I do very much agree on holding long term, but sometimes the costs of getting out are worth it when the fundamentals of the business has changed.
In the case of NFLX, I remember looking at them 10 years ago or so, then the price doubled and I decided to stay away and forgot about them. About 4-5 years ago I started paying attention again but I felt the price was too high. As they started slipping in 2011, I followed more closely, and bought some once it looked like the business had started to turn around in early 2013. Staying invested from the 2011 peak until now, you basically matched the broader index return, so on the surface not much opportunity cost seems lost…
But, lets say you sold out of NFLX near the peak and waited until they broke $100 on the upswing. If you were in a tax free account, the amount you saved by not participating in the way down would increase the amount of your holding by 163%! Even if you paid 40% taxes as short term gains on your entire position in 2011 (which is unlikely given the time to get to the 2011 peak) you would still be better off by 58% by selling out and getting back in once things have turned around.
I’ve said this with UA and LULU. I sold about half of UA and put it into LULU a few years back mainly because UA was bigger than I wanted in my portfolio and I was not a happy consumer of the product at the time and I saw LULU apparel taking off with women everywhere. In retrospect, it was a great move at the time, but I didn’t give enough weight to the problems LULU started having. Ideally moved funds back to UA at the time would have let a lot more capital participate in the growth run UA has had, which would have been best case.
Since I didn’t do the the UA position is smaller than it could be and the LULU position is only a small gain.
In this case, staying the course on UA would have done better for me than staying in both until now, but getting out of LULU and back to UA or something else when problems started happening would have been best rather than watching the gains disappear as the problems were worse than I thought.
Since late 2010:
LULU +16%
SPY +61%
UA +355%
So by staying in UA, I would have had much better gains on it all than I do now, but had I sold LULU before the decline and gone back to UA, there would have been a lot more capital there to participate in the 200% growth UA has seen since it started catching up with LULU.
Lesson learned on this example.
To summarize my thinking
Good = staying the course with a good company
Better = changing allocations as the company fluctuates between more and less good
Even with taxes and transaction fees, the extra gains can be pretty significant, but it does take a lot more work.
I think that is the crux of what Saul is talking about when we see things in the business that have fundamentally changed… but it definitely takes a lot of work to learn how to get it right.