Two of the owners (10% holdings each )purchased around $30 million of stocks. Considering they have so much spare money means they are pretty good with finances and they also believe there is good potential of growth for their company. Last time I made a trade based on insider trading was with Netflix. Around Sep 2016, I purchased NFLX for $97 and, unhappy with their slow progress, I sold them a week later at $94. Now they're around $155.
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I am not sure if the two owners (Patricia and Thomas Frist) actually purchased the amount of shares I mentioned. This information is from finviz.com, but other websites don't show this. I don't know what's the situation.
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The stock increased very nicely, from $83 in Feb 2017 to $131 in Aug 2018 (57%). My stop loss was too restrictive, it was only one day when the price dropped below it.