CMS · Medicare Advantage / Part D

Enrollment by Contract — Top Parent Organizations

Auto-aggregated from the CMS Monthly Enrollment by Contract release. Compare current month, last month, and one year ago with % and absolute net adds, member-weighted Star Ratings, and one-click stock lookups. 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

Trend window

State

Star ≥

	CurrentMay 2026			PriorApr 2026			Year agoMay 2025
Provider	Enrollment	% Changevs Apr 2026	Net Addsvs Apr 2026	Enrollment	% Changevs May 2025	Net Addsvs May 2025	Enrollment	Trend24-mo	Overall★ 2026	Ticker
UnitedHealth Group	13,074,844	-0.2%	-25,351	13,100,195	-3.9%	-535,981	13,636,176		4.11★	$UNH
Humana	10,928,307	+0.5%	+57,078	10,871,229	+34.1%	+2,765,756	8,105,473		3.80★	$HUM
Centene Corp.	9,827,893	+0.3%	+33,297	9,794,596	+10.2%	+908,862	8,885,734		3.39★	$CNC
CVS Health (Aetna)	8,019,902	+0.1%	+5,119	8,014,783	-3.2%	-268,795	8,283,578		4.20★	$CVS
Health Care Service Corp.	3,647,020	+0.3%	+9,460	3,637,560	-14.4%	-613,312	4,250,872		3.63★	—
Elevance Health (Anthem)	2,226,106	-0.0%	-231	2,226,337	-17.0%	-455,686	2,682,023		3.90★	$ELV
Kaiser Permanente	2,102,750	+0.2%	+4,494	2,098,256	+6.1%	+121,410	1,976,846		4.41★	—
Blue Cross Blue Shield (assoc.)	897,803	-0.4%	-3,578	901,381	-0.8%	-6,876	908,257		—	—
Devoted Health	500,919	+2.7%	+12,981	487,938	+126.4%	+272,452	215,486		4.23★	—
SCAN Group	447,939	+1.2%	+5,468	442,471	+45.6%	+138,488	303,983		4.01★	—
Highmark Health	445,249	-0.0%	-76	445,325	-11.4%	-57,462	502,787		4.38★	—
Healthfirst	369,499	+0.2%	+761	368,738	+5.1%	+17,842	350,896		4.45★	—
Guidewell (Florida Blue)	308,020	-0.1%	-176	308,196	-4.0%	-12,876	321,072		4.15★	—
Alignment Healthcare	289,395	+1.5%	+4,243	285,152	+29.8%	+65,435	219,717		4.15★	$ALHC
Molina Healthcare	225,023	-1.5%	-3,446	228,469	-12.6%	-32,957	261,426		3.22★	$MOH
Clover Health	156,390	+0.4%	+594	155,796	+48.6%	+50,975	104,821		3.51★	$CLOV
Industry total (all contracts)	61,345,989	+0.2%	+121,422	61,224,567	+4.5%	+2,628,563	58,596,004

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.