How Often Is the Southbound Stocks List Adjusted? When Do Adjustments Take Effect?
Adjustments to the Southbound Stocks list fall into two categories: regular and ad hoc. Regular adjustments follow the semi-annual review of the Hang Seng Composite Index (HSCI), twice a year, with changes taking effect in March and September; ad hoc adjustments are triggered by events such as new listings, risk warnings, and delistings, and are executed at the time of the event.
1. Regular adjustments: following the HSCI semi-annual review
Data cut-off baseline: The Hang Seng Composite Index series is reviewed semi-annually, with data as of the end of June and the end of December each year serving as the baseline for market capitalization, liquidity, and other indicators.
Results announcement and index effectiveness: Hang Seng Indexes Company announces the review results within about eight weeks after the data cut-off, usually in February and August; index changes generally take effect after the close on the first Friday of March and September.
Southbound list switch: After the index changes take effect, the securities trading service companies of the Shanghai and Shenzhen Stock Exchanges update the Southbound Stocks list accordingly, with the effective time subject to their announcements, usually the next Stock Connect trading day after the index effective date.
2. Four key time nodes of the regular adjustment
Node chain: The semi-annual adjustment can be summarized in four nodes: data cut-off (June 30 and December 31) → review results announced (around February and August) → index changes take effect (after the close on the first Friday of March and September) → Southbound list switch (the next Stock Connect trading day after the effective date).
3. Ad hoc adjustments: event-triggered
Ad hoc inclusion: Newly listed H shares of A+H issuers are transferred in once the price stabilization period has ended and the corresponding A shares have been listed for ten trading days; new listings qualifying under the Hang Seng Composite Index fast-entry mechanism are transferred in upon index inclusion.
Ad hoc removal: Where a stock is delisted or enters delisting procedures, is suspended for an extended period, or the A shares of an A+H issuer are placed under risk warning or a delisting arrangement, the exchanges may remove it from Stock Connect Southbound immediately, outside the semi-annual window.
4. Timing of the small-cap market capitalization threshold
Applied only at regular reviews: The inclusion threshold for small-cap constituents — average monthly market capitalization over the twelve months preceding the review date of not less than HK$5 billion — and the removal threshold of below HK$4 billion are applied only at regular reviews of Hang Seng Composite SmallCap Index constituents, with the relevant stocks moving in or out of Stock Connect Southbound on the index regular review effective date.
5. Channels for checking the list
Official sources: The Southbound Stocks list and the transfer announcements are published by the securities trading service companies of the Shanghai and Shenzhen Stock Exchanges on their designated websites; the Hang Seng Indexes Company website concurrently publishes the index adjustment results. Together they constitute the official sources for verifying list changes.
NewTimeSpace Observation: The key to the adjustment rhythm lies in the chain of four nodes: data cut-off, results announcement, index effectiveness, and list switch. On the trading days around the March and September effective dates, passive fund rebalancing tends to create abnormal volume in the affected stocks; observing the turnover structure during this window helps distinguish list effects from fundamental changes.
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