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

October 8, 2013

Date of Report (Date of earliest event reported)

Chimerix, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (919) 806-1074

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligations of the registrant under any of the following provisions:

¨  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

Item 8.01 Other Events.

On October 8, 2013, in the press release attached hereto as Exhibit 99.1 and incorporated herein by reference, we announced the proposed public offering of our common stock. The principal purposes of the offering are to facilitate an orderly distribution of shares and to increase the company's public float. We will not receive any proceeds from the sale of the shares.

Morgan Stanley and Cowen and Company are acting as joint book-running managers for the offering. The offering will be made only by means of a prospectus. When available, copies of the preliminary prospectus relating to the offering may be obtained from: Morgan Stanley & Co., LLC, Attn: Prospectus Department, 180 Varick Street, New York, New York 10014, or by calling toll free 1-866-718-1649 or emailing at prospectus@morganstanley.com; or Cowen and Company, LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, Attn: Prospectus Department, by calling (631) 274-2806, or faxing (631) 254-7140.

The information in this Item 8.01 and the attached Exhibit 99.1 is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section. The information in this Item 8.01 and the attached Exhibit 99.1 shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

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.

INDEX TO EXHIBITS