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 23, 2010

Equinix, Inc.

(Exact Name of Registrant as Specified in its Charter)

301 Velocity Way, 5th Floor

Foster City, California 94404

(650) 513-7000

(Addresses of principal executive offices)

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 23, 2010, Equinix, Inc. (“Equinix”) received notification from the United States Department of Justice (the “DOJ”) that the DOJ has closed its investigation with respect to the proposed acquisition of Switch & Data Facilities Company, Inc. (“Switch and Data”) by Equinix (the “Merger”) and also received notification from the Federal Trade Commission that the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 has been terminated. Equinix and Switch and Data expect the Merger to close on April 30, 2010, subject to the satisfaction or waiver of the other closing conditions set forth in the merger agreement.

As previously announced, Switch and Data stockholders may revoke their elections at any time prior to 5:00 p.m. Eastern time on the date that is two business days preceding the closing date of the Merger by delivering to the exchange agent a written notice of revocation. Shares of Switch and Data common stock as to which an election has been revoked after January 29, 2010, the election deadline, will be deemed non-electing shares, and no new election as to such shares may be made.

Important Information for Investors and Stockholders

In connection with the proposed transaction involving Equinix and Switch and Data, Equinix has filed with the SEC a registration statement on Form S-4 containing a proxy statement/prospectus. The proxy statement/prospectus was first mailed to stockholders of Switch and Data on or about December 23, 2009. SWITCH AND DATA STOCKHOLDERS ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED WITH THE SEC CAREFULLY IN THEIR ENTIRETY BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION.

Switch and Data stockholders may obtain free copies of the registration statement and the proxy statement/prospectus and other documents filed with the SEC by Equinix and Switch and Data through the website maintained by the SEC at www.sec.gov. In addition, Switch and Data stockholders may obtain free copies of the registration statement and the proxy statement/prospectus and other documents filed with the SEC from Equinix by directing a request to Equinix, Inc., 301 Velocity Way, Fifth Floor, Foster City, CA 94404, Attention: Investor Relations (telephone: 888-222-1162) or going to Equinix’s corporate website at www.equinix.com, or from Switch and Data by directing a request to Switch & Data Facilities Company, Inc., 1715 Westshore Boulevard, Suite 650, Tampa, FL 33607, Attention: Investor Relations (telephone: 866-797-2633) or going to Switch and Data’s corporate website at www.switchanddata.com.

SIGNATURES

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