Reuters reported this month that Cigna was seeking a buyer for its Medicare Advantage business. Medicare makes up a meager portion of Cigna’s business. The insurer has about 600,000 Medicare Advantage enrollees this year, which amounts to 2% of the market, according to federal data compiled by KFF. Humana’s 5.5 million members and 18% share are the most behind UnitedHealth Group subsidiary UnitedHealthcare’s 8.9 million and 29%.