HI, today HKFE changes margin requirement to HKD110,720 for one contract of HSI
IB now has a 4% rule, current HSI is at 22964 (HSIQ7)
22964*4%*50=HKD45,928
50% of HKFE margin is 110720*50%=HKD55,360
I expected the HSI intraday margin to be max(4% rule margin, 50% HKFE margin)=HKD55,360...