, threats, and grass-roots campaigning. It […]
Photograph by Brooks Kraft—Corbis via Getty Images

Kaiser Permanente may just be an antidote to our perpetually ailing health care system. The 71-year-old nonprofit—it’s a health plan, a hospital system, and a physicians’ group all in one—provides high-­quality and relatively affordable care to some 10 million members in eight states. As both the payer and the provider, Kaiser (2015 revenue: $61 billion) aims to keep costs low and patients healthy: Salaried doctors focus on prevention and positive outcomes; records are digitized; “advice nurses,” reachable by phone, avert pricey needless emergency room visits; and the company conducted 22 million email consultations in 2015.

Company Info

CEO Bernard Tyson
HQ location Oakland

Sign In


Thank you for your interest in licensing Fortune content. Please find information on various licensing contacts below and choose the one that best suits your needs:

  • 1. To license Fortune articles, excerpts, or headlines for republication in various media (including books, eBooks, film, web, newsletters, newspapers, magazines and others), please email
  • 2. To license a Fortune cover, order reprint or e-print copies of an article or cover, or license an accolade, please contact PARS International at
  • 3. To license text only photocopies of Fortunearticles as print or digital handouts in academic settings, or in academic coursepacks, please contact the Copyright Clearance Center at