Rockefeller's Standard Oil was possibly even more valuable - at the time of it's anti-trust mandated breakup it produced around 90% of USA's oil. The companies it split into became Exxon, Mobil, Chevron, Amoco, Conoco, Unilever (!) and a whole bunch of others.
I'm playing wiki-facts here, but Unilever bought one of the breakup companies in 1987. The Unilever conglomerate established itself very much without being part of Standard Oil.
