US private equity firm Carlyle’s Global Infrastructure Opportunity Fund will acquire an 82.5% stake in London Southend Airport, a subsidiary of aviation group Esken, formerly Stobart Group, in an agreement to settle £193.75m in debt, with London-based private equity firm Cyrus Capital Partners providing liquidity to Esken.

Alter Domus, a global provider of end-to-end tech-enabled fund administration, private debt, and corporate services for the alternative investment industry, has secured a new strategic investment from private equity firm Cinven.

Summa Equity, an impact investor focused on resource efficiency, changing demographics and tech-enabled transformation, has acquired STIM, a supplier of fish health products and services to the aquaculture sector.

European mid-market private equity firm IK Partners’s IK Small Cap III Fund is to acquire UK passive fire protection specialist Checkmate Fire from Leeds-based private equity firm YFM Equity Partners in the first investment from the fund’s dedicated pool of development capital.

Global growth investor General Atlantic has made a majority investment in Plusgrade, a provider of ancillary revenue solutions for the global travel industry, in a deal that sees Novacap fully exit its stake while another existing investor, CDPQ, remains a significant shareholder.

Global private equity firm OpenGate Capital has entered into exclusive discussions over the sale of SMAC, a supplier of waterproofing and building envelope systems, to Compagnie Financière Jousset and SMAC’s management team.

Private equity firm BC Partners has revived plans to list German academic publisher Springer Nature at a valuation of up to €9bn, including debt, amid improving sentiment for initial public offerings, according to a report by Reuters.

Bluepeak, a provider of fibre broadband to residential and commercial customers in communities across the US and Canada’s Great Plains region, has secured an investment from funds managed by Ares Management’s infrastructure opportunities and alternative credit strategies.