ACI Worldwide (ACIW) DEFA14A Additional proxy soliciting materials

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934

Filed by the Registrantþ
Filed by a Party other than the Registranto

Check the appropriate box:

o Preliminary Proxy Statement

o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

o Definitive Proxy Statement

þ Definitive Additional Materials

o Soliciting Material Pursuant to §240.14a-12

ACI Worldwide, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

þ No fee required.

o Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

(1)	Title of each class of securities to which transaction applies:
(2)	Aggregate number of securities to which transaction applies:
(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
(4)	Proposed maximum aggregate value of transaction:
(5)	Total fee paid:

o Fee paid previously with preliminary materials.

o Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

(1)	Amount Previously Paid:
(2)	Form, Schedule or Registration Statement No.:
(3)	Filing Party:
(4)	Date Filed:

Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to be held on June 10, 2009, for ACI Worldwide, Inc. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. To view the proxy statement and annual report, go to www.proxydocs.com/aciw. To submit your proxy while visiting this site, you will need the 12 digit control number in the box below. Under new United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the Internet. We have chosen to use these procedures for our 2009 Annual Meeting and need YOUR participation. If you want to receive a paper or e-mail copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year’s annual meeting, please make this request on or before June 1, 2009. View Proxy Materials and Annual Report Online at www.proxydocs.com/aciw A convenient way to view proxy materials and VOTE! Material may be requested by one of the following methods: TELEPHONE (866) 648-8133 INTERNET www.investorelections.com/aciw *E-MAIL paper@investorelections.com * If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located below) in the subject line. No other requests, instructions or other inquiries should be included with your e-mail requesting material. You must use the 12 digit control number located in the shaded gray box below. To view your proxy materials online, go to www.proxydocs.com/aciw. Have the 12 digit control number available when you access the website and follow the instructions. ACCOUNT NO. # SHARES ACI Worldwide, Inc. Notice of Annual Meeting of Stockholders Date: Wednesday, June 10, 2009 Time: 8:30 a.m. EDT Place: ACI Worldwide, Inc., 120 Broadway, Suite 3350, New York, NY 10271 We are holding the meeting to: 1. Elect eight directors to our Board of Directors to hold office until the 2010 Annual Meeting of Stockholders; and 2. Transact such other business as may properly come before the Annual Meeting and any adjournment or postponement. The eight directors up for re-election are: Alfred R. Berkeley, III, John D. Curtis, Philip G. Heasley, James C. McGroddy, Harlan F. Seymour, John M. Shay, Jr., John E. Stokely, and Jan H. Suwinski. The Board of Directors recommends that you vote FOR all nominees for director. Our Board of Directors has fixed the close of business on April 13, 2009 as the record date for determining the stockholders entitled to notice of and to vote at the Annual Meeting and any adjournment. Each share of our common stock is entitled to one vote on all matters presented at the Annual Meeting. Vote In Person Instructions: While we encourage stockholders to vote by the means indicated above, a stockholder is entitled to vote in person at the Annual Meeting. Additionally, a stockholder who has submitted a proxy before the meeting, may revoke that proxy in person at the Annual Meeting.