Unfortunately chuckage is another thing to consider. If everyone buys the stock whilst it's moving, there will be a lot of wasted chuckage.
The problem with these big IPO's is ideally the amount of shares available is key. Admin must preferably try and predict a number that will "sell out" creating a bigger demand to buy early as to avoid movement of the stock on the first day already. It's rather tough as the IPO in question was a whopping H$200, and the majority of players cannot afford to purchase the max 100k amount, meaning that even though there was a big interest to purchase this stock, there was just not enough funds available by active players to purchase 150m shares.