Regarding Ying Li, I am also vested, but went in at too high a price, so I'm stuck! There is an analyst report that they should book more gains at this coming Quarter's report, so I am mildly hopeful. But on hindsight, my own analysis concluded that the performance track record the last few years have not really been that great. Coupled with the CEO's departure and the S-chips fiasco, the price drop has been quite brutal. Still hoping for a better set of results at the coming reporting season. Hope it helps.
I don't venture much out of the prop sector, but I did own Singrand for a while, but was a bit wary after the share price seems trapped by an artificial ceiling of about 78ct, despite all the very positive write-ups of the impending IPO of Garden Fresh. Based on available figures, I would imagine the stock at more than $1 by now, and failure to do so makes me wonder if I don't know something that the sellers know.
The chart of Ying Li seems to speak of trouble, even if I don't know anything about its fundamentals. EMS Energy was part of the penny energy play, which could be over, for now. For penny stocks, one never knows what surprises (or lack of) the stock will generate, but that's part of their characteristics that you will have to live with if you decide to own them.
YZJ is an institutional stock, and you can probably read ample analyst reports on the stock if you Google.
I think Hankore is interesting, and I own a bit of it. You must know that it will soon consolidate its shares and will be a Penny counter no more. There are also ample reports on Hankore, so I won't go into the details. But this is the only stock in your list that I own.