Filed by Humana Inc.

Pursuant to Rule 425 under the Securities Act of 1933

And deemed filed pursuant to Rule 14a-6(b) under the Securities Exchange Act of 1934

Subject Company: Humana Inc.

Commission File No.: 001-05975

Date: September 11, 2015

The following letter was sent to Humana’s stockholders on September 11, 2015:

 

500 West Main Street

Louisville, KY 40202

PLEASE VOTE YOUR PROXY TODAY

September 11, 2015

Dear Stockholder:

According to our latest records, we have not received your voting instructions for the Special Meeting of Stockholders of Humana Inc. to be held on Monday, October 19, 2015. Your vote is extremely important, no matter how many shares you hold.

For the reasons set forth in the proxy statement/prospectus, dated August 28, 2015, Humana’s board of directors unanimously determined that the merger agreement, the merger and the other transactions contemplated by the merger agreement are advisable and fair to and in the best interests of Humana stockholders and unanimously recommends that Humana stockholders vote (i) FOR the adoption of the merger agreement, (ii) FOR the adjournment from time to time of the Humana special meeting if necessary to solicit additional proxies if there are not sufficient votes at the time of the special meeting, or any adjournment or postponement thereof, to adopt the merger agreement, and (iii) FOR the non-binding advisory proposal to approve compensation that will or may be paid or provided by Humana to its named executive officers in connection with the merger. Please vote via the internet at www.proxyvote.com as soon as possible or alternatively, please sign, date, and return the enclosed proxy card.

Adoption of the merger agreement requires the affirmative vote of holders of at least three-fourths of the outstanding shares of Humana common stock entitled to vote thereon. Every vote counts, so please vote today.

If you need assistance voting your shares, please call D.F. King toll-free at (800) 676-7437 or collect at (212) 269-5550. On behalf of your Board of Directors, thank you for your cooperation and continued support.

 

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Important Information For Investors And Shareholders

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. In connection with the proposed transaction between Aetna Inc. (“Aetna”) and Humana Inc. (“Humana”), Aetna has filed with the Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4, including Amendment No. 1 thereto, containing a joint proxy statement of Aetna and Humana that also constitutes a prospectus of Aetna. The registration statement was declared effective by the SEC on August 28, 2015, and Aetna and Humana commenced mailing the definitive joint proxy statement/prospectus to shareholders of Aetna and stockholders of Humana on or about September 1, 2015. INVESTORS AND SECURITY HOLDERS OF AETNA AND HUMANA ARE URGED TO READ THE DEFINITIVE JOINT PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED OR THAT WILL BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION. Investors and security holders may obtain free copies of the registration statement and the definitive joint proxy statement/prospectus and other documents filed with the SEC by Aetna or Humana through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by Aetna are available free of charge on Aetna’s internet website at http://www.Aetna.com or by contacting Aetna’s Investor Relations Department at 860-273-2402. Copies of the documents filed with the SEC by Humana are available free of charge on Humana’s internet website at http://www.Humana.com or by contacting Humana’s Investor Relations Department at 502-580-3622.

Aetna, Humana, their respective directors and certain of their respective executive officers may be considered participants in the solicitation of proxies in connection with the proposed transaction. Information about the directors and executive officers of Humana is set forth in its Annual Report on Form 10-K for the year ended December 31, 2014, which was filed with the SEC on February 18, 2015, its proxy statement for its 2015 annual meeting of stockholders, which was filed with the SEC on March 6, 2015, and its Current Report on Form 8-K, which was filed with the SEC on April 17, 2015. Information about the directors and executive officers of Aetna is set forth in its Annual Report on Form 10-K for the year ended December 31, 2014 (“Aetna’s Annual Report”), which was filed with the SEC on February 27, 2015, its proxy statement for its 2015 annual meeting of shareholders, which was filed with the SEC on April 3, 2015 and its Current Reports on Form 8-K, which were filed with the SEC on May 19, 2015, May 26, 2015 and July 2, 2015. Other information regarding the participants in the proxy solicitations and a description of their direct and indirect interests, by security holdings or otherwise, are contained in the definitive joint proxy statement/prospectus of Aetna and Humana filed with the SEC and other relevant materials to be filed with the SEC when they become available.