Most institutions own substantial amounts of btc, It helps to diversify their portfolio. I don't think it is a big secret even if it is not widely talked about
Yep, some of them do hold Bitcoin, only those of them that really understand how it works and why they should invest in it. Who wouldnt like to buy Bitcoin when they have money to invest in it? Just check out Bitcoin price in 2010, there have been a lot of changes. That same 2010, Laszlo Hanyecz bought a pizza for 10,000 BTC, if he knew it would get to this level, he would have preferred to just store and by now he would be one of the richest people that invested in bitcoin cause the price he would have made in 2017 would be surplus.
have you ever asked if some companies are seriously investing in Cryptos and still not talking about it?
Uhhhm, we dont even know that yet. But most of them would have interest in creating their own coins than to invest in other markets. But we never know, since theres no way to tell those that are buying and selling Bitcoin, its possible that anyone can be investing their money in Bitcoin or any other cryptocurrency and you will not even know about it.