PEIX has been in play lately for some intra-day trades but if you are looking at buying it as a long term investment you need to do the historical research for at least 10 years in the past. Determine sales, cash flow, debt, EPS, etc. to see if it is a profitable company. Also not only if it is a profitable company but if it is a "deal" to buy right now. You don't want to pay full sticker price for a car that is actually worth a lot less...