CMS · Medicare Advantage / Part D

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

61,715,863

MoM +0.14% · +84,471

Year-over-Year

+4.5%

vs Sep 2025

Active CMS Contracts

970

Sep 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

+2,943,920 · +36.2%

CMS Report: Enrollment by Contract Comparison

Trend window

	Current MonthSep 2026								Prior MonthAug 2026
Provider	EnrollmentSep 2026	YoY Net Addsvs Sep 2025	YoY % Changevs Sep 2025	YTD % Changevs Jan 2026	Trend24-mo	Overall★ 2026	Ticker	MoM Net Addsvs Aug 2026	EnrollmentAug 2026
#1UnitedHealth Group	13,067,521	-732,719	-5.3%	-1.3%		4.11★	UNH	-3,443	13,070,964
#2Humana	11,066,755	+2,943,920	+36.2%	+6.7%		3.81★	HUM	+14,707	11,052,048
#3Centene Corp.	9,870,314	+873,890	+9.7%	+2.9%		3.38★	CNC	+36,699	9,833,615
#4CVS Health (Aetna)	8,034,436	-241,286	-2.9%	-0.3%		4.20★	CVS	-2,018	8,036,454
#5Health Care Service Corp.	3,673,978	-646,495	-15.0%	+1.6%		3.63★	—	+7,698	3,666,280
#6Elevance Health (Anthem)	2,235,931	-438,999	-16.4%	-0.2%		3.90★	ELV	+918	2,235,013
#7Kaiser Permanente	2,119,083	+125,195	+6.3%	+5.7%		4.41★	—	+2,885	2,116,198
#8Blue Cross Blue Shield (assoc.)	885,150	-8,210	-0.9%	-3.2%		—	—	-3,172	888,322
#9Devoted Health	532,676	+324,026	+155.3%	+20.0%		4.25★	—	+4,170	528,506
#10SCAN Group	461,720	+151,478	+48.8%	+11.4%		4.01★	—	+3,640	458,080
Highmark Health	445,260	-61,716	-12.2%	+3.5%		4.38★	—	-282	445,542
Healthfirst	372,711	+11,718	+3.2%	+1.8%		4.45★	—	-227	372,938
Guidewell (Florida Blue)	308,360	-12,769	-4.0%	-0.4%		4.15★	—	-110	308,470
Alignment Healthcare	298,618	+70,315	+30.8%	+12.4%		4.15★	ALHC	+2,390	296,228
Molina Healthcare	222,604	-41,653	-15.8%	-5.3%		3.22★	MOH	-1,013	223,617
Clover Health	158,437	+50,067	+46.2%	+7.2%		3.51★	CLOV	+542	157,895
Industry total (all contracts)	61,715,863	+2,649,639	+4.5%	+2.5%				+84,471	61,631,392

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 trend window above to shorten the sparkline range. 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.