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.

Enrollment: May 2026
State data: May 2026
Penetration: May 2026
Star Ratings: 2026
Generated: 2026-05-12 16:01 UTC
CMS source ↗

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

	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	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. Star Ratings are 2026 Overall ratings, member-weighted across each parent's contracts. Click column headers to sort; type in the filter box to search. 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.