SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

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 12, 2012

CONSTANT CONTACT, INC.

(Exact name of registrant as specified in its charter)

1601 Trapelo Road

Waltham, Massachusetts 02451

(Address of principal executive offices, including zip code)

(781) 472-8100

(Registrant’s telephone number, including area code)

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 June 12, 2012, Constant Contact, Inc., a Delaware corporation (“Constant Contact”), SinglePlatform, Corp., a Delaware corporation (“SinglePlatform”), Match Acquisition Corporation, a Delaware corporation and wholly-owned subsidiary of Constant Contact (“Merger Sub”), and Shareholder Representative Services LLC, a Colorado limited liability company, solely in its capacity as Stockholder Representative, entered into an Agreement and Plan of Merger (the “Merger Agreement”). Pursuant to the Merger Agreement, also on June 12, 2012, Merger Sub was merged with and into SinglePlatform, with SinglePlatform continuing as the surviving corporation and a wholly-owned subsidiary of Constant Contact (the “Merger”). The Merger Agreement provided for a cash purchase price of $65 million, which was adjusted to reflect SinglePlatform’s working capital deficit on the acquisition date and certain other transaction expenses as provided for by the Merger Agreement, such that the cash payment at the time of closing was $63.0 million. The cash purchase price is subject to further adjustment for certain working capital adjustments, which are identified by Constant Contact within 90 days of the acquisition date. The Merger Agreement also provided for additional consideration of up to $30 million in earn-out payments based upon SinglePlatform meeting certain revenue targets through June 30, 2014, to be measured in six-month intervals. The terms of the Merger were previously reported in Constant Contact’s Current Report on Form 8-K, as filed with the Securities and Exchange Commission (the “SEC”) on June 13, 2012 (the “Initial Report”). In accordance with Item 9.01(a)(4) of Form 8-K, Constant Contact hereby amends and restates Item 9.01 of the Initial Report and the Exhibit Index to the Initial Report in their entirety as follows:

Item 9.01. Financial Statements and Exhibits.

The following audited financial statements of SinglePlatform are incorporated herein by reference to Exhibit 99.2 to this Amendment No. 1 on Form 8-K/A:

(1) Audited balance sheet of SinglePlatform as of December 31, 2011; and

(2) Audited statements of operations, changes in stockholders’ equity (deficit) and cash flows of SinglePlatform for the year ended December 31, 2011.

The report of PricewaterhouseCoopers LLP is included in Exhibit 99.2 to this Amendment No. 1 on Form 8-K/A and incorporated herein by reference.

The following unaudited financial statements of SinglePlatform are incorporated herein by reference to Exhibit 99.2 to this Amendment No. 1 on Form 8-K/A:

(1) Unaudited balance sheet of SinglePlatform as of March 31, 2012;

(2) Unaudited statements of operations and cash flows of SinglePlatform for the three months ended March 31, 2012 and 2011; and

(3) Unaudited statement of changes in stockholders’ equity (deficit) for the three months ended March 31, 2012.

The following unaudited pro forma financial information is incorporated herein by reference to Exhibit 99.4 to this Amendment No. 1 on Form 8-K/A:

(1) Unaudited pro forma combined consolidated statement of operations of Constant Contact for the year ended December 31, 2011; and

(2) Unaudited pro forma combined consolidated statement of operations of Constant Contact for the three months ended March 31, 2012.

Constant Contact has not provided a pro forma combined consolidated balance sheet as of March 31, 2012 because the Merger is reflected in Constant Contact’s unaudited condensed consolidated balance sheet as of June 30, 2012 included in Constant Contact’s Quarterly Report on Form 10-Q for the three months ended June 30, 2012 and filed with the SEC on August 1, 2012.

See Exhibit Index hereto, which is incorporated by reference into this Item 9.01 of this Amendment No. 1 on Form 8-K/A.

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SIGNATURE

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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EXHIBIT INDEX

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