UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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): April 13, 2015

ZIMMER HOLDINGS, INC.

(Exact name of registrant as specified in its charter)

345 East Main Street

Warsaw, Indiana 46580

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (574) 267-6131

Not applicable

(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:

On April 13, 2015, Zimmer Holdings, Inc. (the “Company”) notified LVB Acquisition, Inc. (“LVB”) of the Company’s election to extend the Outside Date (as such term is defined in the Agreement and Plan of Merger (the “Merger Agreement”), dated as of April 24, 2014, by and among the Company, Owl Merger Sub, Inc. and LVB). As a result of such notice and pursuant to the terms of the Merger Agreement, the Outside Date has been extended by an additional 90 calendar days from April 24, 2015 to July 23, 2015.

Also on April 13, 2015, the Company issued a press release regarding the extension of the Outside Date described above, which is attached as Exhibit 99.1 to this report.

Additional Information and Where to Find It

Zimmer filed with the U.S. Securities and Exchange Commission (the “SEC”), and the SEC declared effective on September 29, 2014, a registration statement on Form S-4 that includes a consent solicitation statement of LVB that also constitutes a prospectus of Zimmer. INVESTORS AND SECURITYHOLDERS OF LVB ARE URGED TO READ THE CONSENT SOLICITATION STATEMENT/PROSPECTUS AND OTHER FILINGS MADE WITH THE SEC IN CONNECTION WITH THE MERGER CAREFULLY AND IN THEIR ENTIRETY, BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE MERGER. The registration statement and consent solicitation statement/prospectus and other documents filed by Zimmer with the SEC may be obtained free of charge at the SEC’s website at www.sec.gov or from Zimmer at www.zimmer.com. You may also read and copy any reports, statements and other information filed by Zimmer, LVB and Biomet with the SEC at the SEC public reference room at 100 F Street N.E., Room 1580, Washington, D.C. 20549. Please call the SEC at (800) 732-0330 or visit the SEC’s website for further information on its public reference room. Certain executive officers and directors of LVB have interests in the proposed transaction that may differ from the interests of stockholders generally, including benefits conferred under retention, severance and change in control arrangements and continuation of director and officer insurance and indemnification.

This communication shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to appropriate registration or qualification under the securities laws of 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.

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.

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