Pepsi CEO Indra Nooyi is stepping down this year, winnowing further the already small number of women running Fortune 500 companies. Of the 339 CEOs that have held the top job at a Fortune 500 company for at least two years, only 17 were women, about 5 percent.

Following is a list of those who remain:

Ventas Inc.

Debra, A. Cafaro

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General Motors Co.

Mary T. Barra

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General Dynamics Corp.

Phebe N. Nivakovic

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Duke Energy Corp.

Lynn J. Good

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Lockheed Martin Corp.

Marilyn A. Hewson

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IBM Corp.

Virginia M. Rometty

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Hewlett Packard Enterprise Co.

Margaret C. Whitman

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Synchrony Financial

Margaret M. Keane

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Mylan

Heather Bresch

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Sempra Energy

Debra L. Reed

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Ross Stores Inc.

Barbara Rentler

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Advanced Micro Devices Inc.

Lisa T. Su

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KeyCorp

Beth E. Mooney

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Ulta Beauty Inc.

Mary N. Dillon

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Alliant Energy Corp.

Patricia L. Kampling

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American Water Works Co.

Susan N. Story.