The Central Clearing and Settlement System, known as CCASS, is the electronic infrastructure that finalizes securities trades in Hong Kong. Operated by Hong Kong Securities Clearing Company Limited (HKSCC), it replaces physical certificate transfers with computerized book-entry records and stands as the central counterparty to every eligible trade on the Stock Exchange of Hong Kong. The system runs under the Securities and Futures Ordinance (Cap. 571), which designates HKSCC as a recognized clearing house with authority to set rules, collect obligations, and manage defaults.
If you trade or hold Hong Kong-listed shares through a broker or custodian, your transactions move through CCASS. Here is what the system actually does, who plugs into it, and the costs and risks it manages.
How a Trade Settles
The settlement cycle begins the moment a trade executes on the exchange. Exchange trades follow a T+2 timeline: shares and money change hands two business days after the trade date.1Hong Kong Exchanges and Clearing Limited. Settlement – Securities Trade data flows automatically from the exchange into CCASS for verification.
During confirmation, the system generates reports that let clearing members review their daily activity and matches buy and sell orders on quantity, price, and counterparty. Discrepancies must be corrected within set windows. By the close of the second business day, digital balances update across all involved accounts to reflect the completed transfer.
Share delivery and payment happen simultaneously, a principle called delivery versus payment. Neither side has to hand over value without receiving something in return.
Daily Windows
For standard eligible securities, settlement instruction functions open at 7:15 a.m. and close at 7:00 p.m. for maintenance, with final upload functions shutting at 7:30 p.m.2Hong Kong Exchanges and Clearing Limited. HKSCC Operational Procedures – Section 6 Settlement China Connect securities close settlement instruction maintenance at 7:45 p.m. Hours apply Monday through Friday, excluding public holidays, and HKSCC reserves the right to change them.
Continuous Net Settlement and Novation
The engine behind CCASS settlement is Continuous Net Settlement (CNS). When a trade is accepted into CNS, novation takes place: HKSCC steps in as the central counterparty, becoming the buyer to every seller and the seller to every buyer.3Hong Kong Exchanges and Clearing Limited. Clearing Service – Securities If your counterparty defaults, you still get paid. HKSCC guarantees the other side of the trade.
The system then nets each participant’s positions. A participant that buys 10,000 shares and sells 7,000 shares of the same stock in a single day owes only 3,000 net. The same logic applies to cash, producing one payment or receipt per participant per day rather than dozens of individual transfers.
Not every trade goes through the netting pool. Isolated Trades settle on a one-to-one basis, separate from daily net positions, and are typically used for block trades or transactions a participant wants to keep distinct from regular flow.
Who Can Participate
HKSCC restricts direct access to entities meeting financial and operational admission standards, and each category carries different rights and obligations under the CCASS Rules.4Hong Kong Exchanges and Clearing Limited. General Rules of CCASS
- Direct Clearing Participants are typically brokerage firms that clear only their own exchange trades and those of their direct clients. The admission fee is HK$50,000 per Stock Exchange Trading Right held.5Hong Kong Exchanges and Clearing Limited. Becoming a HKSCC Participant
- General Clearing Participants can clear for themselves, their clients, and other brokers who lack direct access. Requirements are much steeper: minimum liquid capital of HK$300 million, or paid-up share capital of at least HK$300 million combined with liquid capital of no less than HK$100 million.6Hong Kong Exchanges and Clearing Limited. Third Party Clearing
- Custodian Participants are institutions such as pension funds and insurance companies that need professional safekeeping. The admission fee is HK$1,000,000.
- Investor Participants are individuals holding securities directly in CCASS rather than through a broker. They submit instructions through the CCASS Phone System, Internet System, or the Customer Service Centre.
Managing the Risk of a Default
Because HKSCC guarantees every novated trade, the clearing house needs layered tools to cover the risk of a participant failing. Most are collected daily.
Marks and Margin
HKSCC marks every open CNS position to market, measuring how far the current price has moved from the original trade price. Where a position has moved against a participant, HKSCC collects the difference as a “mark,” a cash deposit covering current exposure.7Hong Kong Exchanges and Clearing Limited. CCASS Operational Procedures – Section 10 Exchange Trades CNS System On top of marks, HKSCC collects margin to cover estimated future price movements before settlement completes, and can require concentration collateral from participants with outsized positions in a single security. Obligations can be met in cash or approved collateral securities, subject to caps on non-cash pledges.
Late Delivery Fees and Buy-Ins
A participant that fails to deliver securities on the T+2 due date faces a default fee of 0.50% of the market value of the undelivered position, based on that day’s closing price, capped at HK$100,000 per position.8Hong Kong Exchanges and Clearing Limited. HKSCC Operational Procedures – Section 21 Costs and Expenses HKSCC may grant a buy-in exemption if the participant provides satisfactory evidence of a qualifying reason by T+3, with supporting documents due by T+6. If an exemption is granted but delivery still doesn’t happen, the fee is charged again. Providing false information to obtain an exemption is treated as misconduct and can trigger disciplinary action. Where no exemption applies, HKSCC purchases the missing shares on the open market and charges the defaulting participant for the cost.
