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

61,832,650

MoM +0.19% · +116,787

Year-over-Year

+4.5%

vs Oct 2025

Active CMS Contracts

970

Oct 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

+2,950,642 · +36.2%

CMS Report: Enrollment by Contract Comparison

Trend window

	Current MonthOct 2026								Prior MonthSep 2026
Provider	EnrollmentOct 2026	YoY Net Addsvs Oct 2025	YoY % Changevs Oct 2025	YTD % Changevs Jan 2026	Trend24-mo	Overall★ 2026	Ticker	MoM Net Addsvs Sep 2026	EnrollmentSep 2026
#1UnitedHealth Group	13,070,663	-755,997	-5.5%	-1.3%		4.11★	UNH	+3,142	13,067,521
#2Humana	11,092,547	+2,950,642	+36.2%	+7.0%		3.82★	HUM	+25,792	11,066,755
#3Centene Corp.	9,903,679	+870,560	+9.6%	+3.3%		3.38★	CNC	+33,365	9,870,314
#4CVS Health (Aetna)	8,037,822	-253,149	-3.1%	-0.3%		4.20★	CVS	+3,386	8,034,436
#5Health Care Service Corp.	3,683,780	-653,154	-15.1%	+1.9%		3.63★	—	+9,802	3,673,978
#6Elevance Health (Anthem)	2,237,145	-435,163	-16.3%	-0.2%		3.90★	ELV	+1,214	2,235,931
#7Kaiser Permanente	2,123,483	+125,285	+6.3%	+5.9%		4.41★	—	+4,400	2,119,083
#8Blue Cross Blue Shield (assoc.)	882,610	-7,779	-0.9%	-3.5%		—	—	-2,540	885,150
#9Devoted Health	541,337	+332,890	+159.7%	+21.9%		4.25★	—	+8,661	532,676
#10SCAN Group	465,608	+154,087	+49.5%	+12.4%		4.01★	—	+3,888	461,720
Highmark Health	445,419	-62,666	-12.3%	+3.5%		4.38★	—	+159	445,260
Healthfirst	374,633	+11,954	+3.3%	+2.3%		4.46★	—	+1,922	372,711
Guidewell (Florida Blue)	309,013	-11,472	-3.6%	-0.2%		4.15★	—	+653	308,360
Alignment Healthcare	301,157	+71,212	+31.0%	+13.4%		4.15★	ALHC	+2,539	298,618
Molina Healthcare	221,887	-42,459	-16.1%	-5.6%		3.23★	MOH	-717	222,604
Clover Health	158,983	+49,484	+45.2%	+7.5%		3.51★	CLOV	+546	158,437
Industry total (all contracts)	61,832,650	+2,649,433	+4.5%	+2.7%				+116,787	61,715,863

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.