Half full or half empty situation.
When price cuts above 200-day SMA, it is possible that correction (has to be a correction unless you think the business is in a downhill like Yahoo!) is over but we’re not sure. For example, it takes 3 times to be a charm for AAPL in the chart below. Since I’m not sure, prefer to sell half of my holdings at around 200-day ($80s), if it goes down again, I would buy back shares somewhere between $60-$65 (if even lower, long calls). If it runs, then only consider selling above $110, depending on fundamentals. This strategy works so long the business is not screwed, you have to believe that the business is long term growth.