Biggest mistake investors can ever make is looking at their unrealized p and l to determine what to do with a stock. Your money should be in the stocks or bonds that will perform the best with your desired risk. If you think amrn is one of the best choices to make money in the future than hold and even add to it. If you lose say 50k in a stock it does not mean that you have to make the money back in the same company. Holding on to a stock because you are losing money in it makes no sense. If the fundamentals are as good as when you bought it then add to it. If they have changed and are now negative sell and put the money in a stock that can recoup your money. Every day an investor should think that they are buying the stock that day. If you bought a stock at 50 and now iit n is 20 you dont buy or sell because you are down 60 percent. You buy because it is undervalued and sell because it is overvalued. One last point. In general stocks that are down large percentages are usually that way because the fundamentals have deteriorated. If your use unrealized p as d l as a basis for stock ownership you will end up holding the losers and selling the winners. My largest position for the last 20 years is isrg. I have bought and sold it probably 100 times. I always kept between 10 to 12 percent of my portfolio in it. A year and a half ago the fundamentals started to change. Competition from j j and mdt was coming. I lowered my allocation to 7 to 9 percent. I never looked if I was making or losing money. I put the funds in vrt for ai. Crwd because it has become oversold with other SAS stocks. And a high risk bio iova. I believe that combo will outperform isrg going forwatd
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