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): April 7, 2015

EPIQ SYSTEMS, INC.

(Exact name of registrant as specified in its charter)

501 Kansas Avenue

Kansas City, Kansas 66105

(Address of principal executive offices, including zip code)

(913) 621-9500

(Registrant’s telephone number, including area code)

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):

On April 7, 2015, Epiq Systems, Inc., a Missouri corporation (“Epiq Systems”), and two of its wholly-owned subsidiaries, Epiq Systems Acquisition, Inc., a New York corporation (“Buyer”), and Epiq Systems, Ltd., a private limited company organized and existing under the laws of the United Kingdom (“UK Buyer”), entered into a Stock Purchase Agreement (including its related exhibits, schedules, and ancillary agreements, the “Agreement”) with Iris Data Services, Inc., a Texas corporation (“Iris Data Services”), R. Kent Teague II, an individual resident of the State of Texas (the “Seller”), and certain key participants. In accordance with the Agreement, Iris Data Services will sell its German and United Kingdom subsidiaries to the UK Buyer, and the Buyer will acquire 100% of the equity interests in Iris Data Services. Iris Data Services is a leading provider of eDiscovery managed services. The closing of the acquisition is expected to occur on or about April 30, 2015.

The aggregate consideration for the acquisition is approximately $134 million subject to certain post-closing adjustments. Of the aggregate consideration, approximately $67 million (less an amount placed in escrow as described below) will be paid to the Seller, and the remaining $67 million (less an amount placed in escrow as described below) will be distributed by Iris Data Services following the closing of the acquisition to participants in the Amended and Restated Iris Data Services, Inc. Participation Plan effective April 7, 2015, in accordance with the terms of the plan and the Agreement. Such post-closing distribution is expected to result in a post-closing tax benefit to Epiq Systems of approximately $23 million. In addition, of the aggregate consideration, approximately $13 million will be placed in escrow as security for potential future indemnification claims. Epiq Systems intends to fund the acquisition with existing cash and borrowings under the company’s credit facility.

The Agreement contains certain customary representations and warranties and imposes certain customary covenants on the parties regarding pre-closing activities, post-closing cooperation, confidentiality, tax matters, and non-solicitation of employees and customers. The Agreement also contains customary indemnities and closing conditions.

There is no material relationship between Epiq Systems, the Buyer and the UK Buyer, or any of their respective affiliates, on the one hand, and Iris Data Services, the Seller and such key participants, or any of their respective affiliates, on the other hand, other than the Agreement.

On April 8, 2015, Epiq Systems issued a press release announcing the entry into the Agreement. The press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The following item is filed as an exhibit to this Current Report on Form 8-K.

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.

EXHIBIT INDEX