Quantity allocation for periodic call auction when opening price is formed in the upper or lower limit price

In case of periodic call auction, trading is concluded according to the principle of priority in price·time, but as far as opening price is formed in the upper or lower limit price, allocation of concluded quantities shall be made in sequence from the largest quantities of an offer price to the smallest ones on the basis of principle of priority in quantity as shown in the following order while allocation of other cases shall be in the principle of time priority.

  • 100 times of trading quantity unit
  • a half of balance (quantity below the said unit shall be rounded off to the nearest integer)
  • remainder

If opening price is determined as KRW20,150 (the upper price limit), for instance, quantities at selling offer price shall be allocated according to the order of priority in quantity between buying offers at the upper price limit.

status of offer price
status of offer price
Selling order(Q'ty) price Buying order(Q'ty)
4,000 1,500 600 (6,100) 20,150 (16,200) ①
1,000		 ②
200		 ③
10,000		 ④
5,000
1,700 1,500 (3,200) 20,100 500 700
1,300 1,000 (2,300) 20,050 400
800 (800) 20,000
700 (700) 19,950
13,100 total 16,200
주의No. ①, ② & etc mean the sequences of receiving offer price
outcome of trading
outcome of trading
category No.③ offer price
(10,000 shares)		 No.④ offer price
(5,000 shares)		 No.① offer price
(1,000 shares)		 No.② offer price
(200 shares)
100 times of trading units 100 100 100 100
a half of balance 4,950 2,450 450 50
remainder 4,800
executed quantity
(13,100 shares)		 9,850 2,550 550 150