Having said that, this stock is far away from any sort of over evaluation and although I never will exclude that we dive again one day maybe to test $400 or $380 again all signs point to a better sentiment in 2020 and more higher highs.
Right now there is an upwards dynamic that will find a stop somewhere but we are in not known territory therefore no one knows and frankly said I don't care anyhow simply because I don't intend to sell a single share for the longer future so why should I bother.
Picked this out to reply to - I've got a similar feeling to the run we went on back in 2013. There was a point in time where after trading in the 20's and 30's for an extended period, there was a surprise profitable quarter, and "suddenly" (without warning), the stock price 'disconnected' (my term) from it's previous trading history, and went off searching for a new trading band.
Or as I like to think of it, the market collectively realized that 20's or 30's wasn't the right valuation, but the market hadn't collectively figured out what the correct valuation was. Over the next 3 to 6 months or so, the stock went from that prior trading range to 180, traded back down to 130, and established that 130 - 180 range as the new share price range.
Maybe that's going to happen now, and maybe it'll even happen at the same scale. Maybe not. I don't know what the new collective market decision will be on the trading range, or even if this is just a brief foray out of the previous trading range, before going back to the 280-380 trading range. (Partly because that's a short range trading question, and I suck at short range trading predictions).
But I'm strongly of the belief that 300's or now 400's isn't the right valuation today. So my mental model, clearly shaped by past experience, is that the next trading range might be more like 1300-1800. And it'll take us a decent chunk of 2020 to get there.
The related thought was the many comments by people who said they were long term investors, but couldn't resist taking their 2x gains off the table at $60, planning to buy back when the stock traded back to $40. Or taking 3x gains at $90, planning to buy back in at $60. To me, those are short term trading decisions and can be exactly the right decision for short term traders (my definition - any trading decision that is influenced by the current or next quarterly results is short term; long term is affected by company strategic plans).
I'm with
@avoigt - I was as indifferent to the $1xx share price as I am to the $4xx share price (outside of the fact I didn't buy more) - both are ridiculously underpriced in my mind; I don't know when the collective market will join me in my valuation; and because I suck at short term trading, I expect that exiting and reentering will also be when the share price comes untethered from the history and I miss some or all of the big move up.
Worth noting - while the $4xx share price doesn't matter any more to me than the $1xx share price, it IS more fun