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These are the only women CEOs left among S&P 500 companies

Indra Nooyi, CEO of PepsiCo.
Adam Jeffery | CNBC

With Indra Nooyi stepping down from the helm at PepsiCo, that leaves only two dozen female CEOs among the companies today.

Nooyi in particular, having served 12 years as CEO at Pepsi, was viewed as a role model for other women in business. She led the world's second-largest food and beverage company through tumultuous times in the industry, setting the tone for a new behemoth in snacking to emerge. Now, President Ramon Laguarta will be taking her place later this year.

Other top women CEOs in the consumer and retail industries today include Michele Buck at Hershey, Mary Dillon at Ulta and Michelle Gass at Kohl's. A handful of women also hold the chief executive title in the health care, automotive and industrials sectors. One upcoming change to the list, Kathy Warden is set to become the CEO of Northrop Gruman, effective Jan. 1 of next year.

Though women earn more degrees than men, on average, and make up nearly half the labor force in the U.S., women are less represented in management positions the higher up they go, according to Catalyst, a nonprofit that promotes women in the workplace. Even with corporate board seats, the "overwhelming majority" of new directorships continue to go to men, Catalyst said.

Below is a list of the 24 women still serving as chief executive officers among the S&P 500 companies today, listed in alphabetical order by last name:

Mary Barra

General Motors Chief Executive Officer Mary Barra
Getty Images

Company: General Motors
CEO since: Jan. 2014
Company's market capitalization: $53 billion

Gail Boudreaux

Gail Boudreaux 
Getty Images | Taylor Hill/FilmMagic

Company: Anthem
CEO since: Nov. 2017
Company's market capitalization: $66 billion

Heather Bresch

Heather Bresch, CEO of Mylan.
Adam Jeffery | CNBC

Company: Mylan
CEO since: Jan. 2012
Company's market capitalization: $19.5 billion

Michele Buck

Michele Buck
Source: Business Wire

Company: Hershey
CEO since: March 2017
Company's market capitalization: $27 billion

Debra Cafaro

Debra Cafaro, CEO, Ventas
Scott Mlyn | CNBC

Company: Ventas
CEO since: March 1999
Company's market capitalization: $20.6 billion

Safra Catz

Safra Catz, co-chief executive officer of Oracle Corp.
David Paul Morris | Bloomberg | Getty Images

Company: Oracle
CEO since: Sept. 2014
Company's market capitalization: $193.2 billion

Mary Dillon

Mary Dillon, CEO, ULTA Beauty
Slaven Vlasic | Getty Images

Company: Ulta Beauty
CEO since: July 2013
Company's market capitalization: $14.1 billion

Virginia Drosos

Gina Drosos the Le Vian 2019 Red Carpet Revue on June 3, 2018 in Las Vegas, Nevada. 
David Crotty | Patrick McMullan | Getty Images

Company: Signet Jewelers
CEO since: August 2017
Company's market capitalization: $3.5 billion

Adena Friedman

Adena Friedman
Devan Burris | CNBC

Company: Nasdaq
CEO since: Jan. 2017
Company's market capitalization: $15.3 billion

Michelle Gass

Michelle Gass
Chris Ratcliffe | Bloomberg | Getty Images

Company: Kohl's
CEO since: May 2018
Company's market capitalization: $12.1 billion

Lynn Good

Company: Duke Energy
CEO since: July 2013
Company's market capitalization: $57.4 billion

Tricia Griffith

Tricia Griffith, CEO of The Progressive Group
Source: The Progressive Group

Company: Progressive
CEO since: July 2016
Company's market capitalization: $35.7 billion

Marillyn Hewson

Marillyn Hewson, the Chairman, President and Chief Executive Officer of Lockheed Martin.
Carl Court | AFP | Getty Images

Company: Lockheed Martin
CEO since: Jan. 2013
Company's market capitalization: $90.2 billion

Vicki Hollub

Vicki Hollub, president and chief executive officer of Occidental Petroleum Corp., speaks during the 2017 CERAWeek by IHS Markit conference in Houston, Texas.
F. Carter Smith | Bloomberg | Getty Images

Company: Occidental Petroleum
CEO since: April 2016
Company's market capitalization: $63 billion

Patricia Kampling

Patricia Kampling, CEO of Alliant Energy Corp. 
Source: Alliant Energy Corp. 

Company: Alliant Energy
CEO since: April 2012
Company's market capitalization: $10 billion

Margaret Keane

Company: Synchrony Financial
CEO since: Feb. 2014
Company's market capitalization: $22.4 billion

Beth Mooney

Beth Mooney, Chairman and CEO of KeyCorp .
Adam Jeffery | CNBC

Company: KeyCorp
CEO since: May 2011
Company's market capitalization: $22.6 billion

Phebe Novakovic

Phebe Novakovic, chairman and chief executive of General Dynamics Corp.
Stephanie Green | Bloomberg | Getty Images

Company: General Dynamics
CEO since: Jan. 2013
Company's market capitalization: $57.2 billion

Patricia Poppe

Patti Poppe, CEO of CMS Energy
Source: YouTube

Company: CMS Energy
CEO since: July 2016
Company's market capitalization: $13.7 billion

Barbara Rentler

Photo unavailable

Company: Ross Stores
CEO since: June 2014
Company's market capitalization: $33.6 billion

Ginny Rometty

Virginia Rometty
Jodi Gralnick | CNBC

Company: IBM
CEO since: Jan. 2012
Company's market capitalization: $134 billion

Susan Story

Susan Story, CEO, American Water Works Company
Lucas Jackson | Reuters

Company: American Water Works
CEO since: May 2014
Company's market capitalization: $16.2 billion

Lisa Su

Lisa T. Su, CEO of Advance Micro Devices
Adam Jeffery | CNBC

Company: Advanced Micro Devices
CEO since: Oct. 2014
Company's market capitalization: $18.6 billion

Geisha Williams

PG&E Corp CEO and President Geisha Williams speaks onstage at the Fortune Most Powerful Women Summit - Day 2 on October 10, 2017 in Washington, DC. 
Paul Morigi | Getty Images Entertainment | Getty Images

Company: PG&E
CEO since: March 2017
Company's market capitalization: $22.9 billion