Gresham House Holdings Limited has announced a definitive agreement to acquire SUSI Partners AG, a Swiss investment manager specialising in energy transition infrastructure. The transaction positions the British firm among the top ten asset managers in Europe in this sector, with a combined assets under management (AUM) of £2.7bn ($3.3bn).
A global investment platform expansion
The integration of the two firms will allow Gresham House to expand its global infrastructure investment platform by combining its UK energy storage expertise with SUSI Partners’ equity and credit investment capabilities. The newly formed Energy Transition division will be led by Marco van Daele, current Chief Executive Officer of SUSI Partners.
The combined activities will now span continental Europe and Southeast Asia, supporting Gresham House’s ambition to grow internationally. This acquisition is part of an external growth strategy focused on co-investments, tailored solutions, and cross-asset strategies.
Team integration and operational continuity
All employees from SUSI Partners will join Gresham House upon closing. Operational continuity will be maintained, with Ben Guest continuing to lead the UK-based energy storage team. Portfolio managers from SUSI will remain in charge of existing and follow-on products in equity, credit, and Asian markets.
The transaction is subject to customary closing conditions, including regulatory approvals. Financial terms of the deal have not been disclosed.
Accelerated growth and future product development
Following the acquisition, Gresham House will increase its total AUM to £10.2bn ($12.5bn), consolidating its position in the alternative investment space. Beyond energy infrastructure, the firm also invests in natural capital, forestry, sustainable real estate, and private equity.
SUSI Partners will remain focused on its equity strategy and aims to expand its European infrastructure credit activities while preparing a follow-on strategy for Southeast Asia scheduled for 2026. The complementary expertise of both firms is expected to generate new opportunities in energy transition asset management.
