Averaging Down on a Bull CBBC Four Per Cent from the Call Price
Mr Ng, 38, has traded for two years and holds a margin account with your firm with HK$680,000 of equity, including his existing CBBC position. In February he bought 500,000 units of a bull CBBC issued by an affiliate of your firm over stock X. Terms: call price HK$58.00, strike HK$56.00, expiry in four months, entitlement ratio 10 units per share, cash-settled. Stock X is now HK$60.50 after a volatile results season; the CBBC trades at HK$0.46.
Mr Ng calls: 'It's cheap now. I want another 500,000 units, use 60% margin, that's about HK$230,000.' He adds that his April bonus depends on his trading book and he 'cannot take a loss this quarter'.
Your firm's structured products desk circulated an internal 'buy' note on the same CBBC yesterday, and your incentive scheme pays a higher rate on CBBC turnover than on listed shares. The liquidity provider for the CBBC is your firm's affiliate.
1. Explain how the mandatory call mechanism works and what Mr Ng would receive if stock X touches HK$58.00.
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How the mandatory call works.
- A bull CBBC has a call price above its strike. Here the call price is HK$58.00, the strike HK$56.00 and the spot HK$60.50 - only about 4.1% away.
- If stock X touches HK$58.00 at any time during a trading session - intraday, on a single trade - a mandatory call event occurs. There is no averaging, no grace period and no discretion.
- Trading in the CBBC stops and the contract enters a call period. Whether the call period runs to expiry or ends at the close of that session, and how the residual value is calculated, depends on the category of the contract and the listing document. You must be able to explain the specific terms before he trades.
- The key point for him: with the call price only HK$2.00 above the strike, a further fall of roughly 3.4% from the call level takes the underlying below HK$56.00, and the residual value is then zero. He loses the whole premium, not just the distance to the call price.
- At HK$0.46 against intrinsic value of (60.50 − 56.00) ÷ 10 = HK$0.45, almost the entire price is intrinsic value. There is little time value to lose, but also almost no cushion: a 4% move in the share ends the position.
- 'Averaging down' does not work as it does in shares. When a CBBC is called, the position is terminated. Buying more at HK$0.46 does not lower his break-even; it doubles the amount that goes to zero if the call is triggered. The risk is path-dependent - one bad intraday print ends it, even if the stock recovers the next day.
2. Assess the suitability and margin implications of doubling the position.
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- Exposure. He holds 500,000 units. Buying 500,000 more at HK$0.46 costs HK$230,000 and, at 10 units per share, doubles his exposure to 100,000 shares - about HK$6.05m of stock X at HK$60.50 - against account equity of HK$680,000. That is roughly nine times leverage.
- Margin. At 60% margin he borrows about HK$138,000 for the new units. A fall towards the call price shrinks the value of the collateral at the same time as the margin requirement bites, producing a margin call precisely when the position is most fragile. He may be forced to sell at the worst point.
- Suitability. Two years' trading, a HK$680,000 account, and a leveraged knock-out product 4% from termination is not a match. His stated constraint - 'I cannot take a loss this quarter' - is itself a red flag: it indicates a need for capital preservation and a temptation to hold a losing position too long, which is fatal with a knock-out.
- Concentration. After the trade, essentially his whole account is one directional bet on one stock.
- Conclusion. Do not present the second purchase as a recovery strategy. If he insists, it must be handled as an unsolicited instruction after a documented risk explanation, with the margin implications and a worst-case scenario shown in dollars: the entire HK$460,000 could be lost on a 4% fall in the underlying. Consider whether the firm should reduce or refuse the margin.
3. Identify the conflicts of interest in this situation and explain how they must be managed.
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Three conflicts sit on top of each other.
- Issuer and liquidity provider. The CBBC is issued, and liquidity-provided, by an affiliate of your firm. The firm profits from issuance volume and from hedging, and the liquidity provider's quote is the market your client trades against. Disclose the affiliation and the liquidity provider role in writing; do not present the provider's quote as independent.
- The desk note. The structured products desk's 'buy' note is a proprietary view, not client advice. Passing it on as a recommendation without analysing whether it suits this client is a suitability failure waiting to happen. If the note is used at all, identify whose view it is and treat it as one input among several.
- Remuneration. A higher payout on CBBC turnover than on shares rewards exactly the behaviour in this call - doubling a leveraged position. That must be disclosed under the firm's conflicts policy, and supervision should test whether CBBC turnover in client accounts is being driven by incentive rather than suitability.
Practical steps: disclose the issuer and liquidity provider affiliation and the incentive structure; explain the mandatory call mechanism with numbers; document the suitability assessment and the client's instructions; escalate the margin decision; retain the call recording and the desk note; and ask Compliance to review the branch's CBBC turnover pattern if this is not an isolated case.