UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 21, 2016

ANTHEM, INC.

(Exact name of registrant as specified in its charter)

120 Monument Circle

Indianapolis, IN 46204

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (317) 488-6000

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Section 8—Other Events

Item 8.01—Other Events.

On July 21, 2016, Anthem, Inc. (the “Company”) issued a press release in response to the decision by the U.S. Department of Justice (“DOJ”) to file a civil antitrust lawsuit to block the Company’s acquisition of Cigna Corporation (“Cigna”). In the press release, the Company states that it is fully committed to challenging the DOJ’s decision in court, but will remain receptive to any efforts to reach a settlement with the DOJ that will allow the Company to complete the Cigna acquisition. A copy of the press release is furnished as Exhibit 99.1 to this report.

None of the information furnished in Item 8.01 or Exhibit 99.1 hereto shall be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended. Unless expressly set forth by specific reference in such filings, none of the information furnished in this report shall be incorporated by reference in any filing under the Securities Act of 1933, as amended, whether made before or after the date hereof and regardless of any general incorporation language in such filings.

Section 9—Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

The following exhibit is being furnished herewith:

IMPORTANT INFORMATION FOR INVESTORS AND SHAREHOLDERS

NO OFFER OR SOLICITATION

This communication does not constitute an offer to sell or a solicitation of an offer to sell or a solicitation of an offer to buy any securities or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended, and otherwise in accordance with applicable law.

ADDITIONAL INFORMATION AND WHERE TO FIND IT

In connection with the proposed transaction between Anthem, Inc. (“Anthem”) and Cigna Corporation (“Cigna”), Anthem has filed with the U.S. Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4, including Amendment No. 1 thereto, containing a joint proxy statement of Anthem and Cigna that also constitutes a prospectus of Anthem. The registration statement was declared effective by the SEC on October 26, 2015. This communication is not a substitute for the registration statement, definitive joint proxy statement/prospectus or any other document that Anthem and/or Cigna have filed or may file with the SEC in connection with the proposed transaction.

INVESTORS AND SECURITY HOLDERS OF ANTHEM AND CIGNA ARE URGED TO READ THE DEFINITIVE JOINT PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED WITH THE SEC CAREFULLY IN THEIR ENTIRETY AS THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. Investors and security holders may obtain free copies of the registration statement containing the definitive joint proxy statement/prospectus and other documents filed with the SEC by Anthem or Cigna through the web site maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by Anthem are available free of charge on Anthem’s internet website at http://www.antheminc.com or by contacting Anthem’s Investor Relations Department at (317) 488-6390. Copies of the documents filed with the SEC by Cigna are available free of charge on Cigna’s internet website at http://www.cigna.com or by contacting Cigna’s Investor Relations Department at (215) 761-4198.

FORWARD-LOOKING STATEMENTS

This document, and oral statements made with respect to information contained in this communication, contain certain forward-looking information about Anthem, Inc. (“Anthem”), Cigna Corporation (“Cigna”) and the combined businesses of Anthem and Cigna that is intended to be covered by the safe harbor for “forward-looking statements” provided by the Private Securities Litigation Reform Act of 1995. Forward-looking statements are statements that are not generally historical facts. Words such as “expect(s),” “feel(s),” “believe(s),” “will,” “may,” “anticipate(s),” “intend,” “estimate,” “project” and similar expressions (including the negative thereof) are intended to identify forward-looking statements, which generally are not historical in nature. Such statements are subject to certain known and unknown risks and uncertainties, many of which are difficult to predict and generally beyond Anthem’s and Cigna’s control, that could cause actual results and other future events to differ materially from those expressed in, or implied or projected by, the forward-looking information and statements. These risks and uncertainties include: those discussed and identified in Anthem’s and Cigna’s public filings with the U.S. Securities and Exchange Commission (the “SEC”). Important factors that could cause actual results and other future events to differ materially from the forward-looking statements made in this communication are set forth in other reports or documents that Anthem and/or Cigna may file from time to time with the SEC, and include, but are not limited to: (i) the ultimate outcome of the proposed transaction, including the ability to achieve the synergies and value creation contemplated by the proposed transaction, (ii) the ultimate outcome and results of integrating the operations of Anthem and Cigna, (iii) disruption from the merger making it more difficult to maintain businesses and operational relationships, (iv) the risk that unexpected costs will be incurred in connection with the proposed transaction, (v) the timing to consummate the proposed transaction and (vi) the possibility that the proposed transaction does not close, including, but not limited to, due to the failure to satisfy the closing conditions, including the receipt of required regulatory approvals. All forward-looking statements attributable to Anthem, Cigna or any person acting on behalf of Anthem and/or Cigna are expressly qualified in their entirety by this cautionary statement. Readers are cautioned not to place undue reliance on these forward-looking statements that speak only as of the date hereof. Except to the extent otherwise required by federal securities law, neither Anthem nor Cigna undertake any obligation to republish revised forward-looking statements to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events or the receipt of new information. Readers are also urged to carefully review and consider the various disclosures in Anthem’s and Cigna’s SEC reports.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 21, 2016

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