Harvard Business Review recently released its annual ranking of the 100 "Best-Performing CEOs in the World"—and the list includes nine CEOs in the health care industry.

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List details

To create the ranking, HBR took into account financial returns over the CEOs' tenure as well as the company's rating on environmental, social, and governance (ESG) issues. HBR excludes CEOs with less than two years tenure.

For this year's list, HBR made ESG account for a greater share of each CEO's score than in years past, increasing its weight from 20% to 30%. According to HBR, the change in weighting led Amazon CEO Jeff Bezos, who's made the list every year since 2014, to fall off the list in this edition, given Amazon's relatively low ESG scores.

Still, since the publication uses numbers that span the CEOs' careers, the list changes minimally year-to-year, according to HBR. Overall, 65 of the 100 CEOs on this year's list also made last year's list.

HBR noted that women are underrepresented on the list, making up just four entries on the 100-person list, up from three entries last year.

Meet the health care CEOs that made the cut in 2019

Nine health care CEOs made the list this year:

12. *Michael Mussallem, Edwards Lifesciences (United States);

33. *Hisashi Ietsugu, Sysmex (Japan);

47. *Michael Mahoney, Boston Scientific (United States);

51. Olivier Filliol, Mettler Toledo (United States);

75. *Marc Casper, Thermo Fisher Scientific (United States);

77. Pascal Soriot, AstraZeneca (United Kingdom);

83. Paul Perreault, CSL (Australia);

90. Colin Goldschmidt, Sonic Healthcare (Australia); and

93. Leonard Schleifer, Regeneron Pharmaceuticals (United States).

* Denotes CEOs who made last year's list (Harvard Business Review, November-December 2019).