Is JD.com (NASDAQ) a good buy? Recent news show that it's going to be listed on HK. Is it riskier to invest in HK?

The reason why these US-listed Chinese-based companies are listing on HK its becos the US SEC are coming after them for lack of disclosure, speak volume when one refuse to get audited. Beside that, Chinese real economy is slowing down with the lack of purchase orders from overseas, do your own due diligence.

There is a ratio between the number of US listed ADR/ADS and the shares issued in HKEX. The price is on par between the two, after factoring in the currency exchange during the IPO.

With the US seeking to audit US-listed Chinese companies and threatening to delist them if there is non-compliance, it would seem that it is safer to invest the HKEX listing. The HKEX is like a fallback if the company decides to delist voluntarily. Then again we do not know how it will play out in future.

There will be some correlation between the price movement but might be perfect due to different market sentiments and movement.

You can look at BABA and 9988 for reference.