Below is a detailed introduction and example regarding margin calls.
When the equity in your account falls below the maintenance margin (MM) level, the company will issue a margin call notice. You must make up the shortfall within 3 trading days upon receiving the notice (including the date of receipt). The margin call amount will be higher than the difference between the MM and the equity.
A client deposits USD 10,000 in cash and USD 5,000 worth of Stock A (initial margin (IM): 30%, MM: 25%), and purchases USD 25,000 worth of Stock B (IM: 50%, MM: 45%). Suppose the market value of Stock B drops to USD 19,500.
After the purchase and the decline in the price of Stock B, the client's holdings are as follows:
Cash deficit | HKD 15,000 |
|---|---|
Holdings IM | HKD 11,250 (HKD 5,000 X 30% + HKD 19,500 X 50%) |
Holdings MM | HKD 10,025 (HKD 5,000 X 25% + HKD 19,500 X 45%) |
Equity in account | HKD 9,500 |
Margin call* | HKD 1,750 |
The client must ensure that the equity in their account meets the margin requirement by the specified date.
If the client chooses to sell securities, the required amount to be sold is no more than the difference between the IM and the equity, divided by the IM ratio.
If the equity falls below the forced liquidation margin, the shortfall must be made up immediately. Otherwise, the positions may be subject to immediate forced liquidation.
Note: The actual amount of margin call may be higher, depending on the nature of the stocks and the company's policies.
Key takeaways:
Disclosures
This article is for reference only and does not constitute any investment advice.
Office hours of HK Hotline and Whatsapp: 9:00 - 18:00 * (GMT+8) on trading days
Office hours of Global Hotline: Trading days 24 hours; Non-trading days 9:00 - 18:00 * (GMT+8)
Outside of the above service hours, if you have any questions, please contact our online customer service.
Office hours of online customer service:
© 2026 Longbridge
* Offers are subject to terms and conditions
A licensed corporation recognized by the SFC (CE No. BPX066). Holder of License Types 1 (Dealing in Securities), 2 (Dealing in Futures Contracts), 4 (Advising on Securities) and 9 (Asset Management). Also a registered HKEX participant and HKSCC participant.
Registered with the Monetary Authority of Singapore (MAS), Long Bridge Securities Pte. Ltd. is a Capital Markets Services Licence holder and Exempt Financial Adviser (Licence No. CMS101211).

A broker dealer registered with the Securities and Exchange Commission (SEC)(CRD: 314519/SEC: 8-70711), a member of the Financial Industry Regulatory Authority (FINRA) and Securities Investor Protection Corporation (SIPC).
New Zealand registered Financial Service Provider (FSP number: FS600050) and a member of the Financial Dispute Resolution Scheme, a New Zealand independent dispute resolution service provider.
The content and materials published here on this website is for general information only and should not be regarded or deemed to be an offer, invitation, or solicitation, recommendation or advice to buy, sell, subscribe or dispose of any investment products or financial services. It does not take into account the specific personal circumstances, investment objectives, financial situation or particular needs of a person and may be subject to change without notice.
Please consult your financial or other professional advisers if you are unsure about the information contained herein. Investments involve risks. Be aware that investments may increase or decrease in value and that past performance is no guarantee of future returns, you may not get back the amount originally invested. You should not make any investment decision based on this content alone.
