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): September 8, 2025

Commission File Number 0-25346

ACI WORLDWIDE, INC.

(Exact name of registrant as specified in its charter)

Delaware

47-0772104

(State or other jurisdiction of incorporation or organization)

(I.R.S. Employer Identification No.)

6060 Coventry Drive

Elkhorn,

Nebraska

68022

(Address of Principal Executive Offices)

(Zip Code)

(402) 390-7600

(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:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, $0.005 par value

ACIW

Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

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 13(a) of the Exchange Act. ☐

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Effective September 30, 2025, the position of Chief Revenue Officer will be eliminated and the functions will be addressed by the general managers of the payment software and biller segments and the regional sales leaders. As a result, Mr. Alessandro Silva will be leaving the Company on that date. In connection with his departure, the Company will provide customary benefits under its severance policy.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

The following exhibit is filed with this report on Form 8-K:


Exhibit No.			Description
104			Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 thereunto duly authorized.


	ACI WORLDWIDE, INC. (Registrant)

Date: September 12, 2025	By:	/s/ DENNIS P. BYRNES
		Dennis P. Byrnes
		Executive Vice President and General Counsel

ACI WORLDWIDE, INC. 8-K