The frozen amount generated during the pre-IPO market trading process = the cumulative net selling amount of the pre-IPO market stocks.
1. If you buy 2000HKD pre-IPO stock A. The frozen amount at this time = 0HKD
2. Following the example above, if you sell another 3000HKD pre-IPO stock A. The frozen amount at this time = 1000HKD
3. Following the example above, if you buy 4000HKD stock B in the pre-IPO market. The frozen amount at this time = 1000HKD
4. Following the example above, if you sell 5000HKD stock B in the pre-IPO market. The frozen amount at this time = 2000HKD
That is, the final frozen amount = the net selling amount of pre-IPO stock A + the net selling amount of pre-IPO stock B.