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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): December 27, 2012

Constant Contact, Inc.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (781) 472-8100

(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):

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On December 27, 2012, Constant Contact, Inc. (the “Company”) entered into a Fourth Amendment to Lease (the “Fourth Amendment”) with respect to that certain lease with BP Reservoir Place LLC, as successor in interest to Boston Properties Limited Partnership (the “Landlord”). The lease, as previously amended by the first, second and third amendments, is referred to herein as the “Lease.” Under the terms of the Lease, the Company currently leases 144,603 square feet of office space (the “Current Space”) in Reservoir Place, 1601 Trapelo Road, Waltham, Massachusetts, which is the location of the Company’s principal executive offices. The term of the Lease was scheduled to expire on September 30, 2015.

Under the terms of the Fourth Amendment, the Company has agreed to lease up to 106,723 additional square feet of office space in four tranches as such space becomes available (the “Additional Space”) with the first tranche becoming available on or about April 1, 2013 and the fourth tranche becoming available on or about November 1, 2015. The Fourth Amendment extends the term of the Lease until September 30, 2022 and provides the Company an option to extend the term of the Lease for one ten-year period.

The Fourth Amendment provides that the annual fixed rent for the Current Space shall be as set forth in the Lease until September 30, 2015. Thereafter, the annual fixed rent will be $32.50 per square foot. The annual fixed rent for the Additional Space will be $32.50 per square foot. In addition to the annual fixed rent for the Current Space and the Additional Space, the Company will be responsible for certain costs and charges, including certain operating expenses and real estate taxes, specified in the Fourth Amendment and the Lease. Under the terms of the Fourth Amendment, the Landlord has agreed to provide to the Company an allowance in the amount of $25.00 per square foot for certain costs related to (i) construction of the Additional Space and (ii) refurbishment of the Current Space. The Landlord has granted the Company a right of first offer with respect to certain office space on the property as such space becomes available and has granted the Company an option to lease additional space (approximately 9,356 square feet) in the atrium of the building under certain circumstances. The Fourth Amendment provides that the Company shall increase the amount of the current security deposit held by the Landlord in the form of an irrevocable letter of credit (the “Letter of Credit”) from $750,000 to $1.3 million, which amount may be increased to $1.5 million on or after April 1, 2014 and further increased to $1,875,000 on or after April 1, 2015, subject to the conditions set forth in the Fourth Amendment. The Letter of Credit may also be reduced by 50% of its then current amount on or after January 1, 2018, subject to the conditions set forth in the Fourth Amendment.

The foregoing summary of the Fourth Amendment is subject to, and qualified in its entirety by, the Fourth Amendment attached hereto as Exhibit 10.1 and incorporated herein by reference.

On January 2, 2013, the Company entered into its standard Executive Severance Agreement with Kenneth J. Surdan, the Company’s Senior Vice President, Product, who joined the Company in June 2012.

Under the terms of the Company’s standard Executive Severance Agreement, if an executive’s employment with the Company is terminated by the Company without “Cause” or by the executive for “Good Reason,” the Company will:

The obligations of the Company to provide the foregoing severance and other benefits (other than the Accrued Obligations) is conditioned upon the executive’s execution of a release of claims in the form provided by the Company, and the timing of payments to the executive will be adjusted by the Company to the extent necessary to comply with Section 409A of the Internal Revenue Code of 1986, as amended, and the rules and guidance thereunder.

If the executive’s employment is terminated by the Company for “Cause,” by the executive other than for “Good Reason” or as a result of the executive’s death or “Disability,” then the Company will pay the executive (or the executive’s estate, if applicable), in a lump sum in cash within 30 days after the date of termination (or such earlier date as required by applicable law), the Accrued Obligations. In addition, the Company will comply with the terms of any plan or program under which the executive previously deferred compensation and will timely pay or provide to the executive (or the executive’s estate, if applicable) the Other Benefits to which the executive remains eligible under such termination of employment.

As defined in the standard Executive Severance Agreement:

The foregoing summary of the standard Executive Severance Agreement is subject to, and qualified in its entirety by, the Executive Severance Agreement attached hereto as Exhibit 10.2 and incorporated herein by reference.

(d) Exhibits

The exhibits listed in the accompanying Exhibit Index are filed as part of this Current Report on Form 8-K.

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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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