There were a few well known companies that were merged into IG Farben, and they were split back out after the war. Several of them still exist and are very wel

There were a few well known companies that were merged into IG Farben, and they were split back out after the war. Several of them still exist and are very well known. There were also spinoffs and mergers that happened later, and bit sand pieces of some very large chemical and pharmaceutical companies can trace parts of their lineage back to IG Farben. The summary on Wikipedia covers it pretty decently.