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): June 1, 2016

DEMANDWARE, INC.

(Exact Name of Company as Specified in Charter)

Company’s telephone number, including area code: (888) 553-9216

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 (see General Instruction A.2. below):

Item 8.01 Other Events.

As previously disclosed in the Current Report on Form 8-K filed on June 1, 2016 by Demandware, Inc. (the “Company”), on May 31, 2016, the Company, salesforce.com, inc., a Delaware corporation (“Parent”), and Parent’s newly formed, wholly owned subsidiary, Dynasty Acquisition Corp., a Delaware corporation (the “Purchaser”), entered into an Agreement and Plan of Merger (the “Merger Agreement”), pursuant to which the Purchaser will commence a cash tender offer (the “Offer”) to purchase all of the outstanding shares of common stock of the Company. Following the consummation of the Offer, the Purchaser will merge with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Parent, subject to the terms and conditions set forth in the Merger Agreement.

On June 1, 2016, the Company made available to its employees, in connection with the announcement of the execution of the Merger Agreement, a set of frequently asked questions (the “Employee FAQ”). A copy of the Employee FAQ is filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

On June 1, 2016, the Company and Parent held a joint investor conference call in connection with the announcement of the execution of the Merger Agreement. A transcript of the conference call is filed as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference.

On June 1, 2016, the Company made available the blog post by Thomas D. Ebling, President and Chief Executive Officer of the Company, a copy of which is filed as Exhibit 99.3 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

See the Exhibit Index attached to this Current Report on Form 8-K, which is incorporated herein by reference.

Additional Information

The tender offer has not yet commenced. This document is neither an offer to purchase nor a solicitation of an offer to sell any securities. At the time the tender offer is commenced, Salesforce will file with the Securities and Exchange Commission (“SEC”) a Tender Offer Statement on Schedule TO, and Demandware will file a Solicitation/Recommendation Statement on Schedule 14D-9 with respect to the tender offer. Demandware stockholders and other investors are strongly advised to read the tender offer materials (including the Offer to Purchase, the related Letter of Transmittal and certain other tender offer documents that have yet to be filed) and the Solicitation/Recommendation Statement because they will contain important information that should be read carefully before any decision is made with respect to the tender offer. The Tender Offer Statement and the Solicitation/Recommendation Statement will be available for free at the SEC’s website at www.sec.gov. Free copies of these materials and other tender offer documents will be made available by the information agent for the tender offer.

In addition to the Offer to Purchase, the related Letter of Transmittal and certain other tender offer documents, Salesforce and Demandware file annual, quarterly and special reports,

proxy statements and other information with the SEC. You may read and copy any reports, statements or other information filed by the parties at the SEC public reference room at 100 F Street, N.E., Washington, D.C. 20549. Please call the Commission at 1-800-SEC-0330 for further information on the public reference room. The parties’ filings with the SEC are also available to the public from commercial document-retrieval services and at the website maintained by the SEC at www.sec.gov.

Forward-Looking Statements

This document contains “forward-looking statements” relating to the acquisition of Demandware by Salesforce. All statements other than historical facts included in this document including, but not limited to, statements regarding the timing and the closing of the transaction, the financing for the transaction, the expected benefits of the transaction, prospective performance and future business plans, and any assumptions underlying any of the foregoing, are forward-looking statements. These statements are based on current expectations of future events. If underlying assumptions prove inaccurate or unknown, or unknown risks or uncertainties materialize, actual results could vary materially from the parties’ expectations and projections. Risks and uncertainties include, among other things, uncertainties regarding the timing of the closing of the transaction; uncertainties as to how many of Demandware’s stockholders may tender their stock in the tender offer; the possibility that various closing conditions to the tender offer and merger transactions may not be satisfied or waived, including that a governmental entity may prohibit, delay, or refuse to grant approval for the consummation of the transaction; that there is a material adverse change to Demandware; the outcome of any legal proceedings that may be instituted in connection with the transaction; that the integration of Demandware’s business into Salesforce is not as successful as expected; the failure to realize anticipated synergies and cost savings; the failure of Salesforce to achieve the expected financial and commercial results from the transaction; other business effects, including effects of industry, economic or political conditions outside either company’s control; transaction costs; actual or contingent liabilities; as well as other cautionary statements contained elsewhere herein and in Salesforce’s and Demandware’s periodic reports filed with the SEC including the factors set forth in their most recent annual reports on Form 10-K and quarterly reports on Form 10-Q, the Tender Offer Statement on Schedule TO and other tender offer documents to be filed by Salesforce, and the Solicitation/Recommendation Statement on Schedule 14D-9 to be filed by Demandware. These forward-looking statements reflect Salesforce’s expectations as of the date of this document. Salesforce undertakes no obligation to update the information provided herein.

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.