Connecticut officials have received official assurances that CVS Health will keep Aetna in Hartford for at least the next decade.
The pledge is included in a commitment letter CVS delivered Wednesday to the Connecticut Insurance Department.
CVS had said in January that it had no plans to move Aetna, reversing last year's announcement by the insurance giant that it would move its headquarters to another state. Hartford has been Aetna's home since 1853.
CVS announced last December that it was buying Aetna.
Wednesday's commitment letter also promises employee levels at Aetna will remain at approximately 5,291 for at least the next four years. CVS also will continue to honor civic contributions of the Aetna Foundation and a promised $50 million payment to the city of Hartford over five years.