CEO Company 2017 Fortune 500 ranking Mary Barra General Motors 8 Ginni Rometty IBM 32 Indra Nooyi PepsiCo 44 Marillyn Hewson Lockheed Martin 56 Meg Whitman Hewlett Packard Enterprise 59 6 Safra A. Catz Oracle Corporation 81 7 Phebe Novakovic General Dynamics 90 8 Irene Rosenfeld Mondelēz International 109 9 Tricia Griffith Progressive Corporation 120 10 Lynn Good Duke Energy 121 11 Shira Goodman Staples Inc . 140 12 Geisha Williams Pacific Gas and Electric Company 157 13 Margaret M. Keane Synchrony Financial 185 14 Deanna M. Mulligan The Guardian Life Insurance Company of America 218 15 Barbara Rentler Ross Stores 219 16 Debra Crew Reynolds American 223 17 Anna Manning Reinsurance Group of America 246 18 Vicki Hollub Occidental Petroleum 278 19 Debra L. Reed Sempra Energy 280 20 Kathryn V. Marinello Hertz Global Holdings 296 21 Kimberly S. Bowers CST Brands 306 22 Mary Laschinger Veritiv Corporation 331 23 Denise Morrison Campbell Soup 339 24 Michele Buck The Hershey Company 369 25 Patti Poppe CMS Energy 419 26 Kathleen Mazzarella Graybar 420 27 Sheri McCoy Avon Products 444 28 Ilene S. Gordon Ingredion 456 29 Margo Georgiadis Mattel 474 30 Beth E. Mooney KeyBank 479 31 Jacqueline Hinman CH2M Hill 494 32 Marissa Mayer Yahoo ! 498

Question: how many ceos of fortune 500 companies are female
Answer: 32