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GLYPH<c4988>  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 

GLYPH<H18554>  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 

DELAWARE (State or other jurisdiction of incorporation or organization) 900 Cottage Grove Road, Bloomfield, Connecticut (Address of principal executive offices) 

For the transition period from  to 

## UNITED STATES SECURITIES AND EXCHANGE COMMISSION 

For the fiscal year ended December 31, 2012 

Commission file number 1-8323 

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## CIGNA CORPORATION 

(Exact name of registrant as specified in its charter) 

(860) 226-6000 Registrant’s telephone number, including area code (860) 226-6741 Registrant’s facsimile number, including area code 

Washington, D.C. 20549 

## FORM 10-K 

OR 

06-1059331 (I.R.S. Employer Identification No.) 06002 (Zip Code) 

## SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT: 

Title of each class Common Stock, Par Value $0.25 

Name of each exchange on which registered New York Stock Exchange, Inc. 

## SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT: 

## NONE 

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The aggregate market value of the voting stock held by non-affiliates of the registrant as of June 29, 2012 was approximately $12.7 billion. As of January 31, 2013, 285,954,499 shares of the registrant’s Common Stock were outstanding. 

Part III of this Form 10-K incorporates by reference information from the registrant’s proxy statement to be dated on or about March 15, 2013. 

