One stock that has been hosed in part because its waste water treatment system business was focused on oil and gas well fracking waste water recycling. Not diversified enough. Also they failed to win or pursue a nasty patent infringement lawsuit against Halliburton that some thought would win ESPH a huge settlement. There is a second private firm involved that is now owned nearly 50% by the Fidelity Investments that owns the rental feet bought from ESPH IIRC. This is an example of stock I called overvalued (little reward for risk value) 2 years ago, but I have watched it closely because I like the tech (it copied about 95% of one of my patents ) With oil and gas in free fall they need to diversify to survive IMHO. Still watching this one from the sidelines
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