Diamant Software welcomes Hg as a long-term partner to accelerate innovation, future investment and growth
• 2 minute read
A German version of this press release can be found here.
Bielefeld, Germany — 10 November 2025 — Diamant Software GmbH (“Diamant”), a leading provider of accounting and financial controlling solutions for mid-sized companies and public-sector organisations in Germany, today announced a strategic partnership with Hg, the largest software investor in Europe with over $100 billion in assets under management.
Hg has a 25-year track record of scaling software providers in the tax and accounting sector and will partner with Diamant’s founders, Peter Semmerling and Jan Semmerling, who will remain significant shareholders in the business.
Together, Hg and the Semmerling founding family will focus on delivering value for customers and partners, to secure and enhance Diamant’s long-term success. The partnership will accelerate development of Diamant’s cloud software in the age of AI, further enhance customer service, and strengthen the company’s network of sales partners.
Peter Semmerling, Founder of Diamant Software, said: "For 45 years, Diamant Software has stood for the highest quality, innovation and close partnership with our customers and employees. With Hg we have found a long-term partner and true software expert who shares our values and will support us in taking the next steps in our company’s development. Our customers, partners and employees can rely on continuity, dependability and future-readiness remaining at the centre of everything we do.”
Benedikt Joeris, Partner, Hg, said: “Diamant Software is an excellent example of a fast-growing German software company with clear technical differentiation and deep expertise in accounting and financial controlling. We’re excited to support the company and its people through the next phase of growth, and to invest together in innovation and outstanding customer service – while preserving Diamant’s unique entrepreneurial spirit as the foundation for the journey ahead.”
Terms of the transaction were not disclosed. The transaction is subject to customary closing conditions.
Press contacts
Diamant Software GmbH
Sandra Buschsieweke, marketing@diamant-software.de
+49 (0)521 94260-169
Hg
Tom Eckersley, tom.eckersley@hgcapital.com
Sam Ferris, sam.ferris@hgcapital.com
About Diamant Software
Headquartered in Bielefeld and founded in 1980, Diamant Software develops best-of-breed accounting and controlling software for mid-sized businesses and public-sector organisations. More than 100,000 users rely on Diamant’s award-winning solutions for accounting, controlling and enterprise management. With a clear focus on quality, innovation and customer proximity, Diamant Software is a trusted partner for sustainable business success.
About Hg
Hg is a leading investor in transatlantic software and services businesses. We help to build sector-leading enterprises that supply critical software applications or workflow services to deliver intelligent automation for their customers.
We take an active approach to value creation, combining deep end-market knowledge with world class operational resources to provide compelling support to entrepreneurial leaders looking to scale enduring businesses.
Headquartered in the UK, with a vast European network and strong presence across North America, Hg has more than $100 billion in assets under management and more than 400 employees. Our portfolio spans more than 50 companies worth over $180 billion in aggregate enterprise value, employing more than 125,000 people and consistently growing revenues at more than 20% annually.