I think from memory 4CE holds another stock? Not sure which was ages ago that I read it.
What's your experience with these? I haven't particularly found them to be something the markets get's excited over (non cash assets) unless there is a big shift in their value, but it doesn't generally follow the efficient market hypothesis at all! My guess is that the price of the holding stock would only really get the boost in SP if they sold the asset they held? Otherwise, would only be priced at a percentage (50? 75? 90?) of the actually assets market value.
Just musing, nothing really to contribute other than other ticker (4CE, potentially) for your proxy list