Illinois Top Companies List by Market Cap as of August 2026

Illinois Top Companies List by Market Cap as on August 2026. Biggest Illinois Companies List by Market Cap in August 2026. Illinois Largest Companies in August 2026.

Illinois Top Companies by Market Cap in 2026
Illinois Top Companies by Market Cap in 2026, Illinois Largest Companies in 2026, Biggest Illinois Companies by Market Cap.

  1. Aon plc

    World Rank (Aug-2026)
    341
    Market Cap (Aug-2026)
    75.481 Billion USD
    World Rank (Jan-05-2024)
    293
    Market Cap (Jan-05-2024)
    58.241 Billion USD
    World Rank (Jul-30-2023)
    250
    Market Cap (Jul-30-2023)
    65.322 Billion USD
    World Rank (Dec-25-2022)
    230
    Market Cap (Dec-25-2022)
    62.178 Billion USD
    World Rank (Jan-07-2022)
    292
    Market Cap (Jan-07-2022)
    62.31 Billion USD
    Annual Revenue in USD
    17,181 Million USD
    Annual Operating Income in USD
    4,344 Million USD
    Annual Net Income in USD
    3,695 Million USD
    Annual Results for Period Ending
    Dec-2025 ending year
    Headquarters Country
    USA
    CEO
    Gregory C. Case
    Stock Category
    S&P 500
    Yahoo @ NYSE
    Company Profile

    AON provides Professional Services related to Insurance, Reinsurance, Commercial Risk Solutions, Investment Solutions. Headquarters is in Illinois, USA. 

    As on 2022, AON has 50,000 employees.

    AON annual revenue generated for period ending Dec-2022 was 12,479 million USD.

    AON annual net income generated for period ending Dec-2022 was 2,589 million USD.

    AON annual revenue generated for period ending Dec-2021 was 12,193 million USD.

    Company Website
    AON PLC
    Wikipedia
    Wikipedia

  2. Mckinsey & Company

    World Rank (Aug-2026)
    342
    World Rank (Jan-05-2024)
    342
    World Rank (Jul-30-2023)
    342
    World Rank (Dec-25-2022)
    342
    Headquarters Country
    USA
    Company Profile

    McKinsey & Company is a global management consultancy company with headquarters in USA.

    Revenue of the company is 16 billion USD in 2023.

     

     

    Wikipedia
    Wikipedia

  3. Allstate Corporation

    World Rank (Aug-2026)
    398
    Market Cap (Aug-2026)
    66.100 Billion USD
    World Rank (Jan-05-2024)
    462
    Market Cap (Jan-05-2024)
    38.861 Billion USD
    World Rank (Jul-30-2023)
    636
    Market Cap (Jul-30-2023)
    29.560 Billion USD
    World Rank (Dec-25-2022)
    457
    Market Cap (Dec-25-2022)
    36.167 Billion USD
    World Rank (Jan-07-2022)
    573
    Market Cap (Jan-07-2022)
    36.11 Billion USD
    Annual Revenue in USD
    67,685 Million USD
    Annual Net Income in USD
    10,282 Million USD
    Annual Results for Period Ending
    For year ending December-2025
    Headquarters Country
    USA
    CEO
    Thomas J. Wilson
    Stock Category
    S&P 500
    Yahoo @ NYSE
    Company Profile

    ALLSTATE CORPORATION is Property and Casualty Insurance and Financial services company with headquarters is in Illinois, USA.

    Company Website
    ALLSTATE CORPORATION (THE)
    Wikipedia
    Wikipedia

  4. Arthur J. Gallagher

    World Rank (Aug-2026)
    408
    Market Cap (Aug-2026)
    64.395 Billion USD
    World Rank (Jan-05-2024)
    356
    Market Cap (Jan-05-2024)
    48.774 Billion USD
    World Rank (Jul-30-2023)
    384
    Market Cap (Jul-30-2023)
    46.324 Billion USD
    World Rank (Dec-25-2022)
    412
    Market Cap (Dec-25-2022)
    39.724 Billion USD
    World Rank (Jan-07-2022)
    607
    Market Cap (Jan-07-2022)
    34.28 Billion USD
    Annual Revenue in USD
    13,942 Million USD
    Annual Operating Income in USD
    2,556 Million USD
    Annual Net Income in USD
    1,494 Million USD
    Annual Results for Period Ending
    Dec-2025 ending year
    Headquarters Country
    USA
    CEO
    J. Patrick Gallagher Jr
    Stock Category
    S&P 500
    Yahoo @ NYSE
    Company Profile

    Insurance Brokerage and Risk Management company with headquarters is in USA.

