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MML Keystone I surpasses $1b in oversubscribed debut capital raise
Fundraising - DECEMBER 19, 2025

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MML Keystone I surpasses $1b in oversubscribed debut capital raise

by Kali Arevalo

MML Capital Partners has raised €935 million ($1.1 billion) in a final closing of its MML Keystone I fund and accompanying co-investment and managed vehicles.

Commitments came from a globally diverse group of blue-chip institutional investors, including pension funds, consultants, asset managers, funds-of-funds and family offices from Europe, North America, Asia, Australia and the Middle East.

MML Keystone is a differentiated strategy investing at the intersection of private equity and infrastructure in the United Kingdom and Europe. It focuses on high-growth, asset-backed businesses in the lower-mid market providing essential services that accelerate and benefit from societal megatrends such as the circular economy, the energy transition, digitalization, access to healthcare, and education.

The fund’s investments are characterized by strong downside protection, underpinned by infrastructure-like attributes such as strong market positions with high barriers

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