The story
1924: founded as Wohnungsfürsorgegesellschaft Berlin mbH to finance Berlin housing construction
1937: conversion to the housing loan institute of the capital city of Berlin (as a legal municipality)
1965: conversion to the Housing Loan Institute Berlin as a public institute. The Wohnungsbau-Kreditanstalt Berlin becomes a capital collection point for loans according to § 17 Berlin Promotion Act.
1993: conversion into the Investment Bank Berlin under expansion of the tasks on the economic promotion; Integration into Landesbank Berlin as an economically and organizationally independent department
2004: spin-off from the Landesbank Berlin and separation as Investment Bank Berlin, public institute with Anstaltslast and Refinanzierungsgarantie of Berlin
2021: IBB Unternehmensverwaltung Anstalt öffentlichen Rechts (IBB UV) is established by law by the Federal State of Berlin. As the parent company of the group, IBB UV is the owner of IBB and for its part is wholly owned by the Federal State of Berlin. All of IBB’s equity investments are transferred to IBB UV.
From Wikipedia’s article on Investitionsbank Berlin, shared under CC BY-SA 4.0.5