    Company Website
    AJG
    Wikipedia
    Wikipedia

  5. W.W. Grainger

    World Rank (Aug-2026)
    418
    Market Cap (Aug-2026)
    62.446 Billion USD
    World Rank (Jan-05-2024)
    446
    Market Cap (Jan-05-2024)
    40.501 Billion USD
    World Rank (Jul-30-2023)
    494
    Market Cap (Jul-30-2023)
    36.691 Billion USD
    World Rank (Dec-25-2022)
    597
    Market Cap (Dec-25-2022)
    28.554 Billion USD
    World Rank (Jan-07-2022)
    809
    Market Cap (Jan-07-2022)
    26.05 Billion USD
    Annual Revenue in USD
    17,942 Million USD
    Annual Operating Income in USD
    2,495 Million USD
    Annual Net Income in USD
    1,706 Million USD
    Annual Results for Period Ending
    For year ending December-2025
    Headquarters Country
    USA
    CEO
    Donald G. Macpherson
    Stock Category
    S&P 500
    Yahoo @ NYSE
    Company Profile

    Company offers products related to business to business sales needed for home and business purposes. It sells products through e-Commerce website and branches.

    Facts About Company

    W.W. GRAINGER annual revenue generated for period ending Dec-2022 was 15,228 million USD.

    W.W. GRAINGER annual net income generated for period ending Dec-2022 was 1,537 million USD.

    As on 2022, W.W. GRAINGER has 26,000 employees.

    As on 2021, W.W. GRAINGER has 305 (United States) 54 (Canada). For year ending Dec-2021 W.W. GRAINGER Annual Revenue was 13,022 Million USD and Annual Net Income was 1,043 Million USD.

    Company Website
    W.W. GRAINGER INC
    Wikipedia
    Wikipedia

  6. Exelon Corporation

    World Rank (Aug-2026)
    547
    Market Cap (Aug-2026)
    47.339 Billion USD
    World Rank (Jan-05-2024)
    506
    Market Cap (Jan-05-2024)
    36.015 Billion USD
    World Rank (Jul-30-2023)
    438
    Market Cap (Jul-30-2023)
    41.474 Billion USD
    World Rank (Dec-25-2022)
    378
    Market Cap (Dec-25-2022)
    42.771 Billion USD
    World Rank (Jan-07-2022)
    334
    Market Cap (Jan-07-2022)
    55.41 Billion USD
    Annual Revenue in USD
    24,258 Million USD
    Annual Operating Income in USD
    5,148 Million USD
    Annual Net Income in USD
    2,768 Million USD
    Annual Results for Period Ending
    For year ending December-2025
    Headquarters Country
    USA
    CEO
    Christopher M. Crane
    Stock Category
    S&P 500
    Nasdaq 100
    Yahoo @ Nasdaq
    Company Profile

    Exelon Corporation is Energy and Power Generation company with headquarters is in USA. They have nuclear power plants in USA to generate nuclear energy.Exelon is the nation’s largest utility company, serving more than 10 million customers.

    EXELON CORPORATION have six fully regulated transmission and distribution utilities, They are:

    Company Website
    EXELON CORPORATION
    Wikipedia
    Wikipedia

  7. Ventas

    World Rank (Aug-2026)
    554
    Market Cap (Aug-2026)
    46.945 Billion USD
    World Rank (Jan-05-2024)
    919
    Market Cap (Jan-05-2024)
    19.978 Billion USD
    World Rank (Jul-30-2023)
    958
    Market Cap (Jul-30-2023)
    19.255 Billion USD
    World Rank (Dec-25-2022)
    913
    Market Cap (Dec-25-2022)
    18.183 Billion USD
    World Rank (Jan-07-2022)
    974
    Market Cap (Jan-07-2022)
    21.40 Billion USD
    Annual Revenue in USD
    5,834 Million USD
    Annual Net Income in USD
    262 Million USD
    Annual Results for Period Ending
    For year ending December-2025
    Headquarters Country
    USA
    CEO
    Debra Cafaro
    Stock Category
    S&P 500
    Yahoo @ NYSE
    Company Profile

    Real Estate Investment, Construction and Property Development company with headquarters is in USA.

    As on 2021, VENTAS has 434 employees.

    VENTAS annual revenue generated for period ending Dec-2022 was 4,129 million USD.

    VENTAS annual net loss generated for period ending Dec-2022 was -47 (Loss) million USD.

