SSE 180 Index is the stock index of Shanghai Stock Exchange, representing the top 180 companies by "float-adjusted" capitalization and other criteria.
[2] SSE 180 is a sub-index of SSE Composite Index, the latter included all shares of the exchange.
It consists of the top 20 companies[4] with a cap of 6 from each kind of industries.
[5] The subindex may intersect with SSE 50 Index.
SSE Mega-Cap started to publish in 2009.