Exhibit 99.1

News Release

ACI Worldwide, Inc. Reports Financial

Results for the Quarter Ended March 31, 2014

HIGHLIGHTS

NAPLES, FLA — May 1, 2014 — ACI Worldwide, Inc. (NASDAQ:ACIW), a leading international provider of payment systems, today announced financial results for the period ended March 31, 2014. Management will host a conference call at 8:30 am EST to discuss these results as well as 2014 guidance. Interested persons may access a real-time audio broadcast of the teleconference at www.aciworldwide.com/investors or use the following numbers for dial in participation: US/Canada: (866) 914-7436, International/Local: +1 (817) 385-9117. Please provide your name, the conference name ACI Worldwide, Inc. and conference code 25558357. There will be a replay available for two weeks on (855) 859-2056 for US/Canada Dial-In and +1 (404) 537- 3406 for International/Local Dial-In participants.

“ACI started 2014 strong with results that position us well to achieve our full year expectations,” commented Phil Heasley, ACI President and CEO. “Net new bookings were particularly robust as we are clearly seeing interest in our Universal Payments-enabled solutions.”

FINANCIAL SUMMARY

Financial Results for Q1

Revenue in Q1 was $221 million, an increase of $59 million, or 37%, above the prior year quarter. The acquisition of Official Payments and incremental revenue from Online Resources contributed $33 million and $29 million, respectively, to the increase in revenue compared to the prior year quarter.

New sales bookings, net of term extensions (SNET) increased 59% compared to the prior year quarter. Our 12-month backlog increased by $13 million from last quarter to $883 million, while our 60- month backlog increased by $49 million from last quarter to $3.91 billion.

Operating income was $0.3 million for the quarter, versus a loss of $4 million in the prior year quarter. Adjusted EBITDA of $32 million grew 46%, or $10 million above last year’s $22 million. Net EBITDA margin in Q1 2014 represented 16% versus 14% margin last year, after adjusting for $28 million and $1 million of pass through interchange in Q1 2014 and Q1 2013, respectively.

Q1 GAAP net loss was $6 million, or ($0.15) per diluted share, versus a net loss of $2 million, or ($0.05) per diluted share in Q1 2013. The variance was primarily driven by increased interest expense and foreign currency fluctuations.

We ended the first quarter with $59 million in cash on hand. Operating free cash flow (OFCF) for the quarter was $15 million, down from $34 million in Q1 of last year. The quarter ended with a debt balance of $779 million. We repurchased 1.2 million shares of our stock in the quarter for approximately $70 million and have approximately $138 million remaining on our current authorization.

Reiterating Guidance

We continue to expect to generate non-GAAP revenue in a range of $1.06 to $1.08 billion for the full year and now forecast non-GAAP revenue of $240 to $250 million in the second quarter. Adjusted EBITDA expectations remain in a range of $290 to $300 million. This guidance excludes $13 to $15 million of one-time integration-related expenses and includes $2 million for the deferred revenue adjustments. Lastly, our full year 2014 net new sales bookings growth is expected to be in the upper single digit range.

End-

About ACI Worldwide

ACI Worldwide powers electronic payments and banking for more than 5,000 financial institutions, retailers, billers and processors around the world. ACI software enables $13 trillion in payments each day, processing transactions for more than 250 of the leading global retailers, and 18 of the world’s 20 largest banks. Through our comprehensive suite of software products and hosted services, we deliver a broad range of solutions for payments processing; card and merchant management; online banking; mobile, branch and voice banking; fraud detection; trade finance; and electronic bill presentment and payment. To learn more about ACI, please visit www.aciworldwide.com. You can also find us on Twitter @ACI_Worldwide.

For more information contact:

John Kraft, Vice President, Investor Relations & Strategic Analysis

ACI Worldwide

239-403-4627

john.kraft@aciworldwide.com

To supplement our financial results presented on a GAAP basis, we use the non-GAAP measures indicated in the tables, which exclude certain business combination accounting entries related to the acquisitions of S1 Corporation and Online Resources Corporation and significant transaction related expenses, as well as other significant non-cash expenses such as depreciation, amortization and share-based compensation, that we believe are helpful in understanding our past financial performance and our future results. The presentation of these non-GAAP financial measures should be considered in addition to our GAAP results and are not intended to be considered in isolation or as a substitute for the financial information prepared and presented in accordance with GAAP. Management generally compensates for limitations in the use of non-GAAP financial measures by relying on comparable GAAP financial measures and providing investors with a reconciliation of non-GAAP financial measures only in addition to and in conjunction with results presented in accordance with GAAP. We believe that these non-GAAP financial measures reflect an additional way of viewing aspects of our operations that, when viewed with our GAAP results, provide a more complete understanding of factors and trends affecting our business. Certain non-GAAP measures include:

