Fortune on Tuesday released its 2020 list of the "Best Companies to Work For," and 18 health care companies made the list.

Cheat sheets: How Fortune—and 3 other major publications—choose their 'best places to work'

About the list

Since 1998, Fortune and Great Place to Work have partnered to develop the annual rankings.

In 2018, researchers made significant revisions in the list's methodology to account for changes in the way employers conduct business and employees work. Previously, the rankings focused on trust, pride, and camaraderie. Now, the rankings are based on five key metrics:

• Maximizing human potential;
• Trust;
• Values;
• Innovation; and
• Leadership effectiveness.

The first two factors account for 85% of the grade, while the others make up the remaining. The list also looks at financial growth, but that does not contribute to a company's overall score.

Hilton was named as the No. 1 overall company to work for on this year's list.

The health care companies on this year's list

Texas Health Resources, an Advisory Board member, was the highest-ranked health system, at No. 15.

The other hospitals and health systems that ranked among the 100 companies are:

1. Southern Ohio Medical Center* (Portsmouth, Ohio)
2. BayCare Health System* (Clearwater, Florida)
3. Scripps Health* (San Diego)
4. Baptist Health South Florida* (Coral Gables, Florida)
5. Atlantic Health System (Morristown, New Jersey)
6. Northwell Health* (New Hyde Park, New York)
7. Kettering Health Network* (Miamisburg, Ohio)

* denotes Advisory Board member

Other health care companies that made the list include:

1. Stryker* (Kalamazoo, Michigan)
2. Plante Moran* (Southfield, Michigan)
3. CoverMyMeds (Columbus, Ohio)
4. Regeneron Pharmaceuticals* (Tarrytown, New York)
5. Genentech* (San Francisco)
6. CHG Healthcare* (Midvale, Utah)
7. Novo Nordisk* (Plainsboro, New Jersey)
8. W. L. Gore & Associates* (Newark, Delaware)
9. AbbVie* (North Chicago, Illinois)
10. Encompass Health Home Health & Hospice* (Dallas)

* denotes Advisory Board member

(Fortune/Great Place to Work, "100 Best Companies to Work For," accessed 2/18; Fortune, "100 Best Companies to Work For," accessed 2/18; Great Place to release, 2/18).