The strategic partnership also saw Madison commit capital to four of Matter's co-investment strategies.
The deal would reportedly expand the firm's presence in Europe and boost its infrastructure exposure.
The deal will support the UK housebuilder's expansion toward 7,000 homes a year, with Apollo retaining control.
The partnership will also develop products for wealth investors, beginning with an evergreen private equity secondaries fund expected in the coming weeks.
The transaction, expected to close in Q4, will support the growth of AREP's investment and development platform, including its vertically integrated data center strategy.
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.