The Guarantee Fund
All clearing participants contribute to the Guarantee Fund, the financial backstop when a defaulter’s own collateral falls short. As of April 2026, the Guarantee Fund threshold stands at HK$7,300 million.9Hong Kong Exchanges and Clearing Limited. Monthly Review on Guarantee Fund – Circular ORM/CRC/110/2026 Each contribution splits into a Basic Contribution and a Dynamic Contribution, both calculated from the participant’s share of the average Expected Uncollateralised Loss across all clearing participants over a recent period. If a participant group’s exposure exceeds 50% of the fund threshold, HKSCC collects additional Guarantee Fund Risk Collateral from the firms involved.
The Central Depository and Nominee Structure
CCASS eliminates paper handling through immobilization. Share certificates are deposited into a secure vault and converted into electronic book-entry records. HKSCC Nominees Limited, a wholly owned subsidiary of HKSCC, is the registered holder on each issuer’s books.10Hong Kong Exchanges and Clearing Limited. Admission Criteria and Operational Requirements for Becoming a Participant of HKSCC Participants and their clients keep the beneficial interest, meaning the right to dividends, sale proceeds, and economic value.
Corporate actions run through the nominee. When a company pays a dividend, funds flow to HKSCC Nominees, which distributes them electronically to participant accounts. There are currently no scrip fees for the collection and distribution of scrip dividends or bonus shares.11Hong Kong Exchanges and Clearing Limited. Clearing and Settlement – Operational Fees Beneficial owners don’t vote directly at shareholder meetings; they submit instructions through CCASS and HKSCC consolidates them. The deadline is 4:15 p.m. on the date HKSCC prescribes for each meeting.12Hong Kong Exchanges and Clearing Limited. CCASS Operational Procedures
Participants can pull holdings out as physical certificates, though the pricing discourages it. The withdrawal fee for standard registered securities is HK$3.50 per board lot (odd lots the same), plus a HK$5 transfer deed stamp duty per certificate. Bearer debt securities cost HK$100 per certificate to withdraw. Fees are debited on the day of withdrawal.
Fees Participants Actually See
For standard exchange trades, the stock settlement fee is 0.0042% of gross trade value, charged to each side. Crossed exchange trades, where the same broker sits on both sides, are charged 0.0021% per side. Settlement instruction transactions between brokers and custodians are charged 0.0020% of gross value, subject to a HK$2 minimum and HK$100 maximum per transaction.
Holding securities in the depository costs HK$0.012 per board lot for registered securities, calculated on month-end balances and capped at HK$100,000 per participant per month. Debt securities are charged 0.012% per annum on nominal values, calculated daily. Foreign securities carry a separate maintenance fee of HK$0.25 per 100 shares on daily average balances, and China Connect securities use a tiered portfolio fee starting at 0.008% per annum.
Stock Connect Runs on Different Rules
CCASS also clears Stock Connect, the cross-border program linking Hong Kong and mainland Chinese markets. China Connect Securities Trades settle share delivery on the trade date (T+0), not T+2. Cash may be confirmed on T+0 after 9:25 p.m. Hong Kong time or on T+1 morning, depending on the arrangement between the participant and its clearing bank.
HKSCC may impose additional eligibility criteria for firms wanting to register as China Connect Clearing Participants, and criteria can differ across Connect markets. One structural difference matters: all obligations and liabilities related to China Connect trades sit with the participant, not HKSCC, the Exchange, or HKEX. The novation guarantee that covers standard Hong Kong exchange trades does not extend to Connect flow in the same way.
The Move to T+1
Hong Kong is preparing to shorten its settlement cycle from T+2 to T+1. Subject to market readiness and regulatory approval, HKEX intends to make the transition in the fourth quarter of 2027. The change would cover secondary market exchange trades including equities, exchange-traded products, structured products, and debt securities, plus physical settlement from stock options. IPOs and Stock Connect northbound trading would keep their existing timelines.
HKEX has said the delivery-versus-payment framework and batch settlement structure will stay in place, and service windows for settlement instructions will be extended so participants have more time to complete post-trade processing under the compressed schedule. A public consultation on the proposal closed in May 2026. Firms currently built around a two-day processing window will need to adjust operations, particularly where reconciliation still runs manually.
A Note for US Account Holders
Americans who hold Hong Kong securities through CCASS-linked accounts face federal reporting many investors overlook.
If the aggregate value of your foreign financial accounts (including brokerage and clearing accounts held in Hong Kong) exceeds $10,000 at any point in the calendar year, you must file a Report of Foreign Bank and Financial Accounts (FBAR) by April 15 of the following year. An automatic extension to October 15 applies if you miss the initial deadline.13Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
Separately, if your specified foreign financial assets exceed $50,000 on the last day of the tax year or $75,000 at any point during the year (for unmarried taxpayers living in the US), you must file Form 8938 with your tax return. Thresholds double for joint filers and increase substantially for taxpayers living abroad, up to $600,000 at any time for married couples filing jointly from overseas.14Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets
The United States does not have an income tax treaty with Hong Kong.15Internal Revenue Service. Tax Treaty Tables There is no treaty-reduced withholding rate on dividends or other income. Hong Kong itself does not impose withholding tax on dividends paid to non-residents, so US investors generally receive Hong Kong dividends gross and owe US tax on the full amount, with no foreign tax credit available to offset it.