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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): November 6, 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 2.02. Results of Operation and Financial Condition.
On November 6, 2025, the Company issued a press release announcing its financial results for the three months ended September 30, 2025. A copy of this press release is attached hereto as Exhibit 99.1.
The foregoing information (including the exhibits hereto) is being furnished under “Item 2.02 – Results of Operations and Financial Condition” and “Item 7.01 – Regulation FD Disclosure.” Such information (including the exhibits hereto) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.
The filing of this report and the furnishing of this information pursuant to Items 2.02 and 7.01 do not mean that such information is material or that disclosure of such information is required.
Item 7.01. Regulation FD Disclosure.
See “Item 2.02 – Results of Operation and Financial Condition” above.
Item 9.01. Financial Statements and Exhibits.
(d) Exhibits.

99.1 | Press Release dated November 6, 2025
99.2 | Investor presentation materials dated November 6, 2025
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: November 6, 2025 | By: | /s/ ROBERT W. LEIBROCK
|  | Robert W. Leibrock
|  | Executive Vice President, Chief Financial Officer and Chief Accounting Officer (Principal Financial Officer)