| 2023 | Effective November, 1, Robert Klaffus has been appointed to the Management Board of PSI Software SE as CEO. |
| 2023 | Company name change of the former PSI Software AG to PSI Software SE. |
| 2021 | Effective 1 July 2021, Gunnar Glöckner has been appointed to the Management Board of PSI Software SE as Chief Financial Officer. |
| 2020 | PSI acquires prognosis software provider Prognos Energy GmbH and the Swiss network planning software specialist NEPLAN AG. |
| 2019 | Takeover of the Network Control Software Segment PRINS of BTC Business Technology Consulting AG. In May, PSI celebrates its 50th anniversary - a half a century of process know-how. |
| 2018 | AI-based PSI software solutions for vehicle production and charging management support the accelerated growth of electromobility. |
| 2017 | Company name of PSI Aktiengesellschaft für Produkte und Systeme der Informationstechnologie changes to PSI Software AG. |
| 2016 | Company name of PSIPENTA changes to PSI Automotive & Industry GmbH. |
| 2015 | PSI makes further progress on the future topic of the Industrial Internet in the context of several research projects. |
| 2014 | Takeover of the strongest competitor in the metals industry, Broner Metals. |
| 2013 | PSI subsidiary founded in Brazil. |
| 2012 | Strengthening of the energy business with the acquisition of the Time-steps AG. |
| 2011 | PSI subsidiary founded in North America. |
| 2010 | PSI develops first integrated mining control system. |
| 2009 | PSI celebrates its 40th anniversary. Since 1969, PSI develops and integrates software solutions and complete systems for utilities, manufacturers, logistics and infrastructure providers. |
| 2008 | Formation of a subsidiary and a joint venture in Russia. International expansion in the metals, production and energy industry. |
| 2007 | Process control system for efficient raw materials production; market entry into the Russian steel and electricity industry. |
| 2006 | Opening of representative office in Russia; new sales partnerships in Eastern Europe and Asia. |
| 2005 | First major orders from Chinese steel industry and expansion of the logistics division to Russia. |
| 2004 | PSI subsidiaries founded in Poland and China. |
| 2003 | PSI develops the first integrated control system for controlling complex manufacturing processes. |
| 2002 | Generation shift in top management; Restructure of PSI into an integrated control system enterprise. |
| 2000 | PSI acquires the gas management system division from debis Systems and starts internationalization of its energy business. |
| 1998 | Initial public offering (IPO) on August 31. |
| 1996 | Development of the first object-oriented ERP system PSIpenta. |
| 1994 | The company is converted into a joint-stock corporation. |
| 1986 | Market launch of PIUSS-O, the company’s first standard software product for production planning (PPS). |
| 1976 | The company wins its first large order from the energy supply sector. |
| 1974 | PSI is the first German company to introduce an employee stock option plan. |
| 1969 | PSI Gesellschaft für Prozesssteuerungs- und Informationssysteme GmbH is founded in Berlin. First order from the steel industry. |
