Besseges is an active fire protection and facilities management business for the retail, commercial and education sectors.
ISPN CEO Jeff Neblett and President and Chief Financial Officer Scott Lauber will continue leading the firm.
The buyer is L Squared Capital Partners.
Blackstone is 'positioning itself to be the largest financial investor in AI infrastructure in the world,' said Stephen Schwarzman.
M&A was the largest driver of growth for AssuredPartners, which acquired 500 businesses over the past 13 years, before the $13.45bn sale to Gallagher.
ENSO is an integrated bioenergy platform, specializing in the engineering, development, financing, construction, operation and supply of electric, thermal and cogeneration biomass plants.
Alcura France is a specialized distributor of home care services.
The investment values UTB at around £520 million.
The investment values Ardonagh at $14bn.
Major deals in 2024 includes EQT’s €2.9bn sale of Idealista, a real estate platform, to Cinven.