Statement of Changes in Beneficial Ownership (4)

FORM 4

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

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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3235-0287

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

1. Name and Address of Reporting Person * BYRNES DENNIS	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) EVP, General Counsel & Sec.
(Last)          (First)          (Middle) 3520 KRAFT ROAD, SUITE 300	3. Date of Earliest Transaction (MM/DD/YYYY) 8/24/2020
(Street) NAPLES, FL 34105 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	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. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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	8/24/2020		M		13152	A	$8.8767	385634 (1)	D
Common Stock	8/24/2020		S		13152	D	$30.0077 (2)	372482	D
Common Stock	8/25/2020		M		35133	A	$8.8767	407615	D
Common Stock	8/25/2020		S		35133	D	$30.0465 (3)	372482	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		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 of Derivative Security: 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
Non-Qualified Stock Option (right to buy)	$8.8767	8/24/2020		M			13152	(4)	12/1/2020	Common Stock	13152	$0.0	35133	D
Non-Qualified Stock Option (right to buy)	$8.8767	8/25/2020		M			35133	(4)	12/1/2020	Common Stock	35133	$0.0	0	D

Explanation of Responses:
(1)	The amount of securities owned has also been updated to include 428 shares acquired under the Company's Employee Stock Purchase Plan.
(2)	The sale price ranged from $30.00 to $30.09, with a weighted average sale price of $30.007727. Upon request, the reporting person hereby undertakes to provide to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(3)	The sale price ranged from $30.00 to $30.31, with a weighted average sale price of $30.046537. Upon request, the reporting person hereby undertakes to provide to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(4)	The shares identified herein were sold pursuant to the cashless exercise of options granted to Mr. Byrnes on December 1, 2010. Such options would have otherwise expired in accordance with their terms on December 1, 2020.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
BYRNES DENNIS 3520 KRAFT ROAD SUITE 300 NAPLES, FL 34105			EVP, General Counsel & Sec.

Signatures
Dennis P Byrnes		8/26/2020
**Signature of Reporting Person		Date