# PSI Software
PSI Software SE is a Berlin-based German enterprise software company, founded in 1969, that builds process control systems for energy grids, industrial production, and logistics, and since mid-2026 has been majority-controlled by the private equity firm [Warburg Pincus](https://www.edgepedia.org/warburg-pincus) while, by its own description, continuing to operate as an independent software producer with around 2,250 employees.[1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se) The company was taken private through a voluntary public takeover offer priced at 45 euros per share, valuing its equity at more than 700 million euros (about $811 million), and signed a delisting agreement on 8 September 2026.[2](https://www.reuters.com/business/warburg-pincus-buy-germanys-psi-over-700-million-euros-2025-10-13/) • [1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se)
| Key fact | Detail |
| --- | --- |
| Founded | 1969, Berlin[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) |
| Sector | Process control and industrial software for energy grids, production, and logistics, on-premises or cloud[1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se) |
| 2025 revenue | EUR 285.5 million, up 9.5% from EUR 260.8 million in 2024[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) |
| Headcount | 2,380 on 31 December 2025 (about 2,250 cited as of September 2026)[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) • [1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se) |
| Takeover | Warburg Pincus, EUR 45.00 per share, more than EUR 700 million (about $811 million) equity value, agreed 13 October 2025[2](https://www.reuters.com/business/warburg-pincus-buy-germanys-psi-over-700-million-euros-2025-10-13/) • [4](https://www.reuters.com/business/warburg-pincus-nears-deal-buy-germanys-psi-more-than-700-million-euros-sources-2025-10-12/) |
| Status, September 2026 | Majority-owned by Warburg Pincus via Zest BidCo GmbH; delisting agreement signed 8 September 2026[1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se) |
## What PSI does
PSI develops process control systems: software that monitors, optimizes, and controls operations in energy supply, production, and logistics. In its own announcement, the company describes itself as a technology leader in this field since 1969, combining AI methods with industrially proven optimization, and offers its systems operable on-premises or in the cloud.[1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se) Its largest unit is Grid & Energy Management, which generated EUR 140.9 million of revenue in 2025, a 21.9% increase and 49.4% of consolidated revenues; the group also comprises business units for Process Industries & Metals, Discrete Manufacturing and [Logistics](https://www.edgepedia.org/logistics).[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) Recurring revenues across the group were EUR 112.1 million in 2025.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf)
## History
PSI was established in 1969, which the company describes as making it one of the most experienced German software companies.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) In 2024 it adopted a strategy called "PSI reloaded", intended to transform the group into an integrated software company centered on a SaaS and cloud "Control System of the Future" platform, supported by a Google Cloud partnership.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) The company's annual report also records that a February 2024 cyberattack was investigated by the Supervisory Board.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf)
In 2025, PSI was included in the SDAX on 22 December 2025, and its share closed the year at EUR 45, 113.3% above the prior year's close.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf)
## Business and financials before the takeover
The 2024 fiscal year framed the sale. Consolidated revenues stood at EUR 260.8 million in 2024, and the group posted a negative adjusted EBIT margin of -5.8%.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) In 2025 the trajectory reversed: revenues rose 9.5% to EUR 285.5 million and new orders rose 25.3% to EUR 322 million.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) The group reached its targeted adjusted EBIT margin of 4.1%, or EUR 11.7 million, while the unadjusted operating result was EUR -21.0 million (a -7.3% margin), burdened by restructuring, M&A, and costs connected with the Warburg Pincus takeover offer.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) Headcount stood at 2,380 on 31 December 2025, down 2.2% from 2,434, across locations in 17 countries.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf)
