Medicare Advantage Market Share Enrollment By Carrier

Abstract

This file reports 2025 Medicare Advantage enrollment by parent organization. Each row lists the parent group, covered lives (MA only), market_share_pct, and cumulative_share_pct in rank order, along with source_url/source_title/source_date and last_verified fields indicating whether figures come from KFF’s July 2025 national update or CMS’s August 2025 Monthly Enrollment by Contract.  

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