I think I did. Check it out if you get a chance. The problem with it is that it is undiscovered and doesn't trade very often. Has a very big spread.
I spoke with the CEO about getting some market makers to make a real market and to comply with the listing requirements of pinksheets.com. Hopefully, he will do it.
I know several good investors who have taken positions in CTEX but it is as I said very speculative play on emissions detection and control