Abacus alpha

About Abacus alpha

Abacus alpha GmbH (registered in Frankenthal, Pfalz, at Eisenbahnstraße 4-6) is a German family-office-backed private equity investment company operating with an evergreen mandate. The firm was founded in 2006 as a wholly-owned subsidiary of Johannes und Jacob Klein GmbH, the Klein family holding entity that also controls a majority stake in publicly-listed industrial pump and valve manufacturer KSB SE and Co. KGaA (15,500-plus employees, €2.2 billion annual revenue). Headquarters sit in Frankenthal, in the Rhineland-Palatinate region of southwest Germany. The structure is explicitly that of a family-office-affiliated private equity investment company rather than a fund-style limited partner and general partner vehicle, with no fund vintage cycle and no external limited partners. Capital deployment operates from the Klein family balance sheet with theoretically unlimited investment duration, captured in the firm published mantra of buy, hold and build. Assets under management are not publicly disclosed. Portfolio metrics indicate approximately 22 cumulative investments made and roughly 16 to 20 current portfolio holdings employing approximately 1,000 employees across the cluster.

Investment thesis

Abacus alpha pursues a permanent-capital private equity strategy operating through both minority and majority equity positions, with current portfolio comprising six 100-percent-owned companies and twelve minority and majority stakes. The firm explicitly applies a buy-and-hold plus buy-and-build dual playbook combining long-duration ownership with bolt-on acquisitions consolidating sub-sector platforms. Sector focus targets three primary clusters: automation, digitalization and electrical engineering, clean and green technology, and personnel and industrial services. The firm explicitly invests in technology-oriented German SMEs operating in energy, water, wastewater, materials, Industry 4.0, robotics, AI, sports technology and interim management services, while explicitly excluding pharmaceuticals, chemicals, biotech and pure exit-oriented financial-engineering deals. Geographic scope is primarily German-speaking DACH with selective international holdings. Ticket size band is not publicly disclosed, but the portfolio mix suggests Mittelstand-scale investments typically targeting €5 to €30 million revenue companies in technology-enabled industrial niches. There is no traditional limited partner base, with the sole capital source being the Klein family holding company.

Recent activity

Recent portfolio investments include MTS Metal Solutions GmbH in industrials and innovative materials (26 March 2025), Salinnova GmbH in industrials and cleantech (high-pressure pump machine builder integrated into the Abacus Resale platform), Fireboard GmbH in software and SaaS (digital incident command software for fire departments and public safety authorities) and VinRoc Solutions GmbH in industrials and Industry 4.0 (co-founded by Abacus alpha as a vision-sensors, robotics and AI enabler). Additional active holdings include AddVolt SA in cleantech, airinotec GmbH in industrials, ASB Systembau Horst Babinsky GmbH in industrials, Jumag Dampferzeuger in industrials, Ludwig Heuse GmbH in services, PersonalHub Holding in services and SMART PR in services. Recent realisations include PYREG GmbH in cleantech and industrials (2020), AIM Service Italia in services (2024) and VSR Elektrotechnik GmbH in industrials (2025). Detailed buyer names and multiple data available on Pro at €29/month.