Stock Market Administration
This topic covers the plumbing of the Hong Kong market: how orders are matched, how volatility and disclosure are controlled, how the indices are built, how corporate actions adjust prices, and how trades clear, settle and are charged. Expect a mix of mechanism questions and small price-adjustment calculations.
Order matching and trading sessions
SEHK's automatic order-matching system executes on price-then-time priority: better-priced orders fill first, and among orders at the same price the earliest entered fills first. The trading day has a Pre-opening Session, in which orders accumulate and then execute at a single opening price calculated to maximise the quantity traded; continuous trading in a morning session and an afternoon session (with a midday break between them); and a Closing Auction Session (CAS) that sets a robust closing price by auction rather than by the last traded price, reducing manipulation at the close. A limit order trades only at a specified price or better, while a market (at-best) order prioritises speed of execution over price. Treat specific session times as edition-sensitive and confirm them against the current HKEX trading calendar.
Volatility controls and trading halts
The Volatility Control Mechanism (VCM) guards against extreme, disorderly price swings. When a potential trade in an eligible security would move the price beyond a set band from a reference price, the VCM triggers a short cooling-off period during which trading continues only within a price band, then normal trading resumes. The band is commonly around plus or minus 10% for eligible index-constituent equities and around plus or minus 5% for major index futures, with a cooling-off period of a few minutes; confirm the current percentages and timing against HKEX rules, as they are periodically calibrated. Separately, the Exchange can impose a trading halt or a longer suspension, typically to allow the market to absorb a price-sensitive announcement or because a company has failed to meet a disclosure or listing obligation, ensuring all investors trade on the same information.
Short selling and disclosure of interests
Short selling on SEHK is permitted only as covered short selling of designated securities, meaning the seller has arranged to borrow the stock before selling; naked shorting is prohibited. A tick rule prevents a short-sale order being priced below the best current ask, so shorting cannot drive the price down. Holders of significant short positions in specified shares must report them to the SFC. The disclosure-of-interests regime under Part XV of the Securities and Futures Ordinance promotes transparency of control: a person becomes a substantial shareholder once their interest reaches a threshold (commonly 5%) and must notify the SFC and the Exchange within a short deadline (a few business days), with further notifications when their percentage crosses each whole-number level up or down; directors must disclose their own interests in the company's shares. Confirm the exact threshold and deadlines against the current SFO.
Indices and their construction
The Hang Seng Index is a free-float-adjusted, market-capitalisation-weighted index: each constituent's weight reflects its market value scaled by the proportion of shares actually available to trade (the free float), rather than shares locked up with insiders. A cap (commonly around 8%) is applied to any single stock's weight so that no one company dominates the index, and the constituent list is reviewed periodically (typically quarterly). The Hang Seng China Enterprises Index (HSCEI) tracks major Mainland enterprises listed in Hong Kong, and the Hang Seng TECH Index (HSTECH) tracks the largest technology companies. Free-float adjustment matters because it makes the index better reflect the investable market and the prices at which investors can actually trade. Confirm current cap levels and review frequency against the index methodology, which is updated over time.
Corporate actions and price adjustments
Administrators must adjust for corporate actions, and the exam tests the arithmetic. A cash dividend is paid from a company's distributable profits; a special dividend is a one-off larger payment; a scrip dividend lets holders take shares instead of cash. The ex-dividend date is pivotal: a buyer on or after it does not receive the dividend, so the price is expected to drop by roughly the dividend on that date; the record date fixes who is entitled. For a bonus issue of one-for-two on a HK$12 share, every 2 shares become 3, so the theoretical price becomes 12 x 2/3 = HK$8. For a two-for-one stock split, a HK$60 share becomes HK$30; a five-into-one consolidation multiplies the price by five. For a rights issue, the theoretical ex-rights price (TERP) is the weighted average of old and new shares: with a cum-rights price of HK$10 and a one-for-four rights issue at HK$8, TERP = (4 x 10 + 1 x 8)/5 = HK$9.60, and the theoretical value of one right is TERP minus the subscription price = 9.60 - 8 = HK$1.60. A one-for-five rights issue at HK$12 on an HK$18 share gives TERP = (5 x 18 + 12)/6 = HK$17.
Clearing, settlement and transaction costs
Trades clear and settle in CCASS on a T+2 cycle in dematerialised, book-entry form, so ownership transfers electronically without paper certificates; most HK-listed shares are held through brokers' CCASS accounts, giving the investor a beneficial interest rather than direct registration. Trading is in board lots, with quantities below a board lot handled as odd lots, and the minimum tick is set by the spread table. Costs combine a government-imposed charge, stamp duty, levied ad valorem on transfers of Hong Kong stock, with market and intermediary charges: broker commission, the SFC transaction levy, the AFRC levy, the HKEX trading fee and the CCASS settlement fee. Only stamp duty is the government cost, a distinction the exam likes to test. Firms rely on internal controls such as segregation of duties, keeping dealing separate from settlement and record-keeping, so that no single person controls a whole transaction, reducing the risk of error and fraud. Treat all specific rates as edition-sensitive and verify them against current HKEX and SFC schedules.
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