Who knows maybe the owner of Samsung and Apple might have invested in bitcoin but they won't tell others about it. It is also possible that Mark Zuckerberg invested in Bitcoin, if they do I hope they will consider to accept bitcoin in the future.
I think they do invest in bitcoin most of the millionaires do it and that is why i think they are never going to lose their money becausre they keep investing and investing and the only thing they are making is profit in every possible way.
Of course you are right that they dont like risks but it doesnt mean that they are not interested new technologies. Bitcoins have attracted most of the billionaires towards itself because of its amazing characteristics i.e. decentralized economy, secured and stable. They invest in bitcoins but with low capitals to avoid risky situations.