IMPV Imperva, Inc.

As filed with the Securities and Exchange Commission on January 10, 2019

Registration No. 333-228181

333-224758

333-222380

333-219850

333-217756

333-211221

333-207825

333-206243

333-202423

333-198216

333-194955

333-194208

333-186779

333-179552

333-177845

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Post-Effective Amendment No. 1

to Registration Statements on

Form S-8

UNDER THE SECURITIES ACT OF 1933

3400 Bridge Parkway

Redwood Shores, California 94065

(Address of principal executive offices) (Zip Code)

The Prevoty, Inc. First Amended and Restated 2013 Stock Incentive Plan

Imperva, Inc. 2011 Employee Stock Purchase Plan

Imperva, Inc. Amended and Restated 2015 Equity Inducement Plan

Imperva, Inc. 2011 Stock Option and Incentive Plan, as Amended

Incapsula, Inc. 2010 Stock Incentive Plan

Imperva, Inc. 2003 Stock Plan

Inducement Stock Option Plan and Agreement

Inducement Restricted Stock Unit Plan and Agreement

Skyfence Networks Ltd. 2013 Share Incentive Plan

(Full title of plans)

Mike Burns

Chief Financial Officer

Imperva, Inc.

3400 Bridge Parkway

Redwood Shores, California 94065

(Name and address of agent for service)

(650) 345-9000

(Telephone number, including area code, of agent for service)

Copies to:

Shulamite White, Esq.

General Counsel

Imperva, Inc.

3400 Bridge Parkway

Redwood Shores, CA 94065

Telephone: (650) 345-9000

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the Registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.  ☐

Pursuant to the Agreement and Plan of Merger (the “Merger Agreement”), dated October 10, 2018, by and among Imperial Purchaser, LLC, a Delaware limited liability company (“Newco”), Imperial Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Newco (“Merger Sub”) and the Company, Merger Sub merged with and into the Company, and the Company continued as the surviving corporation and as a wholly owned subsidiary of Newco (the “Merger”).

As a result of the Merger, the Company has terminated all offerings of its securities pursuant to the Registration Statements. The Company is filing a post-effective amendment for each Registration Statement pursuant to Rule 478 under the Securities Act of 1933, as amended, and the undertakings in each Registration Statement, to remove from registration any of the securities registered thereunder that remain unsold as of the date hereof.