HKD/ USD reached the 7.75 strong-side Convertibility Undertaking (CU), prompting the Hong Kong Monetary Authority (HKMA) to intervene by injecting funds into the market, which increased the balance of the Hong Kong banking system from $45 billion at the end of April to about $174 billion as of 8 May, driving the HIBOR down, according to a research report issued by Citi Research. As of 8 May, one-month HIBOR has fallen to 2.09%, down by a total of 1.86 ppts during the month. The broker believed that this may bring short-term pressure on banks' net interest margin (NIM), while an one-month HIBOR below 2.2% may lead to a repricing of mortgage loan interest rates.Related NewsHTSC: STANCHART Has Earnings Growth Potential & Quality Shareholder Returns; Tariff Impact Expected to Be Manageable OverallFor every 25 bps drop in Hong Kong's interest rates, HANG SENG BANK (00011.HK) -0.100 (-0.090%) Short selling $14.94M; Ratio 18.959% / BOC HONG KONG (02388.HK) -0.060 (-0.184%) Short selling $27.04M; Ratio 17.550% will face downward pressure on their profits before tax of 1.3%/ 2.1%, while HSBC/ Stanchart will face a negative impact of 0.3%/ 0.2%, according to Citi Research's estimations.(HK stocks quote is delayed for at least 15 mins.Short Selling Data as at 2025-05-14 12:25.)