Stocks entering the Hang Seng
Every addition to the index behind 2800.HK, EWH over the last two years: when it took effect, who it replaced, and how the stock traded 1 week, 1 month, 3 months, 6 months and 1 year after the effective close.
The register
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Losses are entered in red. A blank cell means that window hasn't elapsed yet.
How Hang Seng additions work
Hang Seng Indexes reviews quarterly, announcing results in February, May, August and November. Changes take effect on the Monday following the first Friday of March, June, September and December. A change is announced first and only takes effect after the close on the effective date. Between those two dates, every fund tracking the index (2800.HK, EWH) has to buy the incoming stock, which is why the window matters to traders.
What happens to a stock after it joins Hang Seng
Inclusion is often described as a guaranteed pop. The tracked history is more mixed: . Returns are measured from the effective close and can also be viewed against the index itself, so a rising market doesn't get counted as an inclusion effect.
When are Hang Seng changes announced?
Quarterly review (Feb / May / Aug / Nov). Scheduled review, announcement and effective dates for the next twelve months are listed on the index review calendar. Ad hoc changes — a takeover, a bankruptcy, a fast-track promotion — are announced outside that schedule, usually with a few days' notice.