The definitive list of women CEOs in the Fortune 500. Last updated on May 13, 2016.
1. Mary Barra

Company: General Motors (GM)
Fortune 500 Rank: 6
2. Meg Whitman

Company: HP (HP)
Fortune 500 Rank: 19
3. Virginia M. Rometty

Company: IBM (IBM)
Fortune 500 Rank: 24
4. Indra K. Nooyi

Company: Pepsico (PEP)
Fortune 500 Rank: 44
5. Marillyn A. Hewson

Company: Lockheed Martin (LMT)
Fortune 500 Rank: 64
6. Safra Catz

Company: Oracle (ORCL)
Fortune 500 Rank: 81
7. Irene B. Rosenfeld

Company: Mondelez International (MDLZ)
Fortune 500 Rank: 91
8. Phebe N. Novakovic

Company: General Dynamics (GD)
Fortune 500 Rank: 100
9. Lynn Good

Company: Duke Energy (DUK)
Fortune 500 Rank: 116
10. Ursula M. Burns

Company: Xerox (XRX)
Fortune 500 Rank: 143
11. Deanna M. Mulligan

Company: Guardian Life Insurance of America
Fortune 500 Rank: 254
12. Barbara Rentler

Company: Ross Stores (ROST)
Fortune 500 Rank: 269
13. Debra L. Reed

Company: Sempra Energy (SRE)
Fortune 500 Rank: 270
14. Kimberly Lubel

Company: CST Brands
Fortune 500 Rank: 277
15. Sherilyn McCoy

Company: Avon (AVP)
Fortune 500 Rank: 322
16. Susan Cameron

Company: Reynolds American (RAI)
Fortune 500 Rank: 337
17. Denise M. Morrison

Company: Campbell Soup (CPB)
Fortune 500 Rank: 342
18. Kathleen M. Mazzarella

Company: Graybar Electric
Fortune 500 Rank: 445
19. Ilene S. Gordon

Ilene Gordon
Under Gordon, who became CEO in 2009, the 107-year-old ingredients maker has become a highflier: This year Ingredion was one of the oldest companies to land on Fortune's Fastest-Growing Companies list. Its profit climbed a whopping 81% on average the past three years.Company: Ingredion (INGR)
Fortune 500 Rank: 462
20. Lisa Su

Company: Advanced Micro Devices
Fortune 500 Rank: 480
21. Jacqueline Hinman

Company: CH2M Hill
Fortune 500 Rank: 480