Futu Securities cost price algorithm, which one is the default for Hong Kong brokers and domestic brokers?
Regarding this problem/issue from Futu, I will state the conclusion first.
Futu Securities currently defaults to displaying cost-averaging, which is not what many people understand as simply calculating an average based only on buys and ignoring sells. Extending this concept further, Hong Kong brokers do not have a unified default methodology. If it is a holdings page aimed at Chinese retail investors, common display methods include cost-averaging, average cost, and breakeven price (or principal protection price). However, if the broker is an international firm like IBKR that places more emphasis on tax lots and statement consistency, FIFO (First-In, First-Out) is generally the default method.
When discussing domestic brokerage firms, if we refer to the most common field in A-share trading clients—the “Cost Price/Holding Cost Price”—it is more commonly focused on the diluted cost basis or break-even price, rather than simply the average purchase price. This is just because different brokerages do not have standardized naming conventions; some call it “holding cost,” others call it “diluted cost,” and some provide a separate figure for the “average purchase price.”