ACI is also presenting operating free cash flow, which is defined as net cash provided by operating activities, plus net after-tax payments associated with employee-related actions and facility closures, net after-tax payments associated with significant transaction related costs, net after-tax payments associated with IBM IT outsourcing transition and termination, and less capital expenditures. Operating free cash flow is considered a non-GAAP financial measure as defined by SEC Regulation G. We utilize this non-GAAP financial measure, and believe it is useful to investors, as an indicator of cash flow available for debt repayment and other investing activities, such as capital investments and acquisitions. We utilize operating free cash flow as a further indicator of operating performance and for planning investing activities. Operating free cash flow should be considered in addition to, rather than as a substitute for, net cash provided by operating activities. A limitation of operating free cash flow is that it does not represent the total increase or decrease in the cash balance for the period. This measure also does not exclude mandatory debt service obligations and, therefore, does not represent the residual cash flow available for discretionary expenditures. We believe that operating free cash flow is useful to investors to provide disclosures of our operating results on the same basis as that used by our management.

ACI also includes backlog estimates, which include all software license fees, maintenance fees and services specified in executed contracts, as well as revenues from assumed contract renewals to the extent that we believe recognition of the related revenue will occur within the corresponding backlog period. We have historically included assumed renewals in backlog estimates based upon automatic renewal provisions in the executed contract and our historic experience with customer renewal rates.

Backlog is considered a non-GAAP financial measure as defined by SEC Regulation G. Our 60-month backlog estimate represents expected revenues from existing customers using the following key assumptions:

Estimates of future financial results are inherently unreliable. Our backlog estimates require substantial judgment and are based on a number of assumptions as described above. These assumptions may turn out to be inaccurate or wrong, including for reasons outside of management’s control. For example, our customers may attempt to renegotiate or terminate their contracts for a number of reasons, including mergers, changes in their financial condition, or general changes in economic conditions in the customer’s industry or geographic location, or we may experience delays in the development or delivery of products or services specified in customer contracts which may cause the actual renewal rates and amounts to differ from historical experiences. Changes in foreign currency exchange rates may also impact the amount of revenue actually recognized in future periods. Accordingly, there can be no assurance that contracts included in backlog estimates will actually generate the specified revenues or that the actual revenues will be generated within the corresponding 60-month period.

Backlog should be considered in addition to, rather than as a substitute for, reported revenue and deferred revenue.

Forward-Looking Statements

This press release contains forward-looking statements based on current expectations that involve a number of risks and uncertainties. Generally, forward-looking statements do not relate strictly to historical or current facts and may include words or phrases such as “believes,” “will,” “expects,” “anticipates,” “intends,” and words and phrases of similar impact. The forward-looking statements are made pursuant to safe harbor provisions of the Private Securities Litigation Reform Act of 1995.

Forward-looking statements in this press release include, but are not limited to, statements regarding: (i) interest in our Universal Payments-enabled solutions; (ii) expectations regarding revenue and adjusted EBITDA; (iii) expectations regarding Q2 2014 revenue; and (iv) expectations regarding 2014 financial guidance related to sales, net of term.

All of the foregoing forward-looking statements are expressly qualified by the risk factors discussed in our filings with the Securities and Exchange Commission. Such factors include but are not limited to, increased competition, the performance of our strategic product, BASE24-eps, demand for our products, restrictions and other financial covenants in our credit facility, consolidations and failures in the financial services industry, customer reluctance to switch to a new vendor, the accuracy of management’s backlog estimates, the maturity of certain products, our strategy to migrate customers to our next generation products, ratable or deferred recognition of certain revenue associated with customer migrations and the maturity of certain of our products, failure to obtain renewals of customer contracts or to obtain such renewals on favorable terms, delay or cancellation of customer projects or inaccurate project completion estimates, volatility and disruption of the capital and credit markets and adverse changes in the global economy, our existing levels of debt, impairment of our goodwill or intangible assets, litigation, future acquisitions, strategic partnerships and investments, risks related to the expected benefits to be achieved in the transaction with Online Resources and Official Payments, the complexity of our products and services and the risk that they may contain hidden defects or be subjected to security breaches or viruses, compliance of our products with applicable legislation, governmental regulations and industry standards, our compliance with privacy regulations, the protection of our intellectual property in intellectual property

litigation, the cyclical nature of our revenue and earnings and the accuracy of forecasts due to the concentration of revenue generating activity during the final weeks of each quarter, business interruptions or failure of our information technology and communication systems, our offshore software development activities, risks from operating internationally, including fluctuations in currency exchange rates, exposure to unknown tax liabilities, and volatility in our stock price. For a detailed discussion of these risk factors, parties that are relying on the forward-looking statements should review our filings with the Securities and Exchange Commission, including our most recently filed Annual Report on Form 10-K, Registration Statement on Form S-4, and subsequent reports on Forms 10-Q and 8-K.

ACI WORLDWIDE, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(unaudited and in thousands, except share and per share amounts)

ACI WORLDWIDE, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited and in thousands, except per share amounts)

ACI WORLDWIDE, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited and in thousands)

ACI Worldwide, Inc.

Reconciliation of Selected GAAP Measures to Non-GAAP Measures (1)

(unaudited and in thousands, except per share data)