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).

1. Name and Address of Reporting Person* BYRNES DENNIS (Last) (First) (Middle) 3520 KRAFT ROAD SUITE 300 (Street) NAPLES FL 34105 (City) (State) (Zip)	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 Legal Officer
	3. Date of Earliest Transaction (Month/Day/Year) 02/20/2021
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

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	02/20/2021		D		4,054(1)	D	$42.43	368,719(2)	D
Common Stock	02/23/2021		A		38,326(3)	A	$0.0	407,045	D
Common Stock	02/23/2021		D		17,744(4)	D	$41.46	389,301	D
Common Stock	02/23/2021		A		6,640(5)	A	$0.0	395,941	D
Common Stock	02/23/2021		D		3,074(4)	D	$41.46	392,867	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 one third of his restricted stock units.

2. The amount of securities owned has also been updated to include 291 shares acquired under the Company's Employee Stock Purchase Plan.

3. The performance shares were granted pursuant to the Company's 2016 Equity and Performance Incentive Plan, as amended. The performance shares were earned upon the attainment of certain performance objectives for the period January 1, 2018 through December 31, 2020.

4. Represents shares surrendered by the reporting person to pay the tax liability due upon the vesting of performance shares.

5. The performance shares were granted pursuant to the Company's 2005 Equity and Performance Incentive Plan, as amended. The performance shares were earned upon the attainment of certain performance objectives for the period January 1, 2016 through December 31, 2020.

	Dennis P Byrnes	02/23/2021
	** 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).
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