Summary of ACI WORLDWIDE, INC.

Amendments to Articles of Inc. or Bylaws; Change in Fiscal Year, Financial St

Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On December 12, 2008, the Board of Directors of ACI Worldwide, Inc. (the "Company"), pursuant to Bylaw 38 of the Company's Bylaws, amended Bylaw 8(c) and Bylaw 14(c) and adopted Amended and Restated Bylaws incorporating the amendments (the "Bylaws").

Bylaw 8(c) - Advance Notice Provisions Related to Business Other than Director Nominations

The amendments to Bylaw 8(c) clarified that the advance notice provisions set forth in Bylaw 8(c) related to business to be properly requested by a stockholder to be brought before an annual meeting other than business relating to the nomination or election of directors, which is governed exclusively by Bylaw 14(c). The amendments to Bylaw 8(c) also changed the advance notice provisions to provide that in order to be timely, written notice of any business requested by a stockholder to be brought before an annual meeting must be delivered to or mailed and received at the principal executive offices of the Company not less than 90 calendar days nor greater than 120 calendar days prior to the first anniversary of the date of the immediately preceding year's annual meeting of stockholders. Previously, Bylaw 8(c) set forth an advance notice window of not less than 60 nor more than 90 calendar days prior to the first anniversary of the date on which the Company first mailed its proxy materials for the preceding year's annual meeting of stockholders.

Bylaw 14(c) - Advance Notice Provisions Related to Stockholder Director Nominations

The Company's Board of Directors also amended Bylaw 14(c) to make the same changes to the advance notice window as those described above so that the in order to be timely, written notice of any director nomination by a stockholder must be delivered to or mailed and received at the principal executive offices of the Company not less than 90 calendar days nor greater than 120 calendar days prior to the first anniversary of the date of the immediately preceding year's annual meeting of stockholders. Previously, Bylaw 14(c) set forth an advance notice window of not less than 60 nor more than 90 calendar days prior to the first anniversary of the date on which the Company first mailed its proxy materials for the preceding year's annual meeting of stockholders. The amendments to Bylaw 14(c) also modified the information required to be included in the stockholder notice related to a director nomination to clarify that in addition to the name and address of the stockholder making the nomination, as they appear on the Company's books, the notice must also include the name and principal business address of all (A) persons controlling, directly or indirectly, or acting in concert with, such stockholder, (B) beneficial owners of shares of stock of the Company owned of record or beneficially by such stockholder (with the term "beneficial ownership" as used herein to have the meaning given to that term in Rule 13d-3 under the Exchange Act) and (C) persons controlling, controlled by, or under common control with, any person specified in the foregoing clause (A) or (B) (with the term "control" as used herein to have the meaning given to that term in Rule 405 under the Securities Act of 1933, as amended) (any such person or beneficial owners set forth in the foregoing clauses (A), (B) and (C) shall be a "Stockholder Associated Person" for purposes of Bylaw 14(c)).

The amendments to Bylaw 14(c) also added a requirement that the stockholder notice disclose any derivative positions related to any class or series of securities of the Company held or beneficially held by the stockholder and each Stockholder Associated Person (as defined above); (v) whether and the extent to which any hedging, swap or other transactions or series of transactions have been entered into by or on behalf of, or any other agreement, arrangement or understanding (including any short position or any borrowing or lending of shares of stock) has been made, the effect or intent of which is to mitigate loss to, or manage risk of stock price changes for, or to increase the voting power

of, the stockholder or any Stockholder Associated Person with respect to any shares of stock of the Company.

Bylaw 14(c), as amended, now also provides that, if the Board so requires, to be eligible to be a nominee for election or reelection as a director of the Company, a person must deliver (in accordance with the time periods prescribed for delivery of notice under Bylaw 14(c)) to the Secretary at the principal executive offices of the Company a written questionnaire with respect to the identity, background and qualification of such person and the background of any other person or entity on whose behalf the nomination is being made (which questionnaire shall be provided by the Secretary upon written request) and a written representation and agreement (in the form provided by the Secretary upon written request) that such person (A) is not and will not become a party to
(1) any agreement, arrangement or understanding with, and has not given any commitment or assurance to, any person or entity as to how such person, if elected as a director of the Company, will act or vote on any issue or question (a "Voting Commitment") that has not been disclosed to the Company or (2) any Voting Commitment that could limit or interfere with such person's ability to comply, if elected as a director of the Company, with such person's fiduciary duties under applicable law, (B) is not and will not become a party to any agreement, arrangement or understanding with any person or entity other than the Company with respect to any direct or indirect compensation, reimbursement or indemnification in connection with service or action as a director that has not been disclosed the questionnaire, and (C) in such person's individual capacity and on behalf of any person or entity on whose behalf the nomination is being made, would be in compliance, if elected as a director of the Company, and will comply, with all applicable publicly disclosed corporate governance, conflict of interest, confidentiality and stock ownership and trading policies and guidelines of the Company.

The Amended and Restated Bylaws adopted by the Board of Directors which incorporate the amendments to Bylaw 8(c) and Bylaw 14(c) described above are attached hereto as Exhibit 99.1, and are incorporated by reference herein.