Industry Analysis

Market Share Over Time

Each provider's share of the total Medicare Advantage / Part D universe across the comparison periods. The final column shows the percentage-point change from the oldest column to the most recent — positive means the provider is gaining share, negative means they're losing it.

Enrollment: May 2026
State data: May 2026
Penetration: May 2026
Star Ratings: 2026
Generated: 2026-05-12 15:46 UTC
CMS source ↗

Market Share by Parent Organization

Provider	May 2026 Share	Apr 2026 Share	May 2025 Share	May 2024 Share	May 2021 Share	Share Δvs May 2021
UnitedHealth Group	21.31%	21.40%	23.27%	23.38%	22.83%	-1.51 pp
Humana	17.81%	17.76%	13.83%	14.65%	16.36%	+1.45 pp
Centene Corp.	16.02%	16.00%	15.16%	13.48%	10.24%	+5.78 pp
CVS Health (Aetna)	13.07%	13.09%	14.14%	16.07%	16.65%	-3.58 pp
Health Care Service Corp.	5.95%	5.94%	7.25%	0.88%	0.77%	+5.18 pp
Elevance Health (Anthem)	3.63%	3.64%	4.58%	4.27%	0.00%	+3.63 pp
Kaiser Permanente	3.43%	3.43%	3.37%	3.35%	3.40%	+0.02 pp
Blue Cross Blue Shield (assoc.)	1.46%	1.47%	1.55%	1.43%	0.00%	+1.46 pp
Devoted Health	0.82%	0.80%	0.37%	0.38%	0.07%	+0.74 pp
SCAN Group	0.73%	0.72%	0.52%	0.49%	0.43%	+0.30 pp
Highmark Health	0.73%	0.73%	0.86%	0.78%	0.65%	+0.08 pp
Healthfirst	0.60%	0.60%	0.60%	0.52%	0.41%	+0.19 pp
Guidewell (Florida Blue)	0.50%	0.50%	0.55%	0.67%	0.46%	+0.04 pp
Alignment Healthcare	0.47%	0.47%	0.37%	0.30%	0.16%	+0.31 pp
Molina Healthcare	0.37%	0.37%	0.45%	0.45%	0.25%	+0.12 pp
Clover Health	0.25%	0.25%	0.18%	0.14%	0.13%	+0.13 pp

Share calculated as provider's total contract enrollment divided by the industry's total contract enrollment for the same month. "pp" = percentage points.