Non-collateralized Nature of Structured Products


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CBBCs Guidebook

Two Ways to Calculate the Price Change in CBBC - Gearing Ratio and Conversion Ratio

The price change in CBBC is mainly influenced by two factors; one of them is the gearing ratio. The gearing ratio of CBBC means every 1% change in the underlying asset will, in theory, bring a change in the percentage of the CBBC price. The calculation is as following:

Gearing ratio of CBBC = underlying price / (CBBC price x conversion ratio)

Please note that the gearing ratio of CBBC varies and it will rise or fall according to the underlying price. Assume other factors remain constant, generally speaking, when the underlying asset price is close to the call price, the greater the gearing ratio of the CBBC will be and the chance of the CBBC being called will be higher.

The second factor is the conversion ratio. The conversion ratio of CBBC reflects its sensitivity to the price change of its underlying, which shows the change of the CBBC when the underlying changes its price. The level change in underlying asset needed for every price change in CBBC is calculated as following:

Necessary change = the lowest bid-ask spreadx conversion ratio

Take HSI CBBC as an example; suppose the conversion ratio of this CBBC is 10,000:1, its price is lower than HK$0.25, which means the smallest unit of changes is $0.001. According to the above formula, if the HSI futures index changes by 10, the relevant price of CBBC will have a $0.001 rise or drop.