## The 2025–26 takeover, by the numbers
In October 2025 PSI confirmed it was in advanced discussions with three bidders, Warburg Pincus, Thoma Bravo, and HgCapital, regarding a takeover, with [Goldman Sachs](https://www.edgepedia.org/goldman-sachs) running the sales process; PSI and Goldman Sachs declined to comment further.[4](https://www.reuters.com/business/warburg-pincus-nears-deal-buy-germanys-psi-more-than-700-million-euros-sources-2025-10-12/) On 13 October 2025 the firms announced that Warburg Pincus had agreed to buy PSI at 45 euros per share, a premium of more than a third over the previous Friday's closing price, valuing the company at more than 700 million euros (about $811 million), with shareholder and customer E.ON remaining a strategic investor.[2](https://www.reuters.com/business/warburg-pincus-buy-germanys-psi-over-700-million-euros-2025-10-13/) • [4](https://www.reuters.com/business/warburg-pincus-nears-deal-buy-germanys-psi-more-than-700-million-euros-sources-2025-10-12/) PSI shares jumped 35% to 44.9 euros, their highest level since January 2022, after rising nearly 11% the previous Friday; Warburg Pincus said it would maintain PSI's management structure.[2](https://www.reuters.com/business/warburg-pincus-buy-germanys-psi-over-700-million-euros-2025-10-13/)
The offer's structure and progress were disclosed in stages. After the additional acceptance period expired on 2 January 2026, the bidder had secured approximately 81.72% of all PSI shares through tendered shares, shares already held, and shares to be acquired from an anchor shareholder, plus cash-settled financial instruments relating to a further 6.52%, for a stated total of 88.24%; closing was expected in the first quarter of 2026, subject to outstanding regulatory clearances, with delisting intended as soon as possible after settlement.[5](https://www.eqs-news.com/news/corporate/endgueltiges-ergebnis-des-oeffentlichen-uebernahmeangebots-fuer-psi-warburg-pincus-erreicht-8324-aller-psi-aktien/9cead71a-5f2c-4715-bffa-8b1cc09013fc) The offer was completed in mid-2026 following approval by the [Federal Ministry for Economic Affairs and Energy](https://www.edgepedia.org/federal-ministry-for-economic-affairs-and-energy), Germany's foreign-investment screening authority, and PSI carried out a capital increase in July 2026.[1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se)
The delisting and the offer are, per PSI's announcement, a component of a strategic partnership among PSI, Warburg Pincus, and E.ON under an Investment Agreement dated 12 October 2025.[1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se)
## Status and recent developments
2024 ended with revenues of EUR 260.8 million and a negative adjusted EBIT margin of -5.8%; the "PSI reloaded" restructuring was adopted in 2024 and the sale process followed in 2025. 2025 brought revenue and order growth, an SDAX listing, the Warburg Pincus offer, foreign-investment clearance, settlement mid-2026, a July 2026 capital increase and, on 8 September 2026, a delisting agreement under which Zest BidCo GmbH, a holding company indirectly controlled by Warburg Pincus funds, announced a public delisting acquisition offer at the statutory minimum six-month weighted-average price.[3](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf) • [1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se) The company describes itself as an independent software producer with around 2,250 employees at that date; the sources do not record any renaming, integration into another group, or shutdown.[1](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se)
## References
1. [PSI enters into a Delisting Agreement with Warburg Pincus (PSI Software SE press release, 8 September 2026)](https://www.psi.de/en/company/newsroom/press-releases/psi-enters-into-a-delisting-agreement-with-warburg-pincus-warburg-pincus-announces-public-delisting-acquisition-offer-for-psi-software-se)
2. [Warburg Pincus to buy Germany's PSI for over 700 million euros (Reuters, 13 October 2025)](https://www.reuters.com/business/warburg-pincus-buy-germanys-psi-over-700-million-euros-2025-10-13/)
3. [PSI Software SE Annual Report 2025](https://www.psi.de/fileadmin/downloads/en/company/investor_relations/Reports/annual_reports/PSI_2025e.pdf)
4. [Exclusive: Warburg Pincus nears deal to buy Germany's PSI for more than 700 million euros, sources say (Reuters, 12 October 2025)](https://www.reuters.com/business/warburg-pincus-nears-deal-buy-germanys-psi-more-than-700-million-euros-sources-2025-10-12/)
5. [Final results of the public takeover offer for PSI: Warburg Pincus attains 83.24% of all PSI shares (EQS News, 8 January 2026)](https://www.eqs-news.com/news/corporate/endgueltiges-ergebnis-des-oeffentlichen-uebernahmeangebots-fuer-psi-warburg-pincus-erreicht-8324-aller-psi-aktien/9cead71a-5f2c-4715-bffa-8b1cc09013fc)
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