from ENN:"[...] Standard & Poors, which manages indices for the...

from ENN:

"[...] Standard & Poors, which manages indices for the ASX, has promoted Beach Energy to the elite ranks of the S&P/ASX100 and added another six oil and gas companies to the S&P/ASX300 – Buru, Drillsearch, Neon, Senex, Texon and Red Fork.

Entry to an index is determined by a slightly complicated formula that measures a weighted average of market capitalisation over the previous six months and liquidity. [...]"