Well I for one think you're barking up the right tree.
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Looks like 10 bucks held
It's clear that selling at $13 was a very very compelling option; given that at the time the share was overpriced. If you sold at $13 and found an actual bargain in the market to replace ATM with, you would be on the path to doing very well. ATM has experienced extreme growth and there are certainly lower risk shares that could produce similar or greater returns from here.