Similar comment that I have given on the selling stock by the senior management in Nvidia. This is the right of those senior management and it has shown they are also great in the personal financial management. 

Even with their selling, the share price is still going up. It has proven that most investors either individual or corporate are still having strong confident in the performance of Palantir. 

Recently, there are a few persons are having their analysis thesis to try to convince others that shall "sell" their share on hand, also there is one top corporate investor has sold their stock at a much lower price in Early Oct and November, but all these has indeed lost much on their reaction. 

I am still holding strong confident on Palantir in long term! 

Again, my way of protecting my investment is always set a "stop-loss" with a margin from the latest price. It means that if the share price increases, I will adjust higher accordingly.