if the company isn't publicly traded they can't always sell even if they want to
It would be bought. That's how stocks work. If there is a promising company, there will be interested buyers.
Well, penny stocks exist. It's possible that Tencent suddenly liquidating their 30% share could bottom out the share value temporarily. If the market decided that Tencent liquidating their holdings was a sign that the company was going under, that should drive the price down, correct?
Could they even sell if nobody is buying?
if the company isn't publicly traded they can't always sell even if they want to
It would be bought. That's how stocks work. If there is a promising company, there will be interested buyers.
Well, penny stocks exist. It's possible that Tencent suddenly liquidating their 30% share could bottom out the share value temporarily. If the market decided that Tencent liquidating their holdings was a sign that the company was going under, that should drive the price down, correct?