S&P took this over in June 2015
Details of their methods:
http://www.spindices.com/indices/equity/sp-nzx-50-index
Rough and partial summary:
Free float
Any escrowed shares or holdings over 20% are excluded.
Holdings of 5-20% are treated case-by-case with founder and 'insider' shareholdings usually excluded.
Dual listed shares - free float is adjusted by multiplying by the % of turnover that is from NZ
Overseas listed shares - free float is adjusted by the % of shares listed in NZ
Calculation of MCAP for NZ50 purposes
= free float * average share price over the past 6 months
Change timetable
Changes are effective from third Friday of Mar Jun Sep Dec;
Announced Friday before changed;
Reference date last day of month prior.
Buffer zone - positions 45-55
To bust in, a share must be ranked 44 or above
To be kicked out, it must rank 56 or lower
As it happens there's a big gap between #44 and 45 so it's hard to break in.
Danger zone copied below - free float MCAP for current share price and average past 6 months shown.
Looks like KMD will go next review, and OGC in.
I'm not sure how KMD survived the last review - I've made an assumption that they are overseas listed, not dual listed, and have guessed their NZ shares by comparing volume traded on NZX and ASX.
Come June next year - possibly MPG out and ARV (whose share come out of escrow) or others could come in.
Figures likely to contain errors and omissions - pls let me know if you see any. They did predict PEB out / NZR in last time.
Haven't included the new insurance company listing as the free float last I checked was low.
Shares in red are not in the index.
Attachment 7670
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