Re- "locking in gains" I have to wonder if this is part of the reason the wealthy just get wealthier.
I absolutely understand if you have 500k in TSLA, it's life changing, and you run the risk of dropping 50% or something so locking in seems to be the safe play. But in the case where someone has 10, maybe 20 million or more, certainly it's not ideal if they dropped 50% but their life doesn't change any. They can just hold until it's higher again. I think this scenario where you're not longer concerned about your personal finances allows a much longer holding period and in the case of Tesla hopefully realizing gains for many many more years into the future.
Just a thought, I'm super happy for anyone taking gains - you've earned it. I personally don't have any better places to put my money if I were to sell so until something dramatic happens I think I'll be holding for 10 years. Even if an event does happen, there should be some warning of a downturn in most scenarios, or perhaps the theoretical -50% event will be after the stock has appreciated >100% from today.
Not advice, it could tank tomorrow, you gotta follow your own plans/strategy. I'm just curious if the large players have the same mentality because they don't carry the same risks.