They are either a sacco or PE who are basically speculators - on land or stocks. Britam raises cash via insurance and investments in real estate or using its fund manager arm.
The issue with a sacco is you raise money quickly through contributions without creating any real products... but members get to borrow which strains cashflow.
A PE has to court investors through a very impressive track record. Like Zimele... tough to start but can go exponential with time. Most saccos don't have the skill to play the stock market and do only real estate. The "asset" is member contributions or pensions.