Palm oil is an interesting and little known business, but unfortunately it has a reputation for being monstrously environmentally destructive, resulting in widespread deforestation. It also has a reputation for worker abuse. For these reasons, Kellogg just committed to switching to ethically-produced palm oil over the next few years. It will be interesting to see if this sparks a wider trend as consumers demand greater accountability from their food providers.
The most interesting company I know of that deals in palm oil production is Camellia (LON:CAM). Camellia also owns other assets like a private bank and a securities portfolio, and trades far below the value of its assets. However, I really doubt that management is at all interested in closing the gap.