    Company Website
    VENTAS INC
    Wikipedia
    Wikipedia

  8. United Airlines Holdings

    World Rank (Aug-2026)
    648
    Market Cap (Aug-2026)
    40.682 Billion USD
    World Rank (Jan-05-2024)
    1,307
    Market Cap (Jan-05-2024)
    13.275 Billion USD
    World Rank (Jul-30-2023)
    1,025
    Market Cap (Jul-30-2023)
    17.767 Billion USD
    World Rank (Dec-25-2022)
    1,270
    Market Cap (Dec-25-2022)
    12.551 Billion USD
    World Rank (Jan-07-2022)
    1,318
    Market Cap (Jan-07-2022)
    15.32 Billion USD
    Annual Revenue in USD
    59,070 Million USD
    Annual Operating Income in USD
    4,713 Million USD
    Annual Net Income in USD
    3,353 Million USD
    Annual Results for Period Ending
    For year ending December-2025
    Headquarters Country
    USA
    CEO
    Scott Kirby
    Stock Category
    S&P 500
    Yahoo @ Nasdaq
    Company Profile

    United Airlines is airlines and transportation company with headquarters is in Illinois, USA.

    Together, United and United Express operate approximately 4,900 flights a day to 362 airports across six continents.

    In 2019, United and United Express operated more than 1.7 million flights carrying more than 162 million customers.

    United operates 791 mainline aircrafts and the airline's United Express carriers operate 581 regional aircrafts.

    United Airlines total number of employees in 2022 was 92,795.

    Company Website
    UNITED AIRLINES HOLDINGS
    Wikipedia
    Wikipedia

  9. Archer-Daniels-Midland Company (ADM)

    World Rank (Aug-2026)
    680
    Market Cap (Aug-2026)
    38.774 Billion USD
    World Rank (Jan-05-2024)
    460
    Market Cap (Jan-05-2024)
    39.006 Billion USD
    World Rank (Jul-30-2023)
    375
    Market Cap (Jul-30-2023)
    47.051 Billion USD
    World Rank (Dec-25-2022)
    285
    Market Cap (Dec-25-2022)
    51.978 Billion USD
    World Rank (Jan-07-2022)
    522
    Market Cap (Jan-07-2022)
    39.06 Billion USD
    Annual Revenue in USD
    24,956 Million USD
    Annual Net Income in USD
    1,078 Million USD
    Annual Results for Period Ending
    For year ending December-2025
    Headquarters Country
    USA
    CEO
    Juan Ricardo Luciano
    Stock Category
    S&P 500
    Yahoo @ NYSE
    Company Profile

    Archer Daniels Midland (ADM) is a food processing company with headquarters is in Illinois, USA.

    As on 2022, Archer Daniels Midland (ADM) has 38,332 employees.

    Archer Daniels Midland (ADM) annual revenue generated for period ending Dec-2022 was 101,848 million USD.

    Archer Daniels Midland (ADM) annual net income generated for period ending Dec-2022 was 4,340 million USD.

    Company Website
    ARCHER-DANIELS-MIDLAND COMPANY
    Wikipedia
    Wikipedia

  10. Northern Trust Corporation

    World Rank (Aug-2026)
    751
    Market Cap (Aug-2026)
    35.020 Billion USD
    World Rank (Jan-05-2024)
    1,051
    Market Cap (Jan-05-2024)
    17.093 Billion USD
    World Rank (Jul-30-2023)
    1,106
    Market Cap (Jul-30-2023)
    16.573 Billion USD
    World Rank (Dec-25-2022)
    896
    Market Cap (Dec-25-2022)
    18.347 Billion USD
    World Rank (Jan-07-2022)
    776
    Market Cap (Jan-07-2022)
    26.93 Billion USD
    Annual Revenue in USD
    5,018 Million USD
    Annual Net Income in USD
    1,737 Million USD
    Annual Results for Period Ending
    For year ending December-2025
    Headquarters Country
    USA
    CEO
    Michael G. O'Grady
    Stock Category
    S&P 500
    Yahoo @ Nasdaq
    Company Profile

    Financial Services company with headquarters is in Illinois, USA providing asset management and investment management services.

    As on 2022, NORTHERN TRUST CORPORATION has 25,000 employees.

    NORTHERN TRUST CORPORATION annual revenue generated for period ending Dec-2022 was 6,761 million USD.

    NORTHERN TRUST CORPORATION annual net income generated for period ending Dec-2022 was 1,282 million USD.

    Company Website
    NORTHERN TRUST CORPORATION
    Wikipedia
    Wikipedia

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