I own one stock. It's the remnants of my 401(k) company match as well as some exercised stock options outside the 401(k). In total, I'd estimate it at roughly 6% of my port. I'm estimating because, for one thing, I don't know exactly what the stock value (reduced for what i owe our Uncle Sam) amounts to. The stock price, i know to the penny each day (if I looked). Now, 6% of one stock might sound like a lot (or heck, maybe a little). At one time, this stock was 70+% of my port as it exploded in value within my 401(k) over a 10 year period. I was able to divest myself of most of it before it shrank to a 1/3 it's highest value. Now, you might ask, why would I keep such a stock (old megacorp, hasn't recovered from big loss in '08, same price it was in '99, blah, blah blah). Well, it's got a low PE ratio (now that it's lost 2/3) AND it's paying over 5% dividend. That's better than anything in my port is doing! So, for now, I'm going to hang on and see what happens. Over my 36 year career, whenever I thought about buying some of this stuff (but never did outside of the 401K)) I always regretted not buying. So now, at least I'll hold.
Oh, I do own one other stock. It's the stock in the family business. It's not even OTC so, it really has no value other than the assets of the company or what my fellow shareholders might pay me to buy me out. I'm calling it 5% of my port and that's a total guess.
I'm okay with my decision on both of these stocks though with a "do over", I would have dumped megacorp at it's high!!! Hind sight and 20/20, and YMMV, etc. etc.