Health-Insurance Q3 Data Snapshot: Market Cap and Overall Membership

Having spent a fair amount of time scratching through the financial statements of the industry's largest health-insurance companies, I figured it couldn't hurt to put together a few quick snapshots of how UnitedHealth Group, WellPoint and other giants are faring on a fundamental basis.

First up is a simple ranking of insurers by market capitalization -- roughly the total value of each company. Just to give a sense of how dramatically these companies' prospects have declined over the past year, I've also thrown in the year-over-year change in share prices at these companies, which should serve as a rough proxy for the decline in overall worth of the sector. (Market cap and share-price comparisons taken as of Oct. 31.)

Largest managed-care companies by market capitalization:

Company	Market Cap	%Change
UnitedHealth Group	$28.3 billion	-52%
WellPoint	$19.5 billion	-50%
Aetna	$11.5 billion	-54%
Humana	$4.9 billion	-59%
Cigna	$4.2 billion	-67%
Coventry	$1.9 billion	-78%

Next: Largest health insurers by membership

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