ACI Worldwide, Inc. engages in the development, marketing, installation, and support of software products and solutions primarily focused on facilitating real-time electronic payments. It operates through the following segments: ACI on Premise and ACI on Demand. Read More The ACI on Premise segment serves customers who manage their software on site. The ACI on Demand segment covers the needs of banks, financial intermediaries, merchants, and corporates who use payments to facilitate their core business. The company was founded in 1975 and is headquartered in Naples, FL. The listed name for ACIW is ACI Worldwide, Inc. Common Stock.