TRANSACTION SUMMARY

On 19 September 2025, SUSI Partners AG (“SUSI”), the Switzerland-based specialist investment manager focused on energy transition infrastructure, announced that Gresham House, the London-based specialist alternative asset manager, had signed a binding agreement for the acquisition of SUSI.

The transaction combines SUSI’s comprehensive mid-market energy transition investment capabilities across equity and credit with Gresham House’s UK leadership in battery energy storage, positioning Gresham House as a leader in key growth segments of the global infrastructure investment market.

SUSI’s presence in continental European and Southeast Asian markets will enhance Gresham House’s operations in these markets, supporting its ambition to become a leading global alternative asset management firm. With £2.7bn (EUR €3.1bn) in AUM, the combined Energy Transition business will rank among Europe’s top 10 in energy transition asset managers by AUM. The total AUM of the combined business will be £10.2bn (EUR €11.9bn).

Gresham House and SUSI will combine highly complementary investment strategies, client bases, and cultures, allowing for a high degree of operational continuity. From completion, all SUSI employees will join Gresham House and SUSI’s CEO Marco van Daele will lead the newly combined Energy Transition division. SUSI’s portfolio management leads will continue to manage current and follow-on products within the division’s Equity, Credit, and Asia strategies.

SUSI PARTNERS AG

SUSI is a Switzerland-based specialist investment manager with €2bn AUM and an exclusive focus on private market energy transition investments across equity and credit strategies. SUSI primarily invests across Europe and North America but also has a presence in Southeast Asia. SUSI’s clients include a diverse range of institutions.

GRESHAM HOUSE

Gresham House is a London-based specialist alternative asset manager, with £8.7bn AUM comprised of real assets (natural capital, energy transition and social impact) and strategic equity, across a geographic footprint that spans Europe and Australasia, on behalf of institutions, charities and endowments, family offices, private individuals, and their advisers.

ROLE

SHP acted as financial adviser to SUSI.