ACI Worldwide CFO returns 3,176 shares for taxes

The surrendered shares covered tax liability tied to vesting 6,854 shares, one twelfth of restricted stock units granted September 24, 2025.

Rhea-AI Filing Summary

ACI WORLDWIDE, INC. (symbol: ACIW) is the issuer of record for a Form 4 filing submitted to the SEC. Leibrock Robert William reported disposition transactions in this Form 4 filing.

ACI Worldwide, Inc. Chief Financial Officer Robert William Leibrock returned 3,176 common shares to the issuer on September 24, 2026, at a reported $49.62 per share. The shares were surrendered to pay tax liability due upon vesting. His reported direct holdings afterward were 200,725 shares.

Insider Trade Summary

Disposition: 3,176 shares

Disposition 1 txn

Insider Leibrock Robert William

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Disposition	Common Stock F1	3,176	$49.62	$158K

Holdings After Transaction: Common Stock — 200,725 shares (Direct)

Footnotes (1)

1. F1. Represents shares surrendered by the reporting person to pay the tax liability due upon the vesting of 6,854 shares, representing one twelfth of the restricted stock units granted on September 24, 2025.

Key Figures

Shares returned to issuer: 3,176 shares Reported price per share: $49.62 per share Direct holdings after transaction: 200,725 shares +1 more

4 metrics

Shares returned to issuer 3,176 shares September 24, 2026

Reported price per share $49.62 per share Transaction on September 24, 2026

Direct holdings after transaction 200,725 shares Reported after the transaction

Shares whose vesting triggered tax liability 6,854 shares Represented one twelfth of the restricted stock units granted on September 24, 2025

Key Terms

restricted stock units, vesting, tax liability

3 terms

restricted stock units financial

"restricted stock units granted on September 24, 2025"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vesting financial

"tax liability due upon the vesting of 6,854 shares"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

tax liability financial

"shares surrendered by the reporting person to pay the tax liability"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares did ACIW CFO Robert William Leibrock return, and at what price?

Robert William Leibrock returned 3,176 shares of common stock to the issuer on September 24, 2026, at a reported $49.62 per share. His reported direct holdings afterward were 200,725 shares.

Why did ACIW CFO Robert William Leibrock surrender shares?

The shares were surrendered to pay tax liability due upon vesting of 6,854 shares, representing one twelfth of the restricted stock units granted on September 24, 2025.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/25/2026 - 05:51 PM Accepted by SEC EDGAR 09/25/2026 - 05:49 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Leibrock Robert William

(Last) (First) (Middle)

6060 COVENTRY DRIVE

(Street)

ELKHORN NEBRASKA 68022

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ACI WORLDWIDE, INC. [ ACIW ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/24/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/24/2026		D		3,176(1)	D	$49.62	200,725	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares surrendered by the reporting person to pay the tax liability due upon the vesting of 6,854 shares, representing one twelfth of the restricted stock units granted on September 24, 2025.

Remarks:

	Robert William Leibrock	09/25/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)