The insurer’s stock sank to its lowest level in more than a decade after the federal government lowered the rating for one of its most popular plans.

Humana said the total members enrolled in its highly rated Medicare Advantage plans for people aged 65 years and above have reduced for 2025, sending the insurer's shares down about 12% in premarket trading.

Humana’s stock was headed for another sharp selloff on Tuesday, toward a more than four-year low, after the government cut its rating on one of the health insurer’s large Medicare Advantage plans because it missed some performance measures.