A non-binding term sheet also gives O3 the option to increase its ownership in the Hungarian fund manager if AUM grows significantly.
The deal marks the sixth investment made by Armen's inaugural GP stakes fund, which targets a portfolio of European alternative asset managers across different strategies.
The deal, which includes future fund commitments, expands Temasek's exposure to Italy's mid-market.
The deal would reportedly expand the firm's presence in Europe and boost its infrastructure exposure.
The partnership will also develop products for wealth investors, beginning with an evergreen private equity secondaries fund expected in the coming weeks.
The deal expands Flexstone's private markets platform with the addition of Glouston's North American middle market secondaries strategy.
The transaction adds nine private equity and credit secondaries strategies to EQT's offering, while its combined evergreen platform now exceeds €10 billion in NAV.
Under the non-binding agreement, O3 may increase its ownership in the social impact investor if certain fund launch and fundraising milestones are met.
The secondary market specialist will remain independently managed by its existing leadership team, with no changes to its investment strategy.
The deal marks Reality Growth's second investment since launching earlier this year as a dedicated GP stakes platform.
