Dual Listing Shares

There are some SGX shares dual listing on HKEX. Few days ago LHN dual listed on HKEX. 

LHN listed on HKEX on 29 December 2017, and the price jumped as much as 37.9% in early trade. The share price closed at 3.23 HKD on first trading day compared to their ipo price at 1.90 HKD. LHN SG share price closed at 0.235 on the same trading day. There was a big price gap between them. 

I just realised that we can actually convert our shares from SGX to HKEX by submitting a form to our broker. However, we also need a trading account in Hong Kong to receive the shares. 

If we have a trading account in Hong Kong, is it possible to buy shares before the IPO and convert them into Hong Kong shares after dual listed? In LHN case, the ipo price in Hong Kong was 1.90 HKD or around 0.32 SGD. 

At the time of writing, LHN HK closed at 4.19 HKD or 0.71 SGD and LHN SG closed at 0.315 SGD. Perhaps next time should go Hong Kong to open a trading account to catch this kind of opportunity.

Thanks for reading.