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Enrollment by Contract — Top Parent Organizations

Auto-aggregated from the CMS Monthly Enrollment by Contract release. Current-month enrollment with year-over-year net adds, year-over-year %, and year-to-date % alongside member-weighted Star Ratings, 24-month trend, and one-click stock lookups. Prior-month enrollment is listed as a reference column on the right. Tables sort and export to CSV.
Industry Enrollment
61,345,989
MoM +0.2%
Year-over-Year
+4.7%
vs May 2025
Active CMS Contracts
970
May 2026
Top YoY Grower (Tracked)iRanked by absolute net adds year over year across the 16 tracked parent organizations. Both the absolute change (+ members) and % change vs the year-ago snapshot are shown. Providers must have at least 50,000 members in the prior year to qualify.
Humana
+2,822,834 · +34.8%
CMS Report: Enrollment by Contract Comparison
Current MonthMay 2026Prior MonthApr 2026
ProviderEnrollmentMay 2026YoY Net Addsvs May 2025YoY % Changevs May 2025YTD % Changevs Jan 2026Trend24-moOverall★ 2026TickerEnrollmentApr 2026
#1UnitedHealth Group13,074,844-561,332-4.1%-1.3%4.11★UNH13,100,195
#2Humana10,928,307+2,822,834+34.8%+5.4%3.80★HUM10,871,229
#3Centene Corp.9,827,893+942,159+10.6%+2.5%3.39★CNC9,794,596
#4CVS Health (Aetna)8,019,902-263,676-3.2%-0.5%4.20★CVS8,014,783
#5Health Care Service Corp.3,647,020-603,852-14.2%+0.9%3.63★—3,637,560
#6Elevance Health (Anthem)2,226,106-455,917-17.0%-0.7%3.90★ELV2,226,337
#7Kaiser Permanente2,102,750+125,904+6.4%+4.9%4.41★—2,098,256
#8Blue Cross Blue Shield (assoc.)897,803-10,454-1.2%-1.9%——901,381
#9Devoted Health500,919+285,433+132.5%+12.8%4.23★—487,938
#10SCAN Group447,939+143,956+47.4%+8.1%4.01★—442,471
Highmark Health445,249-57,538-11.4%+3.5%4.38★—445,325
Healthfirst369,499+18,603+5.3%+0.9%4.45★—368,738
Guidewell (Florida Blue)308,020-13,052-4.1%-0.5%4.15★—308,196
Alignment Healthcare289,395+69,678+31.7%+9.0%4.15★ALHC285,152
Molina Healthcare225,023-36,403-13.9%-4.3%3.22★MOH228,469
Clover Health156,390+51,569+49.2%+5.8%3.51★CLOV155,796
Industry total (all contracts)61,345,989+2,749,985+4.7%+1.8%61,224,567
How to read this: Each % Change and Net Adds column compares the enrollment column to its left against the next column to the right. The Trend column is a 24-month sparkline of the parent's total enrollment—green if today is above where they started, red if below. Star Ratings are 2026 Overall ratings, member-weighted across each parent's contracts. Use the filter strip above to narrow by state operating footprint or minimum star rating, or to shorten the sparkline window. Values aggregate all CMS contracts whose Parent Organization field maps to the listed company. Contracts with enrollment ≤ 10 are masked by CMS (HIPAA) and contribute zero.